Power Supply: Supply voltage: 3.1V ~ 4.2V; Typical supply voltage: 3.8V
UART Interfaces:
· Main port:
§ Three lines on main port interface
§ Used for AT command communication and data transmission
§ Only support 9600bps baud rate
· Debug port:
§ Two lines on debug port interface: DBG_TXD and DBG_RXD
§ Debug port is used for debugging
§ Only support 921600bps baud rate
