a
Hardware Design
SIM300_HD_V4.02
SIM300 Hardware Design
Document Title:
Version:
Date:
Status:
Document Control ID:
SIM300 Hardware Design
4.02
2009-3-18
Release
SIM300_HD_V4.02
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
SIM300_HD_V4.02 18.03.2009
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SIM300 Hardware Design
Contents
Contents ............................................................................................................................................3
Version history..................................................................................................................................7
1 Introduction....................................................................................................................................9
1.1 Related documents ...............................................................................................................9
1.2 Terms and abbreviations.....................................................................................................10
2 SIM300 overview.........................................................................................................................13
2.1 SIM300 key features ..........................................................................................................14
2.2 SIM300 functional diagram ...............................................................................................15
2.3 SIM300 evaluation board...................................................................................................16
3 Application interface....................................................................................................................18
3.1 SIM300 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 .................................................................................25
3.4.1 Turn on SIM300 .......................................................................................................25
3.4.2 Turn off SIM300 ......................................................................................................27
3.4.3 Restart SIM300 using the PWRKEY pin .................................................................30
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 SIM300 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......................................................37
3.8.2 Software upgrade and software debug......................................................................38
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 .............................................................................42
3.9.4 Referenced electronic characteristic.........................................................................42
3.10 Buzzer ..............................................................................................................................43
3.11 SIM card interface............................................................................................................44
3.11.1 SIM card application ..............................................................................................44
3.11.2 Design considerations for SIM card holder............................................................46
3.12 LCD display interface ......................................................................................................48
3.13 Keypad interface ..............................................................................................................48
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SIM300 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) ..........................................................................51
4 Antenna interface .........................................................................................................................53
4.1 Antenna installation............................................................................................................53
4.1.1 Antenna connector....................................................................................................53
4.1.2 Antenna pad..............................................................................................................54
4.2 Module RF output power ...................................................................................................54
4.3 Module RF receive sensitivity............................................................................................54
4.4 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 Mechanics ....................................................................................................................................59
6.1 Mechanical dimensions of SIM300....................................................................................59
6.2 Mounting SIM300 onto the application platform...............................................................60
6.3 Board-to-board connector ..................................................................................................60
6.3.1 Mechanical dimensions of the ENTERY 1008-G60N-01R .....................................61
6.3.2 Mechanical dimensions of the JXT 210-106001-001...............................................62
6.4 RF connector ......................................................................................................................64
6.5 Top view of the SIM300.....................................................................................................66
6.6 PIN assignment of board-to-board connector of SIM300..................................................67
SIM300_HD_V4.02 18.03.2009
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SIM300 Hardware Design
Table Index
TABLE 1: RELATED DOCUMENTS..................................................................................................... 9
TABLE 2: TERMS AND ABBREVIATIONS .......................................................................................10
TABLE 3: SIM300 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 .....................................36
TABLE 11: PIN DEFINE OF THE AUDIO INTERFACE ....................................................................39
TABLE 12: MIC INPUT CHARACTERISTICS...................................................................................42
TABLE 13: AUDIO OUTPUT CHARACTERISTICS..........................................................................42
TABLE 14: BUZZER OUTPUT CHARACTERISTICS .......................................................................44
TABLE 15: PIN DEFINE 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 DEFINE OF THE LCD INTERFACE......................................................................... 48
TABLE 19: PIN DEFINE 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 DEFINE OF THE GPIO INTERFACE .......................................................................52
TABLE 24: SIM300 CONDUCTED RF OUTPUT POWER................................................................. 54
TABLE 25: SIM300 CONDUCTED RF RECEIVE SENSITIVITY ..................................................... 54
TABLE 26: SIM300 OPERATING FREQUENCIES ............................................................................54
TABLE 27: ABSOLUTE MAXIMUM RATINGS.................................................................................55
TABLE 28: SIM300 OPERATING TEMPERATURE ........................................................................... 55
TABLE 29: SIM300 POWER SUPPLY RATINGS ...............................................................................56
TABLE 30: SIM300 CURRENT CONSUMPTION ..............................................................................57
TABLE 31: THE ESD ENDURE STATUE MEASURED TABLE (TEMPERATURE: 25℃,
HUMIDITY:45% ) .........................................................................................................................58
TABLE 32: CONNECTION DIAGRAMS ............................................................................................67
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SIM300 Hardware Design
Figure Index
FIGURE 1: SIM300 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 SIM300 USING DRIVING CIRCUIT ............................................................. 25
FIGURE 7: TURN ON SIM300 USING BUTTON...............................................................................26
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 .................................................... 33
FIGURE 13: RTC SUPPLY FROM CAPACITOR ................................................................................33
FIGURE 14: PANASONIC EECEMOE204A CHARGE CHARACTERISTIC ...................................34
FIGURE 15: MAXELL TC614 CHARGE CHARACTERISTIC.......................................................... 34
FIGURE 16: SEIKO TS621 CHARGE CHARACTERISTIC............................................................... 35
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 ......................................................................... 39
FIGURE 21: SPEAKER INTERFACE CONFIGURATION .................................................................40
FIGURE 22: SPEAKER INTERFACE WITH AMPLIFIER CONFIGURATION ................................41
FIGURE 23: MICROPHONE INTERFACE CONFIGURATION ........................................................41
FIGURE 24: EARPHONE INTERFACE CONFIGURATION..............................................................42
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: SIM300 SERVICES AS RECEIVER................................................................................ 50
FIGURE 32: SIM300 SERVICES AS CALLER.................................................................................... 50
FIGURE 33: REFERENCE CIRCUIT OF NETLIGHT ........................................................................51
FIGURE 34: THE RF INTERFACE OF MODULE ..............................................................................53
FIGURE 35: MECHANICAL DIMENSIONS OF MODULE（UNIT: MM） .................................... 59
FIGURE 36: MECHANICAL DIMENSIONS OF MODULE PCB DECAL（UNIT: MM）..............60
FIGURE 37: ENTERY 1008-G60N-01R BOARD-TO-BOARD CONNECTOR .................................61
FIGURE 38: JXT 210-106001-001 BOARD-TO-BOARD CONNECTOR ..........................................62
FIGURE 39: BOARD-TO-BOARD CONNECTOR PHYSICAL PHOTO ...........................................63
FIGURE 40: MM9329-2700RA1...........................................................................................................64
FIGURE 41: MXTK SERIES RF ADAPTER CABLE ......................................................................65
FIGURE 42: TOP VIEW OF THE SIM300 ...........................................................................................66
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SIM300 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 SIM300 current consumption, modify the Buzzer
pin
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
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 SIM300_V7.02
Add support GPRS class 8, Modify the VDD_EXT level,
“RDY” out by set fixed baudrate, timing of the turn on
system
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
2006-05-09 02.03 Update Temperature range
Modify the mechanical dimensions of SIM300
Delete the description of MOLEX connector
Modify the figure of the SIM reference circuit
anthony
anthony
anthony
anthony
anthony
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 fixed 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 PWRKEY
Modify the PIN name
2006-11-09 03.04 Modify the audio output characteristics anthony
2007-01-09 03.05 Modify the SIM300 key features
Modify the overview of operating modes
Modify the MIC input characteristics
SIM300_HD_V4.01 7 14.02.2008
anthony
anthony
anthony
SIM300 Hardware Design
Modify the BUZZER & NETLIGHT reference circuits
Add the note in the chapter of the Serial Interfaces about
RTS
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,
Anthony.
Yang
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.
2007-10-25 03.07 Modify the figure 9: Timing of turning off system
(pulldown time of the PWRKEY from 2s-3s to 0.5s-1s)
anyong
Add notes about Restricted operation
2008-02-14 04.01 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
anyong
Remark on ”AT+CHFA” commands.
Add notes that LCD display interface function is option.
Add notes that keypad interface function is option.
Add notes that GPIO0 function is option.
Add the figure 34: The RF interface of module
2008-07-25 04.02 Modify the description about RF connector and RF adapter
cable in paragraph 6.4
Modify the mechanical dimension of the module and
Zhou
qiang
recommend PCB decal drawing.in paragraph 6.1
2009-3-18 04.02 Modify Figure 1: delete ghost KROW4 key.
SIM300_HD_V4.02 18.03.2009
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SIM300 Hardware Design
1 Introduction
This document describes the hardware interface of the SIMCom SIM300 module that connects to
the specific application and the air interface. As SIM300 can be integrated with a wide range of
applications, all functional components of SIM300 are described in great detail.
This document can help you quickly understand SIM300 interface specifications, electrical and
mechanical details. With the help of this document and other SIM300 application notes, user guide,
you can use SIM300 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_Serial Port AN_Serial Port
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SIM300 Hardware Design
1.2 Terms and abbreviations
Table 2: Terms and abbreviations
Abbreviation Description
ADC Analog-to-Digital Converter
AMR Adaptive Multi-Rate
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
SIM300_HD_V4.02 18.03.2009
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SIM300 Hardware Design
Abbreviation Description
kbps Kilo bits per second
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
SIM300_HD_V4.02 18.03.2009
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SIM300 Hardware Design
VOLmin Minimum Output Low Level Voltage Value
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
SIM300_HD_V4.02 18.03.2009
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SIM300 Hardware Design
2 SIM300 overview
Designed for global market, SIM300 is a Tri-band GSM/GPRS engine that works on frequencies
EGSM 900 MHz, DCS 1800 MHz and PCS 1900 MHz. SIM300 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 , SIM300 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.
z The keypad and SPI display interface will give you the flexibility to develop customized
applications.
z Serial port and Debug port can help you easily develop your applications.
z Two audio channels include two microphones’ inputs and two speakers’ outputs. This can be
easily configured by AT command.
The SIM300 provides RF antenna interface with alternatives: antenna connector and antenna pad.
The antenna connector is MURATA MM9329-2700RA1. And customer’s antenna can be soldered
to the antenna pad.
The SIM300 is designed with power saving technique so that the current consumption is as low as
2.5mA in SLEEP mode.
The SIM300 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.
SIM300_HD_V4.02 18.03.2009
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SIM300 Hardware Design
2.1 SIM300 key features
Table 3: SIM300 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
z SIM300 Tri-band: EGSM 900, DCS 1800, PCS 1900. The
SIM300 can search the 3 frequency bands automatically. The
frequency bands also can be set by AT command.
z Compliant to GSM Phase 2/2+
GSM class Small MS
Transmitting power z Class 4 (2W) at EGSM 900
z Class 1 (1W) at DCS 1800 and PCS 1900
GPRS connectivity
z GPRS multi-slot class 10 （default）
z GPRS multi-slot class 8 (option)
z GPRS mobile station class B
Temperature range
z Normal operation: -20°C to +60°C
z Restricted operation: -30°C to -20°C and +60°C to +80°C
z Storage temperature -40°C to +85°C
DATA GPRS:
CSD:
z GPRS data downlink transfer: max. 85.6 kbps
z GPRS data uplink transfer: max. 42.8 kbps
z Coding scheme: CS-1, CS-2, CS-3 and CS-4
z SIM300 supports the protocols PAP (Password Authentication
Protocol) usually used for PPP connections.
z The SIM300 integrates the TCP/IP protocol.
z Support Packet Switched Broadcast Control Channel (PBCCH)
z CSD transmission rates: 2.4, 4.8, 9.6, 14.4 kbps,
non-transparent
z Unstructured Supplementary Services Data (USSD) support
(1)
SMS z MT, MO, CB, Text and PDU mode
z 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:
z Half Rate (ETS 06.20)
z Full Rate (ETS 06.10)
z Enhanced Full Rate (ETS 06.50 / 06.60 / 06.80)
z Adaptive multi rate (AMR)
SIM300_HD_V4.02 18.03.2009
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SIM300 Hardware Design
z Echo Cancellation
Serial port and
Debug port
z Serial Port: Seven lines on Serial Port Interface
z Serial Port can be used for CSD FAX, GPRS service and send
AT command of controlling module.
z Serial Port can use multiplexing function.
z Autobauding supports baud rate from 4800 bps to 115200bps.
z Debug Port: Two lines on Serial Port Interface /TXD and /RXD
z 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 3.2±0.2mm (including application
connector)
40±0.15 x 33±0.15 x 2.9+0.3/-0.1mm (excluding application
connector)
Weight: 8g
Firmware upgrade Firmware upgrade by serial port.
(1) The SIM300 does work, but deviations from the GSM specification may occur, For example,
the frequency error or the phase error will be large.
4: Coding schemes and maximum net data rates over air interface
Table
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 SIM300 functional diagram
The following figure shows a functional diagram of the SIM300 and illustrates the mainly
functional part:
z The GSM baseband engine
z Flash and SRAM
z The GSM radio frequency part
z The antenna interface
z The board-to-board interface
SIM300_HD_V4.02 18.03.2009
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SIM300 Hardware Design
Antenna
SIM300
connector
Radio
Frequency
POWER
SIM
KEYPADS
Flash+
SRAM
Baseband
Engine
LCD
UART
GPIO
ADC
AUDIO
Figure 2: SIM300 functional diagram
Board-to-board Connector
2.3 SIM300 evaluation board
In order to help you on the application of SIM300, SIMCom can supply an Evaluation Board
(EVB) that interfaces the SIM300 directly with appropriate power supply, SIM card holder, RS232
serial port, handset port, earphone port, antenna and all GPIO of the SIM300.
SIM300_HD_V4.02 18.03.2009
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SIM300 Hardware Design
Figure 3: Top view of SIM300 EVB
For details please refer to the SIM300-EVB_UGD document.
SIM300_HD_V4.02 18.03.2009
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SIM300 Hardware Design
3 Application interface
SIM 300 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:
z Power supply (please refer to Chapter 3.3
z Serial interfaces (please refer to Chapter 3.8
z Two analog audio interfaces (please refer to Chapter 3.9
z 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 SIM300 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 SIM300 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
SIM300_HD_V4.02 18.03.2009
18
Vmax=3.0V
Vmin=2.75V
Vnorm=2.93V
If unused
keep pin open
SIM300 Hardware Design
power on or off. When the voltage
Imax=10mA
is low, the system is power off.
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
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
unused keep
pins open
Pull up to
VEXT, if
unused keep
SIM300_HD_V4.02 18.03.2009
19
SIM300 Hardware Design
VOHmin= VDD_EXT-0.2
DISP_DATA I/O/4m
A
DISP_CLK O/4mA
DISP_CS O/4mA
DISP_D/C O/4mA
LCD display interface
VOHmax= VDD_EXT
DISP_RST O/4mA
pins open
If unused
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
SIM300_HD_V4.02 18.03.2009
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SIM300 Hardware Design
b
PIN NAME I/O DESCRIPTION DC CHARACTERISTICS
SIM_VDD O Voltage supply for SIM card The voltage can be select
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
ADC0 I General purpose analog to digital
converter.
Input voltage range: 0V to
2.4V
All signals of
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.
If unused
keep pin open
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,
GSM TALK Connection is going on between two subscribers. In this case,
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.
the power consumption depends on network settings such as
DTX off/on, FR/EFR/HR, hopping sequences, antenna.
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SIM300 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, 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. SIM300 will not register to GSM network and only
parts of AT commands can be available.
3.3 Power supply
The power supply of SIM300 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 rises 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 SIM300
VBAT pins. The following figure is the recommended circuit.
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SIM300 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 SIM300
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.
Figure 5: 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
SIM300_HD_V4.02 18.03.2009
=1µF.
B
23
=100µF tantalum
A
SIM300 Hardware Design
577us
4.615ms
IVBAT
Burst:2A
VBAT
Max:400mV
Figure 6: 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 percentage 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]
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SIM300 Hardware Design
3.4 Power up and power down scenarios
3.4.1 Turn on SIM300
SIM300 can be turned on by various ways, which are described in following chapters:
z Via PWRKEY pin: starts normal operating mode (please refer to chapter 3.4.1.1);
z Via RTC interrupt: starts ALARM modes (please refer to chapter 3.4.1.2)
Note: The AT command must be set after the SIM300 is power on and Unsolicited Result Code
“RDY” is received from the serial port. However if the SIM300 is set autobauding, the serial
port will receive nothing. The AT command can be set in 2-3s after the SIM300 is power on.
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 Code “RDY” should be
received from the serial port all the time that the SIM300 is power on. Please refer to the
chapter AT+IPR in document [1].
3.4.1.1 Turn on SIM300 using the PWRKEY pin (Power on)
You can turn on the SIM300 by driving the PWRKEY to a low level voltage for some time and
then release. 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
4.7K
Turn on impulse
47K
Figure 7: Turn on SIM300 using driving circuit
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SIM300 Hardware Design
S1
PWRKEY
TVS1
Figure 8: Turn on SIM300 using button
The power on scenarios illustrates as following figure.
VBAT
Pulldown > 2s
Hiz
V
PWRKEY
(INPUT)
VIL<0.2*VBAT
> 0.6*VBAT
IH
VDD_EXT
（OUTPUT）
Figure 9: Timing of turn on system
When power on procedure completes, the SIM300 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.
3.4.1.2 Turn on SIM300 using the RTC (Alarm mode)
Alarm mode is a power-on approach by using the RTC. The alert function of RTC makes the
SIM300 wake up while the module is power off. In alarm mode, SIM300 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 in normal mode.
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SIM300 Hardware Design
Use the AT+CALARM command to set the alarm time. The RTC remains the alarm time if
SIM300 is power down by “AT+CPOWD=1” or by PWRKEY pin. Once the alarm time is expired
and executed, SIM300 will go into the alarm mode. In this case, SIM300 will send out an
Unsolicited Result Code (URC) when set as fixed baud rate:
RDY
ALARM MODE
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
will return 0 which indicates that the protocol stack is closed. Then after 90s, SIM300 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 SIM300 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 SIM300
Following procedure can be used to turn off the SIM300:
z Normal power down procedure: Turn off SIM300 using the PWRKEY pin
z Normal power down procedure: Turn off SIM300 using AT command
z Over-voltage or under-voltage automatic shutdown: Take effect if over-voltage or
under-voltage is detected
z Over-temperature or under-temperature automatic shutdown: Take effect if over-temperature
or under-temperature is detected
3.4.2.1 Turn off SIM300 using the PWRKEY pin (Power down)
You can turn off the SIM300 by driving the PWRKEY to a low level voltage for some time. Please
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SIM300 Hardware Design
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 allows the software 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.
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 SIM300 using AT command
You can use an AT command “AT+CPOWD=1” to turn off the module. This command lets the
module log off from the network and allows 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
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28
SIM300 Hardware Design
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.
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.
SIM300_HD_V4.02 18.03.2009
29
SIM300 Hardware Design
For details please refer to document [1]
3.4.3 Restart SIM300 using the PWRKEY pin
You can restart SIM300 by driving the PWRKEY to a low level voltage for some time, the same
as turning on SIM300 using the PWRKEY pin. Before restarting the SIM300, you need delay at
least 500ms from detecting the VDD_EXT low level on. The restarting scenario illustrates as the
following figure.
PWRKEY
（INPUT）
Turn off
Delay > 500ms
H
Restart
Pull down the PWRKEY
VDD_EXT
to turn on the module
（OUTPUT）
VIL<0.3*VDD_EXT
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
z 0: minimum functionality;
z 1: full functionality (default);
z 4: disable phone both transmit and receive RF circuits;
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SIM300 Hardware Design
If SIM300 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 SIM300 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 SIM300 has been set by “AT+CFUN=0” or “AT+CFUN=4”, it can return to full
functionality by “AT+CFUN=1”.
For detailed information about “AT+CFUN”, please refer to document [1].
3.5.2 Sleep mode (slow clock mode)
We can control SIM300 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), SIM300 will enter SLEEP mode automatically. In this mode, SIM300 can
still receive paging or SMS from network but the serial port is not accessible.
Note: For SIM300, 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 SIM300 from SLEEP mode
When SIM300 is in SLEEP mode, the following methods can wake up the module.
z Enable DTR pin to wake up SIM300.
If DTR pin is pulled down to a low level
，this signal will wake up SIM300 from power
saving mode. The serial port will be active after DTR changed to low level for about 40ms.
z Receiving a voice or data call from network to wake up SIM300.
z Receiving a SMS from network to wake up SIM300.
z RTC alarm expired to wake up SIM300.
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 POWER DOWN Normal Alarm mode
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31
SIM300 Hardware Design
Current mode
mode
POWER DOWN Use
PWRKEY
Normal mode AT+CPOWD or
Set alarm by “AT+CALARM”, and
use PWRKEY pin
Switch on from POWER DOWN
mode by RTC
then switch off the module. When the
timer expires, the module turns on
and enters Alarm mode
Alarm mode Use PWRKEY
pin or wait
Use
AT+CFUN
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 SIM300 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.
Non-chargeable
Backup Battery
MODULE
VRTC
Figure 12: RTC supply from non-chargeable battery
10K
RTC
Core
SIM300_HD_V4.02 18.03.2009
32
SIM300 Hardware Design
MODULE
Rechargeable
Backup Battery
Figure 13: RTC supply from rechargeable battery
Large-capacitance
Capacitor
VRTC
VRTC
10K
MODULE
10K
RTC
Core
RTC
Core
Figure 14: RTC supply from capacitor
z 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.
SIM300_HD_V4.02 18.03.2009
33
SIM300 Hardware Design
Figure 15: Panasonic EECEMOE204A Charge Characteristic
Figure 16: Maxell TC614 Charge Characteristic
SIM300_HD_V4.02 18.03.2009
34
SIM300 Hardware Design
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.
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
SIM300 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),
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35
SIM300 Hardware Design
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
z TXD: Send data to the RXD signal line of the DTE
z RXD: Receive data from the TXD signal line of the DTE
Debug port
z DBG_TXD: Send data to the /RXD signal line of the DTE
z DBG_RXD: Receive data from the /TXD signal line of the DTE
The logic levels are described in following table
Table 10: Logic levels of the serial port and debug port
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
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.
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SIM300 Hardware Design
3.8.1 Function of serial port & debug port supporting
Serial port
z Seven lines on serial port.
z Contains data lines TXD and RXD, State lines RTS and CTS, Control lines DTR, DCD and
RI.
z 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. SIM300 supports only basic
mode of multiplexing so far.
z Serial port supports the communication rates as following:
300, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200 Default as 115200bps.
z 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.
Restrictions on autobauding operation
z The serial port has to be operated at 8 data bits, no parity and 1 stop bit (factory setting).
z 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 SIM300 is
power on.
Debug port
z Two lines on Debug port
z Only contains Data lines /TXD and /RXD
z 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.
z Debug port supports the communication rates as following:
9600, 19200, 38400, 57600, 115200bps
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SIM300 Hardware Design
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
upgrade and the DBG_TXD
、 DBG_RXD for software debugging. The PWRKEY pin is
、RXD should be used for software
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 SIM300 is
upgrading software. Please refer to the following figures.
Figure 19: Connection of software upgrade
Figure 20: Connection of software debug
The serial port and the debug port don’t support the RS_232 level and it only supports the CMOS
level. Please refer to the table 9 for details about the voltage level. You should add the level
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SIM300 Hardware Design
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
Note：For detail information about serial port application, please refer to document [10]
3.9 Audio interfaces
Table 11: Pin define of the Audio interface
Name Pin Function
(AIN1/AOUT1)
(AIN2/AOUT2)
MIC1P 53 Microphone1 input +
MIC1N 55 Microphone1 input -
SPK1P 54 Audio1 output+
SPK1N 56 Audio1 output-
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 is 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
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SIM300 Hardware Design
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:
0— AIN1/AOUT1 (normal audio channel), the default value is 0.
1— 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.
3.9.1 Speaker interface configuration
Figure 22: Speaker interface configuration
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SIM300 Hardware Design
Figure 23: Speaker interface with amplifier configuration
3.9.2 Microphone interfaces configuration
Close to Microphone
GND
GND
Differential layout
10pF
MODULE
MICxP
MICxN
AGND
AGND
10pF
10pF
GND
GND
33pF
33pF
33pF
GND
ESD
ANTI
Electret
Microphone
ESD
ANTI
GND
Figure 24: Microphone interface configuration
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SIM300 Hardware Design
3.9.3 Earphone interface configuration
Close to Socket
Close to MODULE
MIC2N
MIC2P
Differential
MODULE
SPK2P
1uF
AGND
33pF 33pF
AGND
3.9.4 Referenced electronic characteristic
10R
GNDGND
Figure 25: Earphone interface configuration
layout
GND
AGND
GND
3
4
2
1
Amphenol
9001-8905-050
33pF
33pF 10pF
GND
GND
GND
33pF
68R
GND
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
Output(SPK1)
Single
Ended
load
Resistance
Nominal
Output
27 32 Ohm Normal
0.5477
-12.04
Vpp
dBm
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Level
(PGA=0dB)
Auxiliary
Output(SPK2)
Ended
Differential
load
Resistance
Nominal
Output
Level
(PGA=0dB)
load
Resistance
Nominal
Output
Level
(PGA=0dB)
load
Resistance
Nominal
Output
Level
(PGA=0dB)
27 32 Ohm Differential
1.0954
-6.02
Vpp
dBm
27 32 Ohm Single
0.5477
-12.04
Vpp
dBm
27 32 Ohm
1.0954
-6.02
Vpp
dBm
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
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SIM300 Hardware Design
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).
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
Table 15: Pin define of the SIM interface
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
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SIM300 Hardware Design
close 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.
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
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SIM300 Hardware Design
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
http://www.amphenol.com
for more information about the holder.
Figure 29: Amphenol C707 10M006 512 2 SIM card holder
16: Pin description (Amphenol 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
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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SIM300 Hardware Design
Figure 30: Molex 91228 SIM card holder
Table 17: Pin description (Molex 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
C4
C5
C6
C7
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
C8
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3.12 LCD display interface
SIM300 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.
Table 18: Pin define of the LCD interface
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 some 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).
Table 19: Pin define of the keypad interface
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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SIM300 Hardware Design
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
SIM300 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 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 accuracy1 0.59 mV
Sampling rate 5 Sec
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(1): 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
Figure 32: SIM300 Services as Receiver
Figure 33: SIM300 Services as caller
Ring
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SIM300 Hardware Design
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 SIM300 function
Off SIM300 is not running
64ms On/ 800ms Off SIM300 does not find the network
64ms On/ 3000ms Off SIM300 find the network
64ms On/ 300ms Off GPRS communication
We provide a reference circuit for you, shown as following figure:
VBAT
MODULE
4.7K
NETLIGHT
47K
Figure 34: Reference circuit of NETLIGHT
3.17 General purpose input & output (GPIO)
SIM300 provides a limited number of General Purpose Input/Output signal pin.
300R
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SIM300 Hardware Design
Table 23: Pin define 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
SIM300 offers alternatives:
z Recommended approach: antenna connector on the component side of the PCB
z Antenna pad and grounding plane placed on the bottom side.
Figure 35: The RF interface of module
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 requirements:
z GSM900<1dB
z DCS1800/PCS1900<1.5dB
4.1 Antenna installation
4.1.1 Antenna connector
SIM300 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.
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SIM300 Hardware Design
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, SIM300 comes with a grounding plane located close to the antenna pad.
SIM300 material properties:
SIM300 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.
4.2 Module RF output power
Table 24: SIM300 conducted RF output power
Frequency Max Min
EGSM900 33dBm ±2db 5dBm±5db
DCS1800 30dBm ±2db 0dBm±5db
PCS1900 30dBm ±2db 0dBm±5db
4.3 Module RF receive sensitivity
Table 25: SIM300 conducted RF receive sensitivity
Frequency Receive sensitivity
EGSM900 < -106dBm
DCS1800 < -106dBm
PCS1900 < -106dBm
4.4 Module operating frequencies
Table 26: SIM300 operating frequencies
Frequency Receive Transmit
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 SIM300 are
listed in following table:
Table 27: Absolute maximum ratings
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: SIM300 operating temperature
Parameter Min Typ Max Unit
Ambient temperature -20 25 60 ℃
Restricted operation* -30 to -20 60 to 80 ℃
Storage temperature -40 85 ℃
* The SIM300 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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SIM300 Hardware Design
5.3 Power supply ratings
Table 29: SIM300 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
EGSM 900
DCS1800/PCS1900
TALK mode
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 Tx
burst)
DATA mode, GPRS (3 Rx,2Tx)
EGSM 900
DCS1800/PCS1900
DATA mode, GPRS (4 Rx,1Tx)
EGSM 900
DCS1800/PCS1900
Power control level for Pout
max.
490
mA
340
290
mA
220
2 A
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SIM300 Hardware Design
5.4 Current consumption
The values for current consumption listed below refer to Table 28.
Table 30: SIM300 current consumption
Voice Call
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
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
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
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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SIM300 Hardware Design
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 SIM300 module.
The measured values of SIM300 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
RXD, TXD ±2KV ±4KV
Antenna port ±2KV ±4KV
SPK1P/1N, SPK2P/2N,
MIC1P/1N, MIC2P/2N,
Other port ±1KV
±1KV ±2KV
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SIM300 Hardware Design
6 Mechanics
This chapter describes the mechanical dimensions of SIM300.
6.1 Mechanical dimensions of SIM300
Following shows the Mechanical dimensions of SIM300 (top view, side view and bottom view).
Figure 36: Mechanical dimensions of module（Unit: mm）
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SIM300 Hardware Design
Figure 37: Mechanical dimensions of module PCB decal（Unit: mm）
6.2 Mounting SIM300 onto the application platform
Use the connector ENTERY 1008-G60N-01R or JXT 210-106001-001to fix the SIM300 onto the
customer platform.
6.3 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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SIM300 Hardware Design
6.3.1 Mechanical dimensions of the ENTERY 1008-G60N-01R
Figure 38: ENTERY 1008-G60N-01R board-to-board connector
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6.3.2 Mechanical dimensions of the JXT 210-106001-001
Figure 39: JXT 210-106001-001 board-to-board connector
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SIM300 Hardware Design
Figure 40: 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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6.4 RF connector
The RF connector in module side is a ultra-miniature SMT GSC Type Microwave Coaxial
Connector (Part Number: MM9329-2700RA1, vended by Murata), It has high performance with
wide frequency range, surface mountable and reflows solderable. Following is parameter (Figure
40). Certainly you can visit http://www.murata.com/
To get good RF performance in customer’s design, we suggest the customer to use the matching
RF adapter cable which is also supplied by murata (Part Number: MXTK92 or MXTK88), the
following figure 41 is the dimensions of MXTK series RF adapter cable. The customer can get it
from the cable’s manufacturer murata, and for details, please visit http://www.murata.com/
for more information.
.
Figure 41: MM9329-2700RA1
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SIM300 Hardware Design
Figure 42: MXTK series RF adapter cable
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SIM300 Hardware Design
6.5 Top view of the SIM300
Figure 43: Top view of the SIM300
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6.6 PIN assignment of board-to-board connector of SIM300
Table 32: Connection diagrams
PIN NO. PIN NAME I/O PIN NO. PIN NAME I/O
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
VBAT I
VBAT I
VBAT I
VBAT I
GND
GND
GND
VRTC I/O
VDD_EXT O
SIM_VDD O
SIM_DATA I/O
SIM_CLK O
SIM_RST O
KBC0 O
KBC1 O
10
12
14
2
4
6
8
16
18
20
22
24
26
28
30
VBAT I
VBAT I
VBAT I
VBAT I
GND
GND
GND
SIM_PRESE
NCE
DISP_DATA I/O
DISP_CLK O
DISP_CS O
DISP_D/C O
DISP_RST O
DCD O
NETLIGHT O
I
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
MIC1P I
MIC1N I
MIC2P I
MIC2N I
52
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/wm
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