Hardware Design
SIM340_HD_V3.09
SIM340 Hardware Design
Document Title:
Version:
Date:
Status:
Document Control ID:
SIM340 Hardware Design
3.09
2009-3-18
Release
SIM340_HD_V3.09
General Notes
SIMCom offers this information as a service to its customers, to support application and
engineering efforts that use the products designed by SIMCom. The information provided is
based upon requirements specifically provided to SIMCom by the customers. SIMCom has
not undertaken any independent search for additional relevant information, including any
information that may be in the customer’s possession. Furthermore, system validation of this
product designed by SIMCom within a larger electronic system remains the responsibility of
the customer or the customer’s system integrator. All specifications supplied herein are
subject to change.
Copyright
This document contains proprietary technical information which is the property of SIMCom
Limited., copying of this document and giving it to others and the using or communication of
the contents thereof, are forbidden without express authority. Offenders are liable to the
payment of damages. All rights reserved in the event of grant of a patent or the registration of
a utility model or design. All specification supplied herein are subject to change without
notice at any time.
Copyright © Shanghai SIMCom Wireless Solutions Ltd. 2009
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SIM340 Hardware Design
Contents
Contents ............................................................................................................................................3
Version history..................................................................................................................................7
1 Introduction....................................................................................................................................9
1.1 Related documents ...............................................................................................................9
1.2 Terms and abbreviations.....................................................................................................10
2 SIM340 overview.........................................................................................................................13
2.1 SIM340 key features ..........................................................................................................14
2.2 SIM340 functional diagram ...............................................................................................15
2.3 SIM340 evaluation board...................................................................................................16
3 Application interface....................................................................................................................18
3.1 SIM340 pin description ......................................................................................................18
3.2 Operating modes ................................................................................................................21
3.3 Power supply ......................................................................................................................22
3.3.1 Power supply pins on the board-to-board connector................................................24
3.3.2 Minimizing power losses..........................................................................................24
3.3.3 Monitoring power supply .........................................................................................24
3.4 Power up and power down scenarios .................................................................................24
3.4.1 Turn on SIM340 .......................................................................................................24
3.4.2 Turn off SIM340 ......................................................................................................27
3.4.3 Restart SIM340 using the PWRKEY pin .................................................................29
3.5 Power saving ......................................................................................................................30
3.5.1 Minimum functionality mode...................................................................................30
3.5.2 Sleep mode (slow clock mode).................................................................................31
3.5.3 Wake up SIM340 from SLEEP mode ......................................................................31
3.6 Summary of state transitions (except SLEEP mode) .........................................................31
3.7 RTC backup........................................................................................................................32
3.8 Serial interfaces..................................................................................................................35
3.8.1 Function of serial port & debug port supporting......................................................36
3.8.2 Software upgrade and software debug......................................................................37
3.9 Audio interfaces .................................................................................................................39
3.9.1 Speaker interface configuration................................................................................40
3.9.2 Microphone interfaces configuration........................................................................41
3.9.3 Earphone interface configuration .............................................................................41
3.9.4 Referenced electronic characteristic.........................................................................42
3.10 Buzzer ..............................................................................................................................43
3.11 SIM card interface............................................................................................................43
3.11.1 SIM card application ..............................................................................................43
3.11.2 Design considerations for SIM card holder............................................................45
3.12 LCD display interface ......................................................................................................48
3.13 Keypad interface ..............................................................................................................48
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3.14 ADC .................................................................................................................................49
3.15 Behaviors of the RI ..........................................................................................................50
3.16 Network status indication.................................................................................................51
3.17 General purpose input & output (GPIO) ..........................................................................52
4 Antenna interface .........................................................................................................................53
4.1 Antenna installation............................................................................................................53
4.1.1 Antenna connector....................................................................................................53
4.1.2 Antenna pad..............................................................................................................53
Module RF output power .........................................................................................................53
4.2 Module RF receive sensitivity............................................................................................54
4.3 Module operating frequencies............................................................................................54
5 Electrical, reliability and radio characteristics .............................................................................55
5.1 Absolute maximum ratings.................................................................................................55
5.2 Operating temperatures ......................................................................................................55
5.3 Power supply ratings ..........................................................................................................56
5.4 Current consumption..........................................................................................................57
5.5 Electro-Static discharge......................................................................................................58
6 Product information .....................................................................................................................59
7 Mechanics ....................................................................................................................................60
7.1 Mechanical dimensions of SIM340....................................................................................60
7.2 Mounting SIM340 onto the application platform...............................................................61
7.3 Board-to-board connector ..................................................................................................61
7.3.1 Mechanical dimensions of the ENTERY 1008-G60N-01R .....................................62
7.3.2 Mechanical dimensions of the JXT 210-106001-001...............................................63
7.4 RF adapter cabling .............................................................................................................65
7.5 Top view of the SIM340.....................................................................................................67
7.6 PIN assignment of board-to-board connector of SIM340..................................................68
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SIM340 Hardware Design
Table Index
TABLE 1: RELATED DOCUMENTS..................................................................................................... 9
TABLE 2: TERMS AND ABBREVIATIONS .......................................................................................10
TABLE 3: SIM340 KEY FEATURES....................................................................................................14
TABLE 4: CODING SCHEMES AND MAXIMUM NET DATA RATES OVER AIR INTERFACE..15
TABLE 5: BOARD-TO-BOARD CONNECTOR PIN DESCRIPTION ...............................................18
TABLE 6: OVERVIEW OF OPERATING MODES..............................................................................21
TABLE 7: AT COMMANDS USED IN ALARM MODE .....................................................................27
TABLE 8: SUMMARY OF STATE TRANSITIONS.............................................................................31
TABLE 9: PIN DEFINITION OF THE SERIAL INTERFACES ..........................................................35
TABLE 10: LOGIC LEVELS OF THE SERIAL PORT AND DEBUG PORT .....................................35
TABLE 11: PIN DEFINITION OF THE AUDIO INTERFACE............................................................39
TABLE 12: MIC INPUT CHARACTERISTICS...................................................................................42
TABLE 13: AUDIO OUTPUT CHARACTERISTICS..........................................................................42
TABLE 14: BUZZER OUTPUT CHARACTERISTICS .......................................................................43
TABLE 15: PIN DEFINITION OF THE SIM INTERFACE .................................................................44
TABLE 16: PIN DESCRIPTION (AMPHENOL SIM CARD HOLDER) ............................................46
TABLE 17: PIN DESCRIPTION (MOLEX SIM CARD HOLDER) .................................................... 47
TABLE 18: PIN DEFINITION OF THE LCD INTERFACE ................................................................48
TABLE 19: PIN DEFINITION OF THE KEYPAD INTERFACE ........................................................48
TABLE 20: ADC SPECIFICATION ......................................................................................................49
TABLE 21: BEHAVIOURS OF THE RI................................................................................................50
TABLE 22: WORKING STATE OF THE NETLIGHT .........................................................................51
TABLE 23: PIN DEFINITION OF THE GPIO INTERFACE ...............................................................52
TABLE 24: SIM340 CONDUCTED RF OUTPUT POWER................................................................. 53
TABLE 25: SIM340 CONDUCTED RF RECEIVE SENSITIVITY ..................................................... 54
TABLE 26: SIM340 OPERATING FREQUENCIES ............................................................................54
TABLE 27: ABSOLUTE MAXIMUM RATINGS.................................................................................55
TABLE 28: SIM340 OPERATING TEMPERATURE ........................................................................... 55
TABLE 29: SIM340 POWER SUPPLY RATINGS ...............................................................................56
TABLE 30: SIM340 CURRENT CONSUMPTION ..............................................................................57
TABLE 31: THE ESD ENDURE STATUE MEASURED TABLE (TEMPERATURE: 25℃,
HUMIDITY: 45% ) ........................................................................................................................ 58
TABLE 32: ORDERING INFORMATION ........................................................................................... 59
TABLE 33: CONNECTION DIAGRAMS ............................................................................................68
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SIM340 Hardware Design
Figure Index
FIGURE 1: SIM340 FUNCTIONAL DIAGRAM .................................................................................16
FIGURE 2: TOP VIEW OF SIM300 EVB .............................................................................................17
FIGURE 3: REFERENCE CIRCUIT OF THE VBAT INPUT ..............................................................23
FIGURE 4: REFERENCE CIRCUIT OF THE SOURCE POWER SUPPLY INPUT...........................23
FIGURE 5: VBAT VOLTAGE DROP DURING TRANSMIT BURST ................................................24
FIGURE 6: TURN ON SIM340 USING DRIVING CIRCUIT ............................................................. 25
FIGURE 7: TURN ON SIM340 USING BUTTON...............................................................................25
FIGURE 8: TIMING OF TURN ON SYSTEM .....................................................................................26
FIGURE 9: TIMING OF TURN OFF SYSTEM ...................................................................................28
FIGURE 10: TIMING OF RESTART SYSTEM ...................................................................................30
FIGURE 11: RTC SUPPLY FROM NON-CHARGEABLE BATTERY ...............................................32
FIGURE 12: RTC SUPPLY FROM RECHARGEABLE BATTERY .................................................... 32
FIGURE 13: RTC SUPPLY FROM CAPACITOR ................................................................................33
FIGURE 14: PANASONIC EECEMOE204A CHARGE CHARACTERISTIC ...................................33
FIGURE 15: MAXELL TC614 CHARGE CHARACTERISTIC.......................................................... 34
FIGURE 16: SEIKO TS621 CHARGE CHARACTERISTIC............................................................... 34
FIGURE 17: CONNECTION OF THE SERIAL INTERFACES ..........................................................36
FIGURE 18: CONNECTION OF SOFTWARE UPGRADE.................................................................38
FIGURE 19: CONNECTION OF SOFTWARE DEBUG......................................................................38
FIGURE 20: RS232 LEVEL CONVERTER CIRCUIT ......................................................................... 38
FIGURE 21: SPEAKER INTERFACE CONFIGURATION .................................................................40
FIGURE 22: SPEAKER INTERFACE WITH AMPLIFIER CONFIGURATION ................................40
FIGURE 23: MICROPHONE INTERFACE CONFIGURATION ........................................................41
FIGURE 24: EARPHONE INTERFACE CONFIGURATION..............................................................41
FIGURE 25: REFERENCE CIRCUIT OF BUZZER ............................................................................ 43
FIGURE 26: REFERENCE CIRCUIT OF THE 8 PINS SIM CARD....................................................45
FIGURE 27: REFERENCE CIRCUIT OF THE 6 PINS SIM CARD....................................................45
FIGURE 28: AMPHENOL C707 10M006 512 2 SIM CARD HOLDER.............................................. 46
FIGURE 29: MOLEX 91228 SIM CARD HOLDER ............................................................................47
FIGURE 30: REFERENCE CIRCUIT OF THE KEYPAD INTERFACE............................................. 49
FIGURE 31: SIM340 SERVICES AS RECEIVER................................................................................ 50
FIGURE 32: SIM340 SERVICES AS CALLER.................................................................................... 51
FIGURE 33: REFERENCE CIRCUIT OF NETLIGHT ........................................................................51
FIGURE 34: MECHANICAL DIMENSIONS OF MODULE（UNIT: MM） .................................... 60
FIGURE 35: MECHANICAL DIMENSIONS OF MODULE PCB DECAL（UNIT: MM）..............61
FIGURE 36: ENTERY 1008-G60N-01R BOARD-TO-BOARD CONNECTOR .................................62
FIGURE 37: JXT 210-106001-001 BOARD-TO-BOARD CONNECTOR ..........................................63
FIGURE 38: BOARD-TO-BOARD CONNECTOR PHYSICAL PHOTO ...........................................64
FIGURE 39: MM9329-2700B................................................................................................................ 65
FIGURE 40: RF CONNECTOR MXTK................................................................................................66
FIGURE 41: TOP VIEW OF THE SIM340 ...........................................................................................67
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SIM340 Hardware Design
Version history
Date Version Description of change Author
2005-04-13 01.00 Origin anthony
2005-06-29 01.01 Modify the RESET pin DC characteristics etc anthony
2005-08-02 01.02 Modify the ESD characteristics etc anthony
2005-08-23 01.03 Delete reset part, update mechanical dimensions, sleep
mode and board-to-board connector description
2005-11-02 01.04 Add the SIM340 current consumption, modify the
Buzzer pin
anthony
anthony
2005-11-22 01.05 Add the restart timing figure anthony
2005-12-27 01.06 Add the Software upgrade, the auto-baud and the over
temperature power off
Modify the sleep mode control and the SIM card
anthony
detection
2006-02-22 01.07 Modify the figure 3,4,5,20,28 and add the figure 14 anthony
2006-03-16 02.01 Modify for SIM340_V7.02
Add support GPRS class 8, Modify the VDD_EXT
level, “RDY” out by set fixed baudrate, timing of the
anthony
turning on system
2006-04-04 02.02 Modify the function of GPIO5 and BUZZER pins, the
10K resistance integrated in the VRTC pin.
anthony
Add the description of the Autobauding function
2006-05-09 02.03 Update Temperature range
Modify the mechanical dimensions of SIM340
Delete the description of MOLEX connector
anthony
Modify the figure of the SIM reference circuit
2006-6-10 03.01 Update the figure of SIM card holder anthony
2006-7-27 03.02 Add the note about the VRTC pin
Add the note about the configuration be set and saved
anthony
as the fix baud rate
2006-8-30 03.03 Delete the chapter of antenna gain
Modify the figure of the timing of turning on system
Modify the figure of the timing of turning off system
Modify the high voltage and low voltage of the
anthony
PWRKEY
Modify the PIN name
2006-11-09 03.04 Modify the audio output characteristics anthony
2007-01-09 03.05 Modify the SIM340 key features anthony
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SIM340 Hardware Design
Modify the overview of operating modes
Modify the MIC input characteristics
Modify the BUZZER & NETLIGHT reference circuit
Add the note in the chapter of the Serial Interfaces
about RTS connected to GND
2007-07-31 03.06 Modify the current of VDD_EXT to 10mA.
Modify the range of autobauding as 4800-115200bps.
Add the function of over-voltage automatic shutdown.
Add the chapter 2.2, the chapter 2.3, the chapter 3.13,
the chapter 6.3.2 (add the description of JXT
210-106001-001 connector).
Anthony.Yang
Add the figure 1, 2, 4, 6, 7, 20, 30, 35, 38 and the table
9, 19.
Modify the figure 9: Timing of turning off system
(pulldown time of the PWRKEY from 1s-2s to 2s-3s),
figure 5, figure 10, and table 20: ADC specification.
2007-09-05 03.07 Add order information
Add why we used SIM340 on SIM300-EVB.
2007-10-26 03.08 Modify the figure 9: Timing of turning off system
(pulldown time of the PWRKEY from 2s-3s to
0.5s-1s)
Add notes about Restricted operation
2008-03-13 03.09 Firmware upgrade to R16 platform.
Add AMR Speech codec mode and delete ECHO
suppression in the audio feature column.
Modify the duration of DTR low level that wakes up
the module from sleep mode.
Modify the behaviours of RI.
Modify RF connector type MM9329-2700B to
MM9329-2700RA1
Add notes that LCD display interface function is
option.
Add notes that keypad interface function is option.
Add notes that GPIO0 function is option.
2009-3-18 03.09 Modify Figure 1: delete ghost KROW4 key.
chenbo
anyong
Lvning
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SIM340 Hardware Design
1 Introduction
This document describes the hardware interface of the SIMCom SIM340 module that connects to
the specific application and the air interface. As SIM340 can be integrated with a wide range of
applications, all functional components of SIM340 are described in great detail.
This document can help you quickly understand SIM340 interface specifications, electrical and
mechanical details. With the help of this document and other SIM340 application notes, user guide,
you can use SIM340 module to design and set-up mobile applications quickly.
1.1 Related documents
Table 1: Related documents
SN Document name Remark
[1] SIM300_ATC SIM300_ATC
[2] ITU-T Draft new
recommendation
V.25ter:
[3] GSM 07.07: Digital cellular telecommunications (Phase 2+); AT command
[4] GSM 07.10: Support GSM 07.10 multiplexing protocol
[5] GSM 07.05: Digital cellular telecommunications (Phase 2+); Use of Data
[6] GSM 11.14: Digital cellular telecommunications system (Phase 2+);
[7] GSM 11.11: Digital cellular telecommunications system (Phase 2+);
[8] GSM 03.38: Digital cellular telecommunications system (Phase 2+);
Serial asynchronous automatic dialing and control
set for GSM Mobile Equipment (ME)
Terminal Equipment – Data Circuit terminating Equipment
(DTE – DCE) interface for Short Message Service (SMS) and
Cell Broadcast Service (CBS)
Specification of the SIM Application Toolkit for the Subscriber
Identity Module – Mobile Equipment (SIM – ME) interface
Specification of the Subscriber Identity Module – Mobile
Equipment (SIM – ME) interface
Alphabets and language-specific information
[9] GSM 11.10 Digital cellular telecommunications system (Phase 2) ；
Mobile Station (MS) conformance specification； Part 1:
Conformance specification
[10] AN_SerialPort AN_SerialPort
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SIM340 Hardware Design
1.2 Terms and abbreviations
Table 2: Terms and abbreviations
Abbreviation Description
ADC Analog-to-Digital Converter
ARP Antenna Reference Point
ASIC Application Specific Integrated Circuit
BER Bit Error Rate
BTS Base Transceiver Station
CHAP Challenge Handshake Authentication Protocol
CS Coding Scheme
CSD Circuit Switched Data
CTS Clear to Send
DAC Digital-to-Analog Converter
DRX Discontinuous Reception
DSP Digital Signal Processor
DTE Data Terminal Equipment (typically computer, terminal, printer)
DTR Data Terminal Ready
DTX Discontinuous Transmission
EFR Enhanced Full Rate
EGSM Enhanced GSM
EMC Electromagnetic Compatibility
ESD Electrostatic Discharge
ETS European Telecommunication Standard
FCC Federal Communications Commission (U.S.)
FDMA Frequency Division Multiple Access
FR Full Rate
GMSK Gaussian Minimum Shift Keying
GPRS General Packet Radio Service
GSM Global Standard for Mobile Communications
HR Half Rate
I/O Input/Output
IC Integrated Circuit
IMEI International Mobile Equipment Identity
Inorm Normal Current
Imax Maximum Load Current
kbps Kilo bits per second
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Abbreviation Description
LED Light Emitting Diode
Li-Ion Lithium-Ion
MO Mobile Originated
MS Mobile Station (GSM engine), also referred to as TE
MT Mobile Terminated
PAP Password Authentication Protocol
PBCCH Packet Switched Broadcast Control Channel
PCB Printed Circuit Board
PCS Personal Communication System, also referred to as GSM 1900
PDU Protocol Data Unit
PPP Point-to-point protocol
RF Radio Frequency
RMS Root Mean Square (value)
RTC Real Time Clock
Rx Receive Direction
SIM Subscriber Identification Module
SMS Short Message Service
TDMA Time Division Multiple Access
TE Terminal Equipment, also referred to as DTE
TX Transmit Direction
UART Universal Asynchronous Receiver & Transmitter
URC Unsolicited Result Code
USSD Unstructured Supplementary Service Data
VSWR Voltage Standing Wave Ratio
Vmax Maximum Voltage Value
Vnorm Normal Voltage Value
Vmin Minimum Voltage Value
VIHmax Maximum Input High Level Voltage Value
VIHmin Minimum Input High Level Voltage Value
VILmax Maximum Input Low Level Voltage Value
VILmin Minimum Input Low Level Voltage Value
Vima x Absolute Maximum Input Voltage Value
Vimi n Absolute Minimum Input Voltage Value
VOHmax Maximum Output High Level Voltage Value
VOHmin Minimum Output High Level Voltage Value
VOLmax Maximum Output Low Level Voltage Value
VOLmin Minimum Output Low Level Voltage Value
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SIM340 Hardware Design
Phonebook abbreviations
Abbreviation Description
FD SIM fix dialing phonebook
LD SIM last dialing phonebook (list of numbers most recently dialed)
MC Mobile Equipment list of unanswered MT calls (missed calls)
ON SIM (or ME) own numbers (MSISDNs) list
RC Mobile Equipment list of received calls
SM SIM phonebook
NC Not connect
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SIM340 Hardware Design
2 SIM340 overview
Designed for global market, SIM340 is a Quad –band GSM/GPRS engine that works on
frequencies GSM 850 MHZ, EGSM 900 MHz, DCS 1800 MHz and PCS 1900 MHz. SIM340
features GPRS multi-slot class 10/ class 8 (optional) and supports the GPRS coding schemes CS-1,
CS-2, CS-3 and CS-4.
With a tiny configuration of 40mm x 33mm x 2.9mm , SIM340 can meet almost all the space
requirements in your applications, such as smart phone, PDA phone and other mobile devices.
The physical interface to the mobile application is a 60-pin board-to-board connector, which
provides all hardware interfaces between the module and customers’ boards except the RF antenna
interface.
The keypad and SPI display interface will give you the flexibility to develop customized
applications.
Serial port and Debug port can help you easily develop your applications.
Two audio channels include two microphones inputs and two speakers’ outputs. This can be easily
configured by AT command.
The SIM340 provides RF antenna interface with alternatives: antenna connector and antenna pad.
The antenna connector is MURATA MM9329-2700. And customer’s antenna can be soldered to
the antenna pad.
The SIM340 is designed with power saving technique; so that the current consumption is as low as
2.5mA in SLEEP mode.
The SIM340 is integrated with the TCP/IP protocol; extended TCP/IP AT commands are
developed for customers to use the TCP/IP protocol easily, which is very useful for those data
transfer applications.
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SIM340 Hardware Design
2.1 SIM340 key features
Table 3: SIM340 key features
Feature Implementation
Power supply Single supply voltage 3.4V – 4.5V
Power saving Typical power consumption in SLEEP mode to 2.5mA
( BS-PA-MFRMS=5 )
Frequency Bands
SIM340 Quad-band: GSM 850, EGSM 900, DCS 1800, PCS 1900.
The SIM340 can search the 4 frequency bands automatically. The
frequency bands also can be set by AT command.
Compliant to GSM Phase 2/2+
GSM class Small MS
Transmitting power Class 4 (2W) at GSM 850 and EGSM 900
Class 1 (1W) at DCS 1800 and PCS 1900
GPRS connectivity
GPRS multi-slot class 10 （default）
GPRS multi-slot class 8 (option)
GPRS mobile station class B
Temperature range
Normal operation: -20°C to +60°C
Restricted operation: -30°C to -20°C and +60°C to +80°C
Storage temperature -40°C to +85°C
DATA GPRS:
CSD:
GPRS data downlink transfer: max. 85.6 kbps
GPRS data uplink transfer: max. 42.8 kbps
Coding scheme: CS-1, CS-2, CS-3 and CS-4
SIM340 supports the protocols PAP (Password Authentication
Protocol) usually used for PPP connections.
The SIM340 integrates the TCP/IP protocol.
Support Packet Switched Broadcast Control Channel (PBCCH)
CSD transmission rates: 2.4, 4.8, 9.6, 14.4 kbps, non-transparent
Unstructured Supplementary Services Data (USSD) support
(1)
SMS MT, MO, CB, Text and PDU mode
SMS storage: SIM card
FAX Group 3 Class 1
SIM interface Support SIM card: 1.8V, 3V
External antenna Connected via 50 Ohm antenna connector or antenna pad
Audio features Speech codec modes:
Half Rate (ETS 06.20)
Full Rate (ETS 06.10)
Enhanced Full Rate (ETS 06.50 / 06.60 / 06.80)
Echo Cancellation
Serial port and Serial Port: Seven lines on Serial Port Interface
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SIM340 Hardware Design
Debug port Serial Port can be used for CSD FAX, GPRS service and send AT
command of controlling module.
Serial Port can use multiplexing function.
Autobauding supports baud rate from 4800 bps to 115200bps.
Debug Port: Two lines on Serial Port Interface /TXD and /RXD
Debug Port only used for debugging
Phonebook management Support phonebook types: SM, FD, LD, RC, ON, MC.
SIM Application Toolkit Support SAT class 3, GSM 11.14 Release 99
Real time clock Implemented
Timer function Programmable via AT command
Physical characteristics Size: 40±0.15 x 33±0.15 x 3.3±0.3mm (including application
connector)
40±0.15 x 33±0.15 x 2.9±0.3mm (excluding application
connector)
Weight: 8g
Firmware upgrade Firmware upgrade by serial port.
The SIM340 does works, but deviations from the GSM specification may occur, For example,
both the frequency error and the phase error will be large.
Table 4: Coding schemes and maximum net data rates over air interface
Coding scheme 1 Timeslot 2 Timeslot 4 Timeslot
CS-1: 9.05kbps 18.1kbps 36.2kbps
CS-2: 13.4kbps 26.8kbps 53.6kbps
CS-3: 15.6kbps 31.2kbps 62.4kbps
CS-4: 21.4kbps 42.8kbps 85.6kbps
2.2 SIM340 functional diagram
The following figure shows a functional diagram of the SIM340 and illustrates the mainly
functional part:
The GSM baseband engine
Flash and SRAM
The GSM radio frequency part
The antenna interface
The board-to-board interface
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SIM340 Hardware Design
Antenna
connector
Flash+
SRAM
SIM340
Radio
Frequency
Baseband
Engine
POWER
SIM
KEYPADS
LCD
UART
GPIO
ADC
Board-to-board Connector
AUDIO
Figure 2: SIM340 functional diagram
2.3 SIM340 evaluation board
In order to help you on the application of SIM340 application, SIMCom can supply an Evaluation
Board (EVB) that interfaces the SIM340 directly with appropriate power supply, SIM card holder,
RS232 serial port, handset port, earphone port, antenna and all GPIO of the SIM340.
We can support SIM300 EVB for your develop. This EVB can support SIM300 and SIM340.
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SIM340 Hardware Design
Figure 3: Top view of SIM300 EVB
For details please refer to the SIM300-EVB_UGD document.
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SIM340 Hardware Design
3 Application interface
SIM340 is equipped with a 60-pin 0.5mm pitch board-to-board connector that connects to the
cellular application platform. Sub-interfaces included in this board-to-board connector are
described in detail in following chapters:
Power supply (please refer to Chapter 3.3
Serial interfaces (please refer to Chapter 3.8
Two analog audio interfaces (please refer to Chapter 3.9
SIM interface (please refer to Chapter 3.11
Electrical and mechanical characteristics of the board-to-board connector are specified in Chapter 6.
There we also include order information for mating connectors.
3.1 SIM340 pin description
)
)
)
)
Table 5: Board-to-Board connector pin description
Power Supply
PIN NAME I/O DESCRIPTION DC CHARACTERISTICS COMMENT
VBAT I 8 VBAT pins of the board-to-board
connector are dedicated to connect
the supply voltage. The power
supply of SIM340 has to be a
single voltage source of VBAT=
3.4V...4.5V. It must be able to
provide sufficient current in a
transmitting burst which typically
rises to 2A.mostly. These 8 pins are
voltage input
VRTC I/O Current input for RTC when the
battery is not supplied for the
system.
Current output for backup battery
when the main battery is present
and the backup battery is in low
voltage state.
Vmax= 4.5V
Vmin=3.4V
Vnorm=4.0V
Vmax=2.0V
Vmin=1.2V
Vnorm=1.8V
Iout(max)= 20uA
Iin=5 uA
Do not keep
pin open, it
should be
connected to a
battery or a
capacitor.
VDD_EXT O Supply 2.93V voltage for external
circuit. By measuring this pin, user
can judge whether the system is
power on or off. When the voltage
is low, the system is power off.
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Vmax=3.0V
Vmin=2.75V
Vnorm=2.93V
Imax=10mA
If unused
keep pin open
SIM340 Hardware Design
Otherwise, the system is power on.
GND Digital ground
Power on or power off
PIN NAME I/O DESCRIPTION DC CHARACTERISTICS
PWRKEY I Voltage input for PWRKEY.
PWRKEY should be pulled low to
power on or power off the system.
VILmax=0.2*VBAT
VIHmin=0.6*VBAT
VImax=VBAT
pull up to
VBAT
The user should keep pressing the
key for a moment when power on
or power off the system because the
system need margin time in order
to assert the software.
Audio interfaces
PIN NAME I/O DESCRIPTION DC CHARACTERISTICS DC
MIC1P
MIC1N
MIC2P
MIC2N
SPK1P
SPK1N
SPK2P
SPK2N
I Positive and negative voice-band
input
I Auxiliary positive and negative
voice-band input
O Positive and negative voice-band
output
O Auxiliary positive and negative
voice-band output
Audio DC Characteristics
refer to chapter 3.9.4
If unused
keep pins
open
If unused
keep pins
open
BUZZER O Buzzer output If unused
keep pin open
AGND Analog ground Separate
ground
connection for
external audio
circuits.
If unused
keep pin open
General purpose input/output
PIN NAME I/O DESCRIPTION DC CHARACTERISTICS
KBC0~KB
C4
KBR0~KB
R4
DISP_DAT I/O/4m LCD display interface
O/4mA Tri-out, If
I/4mA
Keypad interface
VILmin=0V
VILmax=0.3 *VDD_EXT
VIHmin=0.7*VDD_EXT
VIHmax= VDD_EXT+0.3
VOLmin=GND
VOLmax=0.2V
VOHmin= VDD_EXT-0.2
VOHmax= VDD_EXT
unused keep
pins open
Pull up to
VEXT, if
unused keep
pins open
If unused
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SIM340 Hardware Design
A A
DISP_CLK O/4mA
DISP_CS O/4mA
DISP_D/C O/4mA
DISP_RST O/4mA
keep pins
open
NETLIGHT O/4mA Network status indication
GPIO0 I/O/4mA Normal input/output port
Serial port
PIN NAME I/O DESCRIPTION DC CHARACTERISTICS
DTR I/8mA Data terminal ready
RXD I/8mA Receive data
TXD O/8mA Transmit data
RTS I/8mA Request to send
VILmin=0V
VILmax=0.3*VDD_EXT
VIHmin=0.7*VDD_EXT
VIHmax= VDD_EXT+0.3
VOLmin=GND
CTS O/8mA Clear to send
RI O/8mA Ring indicator
DCD O/4mA Data carrier detection
VOLmax=0.2V
VOHmin= VDD_EXT-0.2
VOHmax= VDD_EXT
If unused
keep pins
open
If use only
TXD,RXD
GND three
pins to
communicate,
RTS p in
connect to
GND directly.
DTR pin is
pull up to
VEXT with
100K
If unused
keep pins
open
Debug port
DBG_TXD O/4mA
Serial interface for debugging only If unused
keep pins
DBG_RXD I/4mA
open
SIM interface
PIN NAME I/O DESCRIPTION DC CHARACTERISTICS
SIM_VDD O Voltage supply for SIM card The voltage can be select All signals of
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SIM340 Hardware Design
b
y software automatically
either 1.8V or 3V
SIM_DATA I/O/4mA SIM data output
VILmin=0V
VILmax=0.3*SIM_VDD
SIM_CLK O/4mA SIM clock
SIM_RST O/4mA SIM reset
VIHmin=0.7*SIM_VDD
VIHmax= SIM_VDD+0.3
VOLmin=GND
VOLmax=0.2V
VOHmin= SIM_VDD-0.2
VOHmax= SIM_VDD
SIM_PRES
I/4mA SIM card detection
ENCE
AUXADC
PIN NAME I/O DESCRIPTION DC CHARACTERISTICS
SIM interface
are protected
against ESD
with a TVS
diode array.
Maximum
cable length
200mm from
the module
connctor to
SIM card
holder.
If unused ,
connect to
GND.
ADC0 I General purpose analog to digital
converter.
Input voltage range: 0V to
2.4V
3.2 Operating modes
The table below briefly summarizes the various operating modes referred to in the following
chapters.
6: Overview of operating modes
Table
Mode Function
Normal operation
GSM/GPRS
SLEEP
GSM IDLE Software is active. Module has registered to the GSM network,
Module will automatically go into SLEEP mode if DTR is set
to high level and there is no on air and no hardware interrupt
(such as GPIO interrupt or data on serial port).
In this case, the current consumption of module will reduce to
the minimal level.
During SLEEP mode, the module can still receive paging
message and SMS from the system normally.
and the module is ready to send and receive.
If unused
keep pin open
GSM TALK Connection is going on between two subscribers. In this case,
the power consumption depends on network settings such as
DTX off/on, FR/EFR/HR, hopping sequences, antenna.
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SIM340 Hardware Design
GPRS
STANDBY
Module is ready for GPRS data transfer, but no data is
currently sent or received. In this case, power consumption
depends on network settings and GPRS configuration.
GPRS DATA There is GPRS data in transfer (PPP or TCP or UDP). In this
case, power consumption is related with network settings (e.g.
power control level), uplink / downlink data rates and GPRS
configuration (e.g. used multi-slot settings).
POWER DOWN Normal shutdown by sending the “AT+CPOWD=1” command or using the
PWRKEY. The power management ASIC disconnects the power supply from
the base band part of the module, and only the power supply for the RTC is
remained. Software is not active. The serial port is not accessible. Operating
voltage (connected to VBAT) remains applied.
Minimum
functionality
mode (without
remove power
supply)
Use the “AT+CFUN” command can set the module to a minimum functionality
mode without remove the power supply. In this case, the RF part of the module
will not work or the SIM card will not be accessible, or both RF part and SIM
card will be closed all, and the serial port is still accessible. The power
consumption in this case is very low.
Alarm mode RTC alert function launches this restricted operation while the module is in
POWER DOWN mode. SIM340 will not be registered to GSM network and
only parts of AT commands can be available.
3.3 Power supply
The power supply of SIM340 is from a single voltage source of VBAT= 3.4V...4.5V. In some
case, the ripple in a transmitting burst may cause voltage drops when current consumption rise to
typical peaks of 2A. So the power supply must be able to provide sufficient current up to 2A.
For the VBAT input, a local bypass capacitor is recommended. A capacitor (about 100 µF, low
ESR) is recommended. Multi-layer ceramic chip (MLCC) capacitors can provide the best
combination of low ESR and small size but may not be cost effective. A lower cost choice may be
a 100 µF tantalum capacitor (low ESR) with a small (0.1µF to 1µF) ceramic in parallel, which is
illustrated as following figure. The capacitors should put as close as possible to the SIM340
VBAT pins. The following figure is the recommended circuit.
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SIM340 Hardware Design
Figure 4: Reference circuit of the VBAT input
The circuit design of the power supply depends strongly from the power source where this power
is drained. The following figure is the reference design of +5V input source power supply. The
designed output for the power supply is 4V, thus a linear regulator can be used. If there’s a big
difference between the input source and the desired output (VBAT), a switching converter power
supply will be preferable because of its better efficiency especially with the 2A peak current in
burst mode of the module.
The single 3.6V Li-Ion cell battery type can be connected to the power supply of the SIM340
VBAT directly. But the Ni_Cd or Ni_MH battery types must be used carefully, since their
maximum voltage can rise over the absolute maximum voltage for the module and damage it.
Figure5: Reference circuit of the source power supply input
The following figure is the VBAT voltage ripple wave at the maximum power transmit phase, the
test condition is VBAT=4.0V, VBAT maximum output current =2A, C
capacitor (ESR=0.7Ω) and C
SIM340_HD_V3.09 18.03.2009
=1µF.
B
23
=100µF tantalum
A
SIM340 Hardware Design
577us
4.615ms
IVBAT
Burst:2A
VBAT
Max:400mV
Figure6: VBAT voltage drop during transmit burst
3.3.1 Power supply pins on the board-to-board connector
Eight VBAT pins of the board-to-board connector are dedicated to connect the supply voltage; six
GND pins are recommended for grounding. VRTC pin can be used to back up the RTC.
3.3.2 Minimizing power losses
Please pay special attention to the supply power when you are designing your applications. Please
make sure that the input voltage will never drop below 3.4V even in a transmitting burst during
which the current consumption may rise up to 2A. If the power voltage drops below 3.4V, the
module may be switched off. The PCB traces from the VBAT pins of connector to the power
source must be wide enough to ensure no voltage drops occur in the transmitting burst mode.
3.3.3 Monitoring power supply
To monitor the supply voltage, you can use the “AT+CBC” command which include three
parameters: charging status, voltage percent and voltage value (in mV). It returns the battery
voltage 1-100 percent of capacity and actual value measured at VBAT and GND.
The voltage is continuously measured at intervals depending on the operating mode. The
displayed voltage (in mV) is averaged over the last measuring period before the AT+CBC
command is executed.
For details please refer to document [1]
3.4 Power up and power down scenarios
3.4.1 Turn on SIM340
SIM340 can be turned on by various ways, which are described in following chapters:
Via PWRKEY pin: starts normal operating mode (please refer to chapter 3.4.1.1);
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SIM340 Hardware Design
Via RTC interrupt: starts ALARM modes (please refer to chapter 3.4.1.2)
Note: The AT command must be set after the SIM340 is power on and Unsolicited Result Code
“RDY” is received from the serial port. However, if the SIM340 was set autobauding, the serial
port will received nothing, the AT command can be set after 2-3s from the SIM340 is power on.
You can use AT+IPR=x;&W to set a fix baud rate and save the configuration to non-volatile
flash memory. After the configuration was saved as fix baud rate, the Code “RDY” should be
received from the serial port all the time that the SIM340 was power on. Please refer to the
chapter AT+IPR in document [1].
3.4.2 Turn on SIM340 using the PWRKEY pin (Power on)
You can turn on the SIM340 by driving the PWRKEY to a low level voltage for some time and
then released. This pin is pulled up to VBAT in the module. The maximum current that can be
drained from the PWRKEY pin is 0.4mA. The simple circuit illustrates as the following figures.
PWRKEY
Turn on impulse
Figure 7: Turn on SIM340 using driving circuit
4.7K
47K
S1
PWRKEY
TVS1
Figure 8: Turn on SIM340 using button
The power on scenarios illustrates as following figure.
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SIM340 Hardware Design
VBAT
Pulldown > 2s
Hiz
> 0.6*VBAT
PWRKEY
(INPUT)
VIL<0.2*VBAT
V
IH
VDD_EXT
（OUTPUT）
Figure 9: Timing of turn on system
When power on procedure complete, the SIM340 will send out following result code to indicate
the module is ready to operate when set as fixed baud rate.
RDY
This result code does not appear when autobauding is active.
3.4.3 Turn on SIM340 using the RTC (Alarm mode)
Alarm mode is a power-on approach by using the RTC. The alert function of RTC makes the
SIM340 wake up while the module is power off. In alarm mode, SIM340 will not register to GSM
network and the software protocol stack is closed. Thus the parts of AT commands related with
SIM card and Protocol stack will not be accessible, and the others can be used as well as in normal
mode.
Use the AT+CALARM command to set the alarm time. The RTC remains the alarm time if
SIM340 is power down by “AT+CPOWD=1” or by PWRKEY pin. Once the alarm time is expired
and executed, SIM340 will go into the alarm mode. In this case, SIM340 will send out an
Unsolicited Result Code (URC) when set as fixed baud rate:
RDY
ALARMMODE
This result code does not appear when autobauding is active.
During alarm mode, use AT+CFUN command to query the status of software protocol stack; it
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SIM340 Hardware Design
will return 0 which indicates that the protocol stack is closed. Then after 90s, SIM340 will power
down automatically. However, during alarm mode, if the software protocol is started by
AT+CFUN=1 command, the process of automatic power down will not be available. In alarm
mode, driving the PWRKEY to a low level voltage for a period will cause SIM340 to be powered
down (Please refer to the power down scenario).
The table follow briefly summarizes the AT commands that are used usually during alarm mode,
for details of the instructions refer to document [1]:
Table 7: AT commands used in Alarm mode
AT command Use
AT+CALARM Set alarm time
AT+CCLK Set data and time of RTC
AT + CP O W D Power down
AT+CFUN Start or close the protocol stack
3.4.2 Turn off SIM340
Following procedure can be used to turn off the SIM340:
Normal power down procedure: Turn off SIM340 using the PWRKEY pin
Normal power down procedure: Turn off SIM340 using AT command
Over-voltage or under-voltage automatic shutdown: Take effect if over-voltage or under-voltage is
detected
Over-temperature or under-temperature automatic shutdown: Take effect if over-temperature or
under-temperature is detected
3.4.2.1 Turn off SIM340 using the PWRKEY pin (Power down)
You can turn off the SIM340 by driving the PWRKEY to a low level voltage for some time. Please
refer to the turn on circuit. The power down scenario illustrates as following figure.
This procedure lets the module log off from the network and allow the software to enter into a
secure state and save data before completely disconnect the power supply.
Before the completion of the switching off procedure the module will send out result code:
NORMAL POWER DOWN
After this moment, the AT commands can’t be executed. The module enters the POWER DOWN
mode, only the RTC is still active. POWER DOWN can also be indicated by VDD_EXT pin,
which is a low level voltage in this mode.
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SIM340 Hardware Design
Logout net about 2s to 8s
PWRKEY
（INPUT）
VDD_EXT
（OUTPUT）
1s>Pulldown >0.5s
V
V
<0.2*VBAT
IL
>0.6*VBAT
IH
Figure 10: Timing of turn off system
3.4.2.2 Turn off SIM340 using AT command
You can use an AT command “AT+CPOWD=1” to turn off the module. This command will let
the module to log off from the network and allow the module to enter into a secure state and save
data before completely disconnecting the power supply.
Before the completion of the switching off procedure the module will send out result code:
NORMAL POWER DOWN
After this moment, the AT commands can’t be executed. The module enters the POWER DOWN
mode, only the RTC is still active. POWER DOWN can also be indicated by VDD_EXT pin,
which is a low level voltage in this mode.
Please refer to document [1] for detail about the AT command of “AT+CPOWD”.
3.4.2.3 Over-voltage or under-voltage automatic shutdown
The module will constantly monitor the voltage applied on the VBAT, if the voltage ≤ 3.5V, the
following URC will be presented:
UNDER-VOLTAGE WARNNING
If the voltage ≥ 4.5V, the following URC will be presented:
OVER-VOLTAGE WARNNING
The uncritical voltage range is 3.4V to 4.6V. If the voltage ≥ 4.6V or ≤ 3.4V, the module will
be automatic shutdown soon.
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SIM340 Hardware Design
If the voltage ≤ 3.4V, the following URC will be presented:
UNDER-VOLTAGE POWER DOWN
If the voltage ≥ 4.6V, the following URC will be presented:
OVER-VOLTAGE POWER DOWN
After this moment, no further more AT commands can be executed. The module logs off from
network and enters POWER DOWN mode, and only the RTC is still active. POWER DOWN can
also be indicated by VDD_EXT pin, which is a low level voltage in this mode.
3.4.2.4 Over-temperature or under-temperature automatic shutdown
The module will constantly monitor the temperature of the module, if the temperature ≥ 80℃,
the following URC will be presented:
+CMTE:1
If the temperature ≤ -30℃, the following URC will be presented:
+CMTE:-1
The uncritical temperature range is -35℃ to 85℃. If the temperature ≥ 85℃ or ≤ -35℃, the
module will be automatic shutdown soon.
If the temperature ≥ 85℃, the following URC will be presented:
+CMTE:2
If the temperature ≤ -35℃, the following URC will be presented:
+CMTE:-2
After this moment, the AT commands can’t be executed. The module logs off from network and
enters POWER DOWN mode, and only the RTC is still active. POWER DOWN can also be
indicated by VDD_EXT pin, which is a low level voltage in this mode.
To monitor the temperature, you can use the “AT+CMTE” command to read the temperature when
the module is power on.
For details please refer to document [1]
3.4.3 Restart SIM340 using the PWRKEY pin
You can restart SIM340 by driving the PWRKEY to a low level voltage for some time, the same
as turn on SIM340 using the PWRKEY pin. Before restarting the SIM340, you need delay at least
500ms from detecting the VDD_EXT low level on. The restarting scenario illustrates as the
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SIM340 Hardware Design
following figure.
Figure 11: Timing of restart system
3.5 Power saving
There are two methods for the module to enter into low current consumption status. “AT+CFUN”
is used to set module into minimum functionality mode and DTR hardware interface signal can be
used to lead system to be in SLEEP mode (or slow clocking mode).
3.5.1 Minimum functionality mode
Minimum functionality mode reduces the functionality of the module to a minimum and, thus,
minimizes the current consumption to the lowest level. This mode is set with the “AT+CFUN”
command which provides the choice of the functionality levels <fun>=0，1，4
0: minimum functionality;
1: full functionality (default);
4: disable phone both transmit and receive RF circuits;
If SIM340 has been set to minimum functionality by “AT+CFUN=0”, the RF function and SIM
card function will be closed, in this case, the serial port is still accessible, but all AT commands
correlative with RF function or SIM card function will not be accessible.
If SIM340 has been set by “AT+CFUN=4”, the RF function will be closed, the serial port is still
active in this case, all AT commands correlative with RF function will not be accessible.
After SIM340 has been set by “AT+CFUN=0” or “AT+CFUN=4”, it can return to full
functionality by “AT+CFUN=1”.
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SIM340 Hardware Design
For detailed information about “AT+CFUN”, please refer to document [1].
3.5.2 Sleep mode (slow clock mode)
We can control SIM340 module to enter or exit the SLEEP mode in customer applications through
DTR signal.
When DTR is in high level and there is no on air and hardware interrupt (such as GPIO interrupt
or data on serial port), SIM340 will enter SLEEP mode automatically. In this mode, SIM340 can
still receive paging or SMS from network but the serial port is not accessible.
Note: For SIM340, it requests to set AT command “AT+CSCLK=1” to enable the sleep mode;
the default value is 0, that can’t make the module enter sleep mode.For more details please
refer to our AT command list.
3.5.3 Wake up SIM340 from SLEEP mode
When SIM340 is in SLEEP mode, the following methods can wake up the module.
Enable DTR pin to wake up SIM340.
If DTR Pin is pulled down to a low level, this signal will wake up SIM340 from power
saving mode. The serial port will be active after DTR changed to low level for about 40ms.
Receiving a voice or data call from network to wake up SIM340.
Receiving a SMS from network to wake up SIM340.
RTC alarm expired to wake up SIM340.
Note: DTR pin should be held low level during communicating between the module and DTE.
3.6 Summary of state transitions (except SLEEP mode)
Table 8: Summary of state transitions
Further mode
Current mode
POWER DOWN Use
POWER DOWN Normal
mode
PWRKEY
Alarm mode
Switch on from POWER DOWN
mode by RTC
Normal mode AT+CPOWD or
use PWRKEY pin
Set alarm by “AT+CALARM”, and
then switch off the module. When the
timer expire, the module turn on and
enter Alarm mode
Alarm mode Use PWRKEY
pin or wait
SIM340_HD_V3.09 18.03.2009
Use
AT+CFUN
31
SIM340 Hardware Design
module switch off
automatically
3.7 RTC backup
The RTC (Real Time Clock) power supply of module can be provided by an external capacitor or
a battery (rechargeable or non-chargeable) through the VRTC on the board-to-board connector.
There is a 10K resistance has been integrated in SIM340 module used for limiting current. You
need only a coin-cell battery or a super-cap to VRTC to backup power supply for RTC.
Note: The VRTC couldn’t be designed to a NC pin in your circuit. You should connect the
VRTC pin to a battery or a capacitor.
The following figures show various sample circuits for RTC backup.
MODULE
Non-chargeable
Backup Battery
Rechargeable
Backup Battery
VRTC
Figure 12: RTC supply from non-chargeable battery
10K
MODULE
VRTC
10K
RTC
Core
RTC
Core
Figure 13: RTC supply from rechargeable battery
SIM340_HD_V3.09 18.03.2009
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SIM340 Hardware Design
MODULE
VRTC
10K
RTC
Core
Large-capacitance
Capacitor
Figure 14: RTC supply from capacitor
Li-battery backup
Rechargeable Lithium coin cells such as the TC614 from Maxell, or the TS621 from Seiko, are
also small in size, but have higher capacity than the double layer capacitors resulting in longer
backup times.
Typical charge curves for each cell type are shown in following figures. Note that the rechargeable
Lithium type coin cells generally come pre-charged from the vendor.
Figure 15: Panasonic EECEMOE204A Charge Characteristic
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SIM340 Hardware Design
Figure 16: Maxell TC614 Charge Characteristic
Figure 17: Seiko TS621 Charge Characteristic
Note:
Gold-capacitance backup
Some suitable coin cells are the electric double layer capacitors available from Seiko (XC621),
or from Panasonic (EECEM0E204A). They have a small physical size (6.8mm diameter) and a
nominal capacity of 0.2F to 0.3F, giving hours of backup time.
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SIM340 Hardware Design
3.8 Serial interfaces
Table 9: Pin definition of the serial interfaces
Name Pin Function
DCD 28 Data carrier detection
DTR 38 Data terminal ready
RXD 40 Receive data
Serial port
TXD 42 Transmit data
RTS 44 Request to send
CTS 46 Clear to send
RI 48 Ring indicator
Debug port
DBG_RXD 47 Receive data
DBG_TXD 49 Transmit data
SIM340 provides two unbalanced asynchronous serial ports. One is the serial port and another is
the debug port. The GSM module is designed as a DCE (Data Communication Equipment),
following the traditional DCE-DTE (Data Terminal Equipment) connection.The module and the
client (DTE) are connected through the following signal (as following figure shows). Autobauding
supports baud rate from 4800bps to 115200bps.
Serial port
TXD: Send data to the RXD signal line of the DTE
RXD: Receive data from the TXD signal line of the DTE
Debug port
DBG_TXD: Send data to the /RXD signal line of the DTE
DBG_RXD: Receive data from the /TXD signal line of the DTE
The logic levels are described in following table
10: Logic levels of the serial port and debug port
Table
Parameter Min Max Unit
VIL 0 0.3*VDD_EXT V
VIH 0.7 *VDD_EXT VDD_EXT +0.3 V
VOL GND 0.2 V
VOH VDD_EXT -0.2 VDD_EXT V
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SIM340 Hardware Design
Figure 18: Connection
of the serial interfaces
Note: The RTS PIN must be connected to the GND in the customer circuit when only the TXD
and RXD are used in the Serial Port communication
3.8.1 Function of serial port & debug port supporting
Serial port
Seven lines on serial port.
Contains data lines TXD and RXD, State lines RTS and CTS, Control lines DTR, DCD and RI.
Serial port can be used for CSD FAX, GPRS service and send AT command of controlling module.
Also serial port can be used for multiplexing function.
Serial port supports the communication rates as following:
300, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200 Default as 115200bps.
Autobauding supports baud rates as following:
4800, 9600, 19200, 38400, 57600 and 115200bps.
Autobauding allows the GSM engine to automatically detect the baud rate configured in the host
application. The serial port of the GSM engine supports autobauding for the following baud rates:
4800, 9600, 19200, 38400, 57600, 115200bps. Factory setting is autobauding enabled. This gives
you the flexibility to put the GSM engine into operation no matter what baud rate your host
application is configured to. To take advantage of autobauding mode, specific attention should be
paid to the following requirements:
Synchronization between DTE and DCE
When DCE powers on with the autobauding enabled, it is recommended to wait 2 to 3 seconds
before sending the first AT character. After receiving the “OK” response, DTE and DCE are
correctly synchronized.
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SIM340 Hardware Design
Restrictions on autobauding operation
The serial port has to be operated at 8 data bits, no parity and 1 stop bit (factory setting).
The Unsolicited Result Codes like "RDY", "+CFUN: 1" and "+CPIN: READY” are not indicated
when you start up the ME while autobauding is enabled. This is due to the fact that the new baud
rate is not detected unless DTE and DCE are correctly synchronized as described above.
Note: You can use AT+IPR=x;&W to set a fixed baud rate and save the configuration to
non-volatile flash memory. After the configuration is saved as fixed baud rate, the Unsolicited
Result Codes like "RDY" should be received from the serial port all the time that the SIM340
was power on.
Debug port
Two lines on Debug port
Only contains Data lines /TXD and /RXD
Debug Port only used for debugging. It cannot be used for CSD call, FAX call. And the Debug
port can not use multiplexing function. It does not support autobauding function.
Debug port supports the communication rates as following:
9600, 19200, 38400, 57600, 115200bps
3.8.2 Software upgrade and software debug
The TXD、RXD、DBG_TXD、DBG_RXD and GND must be connected to the IO connector when
user need to upgrade software and debug software, the TXD、RXD should be used for software
upgrade and the DBG_TXD、 DBG_RXD for software debugging. The PWRKEY pin is
recommended to connect to the IO connector. The user also can add a switch between the
PWRKEY and the GND. The PWRKEY should be connected to the GND when SIM340 is
upgrading software. Please refer to the following figures.
MODULE(DCE)
CUSTOMER(DTE)
Serial port
TXD
RXD
GND
TXD
RXD
GND
PWRKEY
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SIM340 Hardware Design
Figure 19: Connection of software upgrade
Note: The RTS PIN must be connected to the GND in the customer circuit when only the TXD
and RXD are used in the Serial Port communication.
MODULE(DCE)
CUSTOMER(DTE)
Debug port
DBG_TXD
DBG_RXD
GND
TXD
RXD
GND
Figure 20: Connection of software debug
The serial port and the debug port doesn’t support the RS_232 level, it only supports the CMOS
level. Please refer to the table 10 for details about the voltage level. You should add the level
converter IC between the DCE and DTE if you connect it to the computer. Please refer to the
following figure.
Figure 21: RS232 level converter circuit
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SIM340 Hardware Design
Note：For detail information about serial port application, please refer to document [10]
3.9 Audio interfaces
Table 11: Pin definition of the Audio interface
Name Pin Function
(AIN1/AOUT1)
MIC1P 53 Microphone1 input +
MIC1N 55 Microphone1 input -
SPK1P 54 Audio1 output+
SPK1N 56 Audio1 output-
(AIN2/AOUT2)
MIC2P 57 Microphone2 input +
MIC2N 59 Microphone2 input -
SPK2P 58 Audio2 output+
SPK2N 60 Audio2 output-
The module provides two analogy input channels, AIN1 and AIN2, which may be used for both
microphone and line inputs. The electret microphone is recommended when the interface used for
microphone. One of the two channels is typically used with a microphone built into a handset. The
other channel is typically used with an external microphone or external line input. The module
analogy input configuration is determined by control register settings and established using
analogy multiplexes.
For each channels, you can use AT+CMIC to adjust the input gain level of microphone, use
AT+SIDET to set the side-tone level. In addition, you can also use AT+CLVL to adjust the output
gain level of both receiver and speaker at the same time, use AT+CHFA to activate one of the two
audio channels and deactivate the other one.. For more details, please refer to document [1].
Note: Use AT command AT+CHFA to select_audio channel:
AIN1/AOUT1 (normal audio channel), the default value is 0.
AIN2/AOUT2(aux_audio channel) .
It is suggested that you adopt one of the following two matching circuits in order to improve audio
performance. The difference audio signals have to be layout according to difference signal layout
rules. As show in following figures (Note: all components package are 0603.) If you want to
adopt an amplifier circuit for audio, we recommend National company’s LM4890. Of course you
can select it according to your requirement.
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3.9.1 Speaker interface configuration
Figure 22: Speaker interface configuration
Figure 23: Speaker interface with amplifier configuration
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3.9.2 Microphone interfaces configuration
Close to Microphone
GND
GND
Differential layout
10pF
MODULE
MICxP
10pF
MICxN
33pF
33pF
GND
ESD
ANTI
Microphone
Electret
AGND
AGND
Figure 24: Microphone interface configuration
3.9.3 Earphone interface configuration
Close to MODULE
MIC2N
MIC2P
Differential
MODULE
layout
10pF
GND
33pF
GND
ESD
ANTI
GND
Close to Socket
GND
GND
33pF
GND
33pF
68R
SPK2P
1uF
AGND
33pF 33pF
AGND
10R
3
4
AGND
2
1
Amphenol
9001-8905-050
33pF 10pF
GNDGND
GND
GND
GND
Figure 25: Earphone interface configuration
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3.9.4 Referenced electronic characteristic
12: MIC Input Characteristics
Table
Parameter Min Typ Max Unit
Worki n g Vol t age 1.2 1.5 2.0 V
Working Current 200 500 uA
External
1.2 2.2 k Ohms
Microphone
Load Resistance
Table 13: Audio Output Characteristics
Parameter Min Typ Max Unit
Normal
Output(SPK1)
Ended
load
Resistance
Nominal
Output
27 32 Ohm Single
0.5477
-12.04
Vpp
dBm
Level
(PGA=0dB)
Differential
load
27 32 Ohm
Resistance
Nominal
Output
1.0954
-6.02
Vpp
dBm
Level
(PGA=0dB)
Auxiliary
Output(SPK2)
Ended
load
Resistance
Nominal
Output
27 32 Ohm Single
0.5477
-12.04
Vpp
dBm
Level
(PGA=0dB)
Differential
load
27 32 Ohm
Resistance
Nominal
Output
1.0954
-6.02
Vpp
dBm
Level
(PGA=0dB)
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3.10 Buzzer
The BUZZER on the board-to-board connector can be used to drive a buzzer to indicate incoming
call. The output volume of buzzer can be set by “AT+CRSL”. The reference circuit for buzzer
shown as following figure:
VBAT
MODULE
4.7K
BUZZER
47K
Figure 26: Reference circuit of Buzzer
Table 14: Buzzer Output Characteristics
Parameter Min Typ Max Unit
Worki n g Vol t age 2.4 2.8 3.3 V
Working Current 2 mA
Load Resistance 1 k Ohms
3.11 SIM card interface
3.11.1 SIM card application
You can use AT Command to get information in SIM card. For more information, please refer to
document [1].
The SIM interface supports the functionality of the GSM Phase 1 specification and also supports
the functionality of the new GSM Phase 2+ specification for FAST 64 kbps SIM (intended for use
with a SIM application Tool-kit).
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Both 1.8V and 3.0V SIM Cards are supported.
The SIM interface is powered from an internal regulator in the module having normal voltage 3V.
All pins reset as outputs driving low. Logic levels are as described in table
15: Pin definition of the SIM interface
Table
Name Pin Function
SIM_VDD 19 SIM Card Power output automatic output on SIM mode，
one is 3.0V±10%, another is 1.8V±10%. Current is about
10mA.
SIM_DATA 21 SIM Card data I/O
SIM_CLK 23 SIM Card Clock
SIM_RST 25 SIM Card Reset
SIM_PRESENCE 16 SIM Card Presence
Following is the reference circuit about SIM interface. We recommend an Electro-Static discharge
device ST (www.st.com
) ESDA6V1W5 or ON SEMI (www.onsemi.com ) SMF05C for “ESD
ANTI”. The 22Ω resistors showed in the following figure should be added in series on the IO line
between the module and the SIM card for protecting the SIM I/O port. The pull up resistor (about
10KΩ) must be added on the SIM_DATA line. Note that the SIM peripheral circuit should be
closed to the SIM card socket.
The SIM_PRESENCE pin is used for detecting the SIM card removal. You can use the AT
command “AT+CSDT” to set the SIMCARD configuration. For detail of this AT command,
please refer to document [1]:
You can select the 8 pins SIM card holder. The reference circuit about 8 pins SIM card holder
illustrates as following figure.
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SIM340 Hardware Design
Figure 27: Reference circuit of the 8 pins SIM card
If you don’t use the SIM card detection function, you can let the SIM_PRESENCE pin connect to
the GND. The reference circuit about 6 pins SIM card illustrates as following figure.
Figure 28: Reference circuit of the 6 pins SIM card
3.11.2 Design considerations for SIM card holder
For 6 pins SIM card holder, we recommend to use Amphenol C707 10M006 512 2 .You can visit
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http://www.amphenol.com for more information about the holder.
Figure 29: Amphenol C707 10M006 512 2 SIM card holder
Table 16: Pin description (Amphenol SIM card holder)
Pin Signal Description
C1
SIM_VDD SIM Card Power supply, it can identify automatically the SIM
Card power mode，one is 3.0V±10%, another is 1.8V±10%.
Current is about 10mA.
C2
C3
C5
C6
C7
SIM_RST SIM Card Reset.
SIM_CLK SIM Card Clock.
GND Connect to GND.
VPP Not connect.
SIM_DATA SIM Card data I/O.
For 8 pins SIM card holder, we recommend to use Molex 91228.You can visit
http://www.molex.com
for more information about the holder.
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Figure 30: Molex 91228 SIM card holder
17: Pin description (Molex SIM card holder)
Table
Pin Signal Description
C1
SIM_VDD SIM Card Power supply, it can identify
automatically the SIM Card power mode，one is
3.0V±10%, another is 1.8V±10%. Current is
about 10mA.
C2
C3
C4
C5
C6
C7
C8
SIM_RST SIM Card Reset
SIM_CLK SIM Card Clock
GND Connect to GND
GND Connect to GND
VPP Not connect
SIM_DATA SIM Card data I/O
SIM_PRESENCE Detect SIM Card Presence
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3.12 LCD display interface
SIM340 provides a serial LCD display interface that supports serial communication with
LCD device. These are composite pins that can be used as GPIO ports or LCD display
interface according to your application. When used as LCD interface, the following table is
the pin definition. LCD interface timing should be united with the LCD device.
18: Pin definition of the LCD interface
Table
Name Pin Function
DISP_DATA 18 Display data output
DISP_CLK 20 Display clock for LCD
DISP_CS 22 Display enable
DISP_D/C 24 Display data or command select
DISP_RST 26 LCD reset
Note: This function is not supported in the default firmware. There must be special firmware if
you want. Please contact SIMCom for more details.
3.13 Keypad interface
The keypad interface consists of 5 keypad column outputs and 5 keypad row inputs. The basic
configuration is 5 keypad columns and 5 keypad rows, giving 25 keys, plus the 5 additional keys
(i.e. where a keypad row is pulled low regardless of which column is enabled).
19: Pin definition of the keypad interface
Table
Name Pin Function
KBC0 27
KBC1 29
KBC2 31
KBC3 33
KBC4 35
KBR0 37
KBR1 39
KBR2 41
Keypad matrix column
Keypad matrix row
KBR3 43
KBR4 45
The keypad interface allows a direct external matrix connection. A typical recommended circuit
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about the keypad is as shown in the following figure. The GND column is added for the additional
5 keys.
Figure 31: Reference circuit of the keypad interface
Note: This function is not supported in the default firmware. There must be special firmware if
you want. Please contact SIMCom for more details
3.14 ADC
SIM340 provides one auxiliary ADC (General purpose analog to digital converter.) as voltage
input pin, which can be used to detect the values of some external items such as voltage,
temperature etc. We can use AT command “AT+CADC” to read the voltage value added on
ADC0. For detail of this AT command, please refer to document [1].
Table 20: ADC specification
Min Typ Max Units
Voltage range 0 2.4 V
ADC Resolution 16 16 bits
ADC accuracy* 0.59 mV
Sampling rate 5 Sec
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ADC accuracy*: 12bits.
3.15 Behaviors of the RI
Table 21: Behaviours of the RI
State RI respond
Standby
HIGH
Voice calling Change LOW, then:
（1）Change to HIGH when establish calling.
（2）Use AT command ATH, the RI pin changes to HIGH.
（3）Sender hangs up, change to HIGH.
（4）Change to HIGH when SMS received.
Data calling Change LOW, then:
（1）Change to HIGH when establish calling.
（2）Use AT command ATH, the RI changes to HIGH.
SMS When receive SMS, The RI will change to LOW and hold low level about
120 ms, then change to HIGH.
URC Some URCs triggers 120ms low level on RI. For more details, please
refer to document [10]
If the module is used as caller, the RI on the board-to-board connector will maintain high.
However, when it is used as receiver, following is timing of ring.
HIGH
LOW
RI
Power on Ring
MO or MT
Hang up
Ring
Hang on
(talking)
MO or
MT
Hang up
Ring
Figure 32: SIM340 Services as receiver
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Figure 33: SIM340 Services as caller
3.16 Network status indication
The NETLIGHT on the board-to-board connector can be used to drive a network status indication
LED lamp. The working state of this pin is listed in following table:
Table
22: Working state of the NETLIGHT
State SIM340 function
Off SIM340 is not running
64ms On/ 800ms Off SIM340 does not find the network
64ms On/ 3000ms Off SIM340 find the network
64ms On/ 300ms Off GPRS communication
We provide a reference circuit for you, shown as following figure:
MODULE
4.7K
NETLIGHT
VBAT
300R
47K
Figure 34: Reference circuit of NETLIGHT
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3.17 General purpose input & output (GPIO)
SIM340 provides a limited number of General Purpose Input/Output signal pin.
Table
23: Pin definition of the GPIO interface
Name Pin Function
GPIO0 32 General Purpose Input/Output Port
Note: This function is not supported in the default firmware. There must be special firmware if
you require. Please contact SIMCom for more details
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4 Antenna interface
The RF interface has an impedance of 50Ω. To suit the physical design of individual applications
SIM340 offers alternatives:
Recommended approach: antenna connector on the component side of the PCB
Antenna pad and grounding plane placed on the bottom side.
To minimize the loss on the RF cable, it need be very careful to choose RF cable. We recommend
the insertion loss should be meet following requirement:
GSM850/GSM900<1dB
DCS1800/PCS1900<1.5dB
4.1 Antenna installation
4.1.1 Antenna connector
SIM340 uses MURATA’s MM9329-2700RA1 RF connector on the module side; we recommend
to use MURATA’s MXTK92XXXXX as matching connector on the application side. Please refer
to appendix for detail info about MURATA’s MXTK92XXXXX.
4.1.2 Antenna pad
The antenna can be soldered to the pad, or attached via contact springs. To help you to ground the
antenna, SIM340 comes with a grounding plane located close to the antenna pad.
SIM340 material properties:
SIM340 PCB Material: FR4
Antenna pad: Gold plated pad
Antenna pad soldering temperature: we recommend 350℃.
Note: The soldering time for antenna pad and GND pad are different, less than 3s for antenna
pad and less than 10s for GND pad.
Module RF output power
Table 24: SIM340 conducted RF output power
Frequency Max Min
GSM850 33dBm ±2db 5dBm±5db
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EGSM900 33dBm ±2db 5dBm±5db
DCS1800 30dBm ±2db 0dBm±5db
PCS1900 30dBm ±2db 0dBm±5db
4.2 Module RF receive sensitivity
Table 25: SIM340 conducted RF receive sensitivity
Frequency Receive sensitivity
GSM850 < -106dBm
EGSM900 < -106dBm
DCS1800 < -106dBm
PCS1900 < -106dBm
4.3 Module operating frequencies
Table 26: SIM340 operating frequencies
Frequency Receive Transmit
GSM850 869 ～ 894MHz 824 ～ 849 MHz
EGSM900 925 ～ 960MHz 880 ～ 915MHz
DCS1800 1805 ～ 1880MHz 1710 ～ 1785MHz
PCS1900 1930 ～ 1990MHz 1850 ～ 1910MHz
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5 Electrical, reliability and radio characteristics
5.1 Absolute maximum ratings
Absolute maximum rating for power supply and voltage on digital and analog pins of SIM340 are
listed in following table:
27: Absolute maximum ratings
Table
Parameter Min Max Unit
Peak current of power supply 0 3.0 A
RMS current of power supply (during one TDMA- frame) 0 0.7 A
Voltage at digit pins -0.3 3.3 V
Voltage at analog pins -0.3 3.0 V
Voltage at digit/analog pins in POWER DOWN mode -0.25 0.25 V
5.2 Operating temperatures
The operating temperature is listed in following table:
Table
28: SIM340 operating temperature
Parameter Min Typ Max Unit
Ambient temperature -20 25 60 ℃
Restricted operation* -30 to -20 60 to 80 ℃
Storage temperature -40 85 ℃
* SIM340 does work, but deviations from the GSM specification may occur, For example, the
frequency error or the phase error will be large.
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5.3 Power supply ratings
Table 29: SIM340 power supply ratings
Parameter Description Conditions Min Typ Max Unit
VBAT Supply voltage Voltage must stay within the
min/max values, including
voltage drop, ripple, and spikes.
Voltage drop
during transmit
Normal condition, power
control level for Pout max
burst
Voltage ripple Normal condition, power
control level for Pout max
@ f<200kHz
@ f>200kHz
I
VBAT
Average supply
current
POWER DOWN mode
SLEEP mode
IDLE mode
GSM850/EGSM 900
DCS1800/PCS1900
TALK mode
GSM850/EGSM 900
DCS1800/PCS1900
3.4 4.0 4.5 V
400 mV
50
mV
2
35
2.5
23
23
260
190
uA
mA
mA
mA
Peak supply
current (during
transmission
slot every 4.6ms)
DATA mode, GPRS (3 Rx,2Tx)
GSM850/EGSM 900
DCS1800/PCS1900
DATA mode, GPRS (4 Rx,1Tx)
GSM850/EGSM 900
DCS1800/PCS1900
Power control level for Pout
max.
490
mA
340
290
mA
220
2 A
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5.4 Current consumption
The values for current consumption listed below refer to Table 30.
Table
30: SIM340 current consumption
Voice Call
GSM850/EGSM 900 @power level #5 <350mA,Typical 260mA
@power level #10,Typical 130mA
@power level #19,Typical 86mA
DCS 1800/PCS 1900 @power level #0 <300mA,Typical 200mA
@power level #10,Typical 87mA
@power level #15,Typical 80mA
GPRS Data
DATA mode, GPRS ( 1 Rx,1 Tx ) CLASS 8
GSM850/EGSM 900 @power level #5 <350mA,Typical 260mA
@power level #10,Typical 125mA
@power level #19,Typical 84mA
DCS 1800/PCS 1900 @power level #0 <300mA,Typical 200mA
@power level #10,Typical 83mA
@power level #15,Typical 76mA
DATA mode, GPRS ( 3 Rx, 2 Tx ) CLASS 10
GSM850/EGSM 900 @power level #5 <550mA,Typical 470mA
@power level #10,Typical 225mA
@power level #19,Typical 142mA
DCS 1800/PCS 1900 @power level #0 <450mA,Typical 340mA
@power level #10,Typical 140mA
@power level #15,Typical 127mA
DATA mode, GPRS ( 4 Rx,1 Tx ) CLASS 8
GSM850/EGSM 900 @power level #5 <350mA,Typical 270mA
@power level #10,Typical 160mA
@power level #19,Typical 120mA
DCS 1800/PCS 1900 @power level #0 <300mA,Typical 220mA
@power level #10,Typical 120mA
@power level #15,Typical 113mA
Class 10 is default set when the module works at data translation mode, the module can also work
at class 8 set by AT command.
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5.5 Electro-Static discharge
The GSM engine is not protected against Electrostatic Discharge (ESD) in general. Therefore, it is
subject to ESD handing precautions that typically apply to ESD sensitive components. Proper
ESD handing and packaging procedures must be applied throughout the processing, handing and
operation of any application using a SIM340 module.
The measured values of SIM340 are shown as the following table:
Table 31: The ESD endure statue measured table (Temperature: 25 , Humidity℃ : 45% )
Part Contact discharge Air discharge
VBAT,GND ±4KV ±8KV
KBR0-4, DTR, RXD, TXD, RTS,
DISP_DATA, DISP_CLK
Antenna port ±2KV ±4KV
Other port ±1KV
±2KV ±4KV
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6 Product information
Table 322: Ordering information
Part Number Frequency Bands(MHz) Function Pin Compatible
SIM340 GSM850 EGSM900
DCS1800 PCS1900
SIM340Z GSM850 EGSM900
DCS1800 PCS1900
NOTES: SIM340Z is fully RoHS compliant to EU regulation
GSM/GPRS YES
GSM/GPRS YES
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7 Mechanics
This chapter describes the mechanical dimensions of SIM340.
7.1 Mechanical dimensions of SIM340
Following shows the Mechanical dimensions of SIM340 (top view, side view and bottom view).
Figure 35: Mechanical dimensions of module（Unit: mm）
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Figure 36: Mechanical dimensions of module PCB decal（Unit: mm）
7.2 Mounting SIM340 onto the application platform
Use the connector ENTERY 1008-G60N-01R or JXT 210-106001-001to fix the SIM340 onto the
customer platform.
7.3 Board-to-board connector
We recommend to use ENTERY Company’s 1008-G60N-01R or JXT’s 210-106001-001 as the
board-to-board connector. They are fully compatible each other. This high density SMT connector
is designed for parallel PCB-to-PCB applications. It is ideal to use in VCRs, notebook PCs,
cordless telephones, mobile phones, audio/visual and other telecommunications equipment where
reduced size and weight are important. Following is parameter of 1008-G60N-01R and
210-106001-001. For more details, you can login http://www.entery.com.tw
http://www.jxt-china.com
for more information.
or
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7.3.1 Mechanical dimensions of the ENTERY 1008-G60N-01R
Figure 37: ENTERY 1008-G60N-01R board-to-board connector
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7.3.2 Mechanical dimensions of the JXT 210-106001-001
Figure 38: JXT 210-106001-001 board-to-board connector
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Figure 39: Board-to-board connector physical photo
NOTE：
The connector ENTERY 1009-G60N-01R or JXT 210-106001-002 is used in socket side
(module side) and ENTERY 1008-G60N-01R or JXT 210-100601-001 is used in pin side (user
side).
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7.4 RF adapter cabling
The RF connector in module side is Murata Company Microwave Coaxial Connectors
MM9329-2700RA1, it makes a pair with Murata Company RF connector MXTK. It has high
performance with wide frequency range, surface mountable and reflow solderable. Following is
parameter. Certainly you can visit http://www.murata.com/
for more information.
Figure 40: MM9329-2700B
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SIM340 Hardware Design
Figure 41: RF connector MXTK
For more information about the connector, please visit http://www.murata.com/
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7.5 Top view of the SIM340
Figure 42: Top view of the SIM340
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7.6 PIN assignment of board-to-board connector of SIM340
Table 33: Connection diagrams
PIN NO. PIN NAME I/O PIN NO. PIN NAME I/O
1
3
5
7
9
11
13
15
VBAT I
VBAT I
VBAT I
VBAT I
GND
GND
GND
10
12
14
VRTC I/O
2
4
6
8
VBAT I
VBAT I
VBAT I
VBAT I
GND
GND
GND
16
SIM_PRESE
I
NCE
17
19
21
23
25
27
29
VDD_EXT O
SIM_VDD O
SIM_DATA I/O
SIM_CLK O
SIM_RST O
KBC0 O
KBC1 O
18
20
22
24
26
28
30
DISP_DATA I/O
DISP_CLK O
DISP_CS O
DISP_D/C O
DISP_RST O
DCD O
NETLIGHT O
31
33
35
37
39
41
43
45
47
49
51
53
55
57
59
KBC2 O
KBC3 O
KBC4 O
KBR0 I
KBR1 I
KBR2 I
KBR3 I
KBR4 I
DBG_RXD I
DBG_TXD O
AGND
52
MIC1P I
MIC1N I
MIC2P I
MIC2N I
32
34
36
38
40
42
44
46
48
50
54
56
58
60
GPIO0 I/O
PWRKEY I
BUZZER O
DTR I
RXD I
TXD O
RTS I
CTS O
RI O
AGND
ADC0 I
SPK1P O
SPK1N O
SPK2P O
SPK2N O
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Contact us:
Shanghai SIMCom Wireless Solutions Ltd.
Add: SIM Technology Building, No. 700, Yishan Road, Shanghai, P. R. China
200233
Tel: +86 21 5427 8900
Fax: +86 21 5427 6035
URL: www.sim.com
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