FCC ID: 2AJYU-8XRA002 LTE Wireless Data Module

SIM8918EASIM8918NA User Manual LTE Wireless Data Module SIMCom Wireless Solutions Limited SIMCom Headquarters Building, Building 3, No. 289 Linhong Road, Changning District, Shanghai P.R. China Tel: 86-21-31575100 support@simcom.com www.simcom.com SIM8918EA_SIM8918NA_User Manual GENERAL NOTES SIMCOM OFFERS THIS INFORMATION AS A SERVICE TO ITS CUSTOMERS, TO SUPPORT APPLICATION AND ENGINEERING EFFORTS THAT USE THE PRODUCTS DESIGNED BY SIMCOM. THE INFORMATION PROVIDED IS BASED UPON REQUIREMENTS SPECIFICALLY PROVIDED TO SIMCOM BY THE CUSTOMERS. SIMCOM HAS NOT UNDERTAKEN ANY INDEPENDENT SEARCH FOR ADDITIONAL RELEVANT INFORMATION, INCLUDING ANY INFORMATION THAT MAY BE IN THE CUSTOMERS POSSESSION. FURTHERMORE, SYSTEM VALIDATION OF THIS PRODUCT DESIGNED BY SIMCOM WITHIN A LARGER ELECTRONIC SYSTEM REMAINS THE RESPONSIBILITY OF THE CUSTOMER OR THE CUSTOMERS SYSTEM INTEGRATOR. ALL SPECIFICATIONS SUPPLIED HEREIN ARE SUBJECT TO CHANGE. COPYRIGHT THIS DOCUMENT CONTAINS PROPRIETARY TECHNICAL INFORMATION WHICH IS THE PROPERTY OF SIMCOM WIRELESS SOLUTIONS LIMITED COPYING, TO OTHERS AND USING THIS DOCUMENT, ARE FORBIDDEN WITHOUT EXPRESS AUTHORITY BY SIMCOM. OFFENDERS ARE LIABLE TO THE PAYMENT OF INDEMNIFICATIONS. ALL RIGHTS RESERVED BY SIMCOM IN THE PROPRIETARY TECHNICAL INFORMATION INCLUDING BUT NOT LIMITED TO REGISTRATION GRANTING OF A PATENT , A UTILITY MODEL OR DESIGN. ALL SPECIFICATION SUPPLIED HEREIN ARE SUBJECT TO CHANGE WITHOUT NOTICE AT ANY TIME. SIMCom Wireless Solutions Limited SIMCom Headquarters Building, Building 3, No. 289 Linhong Road, Changning District, Shanghai P.R. China Tel: +86 21 31575100 Email: simcom@simcom.com For more information, please visit:

https://www.simcom.com/module/smart_modules.html For technical support, or to report documentation errors, please visit:

https://www.simcom.com/ask/ or email to: support@simcom.com Copyright 2021 SIMCom Wireless Solutions Limited All Rights Reserved. www.simcom.com 2 / 53 SIM8918EA_SIM8918NA_User Manual 1 Introduction 1.1 Product Outline SIM8918x series module is a 4G Android smart module developing by the platform of Qualcomm QCM2290 a 64-bit applications processor with Arm Cortex-A53 quad-cores at 2.0GHz with 512KB L2 cache. SIM8918x series module has abundant multi-media functions, including the 1080P@30 fps video codec, the HD+ 720*1680@60Hz displaying screen, two MIPI-CSI cameras, and the multi-channel analog-

and digital-audio input and output. SIM8918x series module supports multiple communication modes, including the GSM/GPRS/EDGE, the WCDMA/HSPA+, the LTE-FDD, and the LTE-TDD. It also supports the WiFi 802.11 a/b/g/n/ac, and the BT4.x short range communication. For the satellite positioning system, SIM8918x series module supports the GPS, the GLONASS, the BEIDOU, and the Galileo. In conclusion, SIM8918x series module is a highly integrated product, which is widely applying to intelligent terminal devices in the field of the Internet of Things (IOT). Model Name: SIM8918EA,SIM8918E Product Name: LTE Wireless Data Module Brand name: SIMCom 1.2 Functional Overview Feature Processor Description 64-bit Arm Cortex-A53 Quad-cores at 2.0GHz with 512KB L2 cache 1804MHz clock 2*16-bitBUS LPDDR4x SDRAM design Built-in eMMC 5.1 Flash, Memory 16GB eMMC + 2GB LPDDR4x Or 32GB eMMC+3GB LPDDR4x (option) Or 8GB eMMC + 1GB LPDDR3

(option) SD SDC2 external interface supports SD3.0 TF card (Maximum 256G), support hot plug detection Operation System Support Android 12/13 System Upgrade Upgrade via USB interface, support forced download Power Supply Power Domain: 3.4V~4.4V, support single-cell lithium battery power supply. Charge Display Camera Internal charger, supports high charging current up to 1.8A One 4-Lane MIPI_DSI interface, the highest resolution is 720*1680, HD+. Two CSI MIPI configurable 4/4 or 4/2/1 D-PHY2.5 Gbps /channel www.simcom.com 3 / 53 SIM8918EA_SIM8918NA_User Manual C-PHY~10 Gbps3.42 Gbps/channel Single ISP: 13 MP 30 ZSL; dual ISP: 25 MP 30 ZSL Real time sensor input resolution: 25MP or 13MP+13MP Video Codec Encode: 1080p30 8-bit HEVC(H.265),H.264 Decode: 1080p30 8-bit H.264, HEVC(H.265),VP9 Concurrency: 1080p30 decode + 720p 30 encode Audio 1-Channel Digital Audio Interface I2S: Support Master- and Salve-Mode 3-Channel Analog Audio Input Master Microphone MIC1: Differential Input Headphone Microphone MIC2: Single-end Input De-noise Microphone MIC3: Differential Input 4-Channel Digital Microphone Input 3-Channel Analog Audio Output Headphone: Class AB Amplifier Stereo Output Receiver: Class AB Amplifier Differential Output Lineout: Class AB Amplifier Differential Output Audio Codec MP3, AAC, He-AAC v1, v2, FLAC,APE, ALAC, AIFF Voice Codec EVS, EVRC, EVRC-B, and EVRC-WB G.711 and G.729A/AB GSM-FR, GSM-EFR, and GSM-HR AMR-NB and AMR-WB USB UART I2C SPI Support USB 3.1, support USB2.0 Support USB Type-C Interface Support OTG USB_VBUS OTG Mode 5V Power Output (500mA Typical) Support up to 3 Serial Ports A 2-Wire Serial Port for Debug Two 4-Wrie Serial Ports support hardware flow control, High-speed up to 4Mbps. Support up to seven I2C for touch screen, camera, sensor and other peripherals Support up to 2*SPI interfaces, support master mode, the highest rate 50MHz UIM Card Support Dual Card Dual Standby: 1.8V/3.0V Dual Voltage Class 4 (33dBm2dB) for EGSM850 Class 4 (33dBm2dB) for EGSM900 Class 1 (30dBm2dB) for DCS1800 Class 1 (30dBm2dB) for PCS1900 Class E2 (27dBm3dB) for EGSM850 8-PSK Power Level Class E2 (27dBm3dB) for EGSM900 8-PSK Class E2 (26dBm3dB) for DCS1800 8-PSK Class E2 (26dBm3dB) for PCS1900 8-PSK Class 3 (24dBm+1/-3dB) for WCDMA bands Class 3 (23dBm2dB) for LTE-FDD bands Class 3 (23dBm2dB) for LTE-TDD bands www.simcom.com 4 / 53 SIM8918EA_SIM8918NA_User Manual LTE Features UMTS Features GSM Features WLAN Features Support 3GPP R10 CAT4 FDD and TDD Support 1.4 to 20 MHz RF Bandwidth Support Downstream 2x2 MIMO FDD: the maximum 150Mbps(DL) / the maximum 50Mbps(UL) TDD: the maximum 150Mbps(DL) / the maximum 35Mbps(UL) Support 3GPP R8 DC-HSDPA/HSPA+/HSDPA/HSUPA/WCDMA Support 16-QAM, 64-QAM and QPSK modulation DC-HSDPA: maximum 42Mbps(DL) HSUPA: maximum 5.76Mbps(UL) WCDMA: maximum 384Kbps(DL) / maximum 384bps(UL) R99:

CSD: 9.6Kbps, 14.4Kbps GPRS: Support GPRS Multi-Slot Level 33(Default 33) Coding format: CS-1, CS-2, CS-3, and CS-4 Maximum 85.6Kbps(UL) / Maximum 107Kbps(DL) EDGE: Support EDGE Multi-Slot Level 33(Default 33) Support GMSK and 8-PSK modulation and coding Methods Downlink Coding Format: CS 1-4 and MCS 1-9 Uplink Coding Format: CS 1-4 and MCS 1-9 The maximum 236.8Kbps(UL) / The maximum 296Kbps(DL) 2.4G/5G Dual Frequency Range, Support 802.11a/b/g/n/ac, Maximum 433Mbps Support the Wake-on-WLAN. Support the WAPI SMS4 hardware encryption. Support the AP mode and the STATION mode. Support the WIFI Direct. Support the 2.4G MCS 0~8 for HT20 and VHT20. Support the 2.4G MCS 0~7 for HT40 and VHT40. Support the 5G MCS 0~7 for HT20, HT40 Support the 5G MCS 0~8 for VHT20. Support the 5G MCS 0~9 for VHT40 and VHT80. BT Features BT2.1+EDR /3.0 /4.2 LE/5.x Satellite Positioning Temperature GPS /GLONASS /BEIDOU/Galileo Operation Temperature: -35~ +75 Extend Operation Temperature: -40 ~ +851 Storage Temperature: -40~ +90 Physical Size Size: 40.5(0.2)*40.5(0.2)*2.85(0.2)mm www.simcom.com 5 / 53 SIM8918EA_SIM8918NA_User Manual 2 Package Information 2.1 Hardware Block Diagram 720*1680 LCD REAL Cam(25MP) Front Cam(25MP) Type-C USB UIM Card1 UIM Card2 SD Card TP/Sensor/others VPH_PWR VRTC Poweron singals GPIO Haptics output USB_IN VPH_PWR Battery GPIOs Flash output Charge LED Analog Micphone Earphone Headset LINEOUT 4-Lane DSI0 4-Lane CSI0 4-Lane CSI1 USB HS/USB_SS0+SS1 UIM1 UIM2 SDC2 I2C/I3C/SPI/UART GPIOs LC_networks Input/Output Power Management 4 SMPS output LC_networks 24 VREG output Analog inputs Clocks IC-level interface SPMI BUS User interfaces 38.4M XO General houseke eping Charger Pon singals IC-level interface User inter faces Audio Codec AP 64-bit Arm Cortex-

A53 Camera ISP/

VFE/Jpeg HW Display Processor Video Graphics Peripherals RFFE1 RFFE2 Front End MAIN Tx Module Modem 4G/3G/2G MODEM Core MODEM/Voice Processor GNSS Baseband TX_DAC I/Q PRX_CA1 I/Q DRX_CA1 I/Q GPS_ADC I/Q RFFE5 Transceiver PA Switch DRX LNA GNSS Baseband BT/WIFI Baseband WLAN RX I/Q WLAN TX I/Q WLAN CNTRL clk/data WLAN-BT coex clk/data SSC data 2-wire BT control/data 4-wire BT audio clk/data WLAN_CLK 38.4M BT/WiFi RF_CLK 38.4M Sleep_CLK 32K WCN 38.4M XO Codec Digital Memory Support EBI0/EBI1 SDC1 eMMC flash +

LPDDR4x Figure 1: Module Block Diagram www.simcom.com 6 / 53 SIM8918EA_SIM8918NA_User Manual 2.2 Pin Assignment Overview S U B V _ B S U S U B V _ B S U T E D _ S H L _ H P H D N G D N G _ H P H R _ H P H D N G M R E H T _ T A B P _ T A B D N G X R D _ T N A D N G 8 V 2 _ D D V C D A I 8 _ O P G _ M P C T R V D D V O I _ O D L I 3 _ O P G _ M P S S N G _ T N A 0 6 _ O P G I D N G 5 1 _ O P G I 4 1 _ O P G I 7 1 _ O P G I 6 1 _ O P G I D N G I 4 _ O P G _ M P N _ Y E K _ R W P 8 5 _ O P G I 7 5 _ O P G I T A B V T A B V D N G D N G 6 4 1 5 4 1 4 4 1 3 4 1 2 4 1 1 4 1 0 4 1 9 3 1 8 3 1 7 3 1 6 3 1 5 3 1 4 3 1 3 3 1 2 3 1 1 3 1 0 3 1 9 2 1 8 2 1 7 2 1 6 2 1 5 2 1 4 2 1 3 2 1 2 2 1 1 2 1 0 2 1 9 1 1 8 1 1 7 1 1

6 1 1 5 1 1 4 1 1 3 1 1 2 1 1 8 V 1 _ A 5 1 _ G E R V 1 1 1 186 185 184 CBL_PWR_N BAT_ID VPH_PWR 182 *

181 180 179 178 177 *

GPIO_86 NFC_CLK FLASH_LED RESERVED RESERVED GPIO_112 147 MIC_BIAS1 187 GND 222 GND 217 GND 216 GND 215 GND 214 GND 176 GND 183 BAT_M 220 GND 249 USB_CC1 270 USB_SS1_ RX_M 271 GND 272 GND 273 GND 274 GND 221 GND 250 GND 251 GND 253 USB_SS1 _TX_M 254 USB_SS1_ TX_P 255 GND 256 GND 231 GND 219 GND 248 GND 269 GND 282 GND 283 GND 218 GND 247 GND 268 GND 281 GND 286 GND SIM8918 284 GND 275 GND 285 GND 276 GND 259 GND 246 USB_CC2 267 GPIO_111 280 GND 279 GND 278 GND 277 GND 260 GRFC_14 257 RESERVED 258 GND 232 RESERVED 233 GND 234 GND 235 GND 223 GND 224 GND 188 GND 189 GND 190 GND 225 RESET_N 252 USB_SS1_ RX_P 191 GND 226 GND 152 192 USB_SS2_ RX_P USB_SS2_RX _M 153 *

193 UART1_RXD RESERVED 154 *

UART1_TXD 194 GNSS_L NA_EN 227 GND 228 GND 229 GND 155 195 MIC_BIAS3 CHG_LED 230 GND 156 196 197 198 199 200 201 PM_GPIO_7 202 GND VREG_17A_3V0 CSI0_CLK_P CSI0_LN0_P CSI0_LN1_P CSI0_LN2_P CSI0_LN3_P VBAT 1 VBAT 2 GND 3 MIC1_P 4 MIC1_N 5 MIC2_P 6 GND 7 8 9 10 EAR_P EAR_N LINEOUT_P LINEOUT_M GND USB_DM USB_DP GND 11 12 13 14 RESERVED USIM2_DET USIM2_RST USIM2_CLK USIM2_DATA USIM2_VDD USIM1_DET USIM1_RST 15 16 17 *

18 19 20 *

21 22 *

USIM1_CLK 23 USIM1_DATA 24 USIM1_VDD 25 26 GND VIB_DRV_P PWM 27 28 TP_INT_N TP_RST_N 29 SD_LDO4 30 *

GPIO_28 31 UART0_TXD 32 UART0_RXD 33 *

UART0_CTS 34 UART0_RTS 35 *

36 *

37 148 MIC3_P 149 MIC3_N 150 USB_SS2_ TX_P 151 USB_SS2_ TX_M 8 3 D D V _ D S SDC2 USB UART USIM AUDIO GPIO Antenna TP LCM Camera Others RESERVED POWER GND GPIO_36

*110 109 GPIO_34

GPIO_33

108 GPIO_35

*107 GPIO_56 106 GPIO_99

*105

*104 GPIO_102

*103 GPIO_103 102 GPIO_105

101 GPIO_104

100

* 99

* 98

* 97 VOL_DOWN GPIO_107 GPIO_31 GPIO_55 GPIO_32 96

* 95 94

* 93

* 92 91 VOL_UP DEBUG_TXD DEBUG_RXD SENSOR_I2C_SDA SENSOR_I2C_SCL GPIO_106 GND

* 90 89 88 87 GND ANT_MAIN GND GND 86 CAM1_RST CAM0_PWDN CAM0_RST GND CAM0_I2C_SDA 85 CAM0_I2C_SCL 84 CAM1_PWDN 83 82

* 81

* 80

* 79 78 77 CAM_MCLK1 76 CAM_MCLK0 75 ANT-WIFI/BT GND 245 GND 266 GND 244 GND 243 GND 213 GND 212 GND 175 RESERVED 174 RESERVED 265 GPIO_98 242 RESERVED 211 GND 173 GRFC_13 264 GPIO_100 241 GND 210 GND 172 GND 263 RESERVED 240 GND 262 GRFC_15 239 *

GPIO_101 261 GND 236 GND 203 GND 238 GND 237 GND 204 GND 171 GND 170 LPI_GPIO_ 26 169 LPI_GPIO_ 25 168 SNSR_ I3C_SCL 167 SNSR_ I3C_SDA 209 GND 208 GND 207 GND 206 GND 205 CAM1_I2 C_SDA 166 CAM1_I2 9 C_SCL 6 0 7 157 158 159 160 161 9 3 0 4 CSI0_CLK_N 2 4 1 4 3 4 CSI0_LN0_N 5 4 4 4 6 4 CSI0_LN1_N 8 4 7 4 9 4 CSI0_LN2_N 0 5 1 5 2 5 CSI0_LN3_N 3 5 4 5 162 GND 7 5 8 5 5 5 6 5 163 164 *

165 *

CAM2_PWDN 0 6 1 6 9 5 2 6 CAM2_RST 3 6 4 6 5 6 CAM_ 6 MCLK2 6 7 6 8 6 1 7 2 7 3 7 74 K L C _ D S D M C _ D S 0 A T A D _ D S 1 A T A D _ D S 2 A T A D _ D S 3 A T A D _ D S T E D _ D S

T O O B _ B S U L C S _ C 2 I _ P T

T S R _ D C L A D S _ C 2 I _ P T

D N G E T _ D C L N _ K L C _ I S D P _ K L C _ I S D N _ 0 N L _ I S D P _ 0 N L _ I S D N _ 1 N L _ I S D P _ 1 N L _ I S D N _ 2 N L _ I S D P _ 2 N L _ I S D N _ 3 N L _ I S D P _ 3 N L _ I S D D N G D N G N _ K L C _ 1 I S C P _ K L C _ 1 I S C N _ 0 N L _ 1 I S C P _ 0 N L _ 1 I S C N _ 1 N L _ 1 I S C P _ 1 N L _ 1 I S C N _ 3 N L _ 1 I S C P _ 3 N L _ 1 I S C N _ 2 N L _ 1 I S C P _ 2 N L _ 1 I S C Note: GPIOs with * can be used to wake up the module. Figure 2: Pin Assignment Overview www.simcom.com 7 / 53 SIM8918EA_SIM8918NA_User Manual 2.3 Top- and Bottom-View of the Module Figure 3: View of the Module www.simcom.com 8 / 53 SIM8918EA_SIM8918NA_User Manual 2.4 Mechanical Dimensional Size Figure 4: Three-Dimensional Size (Unit: mm) www.simcom.com 9 / 53 SIM8918EA_SIM8918NA_User Manual 3 Interface Applications 3.1 Power Supply The SIM8918x module operating power (VBAT) is 3.4V to 4.4V, and the typical voltage is 3.9V. The instantaneous peak current of the SIM8918x module could reach 3A. So, to enable the module is running smoothly, the power supply should be able to provide the peak current up to 3A. If the power supply is designed improperly, there would be a large voltage drop on the VBAT. The shutdown voltage of the SIM8918x module is 3.2V. If the voltage drop on the VBAT is lower than 3.2V, the module would power off. 3.1.1 Pin Overview SIM8918x series module supports a single lithium battery power supply (4.2V or 4.35V battery cell). It also supports the other types of batteries. But the maximum voltage could not exceed the maximum allowance voltage of the module. Otherwise, the module would be burned. In terms of the non-battery power supply applications, the module would power by an LDO when the DC input is up to 5V. The reference design is showing in Figure 3. DC INPUT C101+ C102 100uF 1uF U101 MIC29302 2 1 Vin On/Off 4 Vout FB 5 D N G 3 PWR_CTRL VBAT

C103 330uF C104 100nF R103 470R R101 100K R102 43K Figure 5: LDO Power Supply Reference Design Highly recommend selecting a relative high efficiency switching power supply for hardware design when the difference between the input (DC Input) and the output (VBAT) is too large. www.simcom.com 10 / 53 U101 LM2596-ADJ 2 Vout Vin 1 C101 +C102 100uF 1uF 5 4 FB On/Off D N G 3 PWR_CTRL SIM8918EA_SIM8918NA_User Manual L101 FB101 VBAT 100uH D102 C103 +

330uF MBR360 C104 100nF 270R@100MHz R101 2.2K R102 1K Figure 6: DC-DC Power Supply Reference Design DC INPUT NOTE 1. Highly recommend disconnect the VBAT power supply to power off the module when the module is running abnormally. After that, restart the module by powering. 2. The module supports the charging function. There is a need to turn off the charging function in the software patch when the customers are using the power supply without the charging function. Or connect Schottky diodes in series on the VBAT channel to prevent the current anti-flowing into the chip. 3.1.2 Power Supply Stability Design Highly recommend place bypass capacitors and voltage stabilizing components near the VBAT Pin to enhance the stability of the power supply. The reference design is showing in the Figure 5. VBAT SIM8918x Module GND C105 C104 C103 C102 C101 10pF 33pF 10uF 100uF 100uF D101 5V 1600W VBAT Figure 7: DC-DC Power Supply Reference Design C101 and C102 are two Low-ESR 100uF tantalum capacitors. C103 is a 1uF to 10uF ceramic capacitor. The function of C104 and C105 is to decrease the high frequency interference. D101 is a 5V/1600W transient voltage suppression diode, preventing the chip from being damaged by surge. For PCB wiring, the capacitors and the diodes should be close to the VBAT Pin as far as possible, and the VBAT wiring should www.simcom.com 11 / 53 be as short as possible with the width at least 3mm. SIM8918EA_SIM8918NA_User Manual Vendor PRISEMI PRISEMI 1 2 Manufacture Number Power(Watts) PTVSHC3N4V5B PTVSHC2EN5VU 2800W 1600W Package DFN2020-3L DFN1610-2L 3.2 Power On & Power Off The on-off of the SIM8918x series module has two status, including the normal on-off and the abnormal on

-off. In terms of the high- and low-pressure, and the high- and low-temperature, it should be working within the maximum power domain when running the module. Otherwise, exceeding the absolute maximumpower domain would cause permanent damage to the module. 3.2.1 Power On PWR_KEY_N (114 Pin) defines as the boot-up key when the VBAT is powering on, and triggering PWR_KEY_N with at least 2s low-level pulse starts the module. KPD_PWR_N Pin has internal pull-up, and the typical high-level voltage is 1.2V. The reference design is showing as below. PWR_KEY_N 1K 1.8V R PMU SIM8918x Module Figure 8: Power On/Off Design with a Key www.simcom.com 12 / 53 SIM8918EA_SIM8918NA_User Manual 1.8V R 1K PWR_KEY_N 4.7K Pulse 47K SIM8918x module PMU Figure 9: Power On/Off Design with an OC Gate Highly recommend the customers consider the PWR_KEY_N Pins electrical characteristics when designing. The electrical characteristics are showing in following Parameters Description Minimum Typical Maximum Unit VIH VIL High-Level Input Voltage Low-Level Input Voltage 0.8

0.6 V V 3.2.2 Power On Sequence Figure shows the power on sequence of the module. VBAT PWR_KEY_N VREG_L15A_1P8 VREG_L17A_3P0 LDO_2V8 LDO_IOVDD T>50ms t>2s 128ms SW control SW control Figure 10: Power On/Off Design with an OC Gate www.simcom.com 13 / 53 SIM8918EA_SIM8918NA_User Manual NOTE Highly recommend pulling down the PWR_KEY_N Pin when booting up the VBAT voltage at 3.8V stabilizing for at least 50ms. Do not pull down the PWR_KEY_N Pin all the time. 3.2.3 Power Off Pull down the PWR_KEY_N Pin with at least 1s to power off the module. There is a pop up prompt window confirming the action of shutting down the device when the module detects the control instructions. Apart from that, pulling down the PWR_KEY_N Pin with over 8s would be forced to restart the module. Powering on and powering off are using the same pin, and they have the same reference design. NOTE 1. The hardware design should cove the function of powering off the module. It is forbidden to run the module when powering off or restarting. Forced powering off the module adopts only when the module is running abnormally. 2. Highly recommend adding a low-cost MCU to control the PWR_KEY_N. Not only for the normal powering on and powering off but also for the watchdog function to protect the operation system. 3. Do not cut off the VBAT power supply directly when the module is running smoothly. It is to protect the internal flash memory. 4. Highly recommend to power off the module by the PWR_KEY_N Pin or the AT command before disconnecting the VBAT power supply. 3.3 VRTC The VRTC is a standby power supply, connecting with a button battery or a large capacitor. VRTC would help to maintain the RTC timing when the VBAT is powering off. VRTC would also work as charging the button battery or a large capacitor when the VBAT is powering on. If the RTC fails, the RTC clock could be synchronized by connecting the data when the module is powering on. Please refer to the Table 10 for VRTC characteristics. The input power domain for the VRTC voltage supply is 2.0V to 3.25V. The typical voltage is 3.0V. www.simcom.com 14 / 53 SIM8918EA_SIM8918NA_User Manual The average current consumption is 10uA when disconnecting the VBAT and connecting the RTC only. When powering on via the VBAT, the RTC working error is 50ppm. Switching the power supply mode of the VRTC Pin cause the RTC working error is 200ppm. Highly recommend the ESR of the button battery is less than 2K when connecting an external rechargeable button battery. Highly recommend to pick SEIKOs MS621FE FL11E. Highly recommend the ESR of the capacitor is 100uF when connecting an external large capacitor. The reference designs for VRTC are showing below. External Capacitor Power Supply for RTC VRTC Module RTC Circuit Large Capacitor Figure 11: External Capacitor Power Supply for RTC Non Rechargeable Battery Power Supply for RTC VRTC Module RTC Circuit Non Rechargeable Battery Figure 12: Non Rechargeable Battery Power Supply for RTC www.simcom.com 15 / 53 SIM8918EA_SIM8918NA_User Manual Rechargeable Battery Power Supply for RTC VRTC Module RTC Circuit Rechargeable Battery Figure 13: Rechargeable Battery Power Supply for RTC The typical voltage of the VRTC is 3.0V. And the average current consumption is 20uA when disconnecting the VBAT and connecting the RTC only. The VRTC characteristics are showing in Table 13. Parameters Description VRTC-IN VRTC Input Voltage Minimum Typical 2.0 3.0 Maximum Unit 3.25 V T- series resistance Standby Battery connecting in series resistor VRTC Current Consumption VBAT=0V IRTC-IN Accuracy Power ON Power ON Power OFF Power offVBAT on Power onVBAT=0 800

10

2000

24 50 200 uA ppm ppm ppm NOTE 1 If the VBAT is connecting an external non-removable rechargeable battery, float the VRTC Pin. Also, the software should be modified to turn off the VRTC charging instructions. 2 If the VBAT can be turn off and external Coin-cell battery doesnt useit is recommended that a minimal 47uF capacitor add on VRTC pin. www.simcom.com 16 / 53 3.4 Power Output SIM8918EA_SIM8918NA_User Manual SIM8918x series module has 18 power outputs in total, which are suitable for a wide range of external interfaces and peripherals. Highly recommend a capacitor of 33pF and a capacitor of 10pF parallel connection to the ground, which could prevent high-frequency interference effectively. Power Name PIN Num Output Voltage (V) Rated Current (mA) Default On Description VPH_PWR 184 3.4~4.4 2000 ON VREG_L15A_1P8 111 1.8 USIM1_VDD USIM2_VDD SD_LDO4 SD_VDD 26 21 32 38 VREG_L17A_3P0 129 1.8/2.95 1.8/2.95 3.0 3.0 3.0 LDO_IOVDD 125 1.8 VDD_2V8 MIC_BIAS1 MIC_BIAS3 129 147 155 2.8 1.6-2.85V 1.8 300 150 150 22 800 200 300 300 6 6 ON Off Off Off Off Off ON ON Off Off Generated by either the charger or the battery External Power and External GPIO pull up and the 1.8V power level conversion SIM Card1 Power SIM Card2 Power SD Card pull-up Power SD Card Power Power for sensor LCM DVDD or camera IOVDD Camera AVDD Microphone Bias Microphone Bias 3.5 Charging and Battery Management SIM8918x series module supports high charging current up to 1.8 A (100 mA step size).Supports trickle chargepre-chargeconstant current chargingand constant voltage charging. The module integrates the internal charging temperature rising control function. Decreasing the charging voltage and the charging current happens automatically when the temperature is too high. SIM8918x series module could charge the battery. It supports several charging modes, including the trickle charging mode, the pre-charging mode, the constant current charging mode, and the other charging modes. The Trickle Charging Mode:

The system is running into the trickle charging mode when the voltage of the battery is lower than www.simcom.com 17 / 53 SIM8918EA_SIM8918NA_User Manual 2.1V. In this case, a charging current of 100mA (typical) is applied. The Pre-charging Mode:

The system is running into the pre-charging mode when the voltage of the battery is between 2.1V and 3.0V (The cut-off voltage is programmable between 2.4V and 3.0V, Default 3.0V). The charging current is about 300mA (The current is programmable between 100mA and 450mA, Default 300mA). The Constant Current Charging Mode:

The system is running into the constant current charging mode when the voltage of the battery is between the cut-off voltage of the pre-charging mode and 4.2V (The voltage is programmable between 3.6V and 4.2V, Default 4.2V). The charging current is programmable between 0mA and 1800mA (The Default USB charging current is setting at 500mA in the software configuration). The Constant Voltage Charging Mode:

The system is running into the constant voltage charging mode when the voltage of the battery is reaching at the predefined float voltage. The charging status would stop when the charging current is reaching at setting current. PIN Name PIN Num I/O Description Note VBAT 1 2 145 146 PI/

PO Module Power Input, Battery Charge Output BAT_ID 185 AI Battery Detection BAT_THERM 134 AI Battery Thermal Detection BAT _P 133 AI Battery Voltage Detection +

BAT _M 183 AI Battery Voltage Detection -

Dont be float. Highly recommend an external 100KR resistor connecting to the ground when no battery ID. Dont be float. Connect to the battery NTC Resistor, Highly recommend an external 100KR resistor connecting to the ground when no battery. Connect to VBAT close to battery. Connect battery. to GND close to SIM8918x series module has the function of battery detection. Generally, there is a BAT_ID Pin in the battery. Highly recommend an external 100KR resistor (R2) connecting to the ground when the battery has no BAT_ID. Avoid float. SIM8918x series module has the function of battery temperature detection. This function requires an integrated thermistor in the battery (Recommend a 100KR 1% NTC Resistor). And the NTC resistor needs to connect to the BAT_THERM Pin. The module would charge fail when floating the BAT_THERM pin. www.simcom.com 18 / 53 SIM8918EA_SIM8918NA_User Manual SIM8918x series module has the function of batterys fuel gauge. It estimates the real-time power of the battery accurately. Not only protect the battery and prevent the over dis-charge but also help the users to estimate the entertainment time and save the important data. For different types of batteries, modifying the software settings enables the designated battery working properly. The BAT_P Pin and the BAT _M Pin must be connected whether the module is powering on by a battery or a stable power supply. The module would not work well if floating these two pins. These two pins are for battery voltage detection. Differential pair routing and stereo ground plane are needed. SIM8918x MODULE BATTERY CONNECTOR BAT_P BAT_M VBAT BAT_ID BAT_THERM GND VBATT BATT_ID BATT_THERM GND NTC R2 100K R3 100K Figure 14: Battery Connection Reference Design 3.6 USB Interface 3.6.1 Micro-USB Interface and Type-C Interface SIM8918x series module supports a USB interface, complying with USB 3.1/2.0 protocol and supporting USB OTG. The highest speed for the USB3.1 is up to 10Gbps, and for the USB 2.0 is up to 480Mbps. It is downward compatible with full speed (12Mbps) mode. USB_HS interface supports the function of the AT command transmission, of the data transmission, of the software debugging, and of the software upgrading. SIM8918x series module recommends Type-C USB. When used Micro-USB interfacethe CC1 pin need to connect to the Micro USB connectors USB_IDand 10K pull-up resistor to VBUS. www.simcom.com 19 / 53 SIM8918EA_SIM8918NA_User Manual The Type-C Interface Reference Design Figure 15: USB Type-C Connection Reference Design www.simcom.com 20 / 53 The Micro-USB Interface Reference Design SIM8918EA_SIM8918NA_User Manual igure 16: USB Micro-USB Connection Reference Design 3.6.2 Micro-USB Interface and Type-C Interface Feature PIN Name PIN Num USB Mode USB_SS1_RX_P/M USB_SS1_TX_P/M USB_SS2_RX_P/M USB_SS2_TX_P/M USB _DP/M USB_CC1/USB_CC2 USB_VBUS 252/270 254/253 152/192 150/151 13/14 249/246 141/142 USB_SS1_RX_P/M USB_SS1_TX_P/M USB_SS2_RX_P/M USB_SS2_TX_P/M USB _DP/M CC VBUS PCB wiring protocols and hardware design notices for USB signals ar listing below. www.simcom.com 21 / 53 SIM8918EA_SIM8918NA_User Manual Differential pair routing, 90+-10% differential impedance, and stereo ground plane are needed. Reserved ESD protection components close to the USB interface:

Highly recommend the TVS junction capacitance value on the USB2.0 signal lines less than 2pF. Highly recommend the TVS junction capacitance value on the USB3.1 signal lines less than 0.5pF. Do not wiring the USB signals under the crystal oscillator, the oscillator, the magnetic devices, and the RF signals. Highly recommend routing in the inner layer and stereo ground plane. Highly recommend the USB2.0 signals, the USB3.1 TX signals, and the USB 3.1 RX signals are wiring as differential pairs separately. 3.7 UART/SPI/I2C/I2S Interface SIM8918x series module supports multiple sets of the UART, the I2C, the SPI, and the I2S. The combination of multiple interfaces is flexible and achievable by the configuration of GPIOs. The interface voltage is 1.8V. 3.7.1 UART/SPI/I2C Interface Multiplexing Set PIN Name 1 2 2 3 4 UART0_CTS UART0_RTS UART0_TX UART0_RX CAM0_PWDN CAM1_PWDN TP_I2C_SDA TP_I2C_SCL DEBUG_TXD DEBUG_RXD GPIO_14 GPIO_15 GPIO_16 GPIO_17 PIN Num 36 37 34 35 80 82 48 47 94 93 118 119 116 117 GPIO GPIO_0 GPIO_1 GPIO_2 GPIO_3 GPIO_4 GPIO_5 GPIO_6 GPIO_7 GPIO_12 GPIO_13 Multiplex1 SPI Multiplex2 UART Multiplex3 I2C/I3C SPI1_MISO UART0_CTS I2C1_SDA/I3C1_SDA SPI1_MOSI UART0_RTS I2C1_SCL/I3C1_SCL SPI1_CLK UART0_TX SPI1_CS_N UART0_RX APPS_I2C_SDA APPS_I2C_SCL TP_I2C_SDA TP_I2C_SCL DEBUG_UART_TXD DEBUG_UART_RXD GPIO_14 SPI2_MISO UART2_CTS GPIO_15 SPI2_MOSI UART2_RTS I2C4_SDA I2C4_SCL GPIO_16 SPI2_SCLK UART2_TX GPIO_17 SPI2_CS_N UART2_RX www.simcom.com 22 / 53 CAM0_I2C_SDA CAM0_I2C_SCL CAM1_I2C_SDA CAM1_I2C_SCL UART1_RXD UART1_TXD GPIO_98 GPIO_99 GPIO_100 GPIO_101 GPIO_105 GPIO_104 GPIO_103 GPIO_102 84 83 205 166 153 154 265 105 264 239 102 101 103 104 SIM8918EA_SIM8918NA_User Manual CAM0_I2C_SDA CAM0_I2C_SCL CAM1_I2C_SDA CAM1_I2C_SCL UART1_RXD UART1_TXD DMIC1_CLK LPI_MI2S0_CLK DMIC1_DATA LPI_MI2S0_WS GPIO_22 GPIO_23 GPIO_29 GPIO_30 GPIO_70 GPIO_69 GPIO_98 GPIO_99 GPIO_100 DMIC2_CLK LPI_MI2S0_DATA0 GPIO_101 DMIC2_DATA LPI_MI2S0_DATA1 GPIO_105 GPIO_104 GPIO_103 GPIO_102 LPI_MI2S1_DATA1 LPI_MI2S1_DATA0 LPI_MI2S1_WS LPI_MI2S1_CLK SENSOR_I2C_SDA 92 GPIO_109 SENSOR_I2C_SCL 91 GPIO_110 SNSR_I3C_SDA SNSR_I3C_SCL 167 168 LPI_GPIO_21 LPI_GPIO_22 SENSOR_I2C_SDA SENSOR_I2C_SCL SNSR_I3C_SDA SNSR_I3C_SCL 5 6 7 8 9 10 11 SIM8918x series module defines the default configuration for these pins highlighting in green. Please consult SIMCom staff to review the reference design and functions for these pins. SIM8918x series module supports 2 sets of SPI, 3 sets of UART, and 8 sets of I2C (including cameras I2C), 2 sets of I2S. Choosing only one function among the SPI, the UART, and the I2C in the same bus set. For example, the SPI2 and the UART2 could not function well at the same time. Highly recommend an external 2.2KR resister pulling up to the 1.8V power supply for I2C. Do not reuse the Debug UART as GPIO12 and GPIO13. SPI interface could support the working frequency up to 50MHz. 3.7.2 UART Voltage Level Shift Circuit SIM8918x series module supports up to 3 sets of the UART interfaces, including the 2 sets of the 4-Lane interface, and the Debug UART for debugging. The two sets of the 4-Lane interface support the hardware flow control with the highest speed up to 4Mbps. The interface voltage for UART on the SIM8918x series module is 1.8V. Taking a voltage level shift chip for voltage switching if needed. Highly recommend pick TIs TXS0104EPWR, and the reference design is showing in the following Figures. www.simcom.com 23 / 53 SIM8918EA_SIM8918NA_User Manual VREG_L15A_1P8 100pF UART_CTS UART_RTS UART_TXD UART_RXD VCCA OE A1 A2 A3 A4 VCCB GND B1 B2 B3 B4 VDD_3.3V 100pF UART_CTS_3.3V UART_RTS_3.3V UART_TXD_3.3V UART_RXD_3.3V TXS0104EPWR Figure 17: UART Voltage Level Shift Reference Design The compatible reference design is showing below. SIM8918x Module VREG_L9A_1P8 VREG_L15A_1P8 4.7K DTE VDD 47K 4.7K TXD RXD Figure 18: TX Voltage Level Shift Reference Design SIM8918x Module VREG_L15A_1P8 VREG_L15A_1P8 4.7K DTE VDD 4.7K 47K RXD TXD Figure 19: RX Voltage Level Shift Reference Design www.simcom.com 24 / 53 3.7.3 SPI Interface SIM8918EA_SIM8918NA_User Manual SIM8918x series module supports up to 2 sets of the SPI interfaces. They only support the host mode, and the highest working frequency is 50MHz. PIN Name PIN Num UART0_CTS UART0_RTS UART0_TXD UART0_RXD GPIO_14 GPIO_15 GPIO_16 GPIO_17 36 37 34 35 118 119 116 117 I/O DI DO DO DO DO DO DI DO Description SPI1_MISO SPI1_MOSI SPI1_SCLK SPI1_CS_N SPI2_MISO SPI2_MOSI SPI2_SCLK SPI2_CS_N Notes SPI Data Input Signal SPI Data Output Signal SPI Clock Signal SPI Chip Select Signal SPI Data Input Signal SPI Data Output Signal SPI Clock Signal SPI Chip Select Signal 3.7.4 I2C Interface SIM8918x series module supports up to 8 sets of the I2C interfaces, but only open the following 6 sets of the I2C interfaces by default. They only support the host mode, and the highest speed is 400Kbps. Highly recommend an external 2.2KR resister pulling up to the 1.8V power supply for I2C. PIN Name TP_I2C_SDA TP_I2C_SCL CAM0_I2C_SDA CAM0_I2C_SCL CAM1_I2C_SDA CAM1_I2C_SCL PIN Num 48 47 84 83 205 166 I/O Pull Up Voltage Description Notes DI/DO VREG_L15A_1P8 TP I2C Data Signal DO VREG_L15A_1P8 TP I2C Clock Signal For TP DI/DO CAMERA IOVDD Camera I2C Data DO CAMERA IOVDD Camera I2C Clock DI/DO CAMERA IOVDD Camera I2C Data DO CAMERA IOVDD Camera I2C Clock SENSOR_I2C_SDA 92 DI/DO VREG_L15A_1P8 Sensor I2C Data SENSOR_I2C_SCL 91 DO VREG_L15A_1P8 Sensor I2C Clock SNSR_I3C_SDA SNSR_I3C_SCL 167 168 DI/DO VREG_L15A_1P8 Sensor I3C Data DO VREG_L15A_1P8 Sensor I3C Clock For Cameras For Cameras For Sensors For Sensors www.simcom.com 25 / 53 3.7.5 I2S Interface SIM8918EA_SIM8918NA_User Manual SIM8918x series module supports 2 set of the I2S interfaces. It supports the input- mode, the output-mode, and the host-/device-mode. PIN Name GPIO_98 GPIO_99 GPIO_100 GPIO_101 GPIO_102 GPIO_103 GPIO_104 GPIO_105 PIN Num 265 105 264 239 104 103 101 102 Multiple I2S LPI_MI2S0_CLK LPI_MI2S0_WS I/O DO DO Description I2S0 Clock I2S0 Word Select LPI_MI2S0_DATA0 DI/DO I2S0 Data0 LPI_MI2S0_DATA1 DI/DO I2S0 Data1 LPI_MI2S1_CLK LPI_MI2S1_WS DO DO I2S1 Clock I2S1 Word Select LPI_MI2S1_DATA0 DI/DO I2S1 Data0 LPI_MI2S1_DATA1 DI/DO I2S1 Data1 3.8 SD Card Interface SIM8918x series module supports SD 3.0/MMC cards with 4-Bit data interface or SDIO 3.0 devices. The SD cards comply with the following protocols. SD Specifications Part 1 Physical Layer Specification Version 3.00 Part A2 SD Host Controller Standard Specification Version 3.00 Part E1 SDIO Specification Version 3.00 www.simcom.com 26 / 53 SIM8918EA_SIM8918NA_User Manual SD_LDO4 VREG_L15A_1P8 SD_DATA2 SD_DATA3 SD_CMD SD_VDD SD_CLK SD_DATA0 SD_DATA1 SDCARD_DET_N SIM8918x Module 100K 10K_NC 51K_NC 0R TVS closed to SD card 4.7uF 33pF Figure 20: SD Card Reference Design SD CARD 1 DAT2 2 DAT3 3 CMD 4 VDD 5 CLK 6 VSS 7 DAT0 8 DAT1 9 DET_SW 10 GND 11 GND 12 GND 13 GND 3.9 TP Interface SIM8918x series module provides an I2C interface, an interruption function pin, and a reset pin, connecting the touching panel to operate. SIM8918x Module VREG_L15A_1P8 VREG_L15A_1P8 2.2 K 2.2K 10K GND TP_RST_N TP_I2C_SCL TP_I2C_SDA TP_INT_N VREG_L17A_3P0 1uF 33pF TP Interface 1 GND 2 TP_RST_N 3 TP_I2C_SCL 4 TP_I2C_SDA 5 TP_INT_N 6 TP_2V8 Figure 21: TP Interface Reference Design NOTE Highly recommend an external 2.2KR resister pulling up to the 1.8V power supply for TP I2C. www.simcom.com 27 / 53 SIM8918EA_SIM8918NA_User Manual 3.10 LCD Interface SIM8918x series modules video output interface meets the requirements of MIPI_DSI standard. It has a 4-

Lane DSI DPHY 1.2 interface with the speed up to 1.5Gbps. It supports screen display with the maximum resolution of 720*1680 (HD+) at 60Hz. The PWM pin of the module could control the backlight brightness by software configuration. The MIPI signal lines are high-speed signal lines. Highly recommend place a common mode inductor close to the LCM to avoiding EMI interference. Float the MIPI_Lane2 and the MIPI_Lane3 when the LCM only has 2-Lane differential pair data signals. Highly recommend adopting the modules integrated reference circuits if the LCD interface has no bias voltage hardware design. GPIO LCD_TE LCD_RST_N GND DSI_LN2_P DSI_LN2_N GND DSI_LN1_P DSI_LN1_N GND DSI_CLK_P DSI_CLK_N GND DSI_LN0_P DSI0_LN0_N GND DSI_LN3_P DSI0_LN3_N GND VREG_L15A_1P8 VDD_2V8 SIM8918x module PWM VREG_L17A_3P0 NC 100nF 0ohm LCM 1 LCD_ID 2 DSI_TE 3 LCD_RST 4 GND 5 TDP2 6 TDN2 7 GND 8 TDP1 9 TDN1 10 GND 11 TCP 12 TCN 13 GND 14 TDP0 15 TDN0 16 GND-

17 TDP3 18 TDN3 19 GND 20 VIO18 21 AVDD28 22 GND 23 VLED_N 24 VLED_P 25 GND VREG_L17A_3P0 VPH_PWR LCD_AVDD LDO EN GND 1uF 3P8S 10K 4.7uF VPH_PWR PWM Backlight Drive IC EN GND LED_N LED_P 10K 4.7uF Figure 22: LCD Interface & the Backlight Reference Design www.simcom.com 28 / 53 3.11 Camera Interface SIM8918EA_SIM8918NA_User Manual SIM8918x series modules video input interface meets the requirements of MIPI_CSI standard. 2 sets of 4-Lane CSI interfaces. Support 2 (4-Lane + 4-Lane ) cameras or Support 3 (4-Lane + 2-Lane + 1-Lane) cameras. Dual ISP support. Support DPHY 1.2 with the speed up to 1.5Gbps/Lane or support CPHY 1.0 with the speed up to 10.26Gbps(total). Two cameras: (13 MP + 13 MP or 25 MP) at 30 fps or (16 MP + 16 MP) at 24 fps, Only support one when the ISP is over 16M pixels. Support 3 MCLKs, 3 RESET, 2 CCI I2C interfaces, and the GPIOs with different functions. 3.11.1 CPHY & DPHY Interface of the Cameras SIM8918x series module supports CPHY 1.0. The difference between the CPHY and the DPHY are the different effective transmission mode. CPHY enables the data transmission speed faster through the following technical improvements. Firstly, CPHY converts the original 2-Lane group transmission of DPHY into 3-Lane group transmission. Then, CPHY does not need the Clock lane. The two are compatible in pin definitions. CSIx PHY1 of 2 DPHY Lane0 Lane1 Lane2 Lane3 Lane4 MIPI_CSIx_DCLK_P MIPI_CSIx_DCLK_N MIPI_CSIx_DLN0_P MIPI_CSIx_DLN0_N MIPI_CSIx_DLN1_P MIPI_CSIx_DLN1_N MIPI_CSIx_DLN2_P MIPI_CSIx_DLN2_N MIPI_CSIx_DLN3_P MIPI_CSIx_DLN3_N CPHY NC MIPI_CSIx_TLN0_A MIPI_CSIx_TLN0_B MIPI_CSIx_TLN0_C MIPI_CSIx_TLN1_A MIPI_CSIx_TLN1_B MIPI_CSIx_TLN1_C MIPI_CSIx_TLN2_A MIPI_CSIx_TLN2_B MIPI_CSIx_TLN2_C Figure 21 shows the application diagram of the CSI interface. It is a combination configuration, including 2 DPHY sensors, 2 CPHY sensors, a DPHY sensor, and a CPHY sensor.. The following applications are flexible. www.simcom.com 29 / 53 SIM8918EA_SIM8918NA_User Manual Figure 23: CPHY & DPHY Interface Applications 3.11.2 DPHY Applications SIM8918x Y H P Clock LANE#0 LANE#1 LANE#2 LANE#3 CAM0_PWDN s l o r t n o C CAM0_RST CAM0_MCLK CAM0_I2C_SDA CAM0_I2C_SCL Y H P Clock LANE#0 LANE#1 LANE#2 LANE#3 GPIO_47 CAM1_PWD_N s l o r t n o C GPIO_46 CAM1_RST_N GPIO_35 CAM3_MCLK CSI0 CSI1 C M E

D S E g n i r e t l i F D S E r o t c e t o r p VDD_IOVDD 2.2 K 2.2 K C M E

D S E g n i r e t l i F D S E r o t c e t o r p r o t c e n n o c a r e m a c r a e R r o t c e n n o c a r e m a c X U A VDD_2V8 DVDD_0 AFVDD_0/1 eLDO 1.05V eLDO 2.8V eLDO VPH_PWR GPIO VPH_PWR GPIO VDD_IOVDD VDD_2V8 DVDD_1 eLDO 1.05V VPH_PWR GPIO AFVDD_0/1 VDD_IOVDD CAM1_I2C_SDA 2.2 K CAM1_I2C_SCL 2.2 K VDD_IOVDD Place filters near connectors Figure 24: camera reference design www.simcom.com 30 / 53 SIM8918EA_SIM8918NA_User Manual 3.12 Audio Interface SIM8918x series module supports following audio interfaces:

Three analog audio inputs MIC1 differential pair interface for the master microphone MIC3 differential pair interface for the denoising microphone MIC2 single ended interface for the audio jack. Three-Channel analog audio output interface. Receiver Lineout Stereo Headphone Two-Channel digital microphone interface. Support 4 digital microphones. 3.12.1 Microphone Interface ECM Type A: Differential Place close to the microphone ends MIC_BIAS1 SIM8918x Module MIC1_P 1.1KR 0R 10pF 33pF TVS Differential Pair Wiring

& Stereo ground plane 10pF 33pF MIC1_N 0R 1.1KR ECM Type Microphone 10pF 33pF TVS Figure 25: ECM Type Microphone Reference Design(Differential) www.simcom.com 31 / 53 SIM8918EA_SIM8918NA_User Manual Place close to the microphone ends 10pF 33pF TVS 0R 2.2KR NC_0R ECM Type Microphone 0R B: Single-ended MIC_BIAS1 SIM8918x Module 2.2KR MIC1_P MIC1_N Figure 26: ECM Type Microphone Reference Design(single-ended) MEMS Type SIM8918x Module MIC_BIAS1 Place close to the microphone ends MEMS Type Microphone VDD OUT GND Differential Pair Wiring

& Stereo ground plane 0R 0R MIC1_P MIC1_N 1.1 uF 10pF 33pF TVS 0R Figure 27: MEMS Type Microphone Reference Design www.simcom.com 32 / 53 SIM8918x Module MIC_BIAS1 DMIC1_CLK DMIC1_DATA MIC_BIAS3 DMIC2_CLK DMIC2_DATA 0.1uF 0.1uF SIM8918EA_SIM8918NA_User Manual 0R 0R 0R 0R 0R 0R 0R 0R 0R 0R 0R 0R SEL BIAS CLK DATA SEL BIAS CLK DATA SEL BIAS CLK DATA SEL BIAS CLK DATA DMIC1 DMIC2 DMIC3 DMIC4 Figure 28: Digital Microphone Reference Design 3.12.2 Headphone Interface Place close to the headset jack. Reserved magnetic beads or 0R resistor for debugging. HS_DET HPH_R HPH_L MIC2_P HPH_REF SIM8918x Module 1000 OHM@100MHZ 1000 OHM@100MHZ 1000 OHM@100MHZ 1000 OHM@100MHZ 1000 OHM@100MHZ 33pF 33pF 33pF TVS Headphone Jack 0R Figure 29: Headphone Reference Design NOTE 1. Highly recommend the HS_DET and the HPH_L form a detection loop, and the HPH_L has an internal 100KR resistor pulling down to the ground. The HS_DET is connecting to the HPH_L presenting actively low when disconnecting the headphone. The HS_DET presenting high when inserting the headphone. 2. Picking a bidirectional TVS on the network due to the negative voltage on the HPH signal. www.simcom.com 33 / 53 SIM8918EA_SIM8918NA_User Manual Parameter Testing Condition Minimum Typical Maximum Unit Output Power 1 Input = 0 dBFS, 32 load. Output Power 2 Input = 0 dBFS, 16 load. Output Voltage Input = 0 dBFS Loads Off Impedance

0.94

31.25 62.5 0.99 16/32 20

mW mW Vrms 3.12.3 Lineout Interface SIM8918x series module output Class-AB differential LINEOUT_P/M. It can drive external speaker amplifier for loudspeaker. One differential class-AB amplifier 2Vrms ground reference differential output Programmable 0 dB or 6 dB gain Supports differential 1000ohm (minimum) and 300pF(typical ) load. Module LINEOUT_P LINEOUT_N 2.2uF 2.2uF Close to speaker Audio PA 10pF 33pF TVS 10pF 33pF 10pF 33pF TVS Figure 30: Speaker Reference Design www.simcom.com 34 / 53 SIM8918EA_SIM8918NA_User Manual 3.12.4 Handset Interface SIM8918x Module EAR_P EAR_N Place close to the Handset Differential Pair Wiring

& Stereo ground plane 10pF 33pF 10pF 33pF TVS 10pF 33pF 10pF 33pF 10pF 33pF 10pF 33pF TVS Figure 31: Handset Reference Design Parameter Testing Condition Minimum Typical Maximum Unit Output Power PA gain = 6 dB, 32 , THD+N 1%

PA gain = 6 dB, 10.67 , THD+N 1%

115

Output Voltage Input = 0 dBFS, PA gain = 6 dB 1.93 Loads 10.67 125

1.97 32

mW mW Vrms 3.13 USIM Card Interface SIM8918x series module offers two UIM Cards interface, supporting dual card dual standby. The UIM Cards interface also supports the 1.8V/2.95V dual voltage and the hot plug detection. NOTE The standard software version supports dual cards, and the single card function needs to be supported by the special software version. The reference design for the UIM Card is showing in the Figure 30. www.simcom.com 35 / 53 SIM8918EA_SIM8918NA_User Manual R1 100K/NC UIM_DET Default Configuration is low active:

UIM Card with DET Pin: Connect R1, R3, Disconnect R2 UIM Card no DET Pin: Disconnect R1, R3, Connect R2 22R 22R R3 0R/NC 22R R2 NC/0R 100nF 22pF VCC RST CLK DET GND VPP I/O COM UIM Card TVS C<30pF Figure 32: UIM Card Interface Reference Design VREG_L15A_1P8 USIM_VDD USIM_RST USIM_CLK USIM_DET USIM_DATA Module NOTE 1. The USIM_DATA Pin of the module pulls up to the USIM_VDD internally. Avoid external pull up. 2. Place the TVS close to the USIM Card receptacle interface. 3. Highly recommend the parasitic capacitance of the TVS on the USIM_CLK should be less than 30pF. 4. Highly recommend the 22R resistor in series on the signal lines to enhance the ESD protection. 5. Highly recommend reserved 22pF capacitor pulling down to the ground on the USIM_DATA line preventing the radio frequency interference. 3.14 ADC SIM8918x series module offers one 16-Bit resolution ADC providing by the power management IC. Parameter Description Minimum Typical Maximum Unit Input power domain Programmable Resolution Analog input bandwidth Sample rate ADC resolution (LSB) 1/1 channel end-to-end accuracy 1/1 channel end-to-end accuracy with internal www.simcom.com 0

16 500 4.8 64.879 6 7 1.875

11 12.5 V bits kHz MHz uV mV mV 36 / 53 Calibrated data result

-11 Calibrated data result

-12.5 SIM8918EA_SIM8918NA_User Manual Calibrated data result

-20 Trimmed value Trimmed value Trimmed value 99.5 398 29.7 10 1 10 100 100 30

20 100.5 402 30.3

mV k k k M M pull-up 1/3 channel end-to-end accuracy 100 K pull-up 400 K pull-up 30 K pull-up 1/1 channel AMUX input resistance 1/3 channel AMUX input resistance NOTE ADC input power domain is 0~1.875V. Highly recommend connecting the ADC with a resistance voltage division circuit preventing the module from burning due to the high power supply voltage ADC detection. 3.15 Sensor Interface SIM8918x series module communicates with sensors via I2C or I3C. It supports various sensors, including the hall sensor, the acceleration sensor, the geomagnetism sensor, the gyroscope sensor, the temperature sensor, the light sensor, and the pressure sensor. PIN Name PIN Num SENSOR_I2C_SCL 92 I/O DO Description Note Sensor I2C Clock Signal SENSOR_I2C_SDA 91 DI/DO Sensor I2C Data Signal Highly recommend an external 2.2KR resistor pulling up to the VREG_L15A_1P8 GPIO_32 GPIO_35 GPIO_33 GPIO_34 GPIO_36 99 107 DI DI 108 DI 109 110 DI DI SNSR_I3C_SDA 167 DI Accelerate Interruption Pin ACCL_GYRO_INT1 PS/Light Sensor Interruption Pin Gyroscope Sensor Interruption ALPS_INT_N Pin Magnetic Sensor Interruption Pin MAG_INT_N ACCL_GYRO_INT2 Hall Sensor Interruption Pin Sensor I3C Clock Signal HALL_INT Highly recommend an external 2.2KR resistor pulling up to SNSR_I3C_SCL 168 DI Sensor I3C Clock Signal www.simcom.com 37 / 53 SIM8918EA_SIM8918NA_User Manual the VREG_L15A_1P8 VREG_L15A_1P8 111 PO VREG_L17A_3P0 129 PO Sensor I2C Pull Up VDD or VDDIO Power Supply AVDD3.0V Power Supply for sensor 3.16 Motor Interface VIB_DRV_P SIM8918x Module 0R 1uF Motor Figure 33: Motor Interface Reference Design 3.17 LED Interface SIM8918x series module supports charge indicate LED. Selecting a LED chip with the common anode is needed. The maximum current on the channel is 5mA. USB_VBUS SIM8918x Module CHG_LED 5mA Figure 34: LEDs Interface Reference Design www.simcom.com 38 / 53 3.18 Flash LED Interface SIM8918EA_SIM8918NA_User Manual SIM8918x series module offers two channels of efficient FLASH_LED interface. The maximum current on each channel is 1A. FLASH_LED 100nF SIM8918x Module Flash1A Torch200mA Figure 35: Flash LED Interface Reference Design 3.19 Forced Emergency Download Interface SIM8918x series module offers a FORCED_USB_BOOT Pin, which is an emergency download interface. Pulling up the FORCED_USB_BOOT to the VREG_L15A_1P8 before powering on enables the module to run into the emergency download mode, which is also applying for the treatment when the product starts abnormally. Highly recommend reserved the testing points for software upgrading and debugging. SIM8908x Module VREG_L15A_1P8 FORCED_USB_BOOT 10K Figure 36: Emergency Download Interface Reference Design www.simcom.com 39 / 53 SIM8918EA_SIM8918NA_User Manual 4 WIFI & BT SIM8918x series module offers a common antenna interface combining the WIFI and the BT function. The customers could connect the external WIFI and BT two in one antenna via this interface. In the TDD mode, the WIFI and the BT coexist. 4.1 WIFI Outline SIM8918x series module supports the 2.4GHz and the 5GHz dual bands WLAN wireless communication. It supports multiple modes, including the 802.11a, the 802.11b, the 802.11g, the 802.11n, and the 802.11ac. The highest rate is 433Mbps. The characteristics are as follows. Support the 2.4GHz and the 5GHz dual frequency bands, with the frequencies of 2402MHz~2482MHz and 5180MHz~5825MHz respectively. Support the Wake-on-WLAN. Support the WAPI SMS4 hardware encryption. Support the AP mode and the STATION mode. Support the WIFI Direct. Support the 2.4G MCS 0~8 for HT20 and VHT20. Support the 2.4G MCS 0~7 for HT40 and VHT40. Support the 5G MCS 0~7 for HT20, HT40 Support the 5G MCS 0~8 for VHT20. Support the 5G MCS 0~9 for VHT40 and VHT80. 4.1.1 WIFI Feature 2.4GHz Mode 802.11b 802.11b 802.11g 802.11g 802.11n HT20 Rate Bandwidth Output Power1 CCK 1Mbps CCK 11Mbps 6Mbps 54Mbps MCS0

20M 20M 20M 15dBm2dB 15dBm2dB 15dBm2dB 15dBm2dB 15dBm2dB www.simcom.com 40 / 53 SIM8918EA_SIM8918NA_User Manual 802.11n HT20 802.11n HT40 802.11n HT40 802.11a 802.11a 802.11n HT20 802.11n HT20 802.11n HT40 802.11n HT40 802.11ac VHT20 802.11ac VHT20 802.11ac VHT40 802.11ac VHT40 802.11ac VHT80 802.11ac VHT80 MCS7 MCS0 MCS7 OFDM 6Mbps OFDM 54Mbps MCS0 MCS7 MCS0 MCS7 MCS0 MCS8 MCS0 MCS9 MCS0 MCS9 20M 40M 40M 20M 20M 20M 20M 40M 40M 20M 20M 40M 40M 80M 80M 15dBm2dB 14dBm2dB 14dBm2dB 16dBm2dB 8dBm2dB 16dBm2dB 10dBm2dB 13dBm2dB 8dBm2dB 16dBm2dB 8dBm2dB 13dBm2dB 8dBm2dB 11dBm2dB 8dBm2dB 5GHz NOTE The output power value is testing based on the standards of Mask and EVM. Standard Speed Bandwidth 802.11b 802.11b 802.11g 802.11g 802.11n HT20 802.11n HT20 802.11n HT40 802.11n HT40 CCK 1Mbps CCK 11Mbps 6Mbps 54Mbps MCS0 MCS7 MCS0 MCS7 2.4GHz 5GHz 802.11a OFDM 6Mbps

20M 20M 20M 20M 40M 40M 20M Receiving Sensitivity

< -89dBm

< -79dBm

< -85dBm

< -68dBm

< -85dBm

< -67dBm

< -82dBm

< -64dBm

< -85dBm www.simcom.com 41 / 53 SIM8918EA_SIM8918NA_User Manual 802.11a OFDM 54Mbps 20M 802.11n HT20 802.11n HT20 802.11n HT40 802.11n HT40 802.11ac VHT20 802.11ac VHT20 802.11ac VHT40 802.11ac VHT40 802.11ac VHT80 802.11ac VHT80 MCS0 MCS7 MCS0 MCS7 MCS0 MCS8 MCS0 MCS9 MCS0 MCS9 20M 20M 40M 40M 20M 20M 40M 40M 80M 80M

< -68dBm

< -85dBm

< -67dBm

< -82dBm

< -64dBm

< -85dBm

< -62dBm

< -82dBm

< -57dBm

< -79dBm

< -54dBm 4.2 BT Outline SIM8918x series module supports the BT5.0. It supports multiple modes, including the GFSK, the 8-DPSK, and the /4-DQPSK. The performance indexes are showing as follows. BT RF Feature BLE Emission Power: 7dBm2dB Emission Feature Mode DH5 2DH5 3DH5 Emission Power 10dBm2dB 8dBm2dB 8dBm2dB Receiving Feature Mode DH5 Receiving Sensitivity

< -90dBm 2DH5

< -90dBm 3DH5

< -80dBm www.simcom.com 42 / 53 SIM8918EA_SIM8918NA_User Manual 5 GNSS SIM8918x series module supports multiple positioning systems, including the GPS, the GLONSS, and the BeiDou. LNA is a built-in component in the module to effectively enhance the receiving sensitivity of GNSS. 5.1 GNSS Outline Paramater CN0 Static Drift Sensitivity TTFF Status CN Value CEP-50 Tracking Recapturing Cold Booting Cold Booting Warm Booting Hot Booting Typical 44@-130dBm 5

-159

-156

-148

<35

<15

<5 Unit dB/Hz m dBm dBm dBm s s s 5.2 GNSS RF & Antenna Design Guideline The GNSS signal is a weak signal. If the antennas and the routings are not designed properly, it is easy to interfere with the GNSS signal, resulting in the decline of the GNSS receiving sensitivity, and even the GNSS positioning time. To avoid the negative effects, the following principles shall be observed in GNSS RF Design. The isolation between the GNSS antenna and other antennas shall be at least 15dB. The GNSS RF signal lines and RF related components must be away from the high-speed signals, the power switch signals, and other clock signals. The GNSS antenna must be away from the LCD screen, the camera, and other peripherals. The GNSS antenna shall be placed close to the top of the equipment as far as possible. Refer to chapter 6.4 for the GNSS antenna reference design. www.simcom.com 43 / 53 SIM8918EA_SIM8918NA_User Manual 6 Antenna Interface SIM8918x series module has four antenna interfaces, including the MAIN antenna, the DRX antenna, the GNSS antenna, and the WIFI/BT antenna. To ensure the well RF performance of the products, the RF lines wiring through the antenna pin to the antenna interfaces must meet the following requirements. Ensure the RF lines are wiring with the 50 impedance. The RF lines must have a complete stereo ground plane. The RF lines must away from the other interference sources, including the high-speed signals, the clock signals, the sound sensing devices, and the motor, etc. The RF lines shall be as short as possible to avoid loss and interference. 6.1 MAIN Antenna & DRX Antenna The MAIN antenna interface and the DRX antenna interface feature are showing as follows. MAIN Antenna & DRX Antenna Feature PIN Name PIN Num I/O Description Feature ANT_MAIN 87 AI/AO 2G/3G/4G Main Antenna Interface 50 Impedance ANT_DRX 131 AI 4G DRX Antenna Interface 50 Impedance 6.1.1 Operating Frequency Band and Maximum power:

SIM8918x series modules operating frequency bands are showing as follows. Operating Frequency Band Band GSM850 Frequency 824-849MHz Maximum power Channel 33.0 dBm0.5 GSM1900 1850-1910MHz 29.0 dBm0.5 www.simcom.com 44 / 53 SIM8918EA_SIM8918NA_User Manual WCDMA B II 1850-1910MHz 23.0dBm +1/-3 WCDMA B V 824-849MHz 22.5dBm +1/-3 WCDMA B IV 1710-1755 MHz 22.5dBm +1/-3 LTE B2 1850-1910 MHz 23.0dBm 0.5 LTE B4 1710-1755 MHz 23.0dBm LTE B5 824-849MHz 23.0dBm 0.5 LTE B7 2500-2570MHz 23.0dBm 0.5 LTE B12 699-716MHz 23.0dBm 1.0 LTE B13 777-787MHz 23.0dBm 0.5 LTE B17 704-716MHz 23.0dBm 1.0 LTE B25 1850-1915MHz 23.0dBm LTE B26 814-849MHz 23.0dBm 1.5 LTE B38 2570-2620MHz 23.0dBm 0.5 LTE B41 2496-2690MHz 23.0dBm 0.5 LTE B66 1710-1780MHz 23.0dBm 0.5 www.simcom.com 45 / 53 LTE B71 663-698MHz 23.0dBm 0.5 GNSS(BDS/ Galileo/

GLONASS/ GPS):

1559~1610 MHz

SIM8918EA_SIM8918NA_User Manual www.simcom.com 46 / 53 6.1.2 RF Reference Design SIM8918EA_SIM8918NA_User Manual SIM8918x series modules MAIN antenna reference design is showing as follows. MAIN Antenna RF Testing Interface

(Optional) Antenna Matching Circuit R1 C1 C2 GND ANT_TRX GND 59 60 61 SIM8908x Module Figure 37: MAIN Antenna Reference Design R1, C1, and C2 are the antenna matching components. All these three components are adjustable to match the efficient and effective communication quality based on the interface debugging result. Selecting R1 with 0R resistor by default, and reserved C1 and C2 with disconnection by default. Highly recommend reserved an RF testing interface to modify accurately and conveniently. Considering the low cost, recommend ensure 50 impedance for the RF lines and cancel the RF testing interface. SIM8918x series modules DRX antenna reference design is showing as follows. DRX Antenna RF Testing Interface

(Optional) Antenna Matching Circuit R1 C1 C2 GND ANT_DRX GND 40 41 42 SIM8908x Module Figure 38: DRX Antenna Reference Design R1, C1 and C2 are the antenna matching components. All these three components are adjustable to match the efficient and effective communication quality based on the interface debugging result. Selecting R1 with 0R resistor by default, and reserved C1 and C2 with disconnection by default. Highly recommend reserved an RF testing interface to modify accurately and conveniently. Considering the low cost, recommend ensure www.simcom.com 47 / 53 50 impedance for the RF lines and cancel the RF testing interface. SIM8918EA_SIM8918NA_User Manual 6.2 WIFI/BT Antenna Interface SIM8918x series modules WIFI/BT antenna interface feature is showing as follows. WIFI/BT Antenna Feature PIN Name PIN Num I/O Description Feature ANT_WIFI/BT 77 AI/AO WIFI/BT Antenna Interface 50 Impedance SIM8918x series modules WIFI/BT operating frequency bands are showing as follows. WIFI/BT Operating Frequency Band and Maximum power Type 802.11a/b/g/n/ac BT 5.0 Frequency Band Maximum Power 2412MHz~2462 MHz 5150 MHz ~5825 MHz 2402 MHz ~2480 MHz 16.0dBm 0.5 10.5dBm 1 SIM8918x series modules WIFI/BT antenna reference design is showing as follows. WIFI/BT Antenna RF Testing Interface

(Optional) Antenna Matching Circuit R1 C1 C2 GND ANT_WIFI/BT GND 1 2 3 SIM8908x Module Figure 39: WIFI/BT Antenna Reference Design In Figure 37, R1, C1 and C2 are the antenna matching components. All these three components are adjustable to match the efficient and effective communication quality based on the interface debugging result. Selecting R1 with 0R resistor by default, and reserved C1 and C2 with disconnection by default. Highly recommend reserved an RF testing interface to modify accurately and conveniently. Considering the www.simcom.com 48 / 53 low cost, recommend ensure 50 impedance for the RF lines and cancel the RF testing interface. SIM8918EA_SIM8918NA_User Manual 6.3 GNSS Antenna Interface SIM8918x series modules GNSS antenna interface feature is showing as follows. GNSS Antenna Feature PIN Name ANT_GNSS PIN Num 121 I/O Description Feature AI GNSS Antenna Interface 50 Impedance SIM8918x series modules GNSS operating frequency bands are showing as follows. GNSS Operating Frequency Band Type GPS GLONASS BeiDou Frequency Band 1575.421.023 1597.5~1605.8 1559.05 1563.14 Unit MHz MHz MHz 6.3.1 GNSS Passive Antenna Reference Design SIM8918x series modules GNSS passive antenna reference design is showing as follows. GNSS Passive Antenna RF Testing Interface

(Optional) Antenna Matching Circuit R1 C1 C2 GND ANT_GNSS GND 48 49 50 SIM8908x Module Figure 40: GNSS Passive Antenna Reference Design www.simcom.com 49 / 53 SIM8918EA_SIM8918NA_User Manual R1, C1 and C2 are the antenna matching components. All these three components are adjustable to match the efficient and effective communication quality based on the interface debugging result. Selecting R1 with 0R resistor by default, and reserved C1 and C2 with disconnection by default. Highly recommend reserved an RF testing interface to modify accurately and conveniently. Considering the low cost, recommend ensure 50 impedance for the RF lines and cancel the RF testing interface. 6.3.2 GNSS Active Antenna Reference Design SIM8918x series modules GNSS active antenna reference design is showing as follows. RF Testing Interface

(Optional) Attenuator C1 GND ANT_GNSS 48 49 GND SIM8908x Module GNSS Active Antenna 47nH 10ohm VDD Figure 41: GNSS Active Antenna Reference Design In Figure 39, highly recommend reserved the attenuator, and the attenuation value is determined by the gain of the external active antenna. Generally speaking, the attenuation value and antenna gain of the attenuator meet the following formula. Antenna Gain = Attenuation value + Cable Losses VDD is using to for the active antennas power supply. The voltage value is determined by the antennas feature. C1 is using to isolate straight, and the default value is 33pF. Highly recommend reserved an RF testing interface to modify accurately and conveniently. Considering the low cost, recommend ensure 50 impedance for the RF lines and cancel the RF testing interface. 6.4 RF Signals PCB Wiring Guideline Highly recommend the characteristic impedance of all RF signal lines shall be controlled at 50 when the www.simcom.com 50 / 53 SIM8918EA_SIM8918NA_User Manual customers route their PCB. Generally, the impedance of RF signal lines is determined by the dielectric constant (ER), the wiring width (W), the ground clearance (S), the height of the reference ground plane (H), and other factors. RF routing characteristic impedance control usually adopts the microstrip-slot line and the coplanar waveguide-slot line. The reference designs of 50 impedance are showing as follows. Micro strip-slot Line Structure Layer1 Prepreg Layer2 2W 2W W H Figure 42: Two Layers PCB Microstrip-slot Line Structure Two Layers PCB Microstrip-slot Line Structure Impedance Control Feature Thickness Er Signal Thickness 1mm 1.6mm 4.2 4.2 0.035mm 0.035mm Signal Layer Layer1 Layer1 Reference Layer Impedance Width Layer2 Layer2 50 ohm 50 ohm 1.7mm67 mil 3mm118 mil Coplanar Waveguide-slot Line Layer1 Prepreg Layer2 S S W H Figure 43: Two Layers PCB Coplanar Waveguide-slot Line Structure Two Layers PCB Coplanar Waveguide-slot Line Structure Impedance Control Feature Thickness Er Signal Thickness Signal Reference Impedance S W 1mm 4.2 0.035mm Layer1 Layer2 50 ohm 0.65mm25.6 mil 0.2mm7.8 mil 1.6mm 4.2 0.035mm Layer1 Layer2 50 ohm 0.65mm25.6 mil 0.15mm5.9 mil www.simcom.com 50 / 53 SIM8918EA_SIM8918NA_User Manual S W S H Layer1 Prepreg Layer2 Prepreg Layer3 Prepreg Layer4 2W W 2W Figure 44: Four Layers PCB Coplanar Waveguide-slot Line Structure (Reference Layer Three) S W S H Layer1 Prepreg Layer2 Prepreg Layer3 Prepreg Layer4 Figure 45: Four Layers PCB Coplanar Waveguide-slot Line Structure (Reference Layer Four) 2W W 2W To ensure the well RF performance of the products, the RF lines wiring through the antenna pin to the antenna interfaces must meet the following requirements. Ensure the RF lines are wiring with the 50 impedance. The RF lines must have a complete stereo ground plane. Add more ground holes around the RF signal lines and the reference ground to enhance the RF performance. The RF lines must away from the other interference sources, including the high-speed signals, the clock signals, the sound sensing devices, and the motor, etc. The RF lines shall be as short as possible to avoid loss and interference. The GND pin adjacent to the RF interface pin of the module is not subject to thermal pad treatment and is in full contact with the ground. Avoid wiring crossing the whole PCB. Avoid the right-angle routing. Highly recommend wiring with a circular arc or a 135-degree routing. Be aware of the distance between the components and the lower PCB ground, especially for the RF connecting device package. Digging out the GND copper foil on the surface of the PCB below the connector if necessary. The distance between the ground hole and the signal line shall be at least 2 times the line width(2*W). www.simcom.com 51 / 53 SIM8918EA_SIM8918NA_User Manual 6.5 Antenna Installation 6.5.1 GNSS Passive Antenna Reference Design SIM8918x series modules antenna interface installation requirements are showing as follows. Antenna Installation Requirements Antenna Paramaters Requirements Standing wave ratio: 2 Gain (dBi):

GSM/WCDMA/LTE Wi-Fi/BT GSM/GPRS/EDGE 850: 0.64 dBi GSM/GPRS/EDGE 1900: 2.12 dBi WCDMA/HSDPA/HSUPA Band II: 2.12 dBi WCDMA/HSDPA/HSUPA Band IV: 2.95 dBi WCDMA/HSDPA/HSUPA Band V: 0.64 dBi LTE FDD Band 2: 2.12 dBi LTE FDD Band 4: 2.95 dBi LTE FDD Band 5: 0.64 dBi LTE FDD Band 7: 2.90 dBi LTE FDD Band 12: 1.57 dBi LTE FDD Band 13: 2.23 dBi LTE FDD Band 17: 1.57 dBi LTE FDD Band 25: 1.87 dBi LTE FDD Band 26: 1.40 dBi LTE FDD Band 66: 2.95 dBi LTE FDD Band 71: 0.22 dBi LTE TDD Band 38: 1.64 dBi LTE TDD Band 41: 2.90 dBi Maximum Input Power (W): 50 Input Impedance (): 50 Polarization Type: Vertical Insertion Loss: < 1dB

(GSM850/GSM1900, WCDMA B2/B4/B5, LTE B2/B4/B5/B7/B12/B13/B38/B41) Insertion Loss: < 1.5dB

(DCS1800/PCS1900, WCDMA B1/B2/B3/B4, LTE B1/B2/B3/B4/B39) Insertion Loss: < 2dB Standing wave ratio: 2

(2.4G) Gain (dBi): 4.01

(5G) Gain (dBi): 4.32 Maximum Input Power (W): 50 Input Impedance (): 50 Polarization Type: Vertical Insertion Loss: < 1dB

(B7/B38/B40/B41) www.simcom.com 52 / 53 GNSS SIM8918EA_SIM8918NA_User Manual Frequency Range: 1559 - 1607MHz Polarization Type: Right-Handed Circular or Linear Polarization Standing wave ratio: < 2 (Typical) Passive Antenna Gain: > 0dBi Active Antenna Noise Coefficient: < 1.5dB (Typical) Active Antenna Gain: > -2dBi Active Antenna Integrated LNA Gain: <17dB (Typical) Active Antenna Total Gain: <17dBi (Typical) www.simcom.com 53 / 53 SIM8918EA_SIM8918NA_User Manual 6.6 Safety Caution Safety Caution Marks Requirements When in a hospital or other health care facility, observe the restrictions about the use of mobiles. Switch the cellular terminal or mobile off, medical equipment may be sensitive and not operate normally due to RF energy interference. Switch off the cellular terminal or mobile before boarding an aircraft. Make sure it is switched off. The operation of wireless appliances in an aircraft is forbidden to prevent interference with communication systems. Forgetting to think much of these instructions may impact the flight safety, or offend local legal action, or both. Do not operate the cellular terminal or mobile in the presence of flammable gases or fumes. Switch off the cellular terminal when you are near petrol stations, fuel depots, chemical plants or where blasting operations are in progress. Operation of any electrical equipment in potentially explosive atmospheres can constitute a safety hazard. Your cellular terminal or mobile receives and transmits radio frequency energy while switched on. RF interference can occur if it is used close to TV sets, radios, computers or other electric equipment. Road safety comes first! Do not use a hand-held cellular terminal or mobile when driving a vehicle, unless it is securely mounted in a holder for hands free operation. Before making a call with a hand-held terminal or mobile, park the vehicle. www.si mcom.com 5 3 / 53 SIM8918EA_SIM8918NA_User Manual GSM cellular terminals or mobiles operate over radio frequency signals and cellular networks and cannot be guaranteed to connect in all conditions, especially with a mobile fee or an invalid SIM card. While you are in this condition and need emergent help, please remember to use emergency calls. In order to make or receive calls, the cellular terminal or mobile must be switched on and in a service area with adequate cellular signal strength. Some networks do not allow for emergency call if certain network services or phone features are in use (e.g. lock functions, fixed dialing etc.). You may have to deactivate those features before you can make an emergency call. Also, some networks require that a valid SIM card be properly inserted in the cellular terminal or mobile. FCC Statement This device complies with part 15 of the FCC rules. Operation is subject to the following two conditions: (1) this devi ce may not cause harmful interference, and (2) this device must accept any interference received, including inte rference that may cause undesired operation. Changes or modifications not expressly approved by the party responsible for compliance could void the users aut hority to operate the equipment. NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installe d and used in accordance with the instructions, may cause harmful interference to radio communications. However

, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause har mful interference to radio or television reception, which can be determined by turning the equipment off and on, t he user is encouraged to try to correct the interference by one or more of the following measures:

Reorient or relocate the receiving antenna. Increase the separation between the equipment and receiver. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced radio/TV technician for help. Important Note:

Radiation Exposure Statement This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator and your body. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter. Country Code selection feature to be disabled for products marketed to the US/Canada. This device is intended only for OEM integrators under the following conditions:

1. The antenna must be installed such that 20 cm is maintained between the antenna and users, and 2. The transmitter module may not be co-located with any other transmitter or antenna, 3. For all products market in US, OEM has to limit the operation channels in CH1 to CH11 for 2.4G band by supplied firmware programming tool. OEM shall not supply any tool or info to the end-user regarding to Regulatory Domain change. (if modular only test Channel 1-11) As long as the three conditions above are met, further transmitter testing will not be required. However, the OEM integrator is still responsible for testing their end-product for any additional compliance requirements required with this module installed. Important Note:

In the event that these conditions cannot be met (for example certain laptop configurations or co-location with another transmitter), then the FCC authorization is no longer considered valid and the FCC ID cannot be used on the final product. In these circumstances, the OEM integrator will be responsible for re-evaluating the end product

(including the transmitter) and obtaining a separate FCC authorization. SIM8918EA_SIM8918NA_User Manual End Product Labeling The final end product must be labeled in a visible area with the following" Contains FCC ID: 2AJYU-8XRA002 ". Manual Information to the End User The OEM integrator has to be aware not to provide information to the end user regarding how to install or remove this RF module in the users manual of the end product which integrates this module. The end user manual shall include all required regulatory information/warning as show in this manual. ISED Statement English: This device complies with Industry Canada licenseexempt RSS standard(s). Operation is subject to the following two conditions: (1) This device may not cause interference, and (2) This device must accept any interference, including interference that may cause undesired operation of the device. The digital apparatus complies with Canadian CAN ICES3 (B)/NMB3(B). French: Le prsentappareilestconforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitationestautorise aux deux conditions suivantes: (1) l'appareil ne doit pas produi re de brouillage, et (2) l'utilisateur de l'appareildoit accepter tout brouillageradiolectriquesubi, mmesi le brouillag eest susceptible d'encompromettre le fonctionnement. This radio transmitter (ISED certification number: 23761-8XRA002) has been approved by Industry Canada to operate with the antenna types listed with the maximum permissible gain indicated. Antenna types not included in this list, having a gain greater than the maximum gain indicated for that type, are strictly prohibited for use with this device. Le prsent metteur radio (ISED certification number: 23761-8XRA002) a t approuv par Industrie Canada pour fonctionner avec les types d'antenne numrs ci-dessous et ayant un gain admissible maximal. Les types d'antenne non inclus dans cette liste, et dont le gain est suprieur au gain maximal indiqu, sont strictement interdits pour l'exploitation de l'metteur. Antenna Type: External Antenna Antenna Gain:

WCDMA/HSDPA/HSUPA Band II: 2.12 dBi WCDMA/HSDPA/HSUPA Band IV: 2.95 dBi WCDMA/HSDPA/HSUPA Band V: 0.64 dBi LTE FDD Band 2: 2.12 dBi LTE FDD Band 4: 2.95 dBi LTE FDD Band 5: 0.64 dBi LTE FDD Band 7: 2.90 dBi LTE FDD Band 12: 1.57 dBi LTE FDD Band 13: 2.23 dBi LTE FDD Band 17: 1.57 dBi LTE FDD Band 25: 1.87 dBi LTE FDD Band 26: 1.40 dBi LTE TDD Band 41: 2.90 dBi LTE FDD Band 66: 2.95 dBi LTE FDD Band 71: 0.22 dBi WLAN 2.4G&Bluetooth: 4.53dBi WLAN 5G: 4.66dBi Radiation Exposure Statement This equipment complies with Canada radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator & your body. SIM8918EA_SIM8918NA_User Manual Dclaration d'exposition aux radiations Cet quipement est conforme Canada limites d'exposition aux radiations dans un environnement non contrl. Cet quipement doit tre install et utilis distance minimum de 20cm entre le radiateur et votre corps. This device is intended only for OEM integrators under the following condition:

The transmitter module may not be co-located with any other transmitter or antenna. As long as the condition above is met, further transmitter test will not be required. However, the OEM integrator is still responsible for testing their end-product for any additional compliance requirements required with this module installed. Cet appareil est conu uniquement pour les intgrateurs OEM dans les conditions suivantes:

Le module metteur peut ne pas tre complant avec un autre metteur ou antenne. Tant que les 1 condition ci-dessus sont remplies, des essais supplmentaires sur l'metteur ne seront pas ncessaires. Toutefois, l'intgrateur OEM est toujours responsable des essais sur son produit final pour toutes exigences de conformit supplmentaires requis pour ce module install. Important Note:

In the event that these conditions cannot be met (for example certain laptop configurations or co-location with another transmitter), then the Canada authorization is no longer considered valid and the IC cannot be used on the final product. In these circumstances, the OEM integrator will be responsible for re-evaluating the end product

(including the transmitter) and obtaining a separate Canada authorization. Note Importante:

Dans le cas o ces conditions ne peuvent tre satisfaites (par exemple pour certaines configurations d'ordinateur portable ou de certaines co-localisation avec un autre metteur), l'autorisation du Canada n'est plus considr comme valide et l' IC ne peut pas tre utilis sur le produit final. Dans ces circonstances, l'intgrateur OEM sera charg de rvaluer le produit final (y compris l'metteur) et l'obtention d'une autorisation distincte au Canada. End Product Labeling The final end product must be labeled in a visible area with the following: Contains IC: 23761-8XRA002. Plaque signaltique du produit final Le produit final doit tre tiquet dans un endroit visible avec l'inscription suivante: Contient des IC: 23761-

8XRA002 Manual Information to the End User The OEM integrator has to be aware not to provide information to the end user regarding how to install or remove this RF module in the users manual of the end product which integrates this module. The end user manual shall include all required regulatory information/warning as show in this manual. Manuel d'information l'utilisateur final L'intgrateur OEM doit tre conscient de ne pas fournir des informations l'utilisateur final quant la faon d'installer ou de supprimer ce module RF dans le manuel de l'utilisateur du produit final qui intgre ce module. Le manuel de l'utilisateur final doit inclure toutes les informations rglementaires requises et avertissements comme indiqu dans ce manuel. Caution:

(i)

(ii)

(iii) The device for operation in the band 51505250 MHz is only for indoor use to reduce the potential for harmful interference to co-channel mobile satellite systems;

(ii) For devices with detachable antenna(s), the maximum antenna gain permitted for devices in the bands 5250-5350 MHz and 5470-5725 MHz shall be such that the equipment still complies with the EIRP limit;

(iii) For devices with detachable antenna(s), the maximum antenna gain permitted for devices in the band 5725-5850 MHz shall be such that the equipment still complies with the EIRP limits specified for point-to-

point and non-point-to-point operation as appropriate; and Operations in the 5.25-5.35GHz band are restricted to indoor usage only. In addition, for the frequency band 5600-5650MHz of Canadian weather radar work, the equipment is limited by software to limit the work of this frequency band, and the user can not independently change. SIM8918EA_SIM8918NA_User Manual Avertissement:

(i)

(ii) les dispositifs fonctionnant dans la bande de 5150 5250MHz sont rservs uniquement pour une utilisation l'intrieur afin de rduire les risques de brouillage prjudiciable aux systmes de satellites mobiles utilisant les mmes canaux;

pour les dispositifs munis d'antennes amovibles, le gain maximal d'antenne permis pour les dispositifs utilisant les bandes de 5250 5350MHz et de 5470 5725 MHz doit tre conforme la limite de la p.i.r.e;

pour les dispositifs munis d'antennes amovibles, le gain maximal d'antenne permis (pour les dispositifs utilisant la bande de 5725 5850 MHz) doit tre conforme la limite de la p.i.r.e. spcifie pour l'exploitation point point et l'exploitation non point point, selon le cas;

Les oprations dans la bande de 5.25-5.35GHz sont limits un usage intrieur seulement.

(iii) www.simcom.com 54 / 53

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(2023-11-15) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: LETTER OF AGENT AUTHORIZATION To Whom It May Concern:

We, the undersigned, hereby authorize (Erik Yang at ICAS Testing Technology Service

(Shanghai) Co., Ltd.) to act on our behalf in all matters relating to application for equipment authorization, including the signing of all documents relating to these matters. We also hereby certify that no party to the application authorized hereunder is subject to the denial of benefits, including FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C.853(a). This agreement expires one year from the current date. Sincerely,

SIMCom Wireless Solutions Limited

(2023-11-15) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Attestation Statements Part 2.911(d)(5)(i) request for (FCC ID: 2AJYU-8XRA002)

[SIMCom Wireless Solutions Limited] (the applicant) certifies that the equipment for which authorization is sought is not covered equipment prohibited from receiving an equipment authorization pursuant to section 2.903 of the FCC rules. Sincerely, Yongsheng Li SIMCom Wireless Solutions Limited

(2023-11-15) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Attestation Statements Part 2.911(d)(5)(ii) request for (FCC ID: 2AJYU-8XRA002)

[SIMCom Wireless Solutions Limited] (the applicant) certifies that, as of the date of the filing of the application, the applicant is not identified on the Covered List as an entity producing covered equipment. Sincerely, Yongsheng Li

SIMCom Wireless Solutions Limited

(2023-11-15) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR (LTE Wireless Data Module/SIM8918NA# AND FCC ID: 2AJYU-8XRA002) To Whom It May Concern:

This letter serves as an official request for confidentiality under sections 0.457 and 0.459 of CFR 47. We have requested that the (Schematic diagram, Operation description, BOM List, Block Diagram, PCB layout, Tune-Up Procedure) required to be submitted with this application be permanently withheld from public review. the above documents are company proprietary information that could never get into the possession of your competition. Please contact me if there is any information you may need. Sincerely,

SIMCom Wireless Solutions Limited Request for Modular/Limited Modular Approval Date: November 10, 2023 Subject: Manufacturers Declaration for - Modular Approval

- Split Modular Approval

- Limited Modular Approval - Limited Split Modular Approval Confidentiality Request for: ______FCC ID: 2AJYU-8XRA002______ 8 Basic Requirements FCC Part 15.212(a)(1) For Items Marked NO(*), the Limited Module Description Must be Filled Out on the Following Pages Modular Approval Requirement Requirement Met 1. The modular transmitter must have its own RF shielding. This is intended to ensure that the module does not have to rely upon the shielding provided by the device into which it is installed in order for all modular transmitter emissions to comply with FCC limits. It is also intended to prevent coupling between the RF circuitry of the module and any wires or circuits in the device into which the module is installed. Such coupling may result in non-compliant operation. The physical crystal and tuning capacitors may be located external to the shielded radio elements. 15.212(a)(1)(i)

- YES - NO(*) Details: The module contains a metal shield which covers all RF components and circuitry. The shield is located on the top of the board next to antenna connector 2. The modular transmitter must have buffered modulation/data inputs (if such inputs are provided) to ensure that the module will comply with FCC requirements under conditions of excessive data rates or over-modulation. 15.212(a)(1)(ii)

- YES - NO(*) Details: Data to the modulation circuit is buffered as described in the operational description provided with the application 3. The modular transmitter must have its own power supply regulation on the module. This is intended to ensure that the module will comply with FCC requirements regardless of the design of the power supplying circuitry in the device into which the module is installed. 15.212(a)(1)(iii)

- YES - NO(*) Details: The module contains its own power supply regulation. Please refer to schematic filed with this application 4. The modular transmitter must comply with the antenna and transmission system requirements of 15.203, 15.204(b), 15.204(c), 15.212(a), and 2.929(b). The antenna must either be permanently attached or employ a unique antenna coupler (at all connections between the module and the antenna, including the cable). The professional installation provision of 15.203 is not applicable to modules but can apply to limited modular approvals under paragraph 15.212(b). 15.212(a)(1)(iv)

- YES - NO(*) Details: The module connects to its antenna using an UFL connector which is considered a non-standard connector. A list of antennas tested and approved with this device may be found in users manual provided with the application 5. The modular transmitter must be tested in a stand-alone configuration, i.e., the module must not be inside another device during testing. This is intended to demonstrate that the module is capable of complying with Part 15 emission limits regardless of the device into which it is eventually installed. Unless the transmitter module will be battery powered, it must comply with the AC line conducted requirements found in Section 15.207. AC or DC power lines and data input/output lines connected to the module must not contain ferrites, unless they will be marketed with the module (see Section 15.27(a)). The length of these lines shall be length typical of actual use or, if that length is unknown, at least 10 centimeters to insure that there is no coupling between the case of the module and supporting equipment. Any accessories, peripherals, or support equipment connected to the module during testing shall be unmodified or commercially available (see Section 15.31(i)). 15.212(a)(1)(v)

- YES - NO(*) Details: The module was tested stand-alone as shown in test setup photographs filed with this application SIMCom Wireless Solutions Limited Modular Approval Requirement 6. The modular transmitter must be labeled with its own FCC ID number, or use an electron display (see Requirement Met KDB Publication 784748). If using a permanently affixed label with its own FCC ID number, if the FCC ID is not visible when the module is installed inside another device, then the outside of the device into which the module is installed must also display a label referring to the enclosed module. This exterior label can use wording such as the following: Contains Transmitter Module FCC ID: XYZMODEL1 or Contains FCC ID:

XYZMODEL1. Any similar wording that expresses the same meaning may be used. The Grantee may either provide such a label, an example of which must be included in the application for equipment authorization, or, must provide adequate instructions along with the module which explain this requirement. In the latter case, a copy of these instructions must be included in the application for equipment authorization. If the modular transmitter uses an electronic display of the FCC identification number, the information must be readily accessible and visible on the modular transmitter or on the device in which it is installed. If the module is installed inside another device, then the outside of the device into which the module is installed must display a label referring to the enclosed module. This exterior label can use wording such as the following: Contains FCC certified transmitter module(s). Any similar wording that expresses the same meaning may be used. The user manual must include instructions on how to access the electronic display. A copy of these instructions must be included in the application for equipment authorization. 15.212(a)(1)(vi)

- YES - NO(*) Details: There is a label on the module as shown in the labeling exhibit filed with this application. Host specific labeling instructions are shown in the installation manual .filed with this application. 7. The modular transmitter must comply with all specific rule or operating requirements applicable to the transmitter, including all the conditions provided in the integration instructions by the grantee. A copy of these instructions must be included in the application for equipment authorization. For example, there are very strict operational and timing requirements that must be met before a transmitter is authorized for operation under Section 15.231. For instance, data transmission is prohibited, except for operation under Section 15.231(e), in which case there are separate field strength level and timing requirements. Compliance with these requirements must be assured. 15.212(a)(1)(vii)

- YES - NO(*) Details: The module complies with FCC Part 15C requirements. Instructions to the OEM installer are provided in the installation manual filed with this application. 8. The modular transmitter must comply with any applicable RF exposure requirements. For example, FCC Rules in Sections 2.1091, 2.1093 and specific Sections of Part 15, including 15.319(i), 15.407(f), 15.253(f) and 15.255(g), require that Unlicensed PCS, UNII and millimeter wave devices perform routine environmental evaluation for RF Exposure to demonstrate compliance. In addition, spread spectrum transmitters operating under Section 15.247 are required to address RF Exposure compliance in accordance with Section 15.247(b)(4). Modular transmitters approved under other Sections of Part 15, when necessary, may also need to address certain RF Exposure concerns, typically by providing specific installation and operating instructions for users, installers and other interested parties to ensure compliance. 15.212(a)(1)(viii)

- YES - NO(*) Details: The module meets Portable exclusion levels as shown in the RF exposure information filed with this application. SIMCom Wireless Solutions Limited Limited Module Description When Applicable

* If a module does NOT meet one or more of the above 8 requirements, the applicant may request Limited Modular Approval (LMA). This Limited Modular Approval (LMA) is applied with the understanding that the applicant will demonstrate and will retain control over the final installation of the device, such that compliance of the end product is always assured. The operating condition(s) for the LMA;

the module is only approved for use when installed in devices produced by grantee. A description regarding how control of the end product, into which the module will be installed, will be maintained by the applicant/manufacturer, such that full compliance of the end product is always ensured should be provided here. Details: N/A Software Considerations KDB 594280 / KDB 442812 (One of the following 2 items must be applied) Requirement 1. For non-Software Defined Radio transmitter modules where software is used to ensure compliance of the device, technical description must be provided about how such control is implemented to ensure prevention of third-party modification; see KDB Publication 594280. Requirement Met

- Provided in Separate Cover Letter

- N/A Details: <example The firmware of the device can not be modified or adjusted by the end user as described in a separate cover letter filed with this application. >

2. For Software Defined Radio (SDR) devices, transmitter module applications must provide a software security description; see KDB Publication 442812.

- Provided in Separate Cover Letter

- N/A Details: <example N/A>

Split Modular Requirements Requirement Provided in Manual 1. For split modular transmitters, specific descriptions for secure communications between front-end and control sections, including authentication and restrictions on third-party modifications; also, instructions to third-party integrators on how control is maintained.

- Provided in Separate Cover Letter

- N/A Details: <example N/A >

SIMCom Wireless Solutions Limited OEM Integration Manual Guidance KDB 996369 D03 Section 2 Clear and Specific Instructions Describing the Conditions, Limitations, and Procedures for third-parties to use and/or integrate the module into a host device. Requirement Is this module intended for sale to third parties?

- YES

- No, If No, and LMA applies, the applicant can optionally choose to not make the following detailed info public. However there still needs to be basic integration instructions for a users manual and the information below must still be included in the operational description. If the applicant wishes to keep this info confidential, this will require a separate statement cover letter explaining the module is not for sale to third parties and that integration instructions are internal confidential documents. Items required to be in the manual See KDB 996369 D03, Section 2 As of May 1, 2019, the FCC requires ALL the following information to be in the installation manual. Modular transmitter applicants should include information in their instructions for all these items indicating clearly when they are not applicable. For example information on trace antenna design could indicate Not Applicable. Also if a module is limited to only a grantees own products and not intended for sale to third parties, the user instructions may not need to be detailed and the following items can be placed in the operational description, but this should include a cover letter as cited above. 1. List of applicable FCC rules. KDB 996369 D03, Section 2.2 a. Only list rules related to the transmitter. 2. Summarize the specific operational use conditions. KDB 996369 D03, Section 2.3 a. Conditions such as limits on antennas, cable loss, reduction of power for point to point 3. Limited Module Procedures. KDB 996369 D03, Section 2.4 systems, professional installation info a. Describe alternative means that the grantee uses to verify the host meets the necessary limiting conditions b. When RF exposure evaluation is necessary, state how control will be maintained such that compliance is ensured, such as Class II for new hosts, etc. 4. Trace antenna designs. KDB 996369 D03, Section 2.5 a. Layout of trace design, parts list, antenna, connectors, isolation requirements, tests for design verification, and production test procedures for ensuring compliance. If confidential, the method used to keep confidential must be identified and information provided in the operational description. 5. RF exposure considerations. KDB 996369 D03, Section 2.6 a. Clearly and explicitly state conditions that allow host manufacturers to use the module. Two types of instructions are necessary: first to the host manufacturer to define conditions (mobile, portable xx cm from body) and second additional text needed to be provided to the end user in the host product manuals. 6. Antennas. KDB 996369 D03, Section 2.7 a. List of antennas included in the application and all applicable professional installer instructions when applicable. The antenna list shall also identify the antenna types

(monopole, PIFA, dipole, etc note that omni-directional is not considered a type) 7. Label and compliance information. KDB 996369 D03, Section 2.8 a. Advice to host integrators that they need to provide a physical or e-label stating Contains FCC ID: with their finished product 8. Information on test modes and additional testing requirements. KDB 996369 D03, Section 2.9 a. Test modes that should be taken into consideration by host integrators including clarifications necessary for stand-alone and simultaneous configurations. b. Provide information on how to configure test modes for evaluation 9. Additional testing, Part 15 Subpart B disclaimer. KDB 996369 D03, Section 2.10

- All Items shown to the left are provided in the Modular Integration Guide (or UM) for Full Modular Approval (MA) or LMA.

- An LMA applies and is approved ONLY for use by the grantee in their own products, and not intended for sale to 3rd parties as provided in a separate cover letter. Therefore the information shown to the left is found in the theory of operation. Sincerely, By:

(Signature/Title1) _____Yongsheng Li___________________

(Print name) 1 - Must be signed by applicant contact given for applicant on the FCC site, or by the authorized agent if an appropriate authorized agent letter has been provided. Letters should be placed on appropriate letterhead.

SIMCom Wireless Solutions Limited US Agent for Service of Process LETTER OF ATTESTATION TO:

Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 04/26/2023 Ref: Attestation Statement Part 2.911(d)(7) Filing Applicant:

Company name: SIMCom Wireless Solutions Limited Grantee code: 2AJYU FRN: 0025948449 Contact Name: Yongsheng Li Address: SIMCom Headquarters Building, Building 3, No.289 Linhong Road, Changning District, Shanghai,China Telephone No: +86 21 3252 3134 Email: yongsheng.li@simcom.com SIMCom Wireless Solutions Limited certifies that, as of the dates of this application, Americas Compliance Consulting LLC dba iCertifi iCertifi is our designated U.S. agent for service of process for the above referenced FCC ID. SIMCom Wireless Solutions Limited accepts to maintain an agent for no less than one year after the grantee has terminated all marketing and importation or the conclusion of any commission-related proceeding involving the equipment. The Applicant is aware of and agrees to comply with the requirements outlined in the FCC Equipment Authorization Program, Report and Order FCC 22-84, and clause 2.911. iCertifi accepts, as of the date of the filing of the application, the obligation of the designated U.S. agent for service process for the above referenced FCC ID. The US Agent for Service of Process is aware of and agrees to comply with the requirements outlined in the FCC Equipment Authorization Program, Report and Order FCC 22-84, and clause 2.911. Designated U.S. Agent Information:

Name: Americas Compliance consulting, LLC dba iCertifi FCC FRN: 0033399411 Address: 1001 SW Disk Drive, Suite 250, Bend, Oregon 97702 Contact Person: Paul Preston Tel: 866-885-4575 Email: fccagent@icertifi.com Sincerely, SIMCom Wireless Solutions Limited Americas Compliance Consulting LLC dba iCertifi Paul Preston Yongsheng Li V02072023