QXKE SIM900A V4.1 Wireless Expansion Module GPRS/GSM 900/1800 MHz Dual Band+ Antenna

feature: There are two onboard power supply interfaces VCC5 5V power supply VCC4 interface 3.5--4.5V power supply optional power-on self-start (default) and control start. On-board SMA (default) and IPXmini antenna interface SIM900A interface is reserved for reset. The module size is 49*50 all of which are brand new and original. The computer can supply power to the early computer to debug the USB module. When the recommended current is above 1A the amount of data is very large. Dozens of MA data in standby can be set to provide sleep 10MA low-power sleep. Support 2 mobile phone 3 4G card. Serial port circuit: support 3.3V microcontroller. TTL serial port support 3.3 and 5V microcontrollers. SIM card circuit adds SMF05C ESD chip. Antenna circuit: keep it short and straight to ensure signal strength. PCB display silk screen mark: each interface is convenient for secondary development SIM900/A hardware is completely designed according to the design manual. Two power supply interfaces: VCC5 5V DC above 1A. Computer 5V power supply can be used in early computer USB. If the DC long data circuit is too large 5V1A is recommended. VCC4 3.5--4.5V power supply same as above suitable for lithium battery. Control pins for all leads. A TTL level compatible with 3.3V and 5V. Two antenna ports default SMA straight head IPXmini antenna connector. A voice interface method a microphone interface method. Description of each pin control interface: ground - ground SIMR SIM900A RXD TTL level not directly connected to 232 level SIMT SIM900A TXD TTL level not directly connected to 232 level RST - SIM900A reset active low VCC_MCU When SIM900A module communicates with 5V TTL level this pin is connected to DC 5V; when SIM900A communicates with 3.3V TTL level 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 curved female port) SIM card circuit (flip the SIM card slot) 4*3.5 Fixture hole 4pcs SIM900A serial port output terminal Specification: Color as shown Dimensions: 49mm x 47mm Net weight: 28g Weight: 38g Package Included: 1 x SIM900A Kit 1 x Power Cord 1 x Antenna notes: 1. Due to manual measurement please allow 1-3mm error. 2. Due to the difference of different monitors the picture may not reflect the actual color of the item. Thanks!