Description
Two power supply interfaces: VCC5, 5V DC above 1A. Control pin all leads. A TTL level, compatible with 3.3V and 5V. The two-antenna interface, the default SMA straight head, connector for IPXmini antenna. One way of speech interface, the way Mike interface. The control interface of each pin description GND – GND SIMR SIM900A RXD, TTL level, cannot be directly connected to the 232 level SIMT SIM900A TXD, TTL level, cannot be directly connected to the 232 level RST – SIM900A reset, active low VCC_MCU when the SIM900A module and 5V TTL level communication, this pin is connected to DC 5V; when the level of communication of SIM900A and 3.3V TTL, this pin is connected to DC 3.3V. VCC5—-DC 5V input. VCC4——DC3.5–4.5 input Onboard Resources: Serial port circuit(with protection) Antenna interface circuit(SMA bend female port) SIM card circuit(flip SIM slot) 4*3.5 fixture hole 4pcs
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