NL865B1 HW Design Guide
1VV0301450 Rev. 1
Page
43
of
72
2017-11-20
NOTE
:
The digital input lines operating at 1.8V CMOS have an absolute
maximum input voltage of 2.2V. The level translator IC outputs on the
module side (i.e. module inputs) will cause damage to the module
inputs if the level translator is powered by a +3.8V supply. So the
level translator IC must be powered from a ded1.8V power
supply to match the module I/O level.
The RS232 serial port lines are usually connected to a DB9 connector with the following
layout:
