SIM900A 1800/1900 MHz Wireless Extension Module GSM GPRS Board

• 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

Specifications

Resources

Datasheet

Sample Code

Tutorial