The "SIM800C" module is a GSM/GPRS communication module made by SIMCom. It is a widely used module for IoT (Internet of Things) applications, enabling devices to connect to the cellular network for sending SMS, making calls, and using the internet via GPRS. The module is designed for compact and versatile use in many embedded systems.
Pin Function Specifications:
Here is the detailed explanation of the pin functions and specifications of the SIM800C GSM/GPRS module.
SIM800C Pinout: Pin Number Pin Name Pin Type Function Description 1 VBAT Power Provides the battery voltage (3.4V to 4.4V). 2 GND Ground Ground pin for circuit completion. 3 VDD_EXT Power External power supply input for the module. 4 DSR I/O Data Set Ready, used for communication readiness. 5 DCD I/O Data Carrier Detect, indicates connection status. 6 RI I/O Ring Indicator, used for call alert. 7 CTS I/O Clear To Send, for controlling flow control in UART communication. 8 RTS I/O Request To Send, for controlling flow control in UART communication. 9 RXD I/O Receive Data pin for UART communication. 10 TXD I/O Transmit Data pin for UART communication. 11 RESET I/O Hardware reset for the module. 12 ON/OFF Power Used for turning the module on or off. 13 VDDIO Power Supply voltage for the module's digital logic (1.8V to 3.3V). 14 NC - No connection, unused pin. 15 MIC+ Audio I/O Microphone positive input. 16 MIC- Audio I/O Microphone negative input. 17 SPK+ Audio I/O Speaker positive output. 18 SPK- Audio I/O Speaker negative output. 19 I2C_SCL I/O I2C Clock pin for communication. 20 I2C_SDA I/O I2C Data pin for communication. 21 GPS_RX I/O GPS receiver input, used for GPS data communication. 22 GPS_TX I/O GPS transmitter output, used for GPS data communication. 23 ADC I/O Analog-to-digital converter input, used for analog sensor input. 24 I/O I/O General purpose I/O pin for additional functions. 25 I/O I/O General purpose I/O pin for additional functions. 26 I/O I/O General purpose I/O pin for additional functions. 27 I/O I/O General purpose I/O pin for additional functions. 28 I/O I/O General purpose I/O pin for additional functions. Pin Count and Type:The SIM800C module has a total of 28 pins, with both power and I/O pins serving various functions like UART communication, audio, GPS, and general-purpose I/O.
Pin Function Description:
Each pin serves a specific function necessary for the GSM/GPRS operations of the SIM800C module. The I/O pins are used for communication with external devices, such as sensors or controllers, while power pins ensure the module gets sufficient voltage to operate.
Common FAQ (20 Questions and Answers) What is the voltage requirement for the SIM800C module? The SIM800C requires a voltage between 3.4V and 4.4V. What is the pin number for the ground connection? Pin 2 is the ground (GND) pin. Which pins are used for UART communication? RXD (Pin 9) and TXD (Pin 10) are used for UART communication. How can I reset the SIM800C module? Pin 11 (RESET) is used to reset the module. What is the purpose of the ON/OFF pin? Pin 12 (ON/OFF) is used for turning the module on or off. What is the use of the RI pin? Pin 6 (RI) is the Ring Indicator, used to signal incoming calls. Which pin should be used to send a data signal to the module? Pin 10 (TXD) is the transmit data pin used to send data to the module. What does the DSR pin indicate? Pin 4 (DSR) indicates whether the communication line is ready. Can I use the SIM800C for GPS applications? Yes, Pins 21 (GPSRX) and 22 (GPSTX) are used for GPS data.How do I control flow control in UART communication?
Pins 7 (CTS) and 8 (RTS) are used for hardware flow control in UART.What is the purpose of the ADC pin?
Pin 23 (ADC) is used for reading analog sensor values.Is there a microphone and speaker interface on the SIM800C?
Yes, Pin 15 (MIC+) and Pin 16 (MIC-) are for microphone input, while Pin 17 (SPK+) and Pin 18 (SPK-) are for speaker output.Can I connect external devices using I/O pins?
Yes, Pins 24 to 28 can be used as general-purpose I/O pins.What voltage is required for the VDDIO pin?
Pin 13 (VDDIO) requires a supply voltage between 1.8V and 3.3V.Is the SIM800C compatible with external power sources?
Yes, Pin 3 (VDD_EXT) allows you to connect an external power supply.Can I use the SIM800C module with 5V systems?
No, the module operates at 3.4V to 4.4V and should not be exposed to 5V directly.What is the maximum current the SIM800C can draw?
The SIM800C can draw up to 2A during peak transmission.Can I use the SIM800C for voice calls?
Yes, the SIM800C supports voice calls, using the audio pins for speaker and microphone.How do I send an SMS using the SIM800C?
You can send SMS messages via the UART interface by sending AT commands to the module.What is the purpose of the VDD_EXT pin?
Pin 3 (VDD_EXT) is used to supply an external power source to the module when needed.Conclusion:
The SIM800C GSM/GPRS module is a versatile communication tool for IoT and embedded systems. With 28 pins, it provides comprehensive functionality for power, UART communication, audio input/output, GPS, and more. By understanding the pinout and their specific functions, you can integrate the module into your projects effectively.