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SIM900 Module - 4 Frequency
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The SIM900 is an ultra-compact and reliable quad-band GSM/GPRS module in an SMT package. Built around a powerful single-chip processor with an ARM926EJ-S cor...
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The SIM900 is an ultra-compact and reliable quad-band GSM/GPRS module in an SMT package. Built around a powerful single-chip processor with an ARM926EJ-S core, it delivers voice, SMS, data, and fax capabilities in a tiny 24 × 24 × 3 mm form factor weighing just 3.4 g.
Operating across the 850/900/1800/1900 MHz bands, the SIM900 is ideal for M2M applications where space and power efficiency are critical. It supports embedded TCP/UDP, FTP/HTTP, MMS, and multiplexing protocols, and is controlled via standard AT commands.
Key Features
- Quad-Band GSM/GPRS – 850/900/1800/1900 MHz coverage
- Ultra-Compact Size – Just 24 × 24 × 3 mm and 3.4 g
- Low Power Consumption – 1.5 mA in sleep mode
- Wide Supply Voltage – 3.1 V to 4.8 V input range
- Extended Temperature Range – Operates from −40 °C to +85 °C
- AT Command Control – GSM 07.07, 07.05, and SIMCom enhanced AT commands
- SIM Application Toolkit – Supports 3 V and 1.8 V SIM cards
- Embedded Networking – TCP/UDP, FTP, HTTP, and MMS protocols built in
- GPRS Class 10 – Up to 85.6 kbps downlink with coding schemes CS 1–4
- Voice Support – Half rate, full rate, enhanced full rate, and AMR codecs with echo suppression
Interfaces
- Serial Interface – Primary communication with host MCU
- SPI – Optional serial peripheral interface
- I2C, GPIO, PWM, ADC – Flexible peripheral connectivity
- Analog Audio – For voice applications and hands-free operation
- Antenna Pad – External antenna connection
- RTC Backup – Real-time clock with battery backup support
Data & SMS Specifications
- GPRS multi-slot class 10/8, mobile station class B
- CSD up to 14.4 kbps, USSD, non-transparent mode, PPP stack
- PBCCH support
- SMS point-to-point (MO/MT) and cell broadcast
- Text and PDU mode
- Fax Group 3, Class 1
GSM Power Class
- Class 4 – 2 W at 850/900 MHz
- Class 1 – 1 W at 1800/1900 MHz
Certifications
- CE, FCC, ROHS, PTCRB, GCF, IC, ICASA, TA, REACH, AT&T
Ideal For
- IoT and M2M communication projects
- Remote monitoring and telemetry systems
- GPS tracking devices with cellular connectivity
- SMS-based alert and notification systems
- Embedded systems requiring voice or data over GSM
Package Contents
- 1× SIM900 GSM/GPRS Module (SMT)
Jargon buster
Plain-language definitions for the technical terms used above.
- ADC
- An analogue-to-digital converter reads a changing voltage and turns it into a number the microcontroller can use. It matters when connecting analogue sensors such as light, sound, or variable-resistor sensors.
- CS
- CS stands for chip select, a control pin used by SPI devices to tell which connected device should listen. It matters when you connect more than one SPI module to the same microcontroller, because each device usually needs its own CS pin.
- GPIO
- General-purpose input/output pins are microcontroller pins you can set in software to read signals, switch devices on and off, or connect to peripherals. The number of GPIO pins matters because it limits how many buttons, LEDs, sensors, and other parts you can wire directly to the board.
- GPS
- The US satellite navigation system used by GNSS receivers to calculate position and time. Support for GPS is important because it is widely available and often used together with other constellations for more reliable positioning.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- IoT
- Short for Internet of Things, meaning physical devices that connect to networks or the internet to send data or be controlled remotely. It matters if you want projects such as connected sensors, remote controls or classroom data-logging activities.
- PWM
- Pulse Width Modulation is a way for a digital pin to simulate variable output power by switching on and off very quickly. It matters for controlling things like LED brightness, motor speed, or servo-style signals from a microcontroller pin.
- RTC
- A Real-Time Clock keeps track of time even when the main processor is asleep or powered down, usually with a small backup battery. It matters for data logging and tracking projects that need accurate timestamps.
- SPI
- A fast serial communication bus often used for displays, memory cards, and sensors. It matters because SPI devices need specific pins for clock and data, plus a separate chip-select line for each device.
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