WRD3L Datasheet Global Intelligent Platform Product Manual Tuya WRD3L Wi-Fi Module Version: 2.0.1 Date: 2019-10-15 No.: 0000000001 1 Product Overview WRD3L is a low-power embedded Wi-Fi module that Tuya has developed. It consists of a highly integrated RF chip (RDA5981BM) and several peripheral components, with an embedded Wi-Fi network protocol stack and robust library functions. WRD3L is embedded with a low-power Arm Cortex-M4 CPU, 2 MB flash memory, and 448 KB static random-access memory (SRAM), and has extensive peripherals. WRD3L is an RTOS platform that integrates all function libraries of the Wi-Fi MAC and TCP/IP protocols. You can develop embedded Wi-Fi products as required. 1.1 Features Embedded low-power CPU, which can also function as an application processor Dominant frequency: up to 160 MHz Working voltage: 3.0 V to 3.6 V Peripherals: nine GPIOs, one universal asynchronous receiver/transmitter (UART), and one analog-to-digital converter (ADC) Wi-Fi connectivity 802.11b/g/n HT20 2.4GHz WiFi WPA, WPA2, WEP, and TKIP security modes Up to +203dBm output power Hangzhou Tuya Information Technology Co., Ltd. 1 V2.0.1 WRD3L Datasheet STA, AP, and STA+AP working modes Smart and AP network configuration modes for Android and iOS devices Onboard PCB antenna with a gain of 1.0 dBi Working temperature: 20C to +105C 1.2 Applications Intelligent building Smart household and home appliances Smart socket and light Industrial wireless control Baby monitor Network camera Intelligent bus Hangzhou Tuya Information Technology Co., Ltd. 2 V2.0.1 WRD3L Datasheet 2 Change History No. Date Change Description Version After Change 2019-09-13 This is the first release. 2.0.0 2019-10-15 Modified pin numbers and deleted the 2.0.1 architecture diagram. 1 2 Hangzhou Tuya Information Technology Co., Ltd. 3 V2.0.1 WRD3L Datasheet Contents 1 Product Overview ......................................................................................................... 1 1.1 1.2 Features .......................................................................................................... 1 Applications ..................................................................................................... 2 2 Module Interfaces ......................................................................................................... 6 2.1 2.2 2.3 Dimensions and Footprint ............................................................................... 6 Interface Pin Definition .................................................................................... 6 Test Pin Definition ........................................................................................... 8 3 Electrical Parameters ................................................................................................... 8 3.1 3.2 3.3 3.4 3.5 Absolute Electrical Parameters ....................................................................... 8 Electrical Conditions ....................................................................................... 9 WRD3L TX Power Consumption ................... 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WRD3L RX Power Consumption .................................................................... 9 Working Current ............................................................................................ 10 4 RF Features ................................................................................................................ 10 4.1 4.2 4.3 Basic RF Features ........................................................................................ 10 WRD3L TX Power ......................................................................................... 10 WRD3L RX Sensitivity .................................................................................. 11 5 Antenna Information ................................................................................................... 11 5.1 5.2 5.3 Antenna Type ................................................................................................ 11 Antenna Interference Reduction ................................................................... 11 Antenna Connector Specifications................................................................ 12 6 Packaging Information and Production Instructions................................................... 12 6.1 6.2 6.3 6.4 Mechanical Dimensions ................................................................................ 12 Recommended PCB Layout ......................................................................... 13 Production Instructions ................................................................................. 14 Recommended Oven Temperature Curve .................................................... 16 Hangzhou Tuya Information Technology Co., Ltd. 4 V2.0.1 WRD3L Datasheet 6.5 Storage Conditions ....................................................................................... 17 7 MOQ and Packing Information ................................................................................... 17 Figures Figure 1-1 WRD3L architecture .......................................... 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Figure 2-1 WRD3L front and rear views .............................................................................. 6 Figure 6-1 WRD3L mechanical dimensions ...................................................................... 12 Figure 6-2 Side view .......................................................................................................... 13 Figure 6-3 WRD3L pins ..................................................................................................... 13 Figure 6-4 Layout of the PCB to which WRD3L applies.................................................... 14 Figure 6-5 HIC for WRD3L ................................................................................................ 15 Tables Table 2-1 WRD3L interface pins .......................................................................................... 6 Table 2-2 WRD3L test pins .................................................................................................. 8 Table 3-1 Absolute electrical parameters ............................................................................ 8 Table 3-2 Normal electrical conditions ................................................................................. 9 Table 3-3 Power consumption during constant transmission ............ Error! Bookmark not defined. Table 3-4 Power consumption during constant receiving .................................................... 9 Table 3-5 WRD3L working current ..................................................................................... 10 Table 4-1 Basic RF features .............................................................................................. 10 Table 4-2 Power during constant transmission.................................................................. 10 Table 4-3 RX sensitivity ..................................................................................................... 11 Hangzhou Tuya Information Technology Co., Ltd. 5 V2.0.1 WRD3L Datasheet 3 Module Interfaces 3.1 Dimensions and Footprint WRD3L has two rows of pins with a 2 mm pin spacing. The WRD3L dimensions (H x W x D) are 3.00.15 mm x 160.35 mm x 240.35 mm. Figure 2-1 shows the WRD3L front and rear views. Figure 2-1 WRD3L front and rear views 3.2 Interface Pin Definition Table 2-1 WRD3L interface pins Pin No. Symbol I/O Type Function 1 2 3 4 nRST I/O Hardware reset pin (active at a low level) ADC AI ADC pin (See the following Note 2.) NC Input Null pin, no internal connection GPIO0 I/O GPIO_0, which is connected to GPIO0 (pin 36) on the internal IC Hangzhou Tuya Information Technology Co., Ltd. 6 V2.0.1 WRD3L Datasheet Pin No. Symbol I/O Type Function 5 6 7 8 9 GPIO24 I/O GPIO_24, a standard PWM pin, which is connected to GPIO24 (pin 32) on the internal IC GPIO23 I/O GPIO_23, a standard PWM pin, which is connected to GPIO23 (pin 33) on the internal IC GPIO22 I/O GPIO_22, a standard PWM pin, which is connected to GPIO22 (pin 34) on the internal IC VCC GND P P Power supply pin (3.3 V) Power supply reference ground pin 10 GPIO1 Output GPIO_1, which is connected to GPIO0 (pin 21) on the internal IC 11 GPIO2 Output UART2_TXD, which is used to display the module internal information and connected to GPIO2 (pin 22) on the internal IC 12 GPIO5 I/O GPIO_5, which is connected to GPIO5 (pin 14) on the internal IC 13 GPIO3 I/O GPIO_3, a standard PWM pin, which is connected to GPIO3 (pin 23) on the internal IC 14 GPIO25 I/O GPIO_25, a standard PWM pin, which is connected to GPIO25 (pin 31) on the internal IC 15 RX I/O UART_RX, which is connected to GPIO27 (pin 16) on the internal IC (See the following Note 3.) 16 TX Output UART_TX, which is connected to GPIO26 (pin 24) on the internal IC (See the following Note 3.) Note:
1. P indicates power supply pins, I/O indicates input/output pins, and AI indicates analog input pins. nRST is only a module hardware reset pin and cannot clear the Wi-
Fi network configuration. 2. This pin can only function as an ADC input and not a common I/O. If this pin is not used, it must be disconnected. When this pin is used as an ADC input, the input voltage range is 0 V to 2.0 V. Hangzhou Tuya Information Technology Co., Ltd. 7 V2.0.1 WRD3L Datasheet 3. The UART pins are user-side serial interfaces. 3.3 Test Pin Definition Table 2-2 WRD3L test pins Pin No. Symbol I/O Type Function N/A Used for the module production test N/A Note:
Test pins cannot be used. 4 Electrical Parameters 4.1 Absolute Electrical Parameters Table 3-1 Absolute electrical parameters Parameter Description Minimum Maximum Unit Value Value Ts VCC Storage 40 105 C temperature Power supply 3.0 3.6 V voltage Static electricity voltage Tamb = 25C N/A 2 kV
(human body model) Static electricity voltage Tamb = 25C N/A 0.5 kV
(machine model) Hangzhou Tuya Information Technology Co., Ltd. 8 V2.0.1 WRD3L Datasheet 4.2 Electrical Conditions Table 3-2 Normal electrical conditions Parameter Description Minimum Typical Maximum Unit Value Value Value Ta Working 20 N/A 105 C temperature VCC Working voltage 3.0 3.3 3.6 V VIL VIH VOL I/O low-level input 0.3 N/A VCC x 0.3 V I/O high-level input VCC x 0.7 N/A VCC V I/O low-level output N/A N/A VCC x 0.1 V VOH I/O high-level VCC x 0.8 N/A VCC V output Imax I/O drive current N/A N/A 10 mA 4.3 WRD3L RX Power Consumption Table 3-4 Power consumption during constant receiving Symbol Mode Rate Typical Value Unit IRF IRF IRF 802.11b 11 Mbit/s 80 802.11g 54 Mbit/s 80 802.11n MCS7 80 mA mA mA Hangzhou Tuya Information Technology Co., Ltd. 9 V2.0.1 WRD3L Datasheet 4.4 Working Current Table 3-5 WRD3L working current Working Mode Working Status (Ta = 25C) Average Value Unit EZ AP The module is in EZ mode. The module is in AP mode. 70 80 Connected The module is connected to the network. 70 mA mA mA 5 RF Features 5.1 Basic RF Features Table 4-1 Basic RF features Parameter Description Frequency band 2.4GHz Wi-Fi standard IEEE 802.11b/g/n20 Data transmission rate 802.11g: 6, 9, 12, 18, 24, 36, 48, or 54 (Mbit/s) 802.11b: 1, 2, 5.5, or 11 (Mbit/s) 802.11n: HT20 MCS0 to MCS7 Antenna type Onboard PCB antenna 5.2 WRD3L TX Power Table 4-2 Power during constant transmission Parameter Minimum Typical Maximum Unit Value Value Value Average RF output power, 802.11b 1 Mbit/s N/A 17 N/A dBm CCK mode Average RF output power, 802.11g 54 Mbit/s N/A 14 N/A dBm Hangzhou Tuya Information Technology Co., Ltd. 10 V2.0.1 WRD3L Datasheet Parameter Minimum Typical Maximum Unit Value Value Value OFDM mode Average RF output power, 802.11n MCS7 N/A 13 N/A dBm OFDM mode Frequency error 20 N/A
+20 ppm 5.3 WRD3L RX Sensitivity Table 4-3 RX sensitivity Parameter Minimum Typical Maximum Value Value Value PER < 8%, 802.11b CCK mode 1 Mbit/s N/A 90 N/A PER < 10%, 802.11g OFDM mode 54 Mbit/s N/A 73 N/A PER < 10%, 802.11n OFDM mode MCS7 N/A 70 N/A Unit dBm dBm dBm 6 Antenna Information 6.1 Antenna Type WRD3L uses an onboard PCB antenna. 6.2 Antenna Interference Reduction To ensure optimal Wi-Fi performance when the Wi-Fi module uses an onboard PCB antenna, it is recommended that the antenna be at least 15 mm away from other metal parts. To prevent adverse impact on the antenna radiation performance, avoid copper or traces along the antenna area on the PCB. Ensure that there are no substrate media above or below the antenna and that copper is Hangzhou Tuya Information Technology Co., Ltd. 11 V2.0.1 WRD3L Datasheet at a certain distance away from the antenna to maximize the antenna radiation performance. 6.3 Antenna Connector Specifications WRD3L does not use an antenna connector. 7 Packaging Information and Production Instructions 7.1 Mechanical Dimensions Figure 6-1 WRD3L mechanical dimensions Hangzhou Tuya Information Technology Co., Ltd. 12 V2.0.1 WRD3L Datasheet Figure 6-2 Side view 7.2 Recommended Pin figure Figure 6-3 WRD3L pins Hangzhou Tuya Information Technology Co., Ltd. 13 V2.0.1 WRD3L Datasheet Figure 6-4 Layout of the PCB to which WRD3L applies 7.3 Production Instructions 1. Use an SMT placement machine to mount the stamp hole module that Tuya produces onto the PCB within 24 hours after the module is unpacked and the firmware is burned. If not, vacuum pack the module again. Bake the module before mounting it onto the PCB.
(1) SMT placement equipment i. Reflow soldering machine ii. Automated optical inspection (AOI) equipment iii. Nozzle with a 6 mm to 8 mm diameter
(2) Baking equipment i. Cabinet oven ii. Anti-static heat-resistant trays iii. Anti-static heat-resistant gloves 2. Storage conditions for a delivered module are as follows:
Hangzhou Tuya Information Technology Co., Ltd. 14 V2.0.1 WRD3L Datasheet
(1) The moisture-proof bag is placed in an environment where the temperature is below 30C and the relative humidity is lower than 70%.
(2) The shelf life of a dry-packaged product is six months from the date when the product is packaged and sealed.
(3) The package contains a humidity indicator card (HIC). Figure 6-5 HIC for WRD3L 3. Bake a module based on HIC status as follows when you unpack the module package:
(1) If the 30%, 40%, and 50% circles are blue, bake the module for 2 consecutive hours.
(2) If the 30% circle is pink, bake the module for 4 consecutive hours.
(3) If the 30% and 40% circles are pink, bake the module for 6 consecutive hours.
(4) If the 30%, 40%, and 50% circles are pink, bake the module for 12 consecutive hours. 4. Baking settings:
(1) Baking temperature: 1255C
(2) Alarm temperature: 130C
(3) SMT placement ready temperature after natural cooling: < 36C
(4) Number of drying times: 1
(5) Rebaking condition: The module is not soldered within 12 hours after baking. 5. Do not use SMT to process modules that have been unpacked for over three months. Electroless nickel immersion gold (ENIG) is used for the PCBs. If the solder pads are exposed to the air for over three months, they will be oxidized severely and dry joints or solder skips may occur. Tuya is not liable for such problems and consequences. Hangzhou Tuya Information Technology Co., Ltd. 15 V2.0.1 WRD3L Datasheet 6. Before SMT placement, take electrostatic discharge (ESD) protective measures. 7. To reduce the reflow defect rate, draw 10% of the products for visual inspection and AOI before first SMT placement to determine a proper oven temperature and component placement method. Draw 5 to 10 modules every hour from subsequent batches for visual inspection and AOI. 7.4 Recommended Oven Temperature Curve 1. Perform SMT placement based on the following reflow oven temperature curve. The highest temperature is 245C. Based on the IPC/JEDEC standard, perform reflow soldering on a module at most twice. Hangzhou Tuya Information Technology Co., Ltd. 16 V2.0.1 WRD3L Datasheet 7.5 Storage Conditions 8 MOQ and Packing Information MOQ and packing information Product Model MOQ Packing Modules in Method Each Reel Number of Pack Carrier tape Number of Reel Packs in Each Box WRD3L and reel packing 9 Appendix: Statement Federal Communications Commission (FCC) Declaration of Conformity Hangzhou Tuya Information Technology Co., Ltd. 17 V2.0.1 WRD3L Datasheet FCC Caution: Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate this equipment. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. This device and its antenna(s) must not be co-located or operating in conjunction with any other antenna or transmitter. 15.105 Information to the user.
(b) For a Class B digital device or peripheral, the instructions furnished the user shall include the following or similar statement, placed in a prominent location in the text of the manual:
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 installed 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 harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the 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. This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20 cm between the radiator and your body. Radiation Exposure Statement:
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. Hangzhou Tuya Information Technology Co., Ltd. 18 V2.0.1 WRD3L Datasheet This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter. The availability of some specific channels and/or operational frequency bands is country dependent and firmware programmed at the factory to match the intended destination. The firmware setting is not accessible by the end user. The final end product must be labeled in a visible area with the following:
"Contains Transmitter Module 2ANDL-WRD3L"
This radio module must not be installed to co-locate and operating simultaneously with other radios in host system, additional testing and equipment authorization may be required to operating simultaneously with other radio. Declaration of Conformity European notice Hereby, Hangzhou Tuya Information Technology Co., Ltd. declares that this Wi-Fi module product is in compliance with essential requirements and other relevant provisions of Directive 2014/53/EC. A copy of the Declaration of conformity can be found at https://www.tuya.com. EN 300 328 V2.1.1 EN 301 489-1 V2.1.1; EN 301 489-17 V3.1.1 EN 62311:2008 EN 60950-1:2006+A11:2009+A1:2010+A12:2011+A2:2013 Hangzhou Tuya Information Technology Co., Ltd. 19 V2.0.1