SIM808 has 68 SMT pads, which provide all hardware interfaces between the module and customers’ boards.
1. Support 4*4 keypads by default
2. One full modem serial port (UART interface)
3.One USB, which support debug and firmware upgrading.
4. Audio channels which include a microphone input and a receiver output.
5. One SIM card interface.
6. Charginginterface.
7. Programmable general purpose input andoutput(GPIO).
8. Support Bluetooth function.
9. Support GNSS function.
10. Support two PWMs and two ADCs.