This document introduces the SIMCOM SIM300 hardware interface information, including electrical characteristics, packaging size, pin definition, signal level, external circuit, etc.
This document describes the hardware interface of the SIMCOM SIM300 module, covering electrical, mechanical, and functional details needed for integration into mobile applications. It includes pin descriptions, power‑supply information, and mechanical dimensions to aid designers.
Key sections cover power supply ratings, operating modes, serial and audio interfaces, SIM card and LCD connections, GPIO functions, antenna integration, and a complete pin‑out table for the board‑to‑board connector.
The PWRKEY pin is used to restart the SIM300.
The document covers serial, audio, SIM card, LCD, ADC, GPIO, and antenna interfaces.