Data Sheet

Default pinning configuration (modem controlled by AT command)
With AT command modem software, only few pins are configured and used. Other ones
have no specific functions and are not driven by embedded software. These extra pins
must be kept Unconnected.
Default modem software manages UART2 to communicate with application processor or
similar. In this configuration following pins are configured.
UART
The UART configuration for Modem connection is following:
•
Baud Rate : 38400
•
Data : 8 bits
•
Parity : None
•
Stop : 1 bit
•
Flow control : None
•
End line character": LF
Power saving mode
With embedded software using power saving mode, the Wake-up pin must be used to
wake-up the module before any communication through UART. Find below the chronogram
for this wake-up pin use.
Functions class
PAD name
Function
Comment
UART
23
USART2_RX
24
USART2_TX
25
Wake-up
Used in power saving mode to
wake-up the module for UART
communication
12
UART communication
T1
T2
T1": 1ms minimum
T2": 10ms minimum
Wake-up pin