Product description
SIM900A Module Call Short Message GSM/GPRS Wireless Data Transmission
Module interfaces and module configuration are as follows
On board a tantalum capacitor, pure copper antenna, auto power on circuit, power to change the card circuit, microphone headphone input and output, sleep circuit, reset circuit.
The module power supply range of 3.7V ~ 4.8V, you can use lithium batteries to power the module, but remember, do not be greater than 4.8V, or it will burn out!!!!
This module for the TTL level interface, can be directly connected to the microcontroller, ARM, without conversion devices, and computer links need to be USB to TTL module to communicate, do not link with RS232, RS485 and other serial ports, will burn the module!
Shutdown current: 4mA (reset pin connected to GND)
Operating current: 50mA (average)
Standby current:20mA(jump 0~20ma)
Peak emission current:2a(during registration)