SimTech SimCom SIM340 Supplement

Hardware Design
SIM340_HD_V3.09

SIM340 Hardware Design
Document Title: SIM340 Hardware Design
Version: 3.09
Date: 2009-3-18
Status: Release
Document Control ID: 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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SIM340 Hardware Design
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 anthony
2005-11-02 01.04 Add the SIM340 current consumption, modify the
Buzzer pin 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
detection
anthony
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
turning on system
anthony
2006-04-04 02.02 Modify the function of GPIO5 and BUZZER pins, the
10K resistance integrated in the VRTC pin.
Add the description of the Autobauding function
anthony
2006-05-09 02.03 Update Temperature range
Modify the mechanical dimensions of SIM340
Delete the description of MOLEX connector
Modify the figure of the SIM reference circuit
anthony
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
as the fix baud rate
anthony
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
PWRKEY
Modify the PIN name
anthony
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).
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.
Anthony.Yang
2007-09-05 03.07 Add order information
Add why we used SIM340 on SIM300-EVB. chenbo
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
anyong
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.
Lvning
2009-3-18 03.09 Modify Figure 1: delete ghost KROW4 key.
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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:
Serial asynchronous automatic dialing and control
[3] GSM 07.07: Digital cellular telecommunications (Phase 2+); AT command
set for GSM Mobile Equipment (ME)
[4] GSM 07.10: Support GSM 07.10 multiplexing protocol
[5] GSM 07.05: Digital cellular telecommunications (Phase 2+); Use of Data
Terminal Equipment – Data Circuit terminating Equipment
(DTE – DCE) interface for Short Message Service (SMS) and
Cell Broadcast Service (CBS)
[6] GSM 11.14: Digital cellular telecommunications system (Phase 2+);
Specification of the SIM Application Toolkit for the Subscriber
Identity Module – Mobile Equipment (SIM – ME) interface
[7] GSM 11.11: Digital cellular telecommunications system (Phase 2+);
Specification of the Subscriber Identity Module – Mobile
Equipment (SIM – ME) interface
[8] GSM 03.38: Digital cellular telecommunications system (Phase 2+);
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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SIM340 Hardware Design
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
Vimax Absolute Maximum Input Voltage Value
Vimin 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 (1)
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
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
Flash+
SRAM Baseband
Engine
Radio
Frequency
Board-to-board Connector
LCD
KEYPADS
AUDIO
SIM
ADC
UART
GPIO
POWER
SIM340
Antenna
connector
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
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Figure 3: Top view of SIM300 EVB
For details please refer to the SIM300-EVB_UGD document.

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
Vmax= 4.5V
Vmin=3.4V
Vnorm=4.0V
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=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.
Vmax=3.0V
Vmin=2.75V
Vnorm=2.93V
Imax=10mA
If unused
keep pin open
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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.
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.
VILmax=0.2*VBAT
VIHmin=0.6*VBAT
VImax=VBAT
pull up to
VBAT
Audio interfaces
PIN NAME I/O DESCRIPTION DC CHARACTERISTICS DC
MIC1P
MIC1N
I Positive and negative voice-band
input
MIC2P
MIC2N
I Auxiliary positive and negative
voice-band input
If unused
keep pins
open
SPK1P
SPK1N
O Positive and negative voice-band
output
SPK2P
SPK2N
O Auxiliary positive and negative
voice-band output
Audio DC Characteristics
refer to chapter 3.9.4
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
O/4mA Tri-out, If
unused keep
pins open
KBR0~KB
R4
I/4mA
Keypad interface
Pull up to
VEXT, if
unused keep
pins open
DISP_DAT I/O/4m LCD display 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 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/4m
A
Normal input/output port
If unused
keep pins
open
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
CTS O/8mA Clear to send
RI O/8mA Ring indicator
DCD O/4mA Data carrier detection
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
If use only
TXD,RXD
GND three
pins to
communicate,
RTS pin
connect to
GND directly.
DTR pin is
pull up to
VEXT with
100K
If unused
keep pins
open
Debug port
DBG_TXD O/4mA
DBG_RXD I/4mA
Serial interface for debugging only If unused
keep pins
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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