SIM 900A GSM/GPRS Module with Antenna

• 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