SimCom SIM808, Проектирование аппаратного обеспечения

Страница: 10 / 67

Smart Machine Smart Decision
SIM808_Hardware Design_V1.00 2014.03.27 10
1 Introduction
This document describes SIM808 hardware interface in great detail. This document can help user to quickly
understand SIM808 interface specifications, electrical and mechanical details. With the help of this document and
other SIM808 application notes, user guide, users can use SIM808 to design various applications quickly.
2 SIM808 Overview
Designed for global market, SIM808 is integrated with a high performance GSM/GPRS engine, a GPS engine and
a BT engine. The GSM/GPRS engine is a quad-band GSM/GPRS module that works on frequencies GSM
850MHz, EGSM 900MHz, DCS 1800MHz and PCS 1900MHz. SIM808 features GPRS multi-slot class 12/ class
10 (optional) and supports the GPRS coding schemes CS-1, CS-2, CS-3 and CS-4. The GPS solution offers best-
in-class acquisition and tracing sensitivity, Time-To-First-Fix (TTFF) and accuracy.
With a tiny configuration of 24*24*2.6mm, SIM808 can meet almost all the space requirements in user
applications, such as M2M, smart phone, PDA, tracker and other mobile devices.
SIM808 has 68 SMT pads, and provides all hardware interfaces between the module and customers’ boards.
z Support 4*4*2 keypads.
z One full modem serial port.
z One USB, the USB interfaces can debug, download software.
z Audio channels which include a microphone input and a receiver output.
z One SIM card interface.
z Charging interface.
z Programmable general purpose input and output.
z Support Bluetooth function.
z Support PWM and ADC.
z PCM/SPI/SD card interface, only one function can be accessed synchronously. (Default function is PCM).
SIM808 is designed with power saving technique so that the current consumption is as low as 1mA in sleep mode
(GPS engine is powered down).
SIM808 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 SIM808 Key Features
Table 1: SIM808 GSM/GPRS engine key features
Feature Implementation
Power supply 3.4V ~ 4.4V
Power saving
Typical power consumption in sleep mode is 1mA ( BS-PA-MFRMS=9, GPS
engine is powered down )
Charging Supports charging control for Li-Ion battery
Frequency bands z SIM808 Quad-band: GSM 850, EGSM 900, DCS 1800, PCS 1900. SIM808