Smart Machine Smart Decision
SIM868_Series_Hardware_Design_V1.06
10
2017-07-13
1.
Introduction
This document defines the SIM868 series module and describes its hardware interface in great detail. The
SIM868 series module includes two variants (SIM868 and SIM868E) currently. Both of them have the same
function except BLE, which is particular for SIM868E. SIM868 series is hereinafter uniformly referred to as the
SIM868 except in BT chapters.
The document can help customers understand SIM868 interface specifications, electrical and mechanical details.
With the help of this document and other SIM868 application notes, customer guide, customers can use SIM868
to design various applications conveniently.
2.
SIM868 Overview
Designed for global market, SIM868 is integrated with a high performance GSM/GPRS part and a GNSS part.
The GSM part is a quad-band GSM/GPRS that works on frequencies GSM 850 MHz, EGSM 900MHz, DCS
1800MHz and PCS 1900MHz. GSM 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 GNSS part solution offers best-in-class acquisition and tracing sensitivity, Time-To-First-Fix (TTFF) and
accuracy. With built-in LNA, GNSS doesn’t need external LNA. GNSS can track as low as -167dBm signal even
without network assistance. The GNSS has excellent low power consumption characteristic (acquisition 24mA,
tracking 22mA). GNSS supports various location and navigation applications, including autonomous GPS,
GLONASS, BEIDOU, QZSS, SBAS (WAAS, EGNOS, GAGAN, and MSAS) and A-GPS.
With a tiny configuration of 17.6*15.7*2.3mm, SIM868 can meet almost all the space requirements in
customers’ applications, such as smart phone, PDA and other mobile devices.
SIM868 has a SMT+LGA package with 77 pads, and provides all hardware interfaces between the module and
customers’ boards.
One three-line serial port, one full modem serial port and one GNSS serial port.
USB interface
Audio channels which include a microphone input and two speakers output
Programmable general purpose input and output
Two SIM card interfaces
SD card interface
I2C interface
ADC interface
Support GNSS function
33tracking/99 acquisition-channel GNSS receiver
12 multi-tone active interference cancellers and jamming elimination
Max fixed update rate up to 10 HZ (1Hz default)
Accuracy 2.5m CEP
SIM868 is designed with power saving technique so that the current consumption is as low as 0.65 mA in sleep
mode (with GNSS part power off).
SIM868 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 [3].
SIMCOM
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