original gsm module sim900a SIM900 MINI V4.0 Wireless Data Transmission GPRS Board Kit / Antenna C83
Properties:
The onboard two set power supply interface VCC5 5V power supply, VCC4 interface, 3.5-4.5V power adapter, optional power on auto start (standard) and control start.
The onboard SMA (standard) and IPXmini antenna interface, SIM900A interface reserved reset.
The size of the module is 49 * 50, all the new and original device.
The computer can give early computer debugging USB module power supply, a very large amount of data under the condition of the recommended power more than 1A. Standby dozens of MA data can be set to provide peace and quiet of 10MA low-power. Support 2, mobile phone 3.4G card.
The serial port: support for 3.3V single-chip microcomputer. TTL serial port support
3.3 and 5V single-chip microcomputer.
The SIM card circuit increase the SMF05C ESD chip.
Antenna circuit: guarantee short and straight, as well as to ensure the signal strength.
PCB display screen printing mark: every interface, convenient development two times, the SIM900 / ONE hardware is completely follow the design, if the design manual.
Two power supply interface: VCC5, 5V DC via 1A. Computer 5V power adapter can be early computer USB. DC long data circuit over larger recommended 5V1A. VCC4, 3.5-4.5V power supply, ibid, suitable for lithium battery.
Control pin all leads.
ONE tl level, compatible with 3.3V and 5V.
The two antenna interface, the standard SMA straight head, plug for IPXmini antenna.
One way of talking interface, the off Mike interface.
The control interface of each pin description:
GND GND
SIMR SIM900A RXD, TTL level, can not be directly connected to the 232 level
SIMT SIM900A TXD, TTL level, can not be directly connected to the 232 level
RST-SIM900A reset, active low
VCC_MCU if the SIM900A module and 5V TTL level communication, this pin is connected to DC 5V; When the level of communication from 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 (with protection)
Antenna interface circuit (SMA bend female port)
SIM card circuit (flip SIM slot)
4 * 3.5 light hole 4 pieces
SIM900A serial port output terminal
specifications:
Size: 49mm x 47mm
Net weight: 28g
Weight: 38g
Package Included:
1 x SIM900A V4.0 kit
1x power cable
1x antenna
