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ISO6721-Q1: ISO6721-Q1 OUTB have peak voltage issue

Lawrence He
Genius 3075 points
Part Number: ISO6721-Q1

Hi, Support Team

We use ISO6721-Q1.   INB pin connected to GND, When power on and we find OUTB have peak voltage 2.92V

is normal?  

note: OUTB Pin is floating

Schematic:

SCOPE:

if any suggestion, Please advise me.

Thanks,

Best regards,

Lawrence

  • +1
    TI__Genius 13495 points

    Hi Lawrence,

    Thank you for your question.

    It is important to consider the default state of the device. The ISO6721-Q1 has a default state of HIGH. Since the INB pin is pulled to ground, this is driving the INB state LOW, which is not default state. The ISO6721-Q1 device stays at default state when powering up. once fully powered up, the device will pass the input state which is LOW. Please refer to Section 9.4 in the datasheet for more information in regards to the logic states when VCC is powered up or powered down.

    Regards,
    Aaditya Vittal