SIM 900 GSM/GPRS Module – An Overview

The SIM900 is a complete Quad-band GSM/GPRS solution in a SMT module which can be embedded in the customer applications. Featuring  an  industry-standard  interface,  the  SIM900  delivers GSM/GPRS 850/900/1800/1900MHz performance for voice, SMS, Data,  and  Fax  in  a  small   form  factor  and  with  low  power consumption. SIM900 can fit almost all the space requirements in your M2M application, especially for slim and compact demand of design.This is a GSM/GPRS-compatible Quad-band cell phone,  which can be used not only to access the Internet, but also for oral communication (provided that it is connected to a microphone and a small loud speaker) and for SMSs. Externally, it looks like a big package (0.94 inches x 0.94 inches x 0.12 inches) with L-shaped contacts on four sides so that they can be soldered both on the side and at the bottom. Internally, the module is managed by an AMR926EJ-S processor, which controls phone communication, data communication (through an integrated TCP/IP stack), and (through an UART and a TTL serial interface) the communication with the circuit interfaced with the cell phone itself.


The processor is also in charge of a SIM card (3 or 1.8 V) which needs to be attached to the outer wall of the module.In addition, the GSM900 device integrates an analog interface, A/D converter,  RTC, SPI bus, I²C, and a PWM module. The radio section is GSM phase 2/2+ compatible and is either class   4 (2 W) at 850/ 900 MHz or class 1 (1 W) at 1800/1900 MHz.

The TTL serial interface is in charge not only of communicating all the data relative to the SMS already received and those that come in during TCP/IP sessions in GPRS (the data-rate is determined by GPRS class 10: max. 85,6 kbps), but also of receiving the circuit commands (in our case, coming from the PIC governing the remote control) that can be either AT standard or AT-enhanced SIMCom type. The module is supplied with continuous energy (between 3.4 and 4.5 V) and absorbs a maximum of 0.8A during transmission.

Note:SIM900 is supported worldwide.GSM-900 Bands and GSM-1800 Bands are used in most parts of the world: Europe, Middle East, Africa,Australia, Oceania (and most of Asia).GSM-850 Bands and GSM-1900 Bands are used in Canada, the United States and many other countries in the Americas.

Pin Out:

Features:

  • SIM900  is  designed  with  a  very  powerful  single-chip  processor  integrating AMR926EJ-S core
  • Quad – band GSM/GPRS module with a size of 24mmx24mmx3mm
  • SMT type suit for customer application
  • An embedded Powerful TCP/IP protocol stack
  • Based upon mature and field-proven platform, backed up by our support service, from definition to design and production

Specifications:

  • Quad-Band 850/ 900/ 1800/ 1900 MHz
  • GPRS multi-slot class 10/8
  • GPRS mobile station class B
  • Compliant to GSM phase 2/2+  
    • Class 4 (2 W @850/ 900 MHz)
    • Class 1 (1 W @ 1800/1900MHz)
  • Dimensions: 24* 24 * 3 mm
  • Weight: 3.4g
  • Control via AT commands (GSM 07.07 ,07.05 and SIMCOM enhanced AT Commands)
  • SIM application toolkit
  • Supply voltage range 3.4 – 4.5 V
  • Low power consumption
  • Operation temperature: -30 °C to +80 °C

Specifications for fax:

  • Group 3, class 1

Specifications for data:

  • GPRS class 10: max. 85.6 kbps(downlink)
  • PBCCH support
  • Coding schemes CS 1, 2, 3, 4
  • CSD up to 14.4 kbps
  • USSD
  • Non transparent mode
  • PPP-stack

Specifications for SMS via GSM/ GPRS:

  • Point-to-point MO and MT
  • SMS cell broadcast
  • Text and PDU mode

Drivers:

  • MUX Driver

Specifications for voice:

  • Tricodec
    • Half rate (HR)
    • Full rate (FR)
    • Enhanced Full rate (EFR)
  • Hands-free operation
    • Echo suppression  
  • AMR
    • Half Rate(HR)
    • Full Rate(FR)

Interfaces:

  • Interface to external SIM 3V/ 1.8V
  • analog audio interface
  • RTC backup
  • SPI interface
  • Serial interface
  • Antenna pad
  • I2C
  • GPIO
  • PWM
  • ADC

Compatibility:

AT cellular command interface

Approvals (In planning):

  • CE
  • FCC
  • ROHS
  • PTCRB
  • GCF
  • AT&T
  • IC
  • TA

Resources:


How to buy:

Click here to buy SIM 900 – GSM/GPRS Module.
Click here to buy GSM/GPRS TTL UART MODEM-SIM900
Click here to buy GSM/GPRS RS232 MODEM-SIM900
Click here to buy GSM/GPRS MODEM- SIM900 -RS232 (RMC)


Support:

Please share your ideas with us, visit our forum for discussion.

Frequently Asked Questions(FAQ):Q:What GSM frequency bands are supported by SIM900 module?
Ans:SIM900 is Quad-Band module and it supports 850/ 900/ 1800/ 1900 MHz frequencies.

Q:How to upgrade Firmware in SIM900 module?
Ans:Firmware upgrade: Firmware is upgraded through debug port.

Q:How much voltage is supplied to module for proper working?
Ans:Supply voltage should be in between 3.4V – 4.5V to the module.

 

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