SIM900A Dual Band GSM/GPRS Module

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SIM900A GSM module delivers GSM/GPRS 900/1800MHz performance for voice, SMS, Data, and Fax in a small form factor and with low power consumption. With a tiny configuration of 24mm x 24mm x 3 mm, SIM900A can fit almost all the space requirements in your applications, especially for the slim and compact demands of design

The SIM900A is integrated with the TCP/IP protocol; extended TCP/IP AT commands are developed to use the TCP/IP protocol easily, which is very useful for data transfer applications. It can communicate with controllers via AT commands (GSM 07.07,07.05, and SIMCOM enhanced AT Commands).

SIM900A-Dual-Band-GSM-GPRS-Module

SIM900A Key Features

  • Typical power consumption in SLEEP mode is 1.5mA (BS-PA-MFRMS=5)
  • SIM900A Dual-band: EGSM900, DCS1800. The SIM900A can search the 2 frequency bands automatically. The frequency bands also can be set by AT command.
  • Compliant to GSM Phase 2/2+
  • Class 4 (2W) at EGSM 900
  • Class 1 (1W) at DCS 1800
  • GPRS multi-slot class 10 (default)
  • GPRS multi-slot class 8 (option)
  • GPRS mobile station class B

SIM900A Pinout

SIM900A-GSM-GPRS-Pinout
Pin NamePin No.Description
Vcc1Module Supply Power Pin (5V)
GND2Ground Pin
5V TXD3Transmit Data pin 5V
5V RXD4Receive Data Pin 5V
3.3V TXD5Transmit Data pin 3.3V
3.3V RXD6Receive Data Pin 3.3V
SIM900A-Pinout
Pin NamePin No.Description
PWRKEY1Voltage input for PWRKEY.  PWRKEY should be pulled low to power on or power off the system.
The user should keep pressing the key for a short time when power on or power off the system because the system need margin time in order to assert the software
PWRKEY_OUT2Connecting PWRKEY and PWRKEY_OUT for a short time then release also can power on or power off the module
DTR3Data terminal Ready  [Serial port ]
RI4Ring indicator  [Serial port ]
DCD5Data carry detect  [Serial port ]
DSR6Data Set Ready  [Serial port ]
CTS7Clear to send [Serial port ]
RTS8Request to send [Serial port ]
TXD9Transmit data [Serial port ]
RXD10Receive data [Serial port ]
DISP _CLK11Clock for display [Display interface]
DISP_DATA12Display data output [Display interface]
DISP _D/C13Display data or command select [Display interface]
DISP _CS14Display Enable [Display interface]
VDD_EXT152.8V output power supply
NRESET16External reset input
GND17,18,29,39,45,
46,53,54,58,59,
61,62,63,64,65
Ground Pin
MIC_P19Microphone Positive
MIC_N20Microphone Negative
SPK_P21Speaker Positive
SPK_N22Speaker Negative
LINEIN_R23Right Channel input [External line inputs are available to directly mix or multiplex externally generated analog signals such as polyphonic tones from an external melody IC or music generated by an FM tuner IC or module.
LINEIN_L24Left Channel Input
ADC25General purpose analog to digital converter.
VRTC26Current input for RTC when the battery is not supplied for the system.
Current output for backup battery when the main battery is present and the backup battery is in low voltage state
DBG_TXD27Transmit pin [Serial interface for debugging and firmware upgrade ]
DBG_RXD28Receive pin [Serial interface for debugging and firmware upgrade ]
SIM_VDD30Voltage supply for SIM card
SIM_DATA31SIM data output
SIM_CLK32SIM clock
SIM_RST33SIM reset
SIM_PRESENCE34SIM detect
PWM135PWM Output
PWM236PWM Output
SDA37Serial Data [I2C]
SCL38Serial Clock [I2C]
KBR0 to KBR4
&
KBC4 to KBC0
40,41,42,43,44
&
47,48,49,50,51
Keypad interface  [ROWS & COLUMNS]
NETLIGHT52Indicate net status
VBAT55,56,57Three VBAT pins are dedicated to connect the supply voltage. The power supply of SIM900A has to be a single voltage source of VBAT= 3.4V to 4.5V. It must be able to provide sufficient current in a transmit burst which typically rises to 2A.
RF_ANT60Antenna connection
STATUS66Indicate working status
GPIO 1167General Purpose Input/output
GPIO 1268General Purpose Input/output

Specifications

  • Single supply voltage: 3.4V – 4.5V
  • Power saving mode: Typical power consumption in SLEEP mode is 1.5mA
  • Frequency bands: SIM900A Dual-band: EGSM900, DCS1800. The SIM900A can search the two frequency bands automatically. The frequency bands also can be set by AT command.
  • GSM class: Small MS
  • GPRS connectivity:GPRS multi-slot class 10 (default) , GPRS multi-slot class 8 (option)
  • Transmitting power: Class 4 (2W) at EGSM 900, Class 1 (1W) at DCS 1800
  • Operating Temperature: -30ºC to +80ºC
  • Storage Temperature: -5ºC to +90ºC
  • DATA GPRS: download transfer max is 85.6KBps, Upload transfer max 42.8KBps
  • Supports CSD, USSD, SMS, FAX
  • Supports MIC and Audio Input
  • Speaker Input
  • Features keypad interface
  • Features display interface
  • Features Real Time Clock
  • Supports UART interface
  • Supports single SIM card          
  • Firmware upgrade by debug port
  • Communication by using AT commands

Applications

  • Mobile Sets
  • PDAs

SIM900A Datasheet

You can download the datasheet for the SIM900A Dual Band GSM/GPRS Module by clicking the link given below:

See Also: CD4059 Program Divide-by-N Counter | GY-NEO6MV2 Flight Control GPS Module | MPU6050 Gyrometer And Accelerometer Module