Fibocom Wireless FIBOCOMG610 Wireless Communication Module User Manual GHT
Fibocom Wireless Inc. Wireless Communication Module GHT
manual
G610 GPRS Module
Hardware User Manual
Version: V1.0.2
Date: 2011-03-31
G610 GPRS Module Hardware User Manual Page 2 of 47
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 Date Remarks
V1.0.2 2011-03-31 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 3 of 47
Contents
1 Preface ................................................................................................................................................ 6
1.1 Manual Scope .......................................................................................................................... 6
1.2 Target Audience ....................................................................................................................... 6
1.3 Applicable Documents ............................................................................................................. 6
1.4 Standards ................................................................................................................................. 6
1.5 Regulatory Approvals ............................................................................................................... 7
1.6 FCC Notice to Users ................................................................................................................ 7
2 Introduction .......................................................................................................................................... 8
2.1 Product concept ....................................................................................................................... 8
2.2 Product Specifications .............................................................................................................. 9
3 Hardware Interface Description .........................................................................................................11
3.1 Architecture Overview .............................................................................................................11
3.1.1 Digital Block ..................................................................................................................11
3.1.2 Analog Block ................................................................................................................11
3.1.3 GSM Transceiver Block ............................................................................................... 12
3.2 Operating Modes .................................................................................................................... 12
3.3 Power Supply ......................................................................................................................... 13
3.3.1 Power Supply Design .................................................................................................. 13
3.3.2 Power Consumption .................................................................................................... 15
3.4 Power On/Off Operation ......................................................................................................... 16
3.4.1 Turning the G610 On ................................................................................................... 16
3.4.2 Turning the G610 Off ................................................................................................... 17
3.4.3 Turning the G610 Off Using AT Command ................................................................. 18
3.5 Sleep Mode ............................................................................................................................ 18
3.5.1 Activating Sleep Mode ................................................................................................ 19
3.5.2 Serial Interface during Sleep Mode ............................................................................. 19
3.5.3 Terminating Sleep Mode ............................................................................................. 20
3.6 Real Time Clock ..................................................................................................................... 22
3.6.1 VBACKUP description ................................................................................................. 22
3.6.2 RTC Application ........................................................................................................... 23
G610 GPRS Module Hardware User Manual Page 4 of 47
3.7 Serial Interfaces ..................................................................................................................... 23
3.7.1 Ring indicate ................................................................................................................ 24
3.7.2 DCD indicate ............................................................................................................... 25
3.8 SIM Interface .......................................................................................................................... 25
3.8.1 SIM Connection ........................................................................................................... 26
3.8.2 SIM Design Guidelines ................................................................................................ 26
3.8.3 SIM Detected feature .................................................................................................. 27
3.9 Audio Interface ....................................................................................................................... 27
3.9.1 1st Audio Channel: Microphone ................................................................................... 28
3.9.2 1st Audio Channel: Speaker ......................................................................................... 28
3.9.3 2nd Audio Channel: Microphone .................................................................................. 28
3.9.4 2nd Audio Channel: Speaker ........................................................................................ 29
3.9.5 Audio Design ............................................................................................................... 29
3.9.6 Switch Audio Channel by IO ........................................................................................ 30
3.10 A/D Interface .......................................................................................................................... 30
3.10.1 Power Supply ADC ...................................................................................................... 31
3.10.2 General Purpose ADC ................................................................................................. 31
3.11 Controls and Indicators Interface ........................................................................................... 31
3.11.1 VDD Reference Regulator .......................................................................................... 32
3.11.2 External Reset ............................................................................................................. 32
3.11.3 LPG ............................................................................................................................. 33
3.11.4 Trace Ports .................................................................................................................. 34
3.11.5 General Purpose I/O ................................................................................................... 35
4 Electrical and Environmental Specifications Absolute Maximum Ratings ........................................ 36
4.1 Electrical Specifications Absolute Maximum Ratings ............................................................ 36
4.2 Environmental Specifications Absolute Maximum Ratings .................................................... 36
4.3 Application Interface Specifications ....................................................................................... 36
5 Mechanical Design ............................................................................................................................ 40
5.1 G610 Mechanical Specifications ............................................................................................ 40
5.2 Recommanded PCB layout: ................................................................................................... 41
5.3 Antenna Design ...................................................................................................................... 42
5.4 Reflow temperature profile ..................................................................................................... 44
6 Antenna Interface .............................................................................................................................. 45
G610 GPRS Module Hardware User Manual Page 5 of 47
6.1 Antenna Installation ................................................................................................................ 45
6.2 Antenna Subsystem ............................................................................................................... 45
6.2.1 Antenna Specifications ................................................................................................ 45
6.2.2 Cable Loss .................................................................................................................. 45
6.2.3 Antenna Gain Maximum Requirements ...................................................................... 46
6.2.4 Antenna Matching ....................................................................................................... 46
6.2.5 PCB Design Considerations ........................................................................................ 46
Preface
G610 GPRS Module Hardware User Manual Page 6 of 47
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 Developer’s Kit
G610 GPRS Module Developer’s Kit User Manual
G610 GPRS Module Developer’s 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)
Preface
G610 GPRS Module Hardware User Manual Page 7 of 47
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 user’s 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,
with a statement similar to the following: For G610: This device contains FCC ID:
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 8 of 47
2 Introduction
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 9 of 47
2.2 Product Specifications
Product Features
Operating systems: Quad Band
GSM850/900/1800/1900 MHz
Physical Characteristics
Size: 31.4 x 20.2 x 3.0 mm
Mounting: SMT
Weight: 3.5 grams
Operational temperature: -40°C to +85°C
Storage temperature: -40°C to +85°C
Performance
Operating voltage: 3.3 – 4.5 V (4.0V is recommended)
Current consumption: 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
Tx power: 2 W, 850/900 MHz
1 W, 1800/1900 MHz
Rx sensitivity: 850/900MHz: -108dBm
1800/1900MHz: -107 dBm
Interfaces
SIM Card: External SIM connectivity
1.8V / 3.0 V
Serial Ports: UART:
BR from 1200 bps to 230400 bps
Auto BR from 1200 bps to 230400 bps
G610 GPRS Module Hardware User Manual Page 10 of 47
Data Features
GPRS: 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
CSD: Max BR 9.6 kbps
SMS: MO/MT Text and PDU modes
Cell broadcast
FAX Group3 Class 2 (TS 61/62)
Voice Features
Differential analog audio lines Two channel
Vocoders EFR/HR/FR/AMR
DTMF support
Audio control: Echo suppression, noise suppression, side tone and
gain control
Others
ADC Detect BATT voltage
Detect extend analog voltage
RTC inside
Flexible status indicator
Extend reset
G610 GPRS Module Hardware User Manual Page 11 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
Power management inside.
Internal regulators
Analog audio interface management.
General purpose dedicated A/D signals.
G610 GPRS Module Hardware User Manual Page 12 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.
Includes a harmonic filter and antenna switch
Filter - Dual-band SAW filter that selects the required receive band.
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.
The G610 is off.
Any signals connected to the interface
connector must be set low or tri-state.
Power off
Mode
Val
id BATT supply but not
power on.
After reset module. Vbackup
output and VDD is off.
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.
RTC Mode
Power off mode
BATT
supply is
disconnected. But valid
Vbackup supply
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.
Idle Mode
Power on is succeeded and
VDD output.
CTS_N and DSR_N signals
are enabled (low).
The G610 is fully active, registered to the
GSM/GPRS network and ready to
communicate.
This is the default power-on mode.
G610 GPRS Module Hardware User Manual Page 13 of 47
Sleep Mode CTS_N signal is wave.
The G610 is in low power mode.
The application interfaces are disabled, but,
G610 continues to monitor the GSM
network.
Call or CSD call
or GPRS data LPG signal is toggling.
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
26
BATT
DC power supply.
BATT = 3.3 V to 4.5 V
4.0V is recommended
27
1
GND Ground
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 14 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.
It is recommended that the voltage drops during a transmit burst will not exceed 300mV,
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
Capacitor Usage Description
1000 uF GSM Transmit current serge
Minimizes power supply losses
during transmit bursts. Use maximum
possible value.
10 nF, 100 nF Digital switching noise Filters digital logic noises from clocks
and data sources.
300mV max
3.3V min
BATT
TX_EN
G610 GPRS Module Hardware User Manual Page 15 of 47
8.2 pF, 10 pF 1800/1900 MHz GSM bands Filters transmission EMI.
33 pF, 39 pF 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 25°C
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 80 90 µA
I idle Idle mode
GSM only, DRX=2,
-85dBm
GSM850/900
DSC/PCS
24
mA
I sleep Low power mode
DRX=2 3.6
mA 5 2.0
9 1.6
I gsm-avg
Average current
GSM voice
1 TX slot 1 Rx slot
GSM850/900
PCL=5
260
mA
10 150
15 115
19 110
DCS/PCS PCL=0 230
5 140
10 115
15 110
I gsm-max Average current
GSM voice
GSM850/900
PCL=5
1800
2000 mA
G610 GPRS Module Hardware User Manual Page 16 of 47
1 TX slot 1 Rx slot 19 300
DCS/PCS PCL=0 1400
15 300
I gprs-avg
Average current
GPRS Class 10
2 TX slot 2 Rx slot
GSM850/900
PCL=5
420
mA
19 150
DCS/PCS PCL=0 380
15 150
3.4 Power On/Off Operation
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 POWER_ON Power on and off module
Low level activated
9 VDD
Illustrating module start up
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 17 of 47
The figure illustrates the G610 power on is succeeded.
The figure illustrates the G610 power on is failed.
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
VDD
POWER_ON
VDD
POWER_ON
G610 GPRS Module Hardware User Manual Page 18 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.
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 (VBAT≤3.2V). 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
VDD
POWER_ON
Turn off failed
G610 GPRS Module Hardware User Manual Page 19 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.
3.5.2 Serial Interface during Sleep Mode
The G610 wakes up periodically from Sleep mode to page the GSM network for any incoming
RXD
CTS
ATS24=1 return OK
HIGH: disable, Sleep Mode
LOW: enable, Idle Mode
G610 GPRS Module Hardware User Manual Page 20 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.
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.
CTS
(DRX=2)
G610 GPRS Module Hardware User Manual Page 21 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.
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
RXD
CTS
ATS24=1
G610 GPRS Module Hardware User Manual Page 22 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 23 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 Description Feature Direction
45 RXD_N Module
Transmitted Data
DTE
Received Data DCE→DTE
44 TXD_N Module
Received Data
DTE
Transmitted Data DTE→DCE
39 RING_N Module
Ring indicator
Notice DTE Remote
Call DCE→DTE
38 DSR_N Module
Data Set Ready DCE Was Ready DCE→DTE
G610 GPRS Module Hardware User Manual Page 24 of 47
42 RTS_N Request To Send DTE Notice DCE
Requested To Send DTE→DCE
40 DTR_N Data Terminal Ready DTE Was Ready DTE→DCE
43 CTS_N Module
Clear To Send
DCE Switch To
Received Mode DCE→DTE
41 DCD_N Data Carrier Detect Data Carrier Was
Online DCE→DTE
The recommended connection was seeing as below.
Application MCU G610 Module
RXD Pin 45 RXD_N
TXD Pin 44 TXD_N
RI Pin 39 RING_N
DSR Pin 38 DSR_N
RTS Pin 42 RTS_N
DTR Pin 40 DTR_N
CTS Pin 43 CTS_N
DCD Pin 41 DCD_N
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 25 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 26 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 SIM_CLK Serial 3.25 MHz clock
2 SIM_VCC 2.85V Supply to the SIM
4 SIM_DATA Serial input and output data
6 SIM_RST Active low SIM reset signal
3 SIM_CD 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 27 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 MIC- 1st Audio channel
Balanced microphone input
14 MIC+
11 AUXI+ 2nd Audio channel
Balanced microphone input
12 AUXI-
G610 GPRS Module Hardware User Manual Page 28 of 47
16 EAR- 1st Audio channel
Output is balanced and can directly operate an head set
15 EAR+
18 AUXO+ 2nd Audio channel
Output is balanced and can directly operate an hand
free speaker
17 AUXO-
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 kΩ.
The bias voltage would be supplied after a voice call establish.
Parameter Conditions Min Typ Max Unit
Bias Voltage No load 1.8 2.0 2.2 V
Gain Programmable
in 3 dB steps
0 45 dB
AC Input
Impedance
2 kΩ
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 32Ω impedance.
Parameter Conditions Min Typ Max Unit
Output Voltage No load Single
ended
200 mVPP
AC Output
Impedance
32 Ω
DC Voltage 1.38 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 29 of 47
command. It has an impedance of 2 kΩ.
The bias voltage would be supplied after G610 powered on.
Parameter Conditions Min Typ Max Unit
Bias Voltage No load 2.5 V
Gain Programmable
in 3 dB steps
0 45 dB
AC Input
Impedance
2 kΩ
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 8Ω speaker directly.
Parameter Conditions Min Typ Max Unit
Output Voltage No load Single
ended
500 mVPP
AC Output
Impedance
8 Ω
DC Voltage 1.38 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 30 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
1st channel is activated.
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
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 31 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 Min Typ Max Unit
Supply Range Operating range 3.20 4.50 V
Resolution 1.0 %
Sampling Time 16 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 ADC2 General purpose ADC
20 ADC1 General purpose ADC
Parameter Conditions Min Typ Max Unit
Input Voltage Operating range 0 1.00 V
Resolution 0.5 %
Sampling Time 16 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 32 of 47
G610 Pin# G610 Signal name Description
9 VDD LDO power output
Illustrating module start up
49 LPG Module work status indicator
7 RESET_N Extend reset module
Low level activated
3.11.1 VDD Reference Regulator
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 Conditions Min Typ Max Unit
Vout Iout=30mA -3% 2.85 3% V
Iout 10 30 mA
Imax
Current pulled down from LDO
to GND until LDO voltage is
50% of nominal value
150 mA
External
Capacitor -35% 1 35% uF
PSRR 50 Hz - 20 kHz 35 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: It’s recommended that it should connect he 1nF capacitor to GND on external
G610 GPRS Module Hardware User Manual Page 33 of 47
circuit.
Parameter Conditions Min Typ Max Unit
T width 100 200 400 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 G610 is in one of the following modes:
• Power off mode
• SLEEP mode
600 ms on / 600 ms off G610 is in one of the following status:
• NO SIM card
• SIM PIN
• Register network (T<15S)
• Register network failure (always)
3 s on / 75 ms off G610 is in one of the following status:
• IDLE mode
75 ms on / 75 ms off G610 is in one of the following status:
• One or more GPRS contexts activated.
Permanently on G610 is in one of the following status:
• Voice call
• CSD or FAX call
G610 GPRS Module Hardware User Manual Page 34 of 47
When the G610 POWER ON , the LPG timing see as below:
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: It’s recommend that reserved these ports and connected to a socket in any
design.
G610 Pin# G610 Signal name Description
53 PCM_DIN
TR_MISO Trace data input
50 PCM_FS
TR_MOSI Trace data output
52 PCM_CLK
TR_CLK Trace clock output
51 PCM_DOUT
TR_CS General purpose I/O
48 TR_INT Trace Interrupt Input
POWER_ON Register network IDLE mode
G610 GPRS Module Hardware User Manual Page 35 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 GPIO01 Bit1
34 GPIO02 Bit2
33 GPIO03 Bit3
32 GPIO04 Bit4
37 SCL/GPIO18 Bit5
36 SDA/GPIO19 Bit6
31 GPIO07 Bit7
54 GPIO36 Bit8
G610 GPRS Module Hardware User Manual Page 36 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.
Parameter Conditions Min Max Unit
BATT Supply -0.2 4.5 V
Digital Input Signals G610 powered on
VDD Domain
-0.2 3.3 V
Analog Input Signals
(Audio, A/D interfaces)
G610 powered on -0.2 2.75 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.
Parameter Conditions Min Max Unit
Ambient Operating
Temperature
-40 85 °C
Storage Temperature -40 85 °C
ESD At antenna port
Contact
± 4 KV
Air At plane ± 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 37 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
Power
26 BATT DC power supply I 3.3V ~ 4.5V
27
1
GND Ground
21
22
24
25
28
46
8 VBACKUP Real time clock power I/O 2.0V 2.0V
1.86V ~ 2.14V
Output current <3mA
Input current <12uA
29 CHARG_CDT Charge power detect signal
High level activated I PD L
30 CHARG_CS Charge switch control
Extend transistor I OC/PD L
Control & Status
49 LPG Work mode indicator O CP Wave VOLMAX=0.35V
VOHMIN=VDD-0.35V
9 VDD LDO power output
Illustrating start up O 0.3V 2.85V ±3%
Output current <10mA
7 RESET_N Extend reset**
Low level activated I PU/HZ H VILMAX=0.2V
VIHMIN=0.7*VDD
10 POWER_ON Turn on module
Low level activated I PU/HZ H
VILMAX=0.2V
VIHMIN=0.7*VDD
220K PU to VBACKUP
Uart (Modem DCE)
45 RXD_N Received Data O CP H
VOLMAX=0.35V
VOHMIN=VDD-0.35V
VILMAX=0.2V
VIHMIN=0.7*VDD
44 TXD_N Transmitted Data I CP H
39 RING_N Ring indicator O CP H
38 DSR_N Data Set Ready O CP H
42 RTS_N Request To Send I CP H
40 DTR_N Data Terminal Ready I CP H
G610 GPRS Module Hardware User Manual Page 38 of 47
43 CTS_N Clear To Send O CP L
41 DCD_N Data Carrier Detect O CP H
SIM Interface (3.0V)
2 SIM_VCC SIM power O 0.3V 1.8V
2.85V
±3%
Output current <10mA
5 SIM_CLK SIM clock O T 3.58MHz
VOLMAX=0.35V
VOHMIN=VSIM-0.35V
VILMAX=0.2*VSIM
VIHMIN=0.7*VSIM
4 SIM_DATA SIM data I/O OD/PD Wave
6 SIM_RST SIM reset O T L
3 SIM_CD
SIM on site detect
High level is on site
I T L
PCM audio / Trace (SPI)
53 PCM_DIN Trace data input I CP H
VOLMAX=0.35V
VOHMIN=VDD-0.35V
VILMAX=0.2
VIHMIN=0.7*VDD
50 PCM_FS Trace data output O CP H
52 PCM_CLK Trace clock output O CP L
51 PCM_DOUT General purpose I/O O CP H
48 TR_INT Trace Interrupt Input I CP H
Audio
13 MIC- 1st Audio channel (default)
Balanced input I 0V 0V
14 MIC+
11 AUXI+ 2nd Audio channel
Balanced input I 0V 2.85V
12 AUXI- 0V
16 EAR- 1st Audio channel (default)
Balanced output O 0V 0V
15 EAR+
18 AUXO+ 2nd Audio channel
Balanced output O 0V 1.0V
17 AUXO-
Discrete
23 RF_ANT RF antenna port
47 HS_DET Headset detect
19 ADC2 General purpose A/D I 0V 0V 0V ~ 1.000V
20 ADC1 General purpose A/D I 0V 0V 0V ~ 1.000V
36 SDA/GPIO19 I2C_SDA I/O OD OD
Extend voltage
37 SCL/GPIO18 I2C_SCL I/O OD OD
31 GPIO07 General purpose IO I T T VOLMAX=0.35V
G610 GPRS Module Hardware User Manual Page 39 of 47
35 GPIO01 General purpose IO O T T VOHMIN=VDD-0.35V
VILMAX=0.2V
VIHMIN=0.7*VDD
34 GPIO02 General purpose IO O T T
33 GPIO03 General purpose IO O T T
32 GPIO04 General purpose IO O T T
54 GPIO36 General purpose IO O CP H
55 NC
注：
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 40 of 47
5 Mechanical Design
5.1 G610 Mechanical Specifications
G610 GPRS Module Hardware User Manual Page 41 of 47
5.2 Recommanded PCB layout:
G610 GPRS Module Hardware User Manual Page 42 of 47
5.3 Antenna Design
The RF I/O Antenna signal is by default provided to 50 ohm antenna interface. In user’s 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 (εr)
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 43 of 47
The following parameters should be checked:
Item Recommendations
Impedance 50 Ω
Frequency
Range
Depends on the Mobile Network used.
GSM900: 880~960 MHz
GSM1800: 1710~1880 MHz
GSM850: 824~894 MHz
GSM1900: 1850~1990 MHz
Input Power >2 W peak
V.S.W.R <2:1 recommended
<3:1 acceptable
Return Loss S11<-10 dB recommended,
S11<-6 dB acceptable
Gain <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 Ω 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 44 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 Ω load. However, real antennas have no perfect 50
Ω 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 45 of 47
6 Antenna Interface
The RF interface of the G610 Module has an impedance of 50Ω. 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
Module
Recommended Return
Loss of
Application
Receive ≥ 8dB ≥ 12dB
Transmit not applicable ≥ 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 46 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 module’s 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 47 of 47
connector.