•The keypad and SPI display interface will give you the flexibility to develop customized applications. •Serial port and Debug port can help you easily develop your applications. •One audio channel includes a microphone input and a speaker output. The SIM900 is designed with power saving technique so that the current consumption is as low as 1.5mA in SLEEP mode. The SIM900 is integrated with the TCP/IP protocol; extended TCP/IP AT commands are developed for customers to use the TCP/IP protocol easily, which is very useful for those data transfer applications. 7.Temperature range:     •Normal operation: -30°C to +80°C     •Restricted operation: -40°C to -30°C and +80 °C to +85°C     •Storage temperature -45°C to +90°C 11.FAX: Group 3 Class 1 12.SIM interface: Support SIM card: 1.8V, 3V 13.External antenna: Antenna pad 14.Audio features: Speech codec modes:     •Half Rate (ETS 06.20)     •Full Rate (ETS 06.10)     •Enhanced Full Rate (ETS 06.50 / 06.60 / 06.80)     •Adaptive multi rate (AMR)     •Echo Cancellation     •Noise Suppression 15.Serial port and Debug port: Serial Port:     •8-wire modem interface with status and control lines, unbalanced,asynchronous.     •1.2kbps to 11.52kbps.     •Serial Port can be used for AT commands or data stream.     •Supports RTS/CTS hardware handshake and software ON/OFF flow control.     •Multiplex ability according to GSM 07.10 Multiplexer Protocol.     •Autobauding supports baud rate from 1200 bps to 115200bps.   Debug port:     •2-wire null modem interface DBG_TXD and DBG_RXD.     •Can be used for debugging and upgrading firmware. 16.Phonebook management: Support phonebook types: SM, FD, LD, RC, ON, MC. 17.SIM Application Toolkit: Support SAT class 3, GSM 11.14 Release 99 18.Real time clock: Implemented 19.Timer function: Programmable via AT command 20.Physical characteristics: Size: 24mm x 24mm x 3mm Weight: 3.4g 21.Firmware upgrade: Firmware upgrade by debug port Downloads  SIM900 AT Commands Set PDF Download >> SIM900 Hardware Design PDF Download >> SIM900 Certificate PDF Download >> SIM900 EVB User Guide PDF Download >> 

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