LE915Ax-P
Hardware Design Guide
1VV0301680 Rev. 2
Page 24 of 51
2021-10-04
Not Subject to NDA
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microcontroller UART @ 5V or other voltages different from 1.8V
Depending on the type of serial port on the OEM hardware, a level translator circuit may
be required to operate the system. On the LE915Ax-P family, the ports are CMOS 1.8V.
Note: When UART signals are used as the communication port
between the host and the modem and flow control is not used,
UART2_CTS line must set to logical LOW. If the UART port is not used,
all UART signals can be left unconnected.
In order to avoid a back powering effect it is recommended to prevent
any HIGH logic level signal from being applied to the digital pins of
the Telit module when the module is powered off or during an
ON/OFF transition.
Figure 5: Typical UART interface with HW flow control
Содержание LE915A P Series
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