This is the hardware design manual of SIM900A module provided by SIMCom. It mainly introduces the features, application interfaces, antenna interfaces, electrical, reliability and RF characteristics, and mechanical dimensions of the module.
This manual provides detailed hardware design information for the SIM900A_HD module from SimCom. It includes the module’s architecture, pin assignments, power supply considerations, sleep modes, reset circuitry and external component recommendations.
The document is organized into sections covering an overview of the module, pin configuration tables, power management guidelines, sleep and low‑power modes, reset circuit design, RS232 interface details, and a list of recommended external components and their specifications. This manual is written in Chinese.
The manual is version V1.01 dated 22.02.2010.
It covers the SIM900A_HD GSM module.
Support phone numbers are +86 21 3235 3300 and +86 21 3235 3301; the website is www.sim.com/wm.