Introduction; Sim900D Overview; Sim900D Key Features - SimCom SIM900D Hardware Design

1 Introduction

This document describes SIM900D hardware interface in great detail.
This document can help user to quickly understand SIM900D interface specifications, electrical and mechanical
details. With the help of this document and other SIM900D application notes, user guide, users can use SIM900D
to design various applications quickly.

2 SIM900D Overview

Designed for global market, SIM900D is a quad-band GSM/GPRS module that works on frequencies GSM
850MHz, EGSM 900MHz, DCS 1800MHz and PCS 1900MHz. SIM900D 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 33*33*3mm, SIM900D can meet almost all the space requirements in user
applications, such as M2M, smart phone, PDA, FWP, and other mobile devices.
SIM900D has 48 SMT pads, and provides all hardware interfaces between the module and customers' boards.
Serial port and debug port can help user easily develop user's applications.
Audio channel which includes two microphone inputs and two receiver outputs.
Programmable general purpose input and output.
The SPI display interface will give users the flexibility to develop customized applications.
SIM900D is designed with power saving technique so that the current consumption is as low as 1.0mA in sleep
mode.
SIM900D 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

SIM900D Key Features

Table 1: SIM900D key features
Feature
Power supply
Power saving
Frequency bands
SIM900D_Hardware Design_V2.02
Implementation
3.2V ~ 4.8V
Typical power consumption in sleep mode is 1.0mA ( BS-PA-MFRMS=9 )
SIM900D Quad-band: GSM 850, EGSM 900, DCS 1800, PCS 1900.
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Smart Machine Smart Decision
2012-05-07