User Guide

ME310G1 Hardware User Guide
1VV0301588 Rev. 4 Page 42 of 77 2020-01-21
NOTE:
According to V.24, some signal names are referred to the application
side, therefore on the ME310G1 side these signal are on the opposite
direction:
TXD on the application side will be connected to the receive line (here
named C103/TXD0)
RXD on the application side will be connected to the transmit line (here
named C104/RXD0)
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 effect it is recommended to avoid
having any HIGH logic level signal applied to the digital pins of the
ME310G1 when the module is powered off or during an ON/OFF
transition (RESET included).
5.6.3.2. Asynchronous Serial Port (USIF1)
The serial port 1 on the ME310G1 is a +1.8V UART with 5 RS232 signals. It differs from the
PC-RS232 in the signal polarity (RS232 is reversed) and levels.
The following table is listing the available signals:
RS232
Pin
Signal
Pad
Name
Usage
2
C104/RXD1
AA11
Transmit line
Output transmit line of
ME310G1 UART
3
C103/TXD1
Y12
Receive line
Input receive of the
ME310G1 UART
Pull-up default during ON
state
5
GND
A3, A7, A9, A13,
A17, B4, B6, B10,
B12, B14, B16,
C19, D18, F8,
F12, F18, G19,
H6, H14, J19,
K18, M18, N19,
P6, P14, T8, T12,
U1, V2, W19, Y2,
Y4
Ground
Ground