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Original question:

RM48L952: RM48L952_SIL3_ EXT watchdog

RM48L952: How to handle un-used pins of MCU

Ganesh VInayagam
Prodigy 170 points
Part Number: RM48L952

Hi,

How to handle the un used pins of  RM48L952 MCU.

Which good to go whether  Internal Pull Up or Pull Down.

Please suggest.

For ADC pin alone we are Externally connection 10K pull down.

Thanks and Regards,

Ganesh V 

  • 0
    TI__Guru**** 197306 points

    Hi Ganesh,

    The TI's internal pull-up/down cell is current source, not actual resistance. This current source fixes voltage level when the pin is floating. If the pin is left unconnected (floating), either pull-up or pull-down can be used.

    When the pin with internal pull-up cell is tied to HIGH externally, there is no current leakage, but when this pin is tied to LOW, device leakage occurs. When the pin with internal pull-down cell is tied to HIGH externally, system leakage occurs. If there is a pull-up/down resistor is added on a unused pin external, the internal pull type should be selected.