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AM4378: Unused WARMRSTn Pin on AM4378

Conor
Guru 13095 points
Part Number: AM4378
Other Parts Discussed in Thread: AMIC120

Tool/software:

Hi TI Support Team,

I would like to confirm the proper handling of the WARMRSTn pin on the AM4378 MPU when it is not used in the design.

Thank you for your assistance.

Best regards,

Conor

  • 0
    TI__Guru**** 205640 points

    Hello Conor,

    Thank you for the query

    Refer below section of the checklist 

    https://www.ti.com/lit/an/sprace0a/sprace0a.pdf

    2.2.4 Warm Reset

    • The WARMRSTn pin (nRESETIN_OUT signal) is an open-drain signal and requires an external pullup.

    • If you are using nRESETIN_OUT as a bi-directional reset signal with a push-button, you may need a debounce circuit. Sometimes this is omitted in cases where the button is strictly for development purposes.

    • nRESETIN_OUT is undefined during supply ramp. If your external devices require reset to be actively driven low during the entire power-up/down sequence, you can implement a circuit as shown in the External Buffer for nRESETIN_OUT figure in the AM437x and AMIC120 ARM® CortexTm-A9 processors technical reference manual.

    Regards,

    Sreenivasa