Smart Machine Smart Decision
SIM900-DS_Hardware Design_V1.00
8
2013-01-20
1
Introduction
This document describes SIM900-DS hardware interface in great detail.
This document can help user to quickly understand SIM900-DS interface specifications, electrical and mechanical
details. With the help of this document and other SIM900-DS application notes, users can use SIM900-DS to
design various applications quickly.
2
SIM900-DS Overview
Designed for global market, SIM900-DS is a quad-band GSM/GPRS module that works on frequencies GSM
850MHz, EGSM 900MHz, DCS 1800MHz and PCS 1900MHz. SIM900-DS features GPRS multi-slot class 10/
class 8 (optional) and supports the GPRS coding schemes CS-1, CS-2, CS-3 and CS-4.
SIM900-DS with special features, Dual-SIM Dual-Standby, which allows customers to use two SIM cards in one
device simultaneously.
With a tiny configuration of 24*24*3mm, SIM900-DS can meet almost all the space requirements in user
applications, such as M2M, smart phone, PDA and other mobile devices.
SIM900-DS has 68 SMT pads, and provides all hardware interfaces between the module and customers’ boards.
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Serial port and debug port
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Two analog audio channels
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PCM interface
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Programmable general purpose input and output.
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The SPI display interface
SIM900-DS is designed with power saving technique so that the current consumption is as low as 1.5mA in sleep
mode.
SIM900-DS 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
SIM900-DS Key Features
Table 1: SIM900-DS key features
Feature
Implementation
Power supply
3.2V ~ 4.8V
Power saving
Typical power consumption in sleep mode is 1.5mA ( BS-PA-MFRMS=9 )
Frequency bands
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SIM900-DS Quad-band: GSM 850, EGSM 900, DCS 1800, PCS 1900.
SIM900-DS 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]
.
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Compliant to GSM Phase 2/2+
