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AM6442: Query on AM6442 VMON_VSYS Functionality

Arunkumar S
Prodigy 50 points

Part Number: AM6442

We are using the AM6442BSFGHAALV processor for a new design.

Could you please clarify whether VMON_VSYS is intended for undervoltage detection, overvoltage detection, or both for pre regulator supply.

Additionally, the datasheet recommends placing a filter capacitor across pull down resistor in 8.2.4 System Power Supply Monitor Design Guidelines section. Could you suggest an appropriate capacitor value for the same.

 

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Regards,

Arunkumar S

  • 0
    TI__Mastermind 25070 points

    Hi Arunkumar,

    Arunkumar S said:
    Could you please clarify whether VMON_VSYS is intended for undervoltage detection, overvoltage detection, or both for pre regulator supply.

    It detects only undervoltage events, see row #1:

    Arunkumar S said:
    datasheet recommends placing a filter capacitor across pull down resistor in 8.2.4 System Power Supply Monitor Design Guidelines section. Could you suggest an appropriate capacitor value for the same.

    It really depends on the system design and how much noise the pin will be picking up. I guess several nanofarads is a good starting point then adjust as necessary. Too much capacitance would delay a real event, thus this also depends on your requirements.

    Regards,

    Stan