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SIMcom
SIMcom

SIM900 Datasheet

Hardware Design


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SIM900_Hardware Design_V2.00
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Page 1

Document Title
Version
Date
Status
Document Control ID
SIM900 Hardware Design
2.00
2010-12-15
Release
SIM900_Hardware Design_V2.00
Smart Machine Smart Decision
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. 2010
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Smart Machine Smart Decision
Contents
Contents.................................................................................................................................................................... 3
Version History ........................................................................................................................................................ 7
1 Introduction....................................................................................................................................................... 8
2 SIM900 Overview ............................................................................................................................................. 8
2.1 SIM900 Key Features............................................................................................................................... 8
2.2 Operating Modes .................................................................................................................................... 10
2.3 SIM900 Functional Diagram ...................................................................................................................11
3 Package Information ...................................................................................................................................... 12
3.1 Pin out Diagram...................................................................................................................................... 12
3.2 Pin Description ....................................................................................................................................... 13
3.3 Package Dimensions............................................................................................................................... 15
4 Application Interface...................................................................................................................................... 16
4.1 Power Supply.......................................................................................................................................... 16
4.1.1 Minimizing Voltage Drop of VBAT ................................................................................................... 17
4.1.2 Monitoring Power Supply ................................................................................................................... 17
4.2 Power on/down Scenarios ...................................................................................................................... 17
4.2.1 Power on SIM900 ............................................................................................................................... 17
4.2.2 Power down SIM900........................................................................................................................... 18
4.2.3 Restart SIM900 by PWRKEY Pin ...................................................................................................... 20
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4.3 Power Saving Mode................................................................................................................................ 20
4.3.1 Minimum Functionality Mode ............................................................................................................ 20
4.3.2 Sleep Mode 1 (AT+CSCLK=1) .......................................................................................................... 21
4.3.3 Wake Up SIM900 from Sleep Mode 1 (AT+CSCLK=1) ................................................................... 21
4.3.4 Sleep Mode 2 (AT+CSCLK=2) .......................................................................................................... 21
4.3.5 Wake Up SIM900 from Sleep Mode 2 (AT+CSCLK=2) ................................................................... 22
4.4 RTC Backup ........................................................................................................................................... 22
4.5 Serial Interfaces ...................................................................................................................................... 23
4.5.1 Function of Serial Port and Debug Port .............................................................................................. 24
4.5.2 Software Upgrade and Debug ............................................................................................................. 25
4.6 Audio Interfaces ..................................................................................................................................... 25
4.6.1 Speaker Interface Configuration ......................................................................................................... 25
4.6.2 Microphone Interfaces Configuration ................................................................................................. 26
4.6.3 Earphone Interface Configuration....................................................................................................... 27
4.6.4 Audio Electronic Characteristics......................................................................................................... 27
4.7 SIM Card Interface ................................................................................................................................. 28
4.7.1 SIM Card Application ......................................................................................................................... 28
4.7.2 Design Considerations for SIM Card Holder ...................................................................................... 29
4.8 LCD Display/SPI Interface..................................................................................................................... 30
4.9 Keypad Interface .................................................................................................................................... 31
4.10 ADC........................................................................................................................................................ 32
4.11 RI Behaviors........................................................................................................................................... 32
4.12 Network Status Indication ...................................................................................................................... 33
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Smart Machine Smart Decision
4.13 General Purpose Input/Output (GPIO) ................................................................................................... 34
4.14 External Reset......................................................................................................................................... 34
4.15 PWM ...................................................................................................................................................... 35
4.16 I2C Bus.................................................................................................................................................... 35
4.17 Antenna Interface ................................................................................................................................... 35
5 Electrical, Reliability and Radio Characteristics......................................................................................... 37
5.1 Absolute Maximum Ratings................................................................................................................... 37
5.2 Recommended Operating Conditions..................................................................................................... 37
5.3 Digital Interface Characteristics ............................................................................................................. 37
5.4 SIM Card Interface Characteristics ........................................................................................................ 37
5.5 VDD_EXT Characteristics ..................................................................................................................... 38
5.6 SIM_VDD Characteristics...................................................................................................................... 38
5.7 VRTC Characteristics ............................................................................................................................. 38
5.8 Current Consumption (VBAT = 3.8V) ................................................................................................... 39
5.9 Electro-Static Discharge ......................................................................................................................... 40
5.10 Radio Characteristics.............................................................................................................................. 40
5.10.1 Module RF Output Power................................................................................................................ 40
5.10.2 Module RF Receive Sensitivity ....................................................................................................... 41
5.10.3 Module Operating Frequencies........................................................................................................ 42
6 Manufacturing ................................................................................................................................................ 43
6.1 Top and Bottom View of SIM900 .......................................................................................................... 43
6.2 Typical Solder Reflow Profile................................................................................................................ 43
6.3 Moisture Sensitivity Level (MSL).......................................................................................................... 43
Appendix ................................................................................................................................................................ 44
A. Related Documents........................................................www..Data.Shee.t.co.k.r .............................................................................. 44
B. Terms and Abbreviations ................................................................................................................................. 45
C. Safety Caution ................................................................................................................................................. 46
SIM900_Hardware Design_V2.00
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2010-12-15
Datasheet pdf - http://www.DataSheet4U.net/
Page 4
Part Number SIM900
Manufactur SIMcom
Description Hardware Design
Total Page 47 Pages
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