FCC ID: ZMOFIBOCOMG610 Wireless Communication Module

G610 GPRS Module Hardware User Manual Version: V1.0.2 Date: 2011-03-31 Confidential Material This document contains information highly confidential to Shenzhen G&T Industrial Development Co., Ltd (Fibocom). Fibocom offers this information as a service to its customers, to support application and engineering efforts that use the products designed by Fibocom. The information provided is based upon requirements specifically provided to Fibocom by the customers. All specifications supplied herein are subject to change. Disclosure of this information to other parties is prohibited without the written consent of G&T. Copyright Transmittal, reproduction, dissemination and/or editing of this document as well as utilization of its contents and communication thereof to others without express authorization are prohibited. Offenders will be held liable for payment of damages. All rights created by patent grant or registration of a utility model or design patent are reserved. Copyright 1999-2010 Shenzhen G&T Industrial Development Co., Ltd. All rights reserved. Revision History Version V1.0.2 Date 2011-03-31 Remarks 1. Update UART description 2. Fix HS_DET description Trademarks Notice The FIBOCOM Logo is registered by Shenzhen G&T Industrial Development Co., Ltd. All other product or service names or Logos are the property of their respective owners. Copyright 1999-2010 Shenzhen G&T Industrial Development Co., Ltd. All rights reserved. G610 GPRS Module Hardware User Manual Page 2 of 47 Contents 1 Preface 2 3 Hardware Interface Description 3.1 Architecture Overview Digital Block Analog Block 3.1.1 3.1.2 3.1.3 GSM Transceiver Block Target Audience Applicable Documents Standards 1.1 Manual Scope 1.2 1.3 1.4 1.5 Regulatory Approvals 1.6 FCC Notice to Users Introduction 2.1 2.2 Product concept Product Specifications

................................................................................................................................................ 6

.......................................................................................................................... 6

....................................................................................................................... 6

............................................................................................................. 6

................................................................................................................................. 6

............................................................................................................... 7

................................................................................................................ 7

.......................................................................................................................................... 8

....................................................................................................................... 8

.............................................................................................................. 9

.........................................................................................................11

.............................................................................................................11

..................................................................................................................11

................................................................................................................11

............................................................................................... 12

.................................................................................................................... 12

......................................................................................................................... 13

.................................................................................................. 13

.................................................................................................... 15

......................................................................................................... 16

................................................................................................... 16

................................................................................................... 17

................................................................. 18

............................................................................................................................ 18

................................................................................................ 19

............................................................................. 19

............................................................................................. 20

..................................................................................................................... 22

................................................................................................. 22

........................................................................................................... 23 Turning the G610 On Turning the G610 Off Turning the G610 Off Using AT Command Activating Sleep Mode Serial Interface during Sleep Mode Terminating Sleep Mode VBACKUP description RTC Application Power Supply Design Power Consumption 3.2 Operating Modes 3.3 3.4 3.5 Power On/Off Operation 3.6 Real Time Clock 3.5.1 3.5.2 3.5.3 3.4.1 3.4.2 3.4.3 Power Supply 3.6.1 3.6.2 3.3.1 3.3.2 Sleep Mode G610 GPRS Module Hardware User Manual Page 3 of 47 Serial Interfaces SIM Interface Audio Interface 3.7 3.8 3.9 3.7.1 3.7.2 3.8.1 3.8.2 3.8.3 3.9.1 3.9.2 3.9.3 3.9.4 3.9.5 3.9.6 Ring indicate DCD indicate SIM Connection SIM Design Guidelines SIM Detected feature 1st 1st 2nd 2nd Audio Design Switch Audio Channel by IO

..................................................................................................................... 23

................................................................................................................ 24

............................................................................................................... 25

.......................................................................................................................... 25

........................................................................................................... 26

................................................................................................ 26

.................................................................................................. 27

....................................................................................................................... 27 Audio Channel: Microphone ................................................................................... 28 Audio Channel: Speaker ......................................................................................... 28 Audio Channel: Microphone .................................................................................. 28 Audio Channel: Speaker ........................................................................................ 29

............................................................................................................... 29

........................................................................................ 30

.......................................................................................................................... 30

...................................................................................................... 31

................................................................................................. 31

........................................................................................... 31

.......................................................................................... 32

............................................................................................................. 32

............................................................................................................................. 33

.................................................................................................................. 34

................................................................................................... 35

........................................ 36

............................................................ 36

.................................................... 36

....................................................................................... 36

............................................................................................................................ 40

............................................................................................ 40

................................................................................................... 41

...................................................................................................................... 42

..................................................................................................... 44

.............................................................................................................................. 45 3.10 A/D Interface 3.10.1 Power Supply ADC 3.10.2 General Purpose ADC 3.11 Controls and Indicators Interface 3.11.1 VDD Reference Regulator 3.11.2 External Reset 3.11.3 LPG 3.11.4 Trace Ports 3.11.5 General Purpose I/O 4 Electrical and Environmental Specifications Absolute Maximum Ratings 4.1 4.2 4.3 Electrical Specifications Absolute Maximum Ratings Environmental Specifications Absolute Maximum Ratings Application Interface Specifications 5 Mechanical Design 5.1 G610 Mechanical Specifications 5.2 Recommanded PCB layout:

5.3 5.4 Reflow temperature profile Antenna Design 6 Antenna Interface G610 GPRS Module Hardware User Manual Page 4 of 47 6.1 6.2 Antenna Installation Antenna Subsystem

................................................................................................................ 45

............................................................................................................... 45

................................................................................................ 45

.................................................................................................................. 45

...................................................................... 46

....................................................................................................... 46

........................................................................................ 46 Antenna Specifications Cable Loss Antenna Gain Maximum Requirements Antenna Matching PCB Design Considerations 6.2.1 6.2.2 6.2.3 6.2.4 6.2.5 G610 GPRS Module Hardware User Manual Page 5 of 47 Preface 1 Preface 1.1 Manual Scope This manual provides the electrical, mechanical and environmental requirements for properly integrating the G610 GPRS module in a host application. This manual gives a complete set of hardware features and functions that may be provided by G610. The availability of any feature or function, which is described in this manual, depends on the hardware revision and software version of a specific G610 GPRS module. 1.2 Target Audience This manual is intended for all members of the integration team who are responsible for integrating the G610 module into the host OEM device, including representatives from hardware, software and RF engineering disciplines. 1.3 Applicable Documents G610 GPRS Module brief G610 GPRS Module Description G610 GPRS Module AT Command Set User Manual G610 GPRS Module AT Command Examples and Steps G610 GPRS Module Developers Kit G610 GPRS Module Developers Kit User Manual G610 GPRS Module Developers Kit Schematics G610 Flash Tool Software (for Windows XP) G610 Mobile Analyzer Software (for Windows XP) G610 Modem Demo Software (for Windows XP) 1.4 Standards ETSI ETS 300 916 (GSM 07.07 version 5.9.1 Release 1996) ETSI TS 100 585 (GSM 07.05 version 7.0.1 Release 1998) ETSI ETS 300 901 (GSM 03.40 version 5.8.1 Release 1996) ETSI TS 100 900 (GSM 03.38 version 7.2.0 Release 1998) ETSI EN 300 607-1 (GSM 11.10-1 version 8.1.1 Release 1999) ETSI TS 100 907 (GSM 02.30 version 6.1.0 Release 1997) G610 GPRS Module Hardware User Manual Page 6 of 47 Preface ETSI TS 100 549 (GSM 03.90 version 7.0.0 Release 1998) ETSI TS 101 267 (GSM 11.14 version 6.3.0 Release 1997) ETSI TS 100 977 (GSM 11.11 version 6.3.0 Release 1997) ITU-T V.25ter ETSI EN 300 908 (GSM 05.02 version 8.5.1 Release 1999) ETSI TS 101 356 (3GPP TS 07.60 version 7.2.0 Release 1998) 1.5 Regulatory Approvals 1.6 FCC Notice to Users The G610 Module has been granted modular approval for mobile applications. Integrators may use the G610 Module in their final products without additional FCC certification if they meet the following conditions. Otherwise, additional FCC approvals must be obtained:

1. At least 20cm separation distance between the antenna and the users body must be maintained at all times. 2. To comply with FCC regulations limiting both maximum RF output power and human exposure to RF radiation, the maximum antenna gain including cable loss in a mobile-only exposure condition must not exceed 2dBi in the cellular band and 2dBi in the PCS band. 3. The G610 Module and its antenna must not be co-located or operating in conjunction with any other transmitter or antenna within a host device. 4. A label must be affixed to the outside of the end product into which the G610 Module is incorporated, ID:

following: For G610: This device contains FCC the to with a statement similar ZMOFIBOCOMG610 5. A user manual with the end product must clearly indicate the operating requirements and conditions that must be observed to ensure compliance with current FCC RF exposure guidelines. The end product with an embedded G610 Module may also need to pass the FCC Part 15 unintentional emission testing requirements and be properly authorized per FCC Part 15. Note: If this module is intended for use in a portable device, you are responsible for separate approval to satisfy the SAR requirements of FCC Part 2.1093. G610 GPRS Module Hardware User Manual Page 7 of 47 Introduction 2 2.1 Product concept G610 GPRS Module supports four GSM bands 850/900/1800/1900 MHz, and with GPRS multi-slot class 10, G610 can operate on any GSM/GPRS network to provide voice and data communications. The G610 is similar to a condensed cellular phone core, which can be integrated into any system or product that needs to transfer voice or data information over a cellular network. Thus, it significantly enhances the system's capabilities, transforming it from a standalone, isolated product to a powerful high-performance system with global communications capabilities. The G610 is designed as a complete GSM/GPRS communications solution with all the controls, interfaces and features to support a broad range of applications:

Low cost Wider voltage operate range A variety set of indicators and control signals More lower power consumption A variety of serial communications solutions. All these features and interfaces are easily controlled and configured using a versatile AT command interface that provides full control over the G610 operation. The G610 control and indication interface extends its capabilities beyond GSM communications. This includes an A/D and GPIO interface, and a regulated output voltage for supplying external circuits. With these interfaces, the G610 can operate and control external applications and receive feedback from external environment and circuits. The G610 interface design, using a single 50 pin board-to-board connector, through which all application interfaces are managed, facilitates fast and easy integration. It significantly shortens the development process, and minimizes the product's time to market. The G610 is extremely compact in size with a slim mechanical design, which makes it space saving on the application board and easily fitted into any board design. The advanced power supply management significantly reduces power consumption to a necessary minimum and prolongs battery life. G610 GPRS Module Hardware User Manual Page 8 of 47 2.2 Product Specifications Operating systems:

Size:

Mounting:

Weight:

Operational temperature:

Storage temperature:

Operating voltage:

Current consumption:

Tx power:

Rx sensitivity:

SIM Card:

Serial Ports:

Product Features Quad Band GSM850/900/1800/1900 MHz Physical Characteristics 31.4 x 20.2 x 3.0 mm SMT 3.5 grams

-40C to +85C

-40C to +85C Performance 3.3 4.5 V (4.0V is recommended) 1.6 mA @ Sleep mode 24 mA @ Idle mode 260 mA @ on call or CSD 420 mA @ on GPRS data MAX 2.0 A @ Burst 80uA@ Power off 12uA @ RTC only 2 W, 850/900 MHz 1 W, 1800/1900 MHz 850/900MHz: -108dBm 1800/1900MHz: -107 dBm Interfaces External SIM connectivity 1.8V / 3.0 V UART:

BR from 1200 bps to 230400 bps Auto BR from 1200 bps to 230400 bps G610 GPRS Module Hardware User Manual Page 9 of 47 GPRS:

CSD:

SMS:

FAX Data Features Multi-slot class 10 (4 Rx / 2 Tx / 5 Sum) Max Downlink BR 85.6 kbps Coding scheme CS1-CS4 Class B GSM 07.10 multiplexing protocol Max BR 9.6 kbps MO/MT Text and PDU modes Cell broadcast Group3 Class 2 (TS 61/62) Voice Features Differential analog audio lines Vocoders DTMF support Audio control:

ADC RTC inside Flexible status indicator Extend reset Two channel EFR/HR/FR/AMR Echo suppression, noise suppression, side tone and gain control Others Detect BATT voltage Detect extend analog voltage G610 GPRS Module Hardware User Manual Page 10 of 47 3 Hardware Interface Description The following paragraphs describe in details the hardware requirements for properly interfacing and operating the G610 module. 3.1 Architecture Overview The G610 consists of the following blocks:

3.1.1 Digital Block Micro-controller Unit (MCU) for system and application code execution. Digital Signal Processor (DSP) for voice and data processing. Serial communications interfaces. SPI for trace debug or PCM audio (option) SIM card General purpose IO signals. Real Time Clock (RTC) subsystem. 3.1.2 Analog Block Internal regulators Power management inside. Analog audio interface management. General purpose dedicated A/D signals. G610 GPRS Module Hardware User Manual Page 11 of 47 BATT voltage A/D inside 3.1.3 GSM Transceiver Block 3 gain stages for the low GSM band and high GSM band 850/900/1800/1900 MHz RF receiver, which includes LNAs, Mixers, VCOs, I/Q outputs and buffers. Signal processing IC for transmit and receive GSM data processing. FEM - Front End Module. Filter - Dual-band SAW filter that selects the required receive band. Includes a harmonic filter and antenna switch 3.2 Operating Modes The G610 incorporates several operating modes. Each operating mode is different in the active features and interfaces. The table summarizes the general characteristics of the G610 operating modes and provides general guidelines for operation. Operating Modes Description Features Not Powered BATT & Vbackup supply is disconnected. off Power Mode RTC Mode Idle Mode Valid BATT supply but not power on. After reset module. Vbackup output and VDD is off. Power off mode supply BATT disconnected. But Vbackup supply Power on is succeeded and VDD output. CTS_N and DSR_N signals are enabled (low). is valid The G610 is off. Any signals connected to the interface connector must be set low or tri-state. The G610 MCU/DSP/RF is Off. The PMU is operating in RTC mode. Any signals connected to the interface connector must be set low or tri-state. The G610 MCU/DSP/RF is Off. The PMU is operating in RTC mode. Any signals connected to the interface connector must be set low or tri-state. The G610 is fully active, registered to the GSM/GPRS network and to communicate. This is the default power-on mode. ready G610 GPRS Module Hardware User Manual Page 12 of 47 Sleep Mode CTS_N signal is wave. Call or CSD call or GPRS data LPG signal is toggling. to monitor The G610 is in low power mode. The application interfaces are disabled, but, G610 continues the GSM network. A GSM voice or data call is in progress. When the call terminates, G610 returns to the last operating state (Idle or Sleep). 3.3 Power Supply The G610 power supply must be a single external DC voltage source of 3.3V to 4.5V. The power supply must be able to sustain the voltage level during a GSM transmit burst current serge, which may reach 2.0A. The G610 interface connector has 2 pins for the main power supply, as described in the table. All these contacts must be used for proper operation. G610 Pin#

G610 Signal name Description BATT DC power supply. BATT = 3.3 V to 4.5 V 4.0V is recommended GND Ground 26 27 1 21 22 24 25 28 46 3.3.1 Power Supply Design Special care must be taken when designing the power supply of the G610. The single external DC power source indirectly supplies all the digital and analog interfaces, but also directly supplies the RF power amplifier (PA). Therefore, any degradation in the power supply performance, due to losses, noises or transients, will directly affect the G610 performance. The burst-mode operation of the GSM transmission and reception draws instantaneous current G610 GPRS Module Hardware User Manual Page 13 of 47 surges from the power supply, which causes temporary voltage drops of the power supply level. The transmission bursts consume the most instantaneous current, and therefore cause the largest voltage drop. If the voltage drops are not minimized, the frequent voltage fluctuations may degrade the G610 performance. BATT TX_EN It is recommended that the voltage drops during a transmit burst will not exceed 300mV, 300mV max 3.3V min measured on the G610 interface connector. In any case, the G610 supply input must not drop below the minimum operating level during a transmit burst. Dropping below the minimum operating level may result in a low voltage detection, which will initiate an automatic power-off. To minimize the losses and transients on the power supply lines, it is recommended to follow these guidelines:

Use a 1000 uF, or greater, low ESR capacitor on the G610 supply inputs. The capacitor should be located as near to the G610 interface connector as possible. Use low impedance power source, cabling and board routing. Use cabling and routing as short as possible. Filter the G610 supply lines using filtering capacitors, as described in the table. Recommended Usage Description Capacitor 1000 uF GSM Transmit current serge Minimizes power supply 10 nF, 100 nF Digital switching noise losses during transmit bursts. Use maximum possible value. Filters digital logic noises from clocks and data sources. G610 GPRS Module Hardware User Manual Page 14 of 47 8.2 pF, 10 pF 33 pF, 39 pF 1800/1900 MHz GSM bands Filters transmission EMI. 850/900 MHz GSM bands Filters transmission EMI. 3.3.2 Power Consumption The table specifies typical G610 current consumption ratings in various operating modes. The current ratings refer to the overall G610 current consumption over the BATT supply. Measurements were taken under the following conditions:

BATT = 4.0 V Operating temperature 25C Registered to a GSM/GPRS network The actual current ratings may vary from the listed values due to changes in the module's operating and environment conditions. This includes temperature, power supply level and application interface settings. Parameter Description Conditions Min Typ Max Unit I off Power off mode GSM only, DRX=2, I idle Idle mode I sleep Low power mode Average current I gsm-avg GSM voice

-85dBm GSM850/900 DSC/PCS DRX=2 5 9 GSM850/900 PCL=5 10 15 19 1 TX slot 1 Rx slot DCS/PCS PCL=0 5 10 15 Average current GSM850/900 A mA mA mA 90 80 24 3.6 2.0 1.6 260 150 115 110 230 140 115 110 2000 mA I gsm-max GSM voice PCL=5 1800 G610 GPRS Module Hardware User Manual Page 15 of 47 1 TX slot 1 Rx slot 19 DCS/PCS PCL=0 15 GSM850/900 PCL=5 19 DCS/PCS PCL=0 15 I gprs-avg Average current GPRS Class 10 2 TX slot 2 Rx slot 3.4 Power On/Off Operation mA 300 1400 300 420 150 380 150 The G610 power on and off is the two primary phases, which are related at the interface connector by the hardware signals POWER_ON, VDD. The POWER_ON signal is main controller. The VDD signal indicates whether G610 is powered on or off. When this signal is disable (0V), G610 is powered-off. When it is output (2.85V), G610 is powered-on. Important: When the VBAT power supplied, the G610 module will be turn on automatically. Important: The VDD would be flowed backwards by other IOs which be connected extend voltage. So DSR/CTS/LPG can be indicated the powered on process replaced. Important: The TXD should be pulled up continuously between the G610 turn on process. G610 Pin#

G610 Signal name Description 10 9 POWER_ON Power on and off module Low level activated Illustrating module start up VDD LDO power output 0V : G610 is power off LDO power output 2.85V : G610 is start up 3.4.1 Turning the G610 On When the G610 is powered off, the PMU operates at low power mode, with only the RTC timer active. G610 will power on again when the POWER_ON signal is falling edge. Asserting the POWER_ON signal low for a minimum of 800 milliseconds will turn G610 on. G610 GPRS Module Hardware User Manual Page 16 of 47 The figure illustrates the G610 power on is succeeded. VDD POWER_ON The figure illustrates the G610 power on is failed. VDD POWER_ON 3.4.2 Turning the G610 Off There are several ways to turn the G610 off:

Asserting the POWER_ON signal low for a minimum of 3 seconds. Under voltage automatic shutdown. Overvoltage automatic shutdown. AT command. 3.4.2.1 Turning the G610 Off Using POWER_ON The POWER_ON signal is set high using an internal pull up resistor when power is applied to G610. When the POWER_ON signal is falling edge and keeping low for a minimum of 3 seconds G610 GPRS Module Hardware User Manual Page 17 of 47 will turn G610 off. This will initiate a normal power-off process, which includes disabling of all applications interfaces (UART, SIM card, audio, etc.) and logout the network connection. VDD POWER_ON Turn off failed 3.4.2.2 Undervoltage automatic shutdown A low power shut down occurs when G610 senses the external power supply is below the minimal operating limit (VBAT3.2V). The module will respond by powering down automatically without notice. This form of power-down is not recommended for regular use since the unexpected power loss may result in loss of data. 3.4.3 Turning the G610 Off Using AT Command

+MRST The AT+MRST command initiates a G610 power off operation, which powers off the G610 without logout networks.

+CFUN The AT+CFUN=0 command initiates a G610 power off operation, which powers off the G610 with logout networks. 3.5 Sleep Mode The G610 incorporates an optional low power mode, called Sleep Mode, in which it operates in minimum functionality, and therefore draws significantly less current. During Sleep Mode the G610 network connection is not lost. G610 will be waked up cycled and monitored the GSM network constantly for any incoming calls or data. During Sleep mode, all of the G610 GPRS Module Hardware User Manual Page 18 of 47 G610 interface signals are inactive and are kept in their previous state, prior to activating low power mode. To save power, all the G610 internal clocks and circuits are shut down, and therefore serial communications is limited. The CTS_N signal is alternately enabled (LOW level) and disabled (HIGH level) synchronously with Sleep Mode and Idle mode. At the same time this indicates the G610 serial interfaces are active. Important: G610 will not enter Sleep mode in any case when there is data present on the serial interface or incoming from the GSM network or an internal system task is running. Only when processing of any external or internal system task has completed, G610 will enter Sleep mode according to the ATS24 command settings. Important: All of the description about CTS_N, it must be set the UART to HW control by AT command. 3.5.1 Activating Sleep Mode By default, the G610 powers on in Idle Mode. The ATS24 default is 0. In this mode the G610 interfaces and features are functional and the module is fully active. Sleep mode is activated by the ATS24 command. Such as ATS24 would be activated Sleep mode at soon. CTS RXD ATS24=1 return OK HIGH: disable, Sleep Mode LOW: enable, Idle Mode 3.5.2 Serial Interface during Sleep Mode The G610 wakes up periodically from Sleep mode to page the GSM network for any incoming G610 GPRS Module Hardware User Manual Page 19 of 47 calls or data. After this short paging is completed, G610 returns to sleep mode. During this short awake period, the serial interfaces are enabled and communications with the module is possible. The CTS_N signal is alternately enabled and disabled synchronously with the network paging cycle. CTS_N is enabled whenever G610 awakes to page the network. The period based on the DRX parameter of the network. 4.615 ms (TDMA frame duration) * 51 (number of frames) * DRX value. At the same time, the CTS_N indicates the G610 serial interfaces are active or inactive. CTS

(DRX=2) 3.5.3 Terminating Sleep Mode Terminating the Sleep mode, or wake-up, is defined as the transition of the G610 operating state from Sleep mode to Idle mode. There are several ways to wake-up G610 from Sleep mode as described below. Important: During Sleep mode the G610 internal clocks and circuits are disabled, in order to minimize power consumption. When terminating the Sleep mode, and switching to Idle mode, G610 requires a minimal delay time to reactivate and stabilize its internal circuits before it can respond to application data. This delay is typically of 5 ms, and is also indicated by the CTS_N signal inactive

(high) state. The delay guarantees that data on the serial interface is not lost or misinterpreted. 3.5.3.1 Temporary Termination of Low Power Mode Temporary termination of Sleep mode occurs when G610 switches from Sleep mode to Idle mode for a defined period, and then returns automatically to Sleep mode. Low power mode may be terminated temporarily by several sources, some of which are user initiated and others are initiated by the system. G610 GPRS Module Hardware User Manual Page 20 of 47 Incoming Network Data During Sleep mode, G610 continues monitoring the GSM network for any incoming data, message or voice calls. When G610 receives an indication from the network that an incoming voice call, message or data is available, it automatically wakes up from Sleep mode to alert the application. When G610 wakes up to Idle mode all its interfaces are enabled. Depending on the type of network indication and the application settings, G610 may operate in several methods, which are configurable by AT commands, to alert the application of the incoming data:

a) Enable the serial interface's CTS_N b) Send data to the application over the serial interface. c) Enable the serial interface's Ring Indicator (RING_N) signal. d) LPG status indicator Data on the Serial interface During Sleep mode, serial communications is limited to short periods, while G610 is paging the network. When the serial interface is active, data can be exchanged between the application and the G610. The G610 will not return to Sleep mode until the serial interface transmission is completed and all the data is processed. Only when the serial interface transfer is completed and the data is processed, G610 will return to Sleep mode automatically, according to the ATS24 settings. CTS RXD ATS24=1 a) The G610 serial interfaces be set HARDWARE FLOW (AT+IFC=2,2) If the G610 serial interfaces be set HARDWARE FLOW by AT+IFC command, and the DTE serial interfaces was running with HARDWARE FLOW, the TXD data will be sent to G610 by G610 GPRS Module Hardware User Manual Page 21 of 47 CTS_N enabled, the data will not be lost. And G610 will go back to Idle mode for response. b) The G610 serial interfaces be set NONE FLOW (AT+IFC=0,0)(The default value) If the G610 serial interfaces be set NONE FLOW by AT+IFC command, and the DTE serial interfaces was running with NONE FLOW, the TXD data will be sent to G610 anytime, the data will be lost. But then G610 will go back to idle mode if data and CTS_N enabled at the same time. 3.5.3.2 Permanent termination of Sleep Mode The G610 Sleep mode is enabled and disabled by the ATS24 command. ATS24 : ATS24 = 0 disables Sleep mode. The value of ATS24 (>0) will be saved but the mode will not be save by re-power G610. 3.6 Real Time Clock G610 incorporates a Real Time Clock (RTC) mechanism that performs many internal functions, one of which is keeping time. The RTC subsystem is embedded in the PMU and operates in all of the G610 operating modes (Off, Idle, Sleep), as long as power is supplied above the minimum operating level. When the main power was not supply, the backup battery or capacitor can be supplied to RTC by interface connector VBACKUP. When the main power supply and VBACKUP is disconnected from G610, the RTC timer will reset and the current time and date will be lost. On the next G610 power-up the time and date will need to be set again automatically or manually. 3.6.1 VBACKUP description G610 Pin#

G610 Signal name Description 8 VBACKUP Real time clock power When main power BATT is supplied. The VBACKUP output 2.0V/0.3mA current for external battery or capacitor charging When main power BATT is disconnected. The VBACKUP supply the RTC by. External battery or capacitor. The RTC power consumption is about 12uA. The voltage cannot be over 2.2V. The VBACKUP is supplied by a capacitor. The backup time can be calculated by capacitance approximately. G610 GPRS Module Hardware User Manual Page 22 of 47 T(s) C(uF)/1.3 3.6.2 RTC Application The G610 time and date can be set using the following methods:

Automatically retrieved from the GSM network. In case G610 is operated in a GSM network that supports automatic time zone updating, it will update the RTC with the local time and date upon connection to the network. The RTC will continue to keep the time from that point. Using the AT+CCLK command. Setting the time and date manually by this AT commands overrides the automatic network update. Once the time and date are manually updated, the RTC timer will keep the time and date synchronized regardless of the G610 operating state. 3.7 Serial Interfaces G610 includes one completely independent serial communications interfaces (UART). The G610 UART is a standard 8-signal bus. This UART is used for all the communications with G610 - AT commands interface, GPRS/EGPRS data and CSD data, programming and software upgrades. The UART signals are active low CMOS level signals. For standard RS232 communications with a PC, an external transceiver is required. G610 is defined as a DCE device, and the user application is defined as the DTE device. These definitions apply for the UART signals naming conventions, and the direction of data flow, as described in the figure. G610 Pin#

G610 Signal name 45 44 39 38 RXD_N TXD_N RING_N DSR_N Description Feature Direction Module DTE Transmitted Data Received Data DCEDTE DTEDCE DCEDTE DTE Transmitted Data Notice DTE Remote Call DCE Was Ready DCEDTE Module Received Data Module Ring indicator Module Data Set Ready G610 GPRS Module Hardware User Manual Page 23 of 47 42 40 43 41 RTS_N Request To Send DTR_N Data Terminal Ready CTS_N Module Clear To Send DCD_N Data Carrier Detect DTE Notice DCE Requested To Send DTE Was Ready DCE Switch To Received Mode Data Carrier Was Online DTEDCE DTEDCE DCEDTE DCEDTE The recommended connection was seeing as below. Application MCU RXD TXD RI DSR RTS DTR CTS DCD G610 Module RXD_N TXD_N RING_N DSR_N RTS_N DTR_N CTS_N DCD_N Pin 45 Pin 44 Pin 39 Pin 38 Pin 42 Pin 40 Pin 43 Pin 41 The G610 UART supports baud rates 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 230400 bps. Auto baud rate detection is supported for baud rates up to 230400 bps. All flow control handshakes are supported: hardware or none. The UART default port configuration is 8 data bits, 1 stop bit and no parity, with None flow control and auto baud rate detect enabled. Important: The auto baud will be availability at the first time after power on. The UART will be no answer probably if switch to another baud rate at working. 3.7.1 Ring indicate The RING_N signal serves to indicate incoming calls and other types of URCs (Unsolicited Result Code). It can also be used to send pulses to the host application, for example to wake up the G610 GPRS Module Hardware User Manual Page 24 of 47 application from power saving state. In IDLE mode, the RING_N is high. It is only indicating a type of event at a time:

a) When a voice call comes in, the RING_N line goes low for 1 second and high for another 4 seconds. Every 5 seconds as a cycle. b) When a FAX call comes in, the RING_N line low for 1s and high for another 4s. Every 5 seconds as a cycle. c) When a Short massage comes in, the RING_N line to low for 150 mS, and always high. 3.7.2 DCD indicate The DCD_N signal serves to indicate CSD call or GPRS data mode. The detail definition refers to AT&C command. 3.8 SIM Interface The G610 incorporates a SIM interface, which conforms to the GSM 11.11 and GSM 11.12 standards, which are based on the ISO/IEC 7816 standard. These standards define the electrical, signaling and protocol specifications of a GSM SIM card. The G610 does not incorporate an on-board SIM card tray for SIM placement. The SIM must be located on the user application board, external to the G610. The G610 SIM interface includes all the necessary signals, which are routed to the interface connector, for a direct and complete connection to an external SIM. G610 GPRS Module Hardware User Manual Page 25 of 47 The G610 supports 1.8V or 3.0V SIM card automatic. While the G610 turn on by POWER_ON. At first SIM_VCC output 1.8V voltage for external SIM card communication. If it is not successful SIM_VCC output 2.85V voltage and communicated SIM card again. Important:

If SIM_VCC is supplied, remove SIM card is prohibited. In case, it would damage both SIM card and G610. G610 Pin#

G610 Signal name Description 5 2 4 6 3 SIM_CLK SIM_VCC SIM_DATA SIM_RST SIM_CD Serial 3.25 MHz clock 2.85V Supply to the SIM Serial input and output data Active low SIM reset signal SIM card on site detected 3.8.1 SIM Connection The figure illustrates a typical SIM interface connection to G610. This connection type is implemented on the G610 Developer Board, using an MOLEX SIM tray, PN 912283001 &

912360001. 3.8.2 SIM Design Guidelines The SIM interface and signals design is extremely important for proper operation of G610 and the SIM card. There are several design guidelines that must be followed to achieve a robust and stable design that meets the required standards and regulations. The SIM should be located, and its signals should be routed, away from any possible EMI G610 GPRS Module Hardware User Manual Page 26 of 47 sources, such as the RF antenna and digital switching signals. The SIM interface signals length should not exceed 100 mm between the G610 interface connector and the SIM tray. This is to meet with EMC regulations and improve signal integrity. To avoid crosstalk between the SIM clock and data signals (SIM_CLK and SIM_DATA), it is recommended to rout them separately on the application board, and preferably isolated by a surrounding ground plane. The SIM card signals should be protected from ESD using very low capacitance protective elements (zener diodes, etc.). The recommended part no of ESD is AVR-M1005C080MTAAB (TDK). We also recommended the ESD component should layout with SIM hold closely. 3.8.3 SIM Detected feature When set AT+MSMPD=1, the SIM detected feature will be actives. The SIM card is on site or not will be detected with SIM_CD pin. SIM_CD=Low level, SIM card is onsite and register the network automatically. SIM_CD=High or NC, SIM card is off site and G610 drop out the network. Important: The default value of MSMPD parameter is 0. And also, the SIM detected feature was disabled correspondingly. 3.9 Audio Interface The G610 audio interface supports two channel audio devices and operating modes. The audio interface's operating modes, active devices, amplification levels and speech processing algorithms are fully controlled by the host application, through advanced programming options and a versatile AT commands set. G610 Pin# G610 Signal name Description 13 14 11 12 MIC-

MIC+

AUXI+

AUXI-

1st Audio channel Balanced microphone input 2nd Audio channel Balanced microphone input G610 GPRS Module Hardware User Manual Page 27 of 47 16 15 18 17 EAR-

EAR+

AUXO+

AUXO-

1st Audio channel Output is balanced and can directly operate an head set 2nd Audio channel Output is balanced and can directly operate an hand free speaker 3.9.1 1st Audio Channel: Microphone This channel is the G610 power-up default active audio channel. The microphone input includes all the necessary circuitry to support a direct connection to an external microphone device. It incorporates an internal bias voltage which can be adjusted by AT command. It has an impedance of 2 k. The bias voltage would be supplied after a voice call establish. Parameter Conditions Bias Voltage Gain AC Input Impedance No load Programmable in 3 dB steps Min 1.8 0 Typ 2.0 2 Max 2.2 45 Unit V dB k 3.9.2 1st Audio Channel: Speaker This channel is the G610 power-up default active output for voice calls and DTMF tones. It is designed as a differential output with 32 impedance. Parameter Conditions Min Typ Output Voltage AC Output Impedance DC Voltage No load Single ended 32 1.38 Max 200 Unit mVPP V 3.9.3 2nd Audio Channel: Microphone This channel is switched on by AT Command. The microphone input includes all the necessary circuitry to support a direct connection to an external microphone device. It incorporates an internal bias voltage which can be adjusted by AT G610 GPRS Module Hardware User Manual Page 28 of 47 command. It has an impedance of 2 k. The bias voltage would be supplied after G610 powered on. Parameter Conditions Min Typ Bias Voltage No load Gain AC Input Impedance Programmable in 3 dB steps 0 2 Max 2.5 45 Unit V dB k 3.9.4 2nd Audio Channel: Speaker This channel is switched on by AT Command. It is designed as a differential output and can be droved a 8 speaker directly. Parameter Output Voltage Conditions No load Single ended AC Output Impedance DC Voltage Min Typ 8 1.38 Max 500 Unit mVPP V 3.9.5 Audio Design The audio quality delivered by G610 is highly affected by the application audio design, particularly when using the analog audio interface. Therefore, special care must be taken when designing the G610 audio interface. Improper design and implementation of the audio interface will result in poor audio quality. Poor audio quality is a result of electrical interferences, or noises, from circuits surrounding the audio interface. There are several possible sources for the audio noise:

Transients and losses on the power supply EMI from antenna radiations Digital logic switching noise Most of the audio noise originates from the GSM transmit burst current surges (217 Hz TDMA buzz), which appear on the main power supply lines and antenna, but also indirectly penetrate the internal application's supplies and signals. The noises are transferred into the G610's audio circuits G610 GPRS Module Hardware User Manual Page 29 of 47 through the microphone input signals and then are amplified by the G610's internal audio amplifiers. To minimize the audio noise and improve the audio performance the microphone and speaker signals must be designed with sufficient protection from surrounding noises. The following guidelines should be followed to achieve best audio performance:

Reference the microphone input circuits to the G610 AGND interface signal. If using single-ended audio outputs, they should be referenced to the G610 AGND interface signal. Keep the audio circuits away from the antenna. Use RF filtering capacitors on the audio signals. The audio signals should not be routed adjacent to digital signals. Isolate the audio signals by a surrounding ground plane or shields. Filter internal supplies and signals that may indirectly affect the audio circuits, from noises and voltage drops. 3.9.6 Switch Audio Channel by IO The G610 support switch audio channel by IO pin. The default level of this pin is high. This IO pin is took effect under 1st channel is activated. When the IO is pulled low, the audio channel will be switched from 1st channel to 2nd channel automatically. When the IO level is back to High, the audio channel will be back to 1st channel. If the audio 2nd channel is activated, this PIN will not do any effect at all. G610 Pin#

G610 Signal name Description 47 HS_DET Level = Low, the 2nd channel is activated Level = High, back to the 1st channel Notes After the MAPATH command was switch the audio channel, this PIN will not do any 1st channel is activated. effect at all. 3.10 A/D Interface The G610 includes 3 Analog to Digital Converter (ADC) (2 ADC and 1 BATT ADC ) signals with 12-bit resolution, for environmental and electrical measurements. The ADC signals accept an analog DC voltage level on their inputs and convert it to a 12-bit digital value for further processing by G610 or the user application. In Idle mode, the ADC input is sampled consecutive times by sampling time interval, and the G610 GPRS Module Hardware User Manual Page 30 of 47 lasted 8 samples are compared and averaged to provide a stable and valid result. In Sleep mode, the ADC is stopped. When the G610 switch to Idle mode, the ADC should be stable after 5mS. 3.10.1 Power Supply ADC The main power supply (BATT) is sampled internally by the G610 ADC interface through a dedicated input, which is not accessible on the interface connector. The G610 constantly monitors the power supply for any low or high voltage. Parameter Conditions Supply Range Operating range Resolution Min 3.20 Typ 1.0 Sampling Time Max 4.50 16 Unit V

KHz The ADC signals operation and reporting mechanism is defined by the AT+CBC command. 3.10.2 General Purpose ADC The G610 provides 2 general purpose ADC signal for customer application use. The ADC signal can monitor a separate external voltage and report its measured level independently to the application, through the AT command interface. G610 Pin#

G610 Signal name Description 19 20 ADC2 ADC1 General purpose ADC General purpose ADC Parameter Input Voltage Resolution Conditions Operating range Min 0 Typ 0.5 Sampling Time Max 1.00 16 Unit V

KHz The ADC signals operation and reporting mechanism is defined by the AT+MMAD command. 3.11 Controls and Indicators Interface The G610 incorporates several interface signals for controlling and monitoring the module's operation. The following paragraph describes these signals and their operation. G610 GPRS Module Hardware User Manual Page 31 of 47 G610 Pin#

G610 Signal name 9 49 7 VDD LPG RESET_N 3.11.1 VDD Reference Regulator Description LDO power output Illustrating module start up Module work status indicator Extend reset module Low level activated The G610 incorporates a regulated voltage output VDD. The regulator provides a 2.85V output for use by the customer application. This regulator can source up to 30 mA of current to power any external digital circuits. When the G610 started up by power on signal, The VDD is output. So it can be Illustrating module start up. Important: The VDD regulator is powered from the G610's main power supply, and therefore any current sourced through this regulator originates from the G610 BATT supply. The overall BATT current consumed by G610 is directly affected by the VDD operation. The G610 current consumption raises with respect to the current sourced through VDD. Parameter Vout Iout Imax External Capacitor PSRR Conditions Iout=30mA Current pulled down from LDO to GND until LDO voltage is 50% of nominal value Min

-3%

Typ 2.85 10 Max 3%

30 Unit V mA 150 mA

-35%

1 35%

50 Hz - 20 kHz 35 uF dB 3.11.2 External Reset The RESET_N input signal would be power off the G610 immediately. This signal is set high after power up, when G610 is operating. It is set low when G610 is powered off. When the RESET_N signal is low, the G610 is powered off without the work net logging out. Important:

Its recommended that it should connect he 1nF capacitor to GND on external G610 GPRS Module Hardware User Manual Page 32 of 47 circuit. Parameter T width Conditions Min 100 Typ 200 Max 400 Unit mS 3.11.3 LPG As an alternative to generating the synchronization signal, the control pin can be used to drive a status LED on application platform. The timing of LPG, it can be indicated the G610 status straight. Referenced circuits about LED driver see below. States of the LED vs PIN: LED Off = HIGH. LED On = LOW. LED state Operating status of G610 Permanently off 600 ms on / 600 ms off 3 s on / 75 ms off 75 ms on / 75 ms off Permanently on G610 is in one of the following modes:

Power off mode SLEEP mode G610 is in one of the following status:

NO SIM card SIM PIN Register network (T<15S) Register network failure (always) G610 is in one of the following status:

IDLE mode G610 is in one of the following status:

One or more GPRS contexts activated. G610 is in one of the following status:

Voice call CSD or FAX call G610 GPRS Module Hardware User Manual Page 33 of 47 When the G610 POWER ON , the LPG timing see as below:

POWER_ON Register network IDLE mode 3.11.4 Trace Ports The GSM/GPRS network and G610 module is incorporated a complicated system. The G610 prepared the trace function for debugged or acquired the data of the system. The G610 transfer these data from SPI port. It can be operated on the PC software and execute by SPI adaptor to RS232. Important:

Its recommend that reserved these ports and connected to a socket in any design. G610 Pin#

G610 Signal name Description 53 50 52 51 48 PCM_DIN TR_MISO PCM_FS TR_MOSI PCM_CLK TR_CLK PCM_DOUT TR_CS TR_INT Trace data input Trace data output Trace clock output General purpose I/O Trace Interrupt Input G610 GPRS Module Hardware User Manual Page 34 of 47 3.11.5 General Purpose I/O The G610 incorporates 8 general purpose IO signals for the user application. Each GPIO signal may be configured and controlled by AT command. These signals may be used to control or set external application circuits, or to receive indications from the external application. G610 Pin# G610 Signal name Description 35 34 33 32 37 36 31 54 GPIO01 GPIO02 GPIO03 GPIO04 SCL/GPIO18 SDA/GPIO19 GPIO07 GPIO36 Bit1 Bit2 Bit3 Bit4 Bit5 Bit6 Bit7 Bit8 G610 GPRS Module Hardware User Manual Page 35 of 47 4 Electrical and Environmental Specifications Absolute Maximum Ratings 4.1 Electrical Specifications Absolute Maximum Ratings The table gives the maximum electrical characteristics of the G610 interface signals. Caution: Exceeding the values may result in permanent damage to the module. Unit Conditions Parameter Max Min BATT Supply Digital Input Signals G610 powered on

-0.2

-0.2 4.5 3.3 VDD Domain Analog Input Signals

(Audio, A/D interfaces) G610 powered on

-0.2 2.75 V V V 4.2 Environmental Specifications Absolute Maximum Ratings The table gives the environmental operating conditions of the G610 module. Caution: Exceeding the values may result in permanent damage to the module. Unit Conditions Parameter Max Min Ambient Operating Temperature Storage Temperature ESD At antenna port Contact Air At plane

-40 85 C

-40 85 4 C KV 8 KV 4.3 Application Interface Specifications The table summarizes the DC electrical specifications of the application interface connector signals. Important: Interface signals that are not used by the customer application must be left unconnected. G610 incorporates the necessary internal circuitry to keep unconnected signal in their G610 GPRS Module Hardware User Manual Page 36 of 47 default state. Do not connect any components to, or apply any voltage on, signals that are not used by the application. G610 Pin# G610 Signal name Description I/O Reset level Idle level Level Character BATT DC power supply GND Ground Power I 3.3V ~ 4.5V 26 27 1 21 22 24 25 28 46 8 29 30 49 9 7 VBACKUP Real time clock power I/O 2.0V 2.0V CHARG_CDT CHARG_CS Charge power detect signal High level activated Charge switch control Extend transistor I I PD OC/PD L L LPG VDD RESET_N 10 POWER_ON 45 44 39 38 42 40 RXD_N TXD_N RING_N DSR_N RTS_N DTR_N Control & Status Work mode indicator LDO power output Illustrating start up Extend reset**

Low level activated Turn on module Low level activated O O I I Uart (Modem DCE) Received Data Transmitted Data Ring indicator Data Set Ready Request To Send Data Terminal Ready O I O O I I CP Wave 0.3V 2.85V PU/HZ PU/HZ CP CP CP CP CP CP H H H H H H H H 1.86V ~ 2.14V Output current <3mA Input current <12uA VOLMAX=0.35V VOHMIN=VDD-0.35V 3%

Output current <10mA VILMAX=0.2V VIHMIN=0.7*VDD VILMAX=0.2V VIHMIN=0.7*VDD 220K PU to VBACKUP VOLMAX=0.35V VOHMIN=VDD-0.35V VILMAX=0.2V VIHMIN=0.7*VDD G610 GPRS Module Hardware User Manual Page 37 of 47 CTS_N Clear To Send DCD_N Data Carrier Detect O O CP CP L H PCM_DOUT General purpose I/O TR_INT Trace Interrupt Input SIM_VCC SIM_CLK SIM_DATA SIM_RST SIM_CD PCM_DIN PCM_FS PCM_CLK MIC-

MIC+

AUXI+

AUXI-

EAR-

EAR+

AUXO+

AUXO-

RF_ANT HS_DET ADC2 ADC1 SIM Interface (3.0V) SIM power SIM clock SIM data SIM reset SIM on site detect High level is on site O O I/O O I PCM audio / Trace (SPI) Trace data input Trace data output Trace clock output Audio 1st Audio channel (default) Balanced input 2nd Audio channel Balanced input 1st Audio channel (default) Balanced output 2nd Audio channel Balanced output Discrete RF antenna port Headset detect General purpose A/D General purpose A/D 0.3V T OD/PD 1.8V 2.85V 3.58MHz Wave T T CP CP CP CP CP 0V 0V 0V 0V 0V 0V OD OD T L L H H L H H 0V 2.85V 0V 0V 1.0V 0V 0V OD OD T 3%

Output current <10mA VOLMAX=0.35V VOHMIN=VSIM-0.35V VILMAX=0.2*VSIM VIHMIN=0.7*VSIM VOLMAX=0.35V VOHMIN=VDD-0.35V VILMAX=0.2 VIHMIN=0.7*VDD 0V ~ 1.000V 0V ~ 1.000V Extend voltage VOLMAX=0.35V I O O O I I I O O I I I/O I/O I SDA/GPIO19 I2C_SDA SCL/GPIO18 I2C_SCL GPIO07 General purpose IO 43 41 2 5 4 6 3 53 50 52 51 48 13 14 11 12 16 15 18 17 23 47 19 20 36 37 31 G610 GPRS Module Hardware User Manual Page 38 of 47 35 34 33 32 54 55 GPIO01 General purpose IO GPIO02 General purpose IO GPIO03 General purpose IO GPIO04 General purpose IO GPIO36 General purpose IO O O O O O T T T T CP T T T T H VOHMIN=VDD-0.35V VILMAX=0.2V VIHMIN=0.7*VDD NC 1. CP=Center Pin; T= 3 Status; PD= Pull Down; PU=Pull Up; OD=Open Drain 2. Description & I/O Standard Version G610 GPRS Module Hardware User Manual Page 39 of 47 5 Mechanical Design 5.1 G610 Mechanical Specifications G610 GPRS Module Hardware User Manual Page 40 of 47 5.2 Recommanded PCB layout:

G610 GPRS Module Hardware User Manual Page 41 of 47 5.3 Antenna Design The RF I/O Antenna signal is by default provided to 50 ohm antenna interface. In users main board, the Antenna layout should be design 50 ohm Microstrip Transmission Line. The Microstrip Transmission Line is better handled by PCB vendor. We also provide a sample 50 ohm unbalanced transmission system. The PCB parameters that affect impedance:

Track width (W) PCB substrate thickness (H) PCB substrate permittivity (r) To a lesser extent, PCB copper thickness (T) and proximity of same layer ground plane. Antenna characteristics are essential for good functionality of the module. The radiating performance of antennas has direct impact on the reliability of connection over the Air Interface. Bad termination of the antenna can result in poor performance of the module. G610 GPRS Module Hardware User Manual Page 42 of 47 The following parameters should be checked:

Item Impedance Frequency Range Input Power V.S.W.R Return Loss Gain Recommendations 50 Depends on the Mobile Network used. GSM900: 880~960 MHz GSM1800: 1710~1880 MHz GSM850: 824~894 MHz GSM1900: 1850~1990 MHz

>2 W peak

<2:1 recommended

<3:1 acceptable S11<-10 dB recommended, S11<-6 dB acceptable

<3 dBic Typically GSM antennas are available as:

Linear monopole: typical for fixed application. The antenna extends mostly as a linear element with a dimension comparable to lambda/4 of the lowest frequency of the operating band. Magnetic base may be available. Cable or direct RF connectors are common options. The integration normally requires the fulfillment of some minimum guidelines suggested by antenna manufacturer. Patch-like antenna: better suited for integration in compact designs (e.g. mobile phone). They are mostly custom designs where the exact definition of the PCB and product mechanical design is fundamental for tuning of antenna characteristics. For integration observe these recommendations:

Ensure 50 antenna termination minimize the V.S.W.R. or return loss, as this will optimize the electrical performance of the module. Select antenna with best radiating performance. If a cable is used to connect the antenna radiating element to application board, select a short cable with minimum insertion loss. The higher the additional insertion loss due to low quality or long cable, the lower the connectivity . Follow the recommendations of the antenna manufacturer for correct installation and deployment Do not include antenna within closed metal case. G610 GPRS Module Hardware User Manual Page 43 of 47 Do not place antenna in close vicinity to end user since the emitted radiation in human tissue is limited by S.A.R. regulatory requirements. Do not use directivity antenna since the electromagnetic field radiation intensity is limited in some countries. Take care of interaction between co-located RF systems since the GSM transmitted power may interact or disturb the performance of companion systems. Place antenna far from sensitive analog systems or employ countermeasures to reduce electromagnetic compatibility issues that may arise. The modules are designed to work on a 50 load. However, real antennas have no perfect 50 load on all the supported frequency bands. To reduce as much as possible performance degradation due to antenna mismatch, the following requirements should be met:

Measure the antenna termination with a network analyzer: connect the antenna through a coaxial cable to the measurement device, the |S11| indicates which portion of the power is delivered to antenna and which portion is reflected by the antenna back to the modem output. A good antenna should have a |S11| below -10 dB over the entire frequency band. Due to miniaturization, mechanical constraints and other design issues, this value will not be achieved. A value of |S11| of about -6 dB - (in the worst case) - is acceptable. 5.4 Reflow temperature profile G610 GPRS Module Hardware User Manual Page 44 of 47 6 Antenna Interface The RF interface of the G610 Module has an impedance of 50. The module is capable of sustaining a total mismatch at the antenna connector or pad without any damage, even when transmitting at maximum RF power. The external antenna must be matched properly to achieve best performance regarding radiated power, DC-power consumption, modulation accuracy and harmonic suppression. Antenna matching networks are not included on the G610 Module PCB and should be placed in the host application. Regarding the return loss, the Module provides the following values in the active band:

Table 6-1 Return Loss in the Active Band State of Module Return Loss of Recommended Return Module Receive Transmit 8dB not applicable Loss of Application 12dB 12dB The connection of the antenna or other equipment must be de coupled from DC voltage. This is necessary because the antenna connector is DC coupled to ground via an inductor for ESD protection. 6.1 Antenna Installation The G610 Module has no antenna connector, so antenna will be installed on the customer application board. 6.2 Antenna Subsystem The antenna sub-system and its design is a major part of the final product integration. Special attention and care should be taken in adhering to the following guidelines. 6.2.1 Antenna Specifications Choice of the antenna cable (type, length, performance, RF loss, etc) and antenna connector (type

+ losses) can have a major impact on the success of the design. 6.2.2 Cable Loss All cables have RF losses. Minimizing the length of the cable between the antenna and the RF connectors on the module will help obtain superior performance. High Quality/Low loss co-axial cables should be used to connect the antenna to the RF connectors. Contact the antenna vendor for the G610 GPRS Module Hardware User Manual Page 45 of 47 specific type of cable that interfaces with their antenna and ask them to detail the RF losses of the cables supplied along with the antenna. Typically, the cable length should be such that they have no more than 1-2dB of loss. Though the system will work with longer (lossy) cables, this will degrade GSM system performance. Care should also be taken to ensure that the cable end Connectors/terminations are well assembled to minimize losses and to offer a reliable, sturdy connection to the Module sub-system. This is particularly important for applications where the module is mounted on a mobile or portable environment where it is subject to shock and vibration. 6.2.3 Antenna Gain Maximum Requirements Our FCC Grant imposes a maximum gain for the antenna subsystem: 2 dBi for the GSM850 band and 2dBi for the 1900 band. Warning: Excessive gain could damage sensitive RF circuits and void the warranty. 6.2.4 Antenna Matching The modules RF connectors are designed to work with a 50-ohm subsystem. It is assumed that the antenna chosen has matching internal to it to match between the 50-ohm RF connectors and the antenna impedance. 6.2.5 PCB Design Considerations The antenna subsystem should be treated like any other RF system or component. It should be isolated as much as possible from any noise generating circuitry including the interface signals via filtering and shielding. As a general recommendation all components or chips operating at high frequencies such as micro controllers, memory, DC/DC converts and other RF components should not be placed too close to the module. When such cases exist, correct supply and ground de-coupling areas should be designed and validated. Avoid placing the components around the RF connection and close to the RF line between the RF antenna and the module. RF lines and cables should be as short as possible. If using coaxial cable it should not be placed close to devices operating at low frequencies. Signals like charger circuits may require some EMI/RFI decoupling such as filter capacitors or ferrite beads. Adding external impedance matching to improve the match to your cable and antenna assemblies is optional. Please contact the antenna vendor for matching requirements. For better ESD protection one can implement a shock coil to ground and place it close to the RF G610 GPRS Module Hardware User Manual Page 46 of 47 connector. G610 GPRS Module Hardware User Manual Page 47 of 47