Hardware Design V1.01(091226)

SIM900 Hardware Design
2 SIM900 Overview
Designed for global market, SIM900 is a quad-band GSM/GPRS engine that works on frequencies GSM 850MHz,
EGSM 900MHz, DCS 1800MHz and PCS 1900MHz. SIM900 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 24mm x 24mm x 3mm, SIM900 can meet almost all the space requirements in your
applications, such as M2M, smart phone, PDA and other mobile devices.
The physical interface to the mobile application is a 68-pin SMT pad, which provides all hardware interfaces
between the module and customers’ boards.
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 One audio channel includes a microphone input and a speaker output.
The SIM900 is designed with power saving technique so that the current consumption is as low as 1.5mA in
SLEEP mode.
The SIM900 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.
2.1 SIM900 Key Features
Table 3: SIM900 key features
Feature Implementation
Power supply Single supply voltage 3.4V – 4.5V
Power saving Typical power consumption in SLEEP mode is 1.5mA ( BS-PA-MFRMS=5 )
Frequency Bands z SIM900 quad-band: GSM 850,EGSM 900, DCS 1800, PCS 1900. The
SIM900 can search the 4 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 GSM 850 and 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: -30°C to +80°C
SIM900_HD_V1.01 26.12.2009
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