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Original question:

TCA9539-Q1: input state change latch and interrupt output

TPS4H160-Q1: purpose of DIAG_EN

Takuma Ito
Expert 5200 points
Part Number: TPS4H160-Q1

Hello, datasheet says that DIAG_EN is useful when multiple devices are being used and lack of ADC port on MCU, but ADC is needed when B version is used, right? if so when DIAG_EN is useful on A version?

  • 0
    TI__Genius 16075 points

    Hi Takuma, 

    Thanks for reaching out on E2E!

    The general purpose of the DIAG_EN pin is to enable or disable diagnostic functions. The difference between the A and B versions is in how the diagnostics are reported. Those differences are described in section 8.3.5.4 of the datasheet. 

    Best Regards, 

    Elizabeth

  • 0 in reply to Elizabeth Higgins
    TI__Expert 5200 points

    hello Elizabeth,

    THank you for your answer. My point is that for B version there is a merit to disable the diagnostic because it could reduce the MCU's ADC port, but for A version there is no need for ADC because the status output is all digital. I want to know why diagnostic need to be disabled for A version. In which usecases, the diag_EN is useful in A version?

  • 0 in reply to Takuma Ito
    TI__Genius 16075 points

    Takuma,

    The merit to disabling the diagnostic function in version A of the TPS4H160 device is that it lowers your quiescent current, however this disables your fault detection. If you want fault detection, the DIAG_EN must be enabled.

    Best Regards,

    Elizabeth