Introduction; Sim900B Overview; Sim900B Key Features - SimCom SIM900B Hardware Design

1 Introduction

This document describes SIM900B hardware interface in great detail.
This document can help user to quickly understand SIM900B interface specifications, electrical and mechanical
details. With the help of this document and other SIM900B application notes, user guide, users can use SIM900B
to design various applications quickly.

2 SIM900B Overview

Designed for global market, SIM900B is a quad-band GSM/GPRS module 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*33mm *3mm, SIM900B can meet almost all the space requirements in user
applications, such as M2M, smart phone, PDA, FWP, 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.
Serial port and Debug port can help user easily develop the applications.
Two audio channels include two microphone inputs and two speaker outputs.
Programmable general purpose input and output.
The keypad and SPI display interface will give user the flexibility to develop customized applications.
SIM900B integrates TCP/IP protocol and extended TCP/IP AT commands which are very useful for data transfer
applications. For details about TCP/IP applications, please refer to document [2].
2.1

SIM900B Key Features

Table 1: SIM900B key features
Feature
Power supply
Power saving
Frequency bands
Transmitting power
GPRS connectivity
Temperature range
SIM900B_Hardware Design_V2.01
Implementation
3.2V ~ 4.8V
Typical power consumption in sleep mode is 1.0mA ( BS-PA-MFRMS=9 )
SIM900B Quad-band: GSM 850, EGSM 900, DCS 1800, PCS 1900.
SIM900B can search the 4 frequency bands automatically. The frequency
bands also can be set by AT command "AT+CBAND". For details, please
refer to document [1].
Compliant to GSM Phase 2/2+
Class 4 (2W) at GSM 850 and EGSM 900
Class 1 (1W) at DCS 1800 and PCS 1900
GPRS multi-slot class 10（default）
GPRS multi-slot class 8 (option)
Normal operation: -30°C ~ +80°C
8
Smart Machine Smart Decision
2012-05-07