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Sim900A Gsm Modem Module

SKU: W006

The SIM900A is a readily available GSM/GPRS module,used in many mobile phones and PDA. The module can also be used for developing IOT (Internet of Things) and Embedded Applications. SIM900A is a dual-band GSM/GPRS engine that works on frequencies EGSM 900MHz and DCS 1800MHz. SIM900A features GPRS multi-slot class 10/ class 8 (optional) and supports the GPRS coding schemes CS-1, CS-2, CS-3 and CS-4.

  • PIN CONFIGURATION

    Pin NO

    Pin 

     

    NO

                                          Description

    1

    PWRKEY

    Voltage 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.

    2

    PWRKEY_OUT

    Connecting PWRKEY and PWRKEY_OUT for a short time then release also can power on or power off the module.

    3

    DTR

    Data terminal Ready  [Serial port ]

    4

    RI

    Ring indicator  [Serial port ]

    5

    DCD

    Data carry detect  [Serial port ]

    6

    DSR

    Data Set Ready  [Serial port ]

    7

    CTS

    Clear to send [Serial port ]

    8

    RTS

    Request to send [Serial port ]

    9

    TXD

    Transmit data [Serial port ]

    10

    RXD

    Receive data [Serial port ]

    11

    DISP _CLK

    Clock for display [Display interface]

    12

    DISP_DATA

    Display data output [Display interface]

    13

    DISP _D/C

    Display data or command select [Display interface]

    14

    DISP _CS

    Display Enable [Display interface]

    15

    VDD_EXT

    2.8V output power supply

    16

    NRESET

    External reset input

    17,18,29,39,45,

    46,53,54,58,59,

    61,62,63,64,65

    GND

    Ground

    19

    MIC_P

    Microphone Positive

    20

    MIC_N

    Microphone Negative

    21

    SPK_P

    Speaker Positive

    22

    SPK_N

    Speaker Negative

    23

    LINEIN_R

    Right 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.]

    24

    LINEIN_L

     

    Left Channel Input

    25

    ADC

    General purpose analog to digital converter.

    26

    VRTC

    Current 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.

    27

    DBG_TXD

    Transmit pin [Serial interface for debugging and firmware upgrade ]

    28

    DBG_RXD

    Receive pin [Serial interface for debugging and firmware upgrade ]

    30

    SIM_VDD

    Voltage supply for SIM card

    31

    SIM_DATA

    SIM data output

    32

    SIM_CLK

    SIM clock

    33

    SIM_RST

    SIM reset

    34

    SIM_PRESENCE

    SIM detect

    35

    PWM1

    PWM Output

    36

    PWM2

    PWM Output

    37

    SDA

    Serial Data [I2C]

    38

    SCL

    Serial Clock [I2C]

    40,41,42,43,44

    &

    47,48,49,50,51

    KBR0 to KBR4

    &

    KBC4 to KBC0

    Keypad interface  [ROWS & COLUMNS]

    52

    NETLIGHT

    Indicate net status

    55,56,57

    VBAT

    Three 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.

    60

    RF_ANT

    Antenna connection

    66

    STATUS

    Indicate working status

    67

    GPIO 11

    General Purpose Input/output

    68

    GPIO 12

    General Purpose Input/output

     

  • FEATURES

    • 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
  • How to Use SIM900A Module

    the communication with this module is done through UART or RS232 Interface. The data is sent to the module or received from the module though UART interface.

    The module is typically connected to +4.0V standard power supply. It can work on +4.5V regulated power and any higher voltage may damage the module. And the power source should be able to deliver a peak current of 2A. The UART interface is established as shown in figure. All you need to do is connect RXD of module to TXD of Arduino and TXD is connected to RXD of ARDUINO. The ground of controller and module must be connected for voltage reference. Here AUDIO IN is connected to MIC and AUDIO OUT is connected to a speaker or headset. And at last we need to connect a working GSM SIM card to the module. On powering the module the NETLIGHT LED will blink periodically to state successful connection.

    After all connections are done,we need to write a program for the microcontroller to exchange data with module. Since data exchange sequence between controller and module is really complex we will use libraries prewritten for the module. You can download libraries for controller or module through their websites. Using these libraries makes the communication easy. All you need to do is download these libraries and call them in programs. Once the header file is included, you can use simple commands in the program to tell the controller to send or receive data. The controller sendsthe data to the module through UART Interface based on protocol setup in libraries. The module sends this data to another GSM user using cellular network. If the module receives any data from the cellular network (or another GSM user) it will transmit it to controller through UART serial communication.

  • Applications

    • Cellular Communication
    • Robotics
    • Mobile Phone Accessories
    • Servers
    • Computer Peripherals
    • Automobile
    • USB Dongles
₹999.00Price