وحدة جي أس أم SIM900A GSM GPRS + هوائي
SIM900A V3.8.2 Wireless Extension Module GSM GPRS Board with Antenna Kit
- Onboard two sets of power interface VCC5 5V power supply, VCC4 interface, 4.8-5.2V power supply, optional power supply self-start (default) and control start.
- Onboard SMA (default) and IPXmini antenna interface, SIM900A interface retains reset.
- The size of the module is 49 * 50mm, all new and original equipment.
- The computer can power the early computer debugging USB module, and there is a very large amount of data under the recommended current of more than 1A.
- You can set up dozens of MA data in standby to provide 10MA low power sleep and sleep.
Product description
Specification:
Serial port circuit: Support 3.3V microcontroller.
TTL serial port: Supports 3.3V and 5V microcontrollers.
SIM card circuit: Added SMF05C ESD chip.
Antenna circuit: ensure short and straight, thus ensuring signal strength.
PCB display printing mark: Each interface is easy to develop twice, and the SIM900 / A hardware is completely designed according to the design manual.
Two power interfaces: VCC5, 1A above 5A DC. The computer 5V power supply can use the computer USB early. The DC long data circuit exceeds the recommended 5V1A. VCC4, 4.8-5.2V power supply, same as above, suitable for lithium batteries.
The control interface described by each pin:
GND - GND
VCC_MCU When the SIM900A module communicates with a 5V TTL level, this pin is connected to DC 5V; when SIM900A and 3.3V TTL communication level, this pin is connected to DC 3.3V.
VCC5 -- DC 5V input.
VCC4 -- DC 4.8-5.2 input.
Onboard Resources:
Serial circuit (with protection)
Antenna interface circuit (SMA curved female port)
SIM card circuit (flip SIM slot)
4 * 3.5 fixture holes
SIM900A serial output terminal
Package list:
1 x SIM900A V3.8.2 Kit
1 x Power Cable
1 x Antenna
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