DESCRIPTION
Power input: DC5V or received by a lithium battery input VBAT and GND.Supports MCU level: 5V / 3.3V for TTL logic (Such as the common 51 and the for af ‘s the 3.3v) Antenna use: IPEX antenna interfz rsion PCB antenna or antenna IPEX-SMA-
PIN DESCRIPTION
5V: power supply pin, the only inj 3 r the board
V_TTL: access control board microcontrolls re target voltage of 5V / 3.3V (according to
its own microcontroller is I ) gt i d to convert the GSM
module board TXD and R_XD fo!e wrresponaTL IognEND power supply
ground We Are The Distributor @§TZT Brat Hong Kong€hina.
TXD: send pin serial port modul@* TTL ley ly corected to RS232 level)
RXD: receive pin serial port module, TTL level (not directly connected to RS232 level)
DTR: Data Terminal Ready
SPKP: Core Audio output pin
SPKN: Core Audio output pin
MICN: Core Audio input
MICP: Core Audio input
RI: Ring core pin tips
VRTC: RTC pin external battery
GND: power supply ground
PWR: This pin can turn down or turn off the module
GND: power supply ground
VBAT: lithium battery input pin, 3.3v; –
