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ISO1212: Minimum RSENSE requirement

Hong En Chew
Prodigy 170 points
Part Number: ISO1212

Hi,

I'm considering the ISO1212 for use in an isolated voltage sensing application that does not require IEC61131 compliance. Is there a minimum RSENSE requirement (i.e. can I make the RSENSE resistor value arbitrarily large and reduce the ISO1212 input current to an arbitrarily small value)?

Thank you!

Best Regards,

Hong En

  • +1
    TI__Mastermind 49445 points

    Hi Hong,

    Thank you for reaching out to us and showing interest in ISO1212.

    I believe you wanted to know the minimum ISENSE value (thereby maximum RSENSE) that is allowed for the device to operate normal. ISENSE has a minimum and maximum and the values are 2.2mA and 7.3mA, respectively. This corresponds to a maximum and minim value of 562Ω and 200Ω for RSENSE, respectively.

    Let us know if you have any other questions, thanks.


    Regards,
    Koteshwar Rao

  • 0
    Prodigy 170 points

    Hi Koteshwar,

    Yes apologies for the typo I meant minimum ISENSE. Thanks for the reply, that was what I was looking for.

    One clarification - are the 200R and 562R values nominal or min/max across voltage/temperature? Am thinking what resistor tolerance is required.

    Thank you.

    Best regards,

    Hong En

  • +1 in reply to Hong En Chew
    TI__Mastermind 49445 points

    Hi Hong,

    Thanks for the confirmation.
    Regarding the resistor tolerances, variation of resistance beyond these values due to resistor tolerance is allowed. Please do choose resistors with 1% for best results. Thanks.


    Regards,
    Koteshwar Rao