User's Manual

5.2 Electrical characteristics
Absolute Maximum Ratings
Rating Min Max
Storage Temperature
-40℃ +85℃
Operating Temperature
-20℃ +70℃
Supply Voltage: VDD 4.5V 5.5V
Other Terminal Voltages VSS-0.3V VDD+0.3V
5.3 Interface specification
Power Supply +5V/ +5.5V
Interface UART
6. Pin definitions
Pin.No Name Type Description
The left side of the module pin
1 RXD I/O Serial input
2 TXD I/O Serial output
3 GND Ground
GND
4 5V Power 5V VCC
The right side of the module pin
1 RST I Reset input
2 NC NC NNC
3 DTR I DDTR input