• SIM900A adopts industrial standard interface and its working frequency is GSM/GPRS 850/900/1800/1900MHz. It can transmit voice, SMS, data and fax information with low power consumption.
• In addition, the size of SIM900A is 24 x 24 x 3 mm, which can be applied to all kinds of design requirements in M2M applications, especially for compact product design.
Main characteristics
• Dual frequency 900/1800 MHz
• GPRS multi-slot class 10/8
• GPRS mobile station class B
• Satisfying GSM 2/2+Standard
Class 4 (2W@900MHz)
Class 1 (1W @ 1800MHz)
• Size: 24*24*3mm
• Weight: 3.4g
• Control by AT command (GSM 07.07, 07.05 and SIMCOM Enhanced AT Command Set)
• SIM Application Toolkit
• Supply Voltage Range: 3.1... 4.8V
• Low power consumption: 1.5mA (sleep mode)
• Operating temperature range: - 40 C to + 85 C
Fax
• Group 3, class 1
Data transmission
• GPRS class 10: maximum 85.6 kbps (downlink rate)
• Support PBCCH
• Coding schemes CS 1, 2, 3, 4
• CSD reached 14.4 kbps
• USSD
• Non-transmissible
• PPP-stack
Short message
• Point-to-point MO and MT
• Short Message Broadcasting
• Text and PDU modes
Software features
• 0710 MUX Protocol
• Embedded TCP/UDP Protocol
• FTP/HTTP (achievable in July 2010)
Enhanced version software features
• FOTA (achievable in July 2010)
• MMS (achievable in July 2010)
• Embedded AT (achievable in the third quarter of 2010)
Voice
• Tricodec
Half-rate (HR)
- Full Rate (FR)
Enhanced Full Rate (EFR)
• Supporting Echo Suppression Algorithms
• AMR
Half-rate (HR)
- Full Rate (FR)
Interface
• Supporting SIM card 3V/1.8V interface
• Analog Audio Interface
• Support RTC
• SPI interface
• Serial interface
• Antenna pad
• I2C
• GPIO
• PWM
• ADC
Compatibility
• AT cellular command interface
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