User Guide

ME910G1 HW Design Guide
1VV0301593 Rev.7 Page 50 of 98 2021-02-02
Note: According to V.24, some signal names are referred to the
application side, therefore on the ME910G1 side these signal are on
the opposite direction: TXD on the application side will be connected
to the receive line (here named C103/TXD)
RXD on the application side will be connected to the transmit line
(here named C104/RXD).
For a minimum implementation, only the TXD, RXD lines can be
connected, the other lines can be left open provided a software flow
control is implemented.
In order to avoid a back powering it is recommended to prevent any
HIGH logic level signal from being applied to the digital pins of the
ME910G1 when the module is powered off or during an ON/OFF
transition.
Modem serial port 2 (USIF1)
The auxiliary serial port on the ME910G1 is a CMOS1.8V with only the RX and TX signals.
The signals of the ME910G1 serial port are:
PAD
Signal
I/O
Function
Type
NOTE
D15
TX_AUX
O
Auxiliary UART (TX Data to DTE)
CMOS 1.8V
Shared with
SPI_MOSI
E15
RX_AUX
I
Auxiliary UART (RX Data from DTE)
CMOS 1.8V
Shared with
SPI_MISO
Table 22: ME910G1 serial port signals
Note: Due to the shared functions, TX_AUX/RX_AUX port and SPI port
cannot be used simultanously.
In order to avoid a back powering it is recommended to prevent any
HIGH logic level signal from being applied to the digital pins of the
ME910G1 when the module is powered off or during an ON/OFF
transition.
Refer to ME910G1 series AT command reference guide for port
configuration.