what should be the connection of unused supply monitoring pin of STM6905(Quintuple, ultralow voltage supervisor) Monitoring IC, It is mentioned that the pin is having high impedance.

[AMart.24]

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[Peter BENSCH]

Welcome, @AMart.24​, to the community!

Please connect unused supply monitoring pins (V2IN/V3IN/V4IN/V5IN) of the STM6905 to VCC, otherwise they may pick up noise from the environment and generate a reset at the /RST output.

Does it answer your question?

Regards

/Peter

[AMart.24]

Many thanks Peter for your reply,

Should we use a pull up, or connect it directly to supply, for unused pins?

[Peter BENSCH]

Any of the unused supply monitoring pins (V2IN/V3IN/V4IN/V5IN) of the STM6905 can be connected to VCC, either directly or via a pull-up.

If the problem is resolved, please mark this topic as answered by selecting Select as best. This will help other users find that answer faster.

/Peter