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INA3221: pull up voltage value for critical and warning pin , 1.8V ok? & alert time checking

April Jiang
Intellectual 830 points
Part Number: INA3221


Dear colleague,

   My customer concerns on pull up voltage value for critical and warning pin. On DS, Both critical pin and warning pin is pull high to VS, VS is 2.7V to 5V. My customer set VS = 3.3V , but critical pin and warning pin is not pulled high to VS, they set 1.8v to critical pin and warning pin. If it is ok ?  ( 1 question )

The other question is , when our pin detect alert, how's the time ( from detecting alert to action on pin )? 

Thanks.

  • 0
    TI__Mastermind 26335 points
    Hello April,
    Thanks for reaching out on the forum. Setting these digital output pins to 1.8V should not harm the device and as 1.8V is above the VOL max specification, there should be a discernable change when the alert trips.
    As for the response time related to the alert, that corresponds to the conversion time you use. According to section 9.2.3 of the datasheet, the response time will be at least the length of the conversion time and is guaranteed to trigger by two conversion times. The ambiguity can be attributed to the delta sigma integration of the input over time. Over the course of a conversion, if the average measured value is below the limit because the trigger event started mid conversion then the alert may not trigger from that conversion. However, if the over-limit value is sustained for long enough in the following conversion for the average to exceed the limit, the alert will assert then.
  • 0 in reply to Patrick Simmons
    TI__Intellectual 830 points
    Thanks very much, Simmons.