User's Manual

SIM900B Hardware Design
2 SIM900B Overview
Designed for global market, SIM900B is a quad-band GSM/GPRS engine that works on frequencies GSM
850MHz, EGSM 900MHz, DCS 1800MHz and PCS 1900MHz. SIM900B 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 3mm, SIM900B 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 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 a microphone input and a speaker output.
z Programmable general purpose input & output.
The SIM900B is designed with power saving technique so that the current consumption is as low as 1.2mA in
SLEEP mode.
The SIM900B 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 SIM900B Key Features
Table 3: SIM900B key features
Feature Implementation
Power supply Single supply voltage :3.1V – 4.8V
Power saving Typical power consumption in SLEEP mode is 1.2mA ( BS-PA-MFRMS=5)
Frequency Bands z Quad-band: GSM 850, EGSM 900, DCS 1800, PCS 1900. The SIM900B 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
SIM900B_HD_V1.03 24.06.2010
13