SIM800C GSM GPRS Module 5V 3.3V SIM800C GSM GPRS Wireless Module with and TTS STM32 for C51

SIM800C GSM GPRS Module 5V 3.3V SIM800C GSM GPRS Wireless Module with and TTS STM32 for C51 Description

Wide Voltage Compatibility: Supports both 5V and 3.3V logic levels, allowing easy interfacing with popular development boards such as , STM32, and other MCUs.
SIM800C GSM/GPRS Core: Built around the SIM800C module, offering quad-band GSM support for global use (850/900/1800/1900MHz) and GPRS data connectivity for IoT and M2M applications.
TTL Serial Interface: Integrated TTL UART interface for simple connection to microcontrollers; supports standard AT commands for configuration and control.
IPEX Antenna Interface: Comes with an IPEX (U.FL) antenna connector for stable signal reception and transmission; compatible with a variety of external antennas to adapt to different environments.
Function: Supports connectivity (where firmware enabled), allowing short-range wireless communication and data transmission in addition to GSM/GPRS.

Power input: DC5V or received by a lithium battery input VBAT and GND.
Supports MCU level: 5V / 3.3V for TTL logic
(Such as the common 51 and the for is 5v, STM32 is the 3.3v)
Antenna use: IPEX antenna interfaces, you can use the version PCB antenna or antenna IPEX-SMA- peppers
Pin Description:
5V: power supply pin, the only input DC5V, used to power the board.
V_TTL: access control board microcontroller core target voltage of 5V / 3.3V (according to its own microcontroller is much to distinguish kernel v), this pin is used to convert the GSM module board TXD and RXD for the corresponding TTL logic.GND: power supply ground
TXD: send pin serial port module, TTL level (not directly connected to RS232 level)
RXD: receive pin serial port module, TTL level (not directly connected to RS232 level)
DTR: Data Terminal Ready
SPKP: Core Audio output pin
SPKN: Core Audio output pin
MICN: Core Audio input
MICP: Core Audio inp