SIM900A 1800/1900 MHz Wireless Extension Module GSM GPRS BoardSKU: ELC8006
- On board two power supply interface VCC5 5 V VCC4 interface 3.5 power supply. 4.5 V optional power supply of envelope that (default) and control to start
- On board SMA (default) and IPXmini antenna interface SIM900A reserved interface reset?
- The size of the module is 49 * 50, all the new and original device.
- The computer can provide the power supply of the USB debugging module of the computer,
- A large amount of data under the recommended current condition more than 1 A.
- Dozens of waiting MA data can be configured to provide
- Rest, rest of 10 ma of low power. Support 2, 3.4G mobile phone card.
- Serial port circuit: compatible with 3.3 V single-chip microcomputer
- Microcomputer with single chip TTL serial port support3.3 and 5 V.
- The circuit SIM card to increase the SMF05C ESD chip
- Antenna circuit: guarantees a short and straight, to guarantee the strength of the signal.
- PCB screen printing brand: each interface, practical development twice,
- The SIM900 / hardware is completely still in the design when the manual design
- Two power supply interface: VCC5 5 V DC above 1A!
- The power supply of the 5 V computer can be the first USB in the computer.
- Largest DC long data circuit recommended 5V1A.
- VCC4 3.5. 4.5 V Ibid power supply suitable for lithium battery
- Control Pin all cables.
- A TTL level, compatible with 3.3 V and 5 V.
- The interface of two antennas, the straight head SMA predetermined, the connector for the IPXmini antenna.
- A form of speech interface, the way it exchanges the microphone.
- The control interface of each pin Description:
- GND-GNDSIMR SIM900A RXD TTL level
- It can not be directly connected to the 232 levelSIMT SIM900A TXD TTL level
- It can not be connected directly to the 232 levelRST-SIM900A reset
- Active lowVCC_MCU when the SIM900A module and 5V level TTL communication
- This pin is connected to DC 5 V;
- When the communication level of SIM900A and 3.3V TTL ...
- This pin is connected to DC 3.3 V.
- VCC5 ---- DC 5 V input?
- VCC4 ------ DC3.5--4.5 input
- Integrated resources: serial port circuit (with protection)
- Antenna interface circuit (SMA curve female port) SIM card circuit
- (Flip SIM slot) 4 * 3.5 fixture hole 4pcsSIM900A serial port terminal output