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Original question:

TCA9617A: Buffered low feature, preventing the lockup condition

TCA9617A: TCA9617A

FARMAN ULLAH
Prodigy 140 points
Part Number: TCA9617A


Hi Team,

From the TCA9617A/B datasheet, Vcca must be equal or lower than Vccb. What possible errors could be seen if this condition is not met? 

Vcca is only used to provide references for the A-side input comparators and the power-good detect circuit. In this case, the only issue I can think is, the reference voltages would change if Vcca is higher than Vccb, since the references are 0.3*vcca and 0.7*vccb, which will eventually let the comparators to decide based on new references. 

what other errors can possibly be observed? 

Thanks

  • 0
    TI__Genius 15345 points

    Hi Farman,

    You can technically operate this device with VCCA>VCCB. However this would shift around the electrical characteristics of this device. The TCA9617 was only electrically characterized with VCCA<=VCCB so we wouldn't know what this change would do to the device. You would have to test it.

    One thing to check would be the VILC of the B side. This change could shift the VILC and you need to make sure that your I2C driver is able to drive below the VILC. If this is not possible then you would not be able to send a low from B side to A side.

    Let me know if you have any further questions.

    Best,

    Chris