Question about AD5440 Power on reset

Hi All,

I have a question about how to acctivate the power on reset function.

Please refer to the attachment. The OP5A outputs -10V for about 1 sec when the VDD is applied to AD5540.

I don't think that the power on reset function works well. Even if I'm wrong, how I can reduce the -10V.

Regards,

Kazu

AD5440PoweronReset.pdf
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  • 0
    •  Analog Employees 
    on Apr 18, 2018 6:26 AM

    Hi Kazu,

    It is difficult to tell the exact voltage as other factors such as hysteresis are included but it should be around that voltage.

    There should be no problem with that, but please note that when you use pull-ups, it is recommended that the GPIO controller is configured as open-drain.

    Cheers,

    Ivan

Reply
  • 0
    •  Analog Employees 
    on Apr 18, 2018 6:26 AM

    Hi Kazu,

    It is difficult to tell the exact voltage as other factors such as hysteresis are included but it should be around that voltage.

    There should be no problem with that, but please note that when you use pull-ups, it is recommended that the GPIO controller is configured as open-drain.

    Cheers,

    Ivan

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