ST EVALCOMMBOARD Manual page 21

UM0240
Setting:
●
Open = for ICC use
● Closed = for LEDs use
Jumper J11 disconnects the RS-232 level shifter from the power supply.
This reduces power consumption if the RS-232 interface is not used and frees MCU pins for
another use. (Level shifter pins output are in Tri-state mode when device is off.)
Setting:
●
Open = RS-232 off
●
Closed = RS-232 on
Interfaces and connectors
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