Telit Wireless Solutions ME910G1, Руководство по конструкции

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ME910G1 Hardware Design Guide
1VV0301593 Rev.12
Page 47 of 93 2021-09-24
Not Subject to NDA
Note: According to V.24, some signal names refer to the application
side, so on the ME910G1 side these signal are in the opposite
direction:
TXD on the application side is connected to the receiving line (here
named C103/TXD)
RXD on the application side will be connected to the transmit line
(here named C104/RXD).
For reduced implementation, only the TXD, RXD lines can be
connected, the other lines can be left open.
To avoid a back powering it is recommended to prevent any HIGH
logic level signals 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 23: 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.