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TPS1H200A-Q1: TPS1H200 Diagnostic

Alan Xia
Genius 9670 points
Part Number: TPS1H200A-Q1

Hi team，

My customer are using TPS1H200 HSD in our project, I have some question regarding the diagnostic.

From below table, after DIAG_EN pin is enabled,

Pin IN, we can control by our IOC;

Fault Pin: we can read out by our IOC;

 

For the OUT signal, does it mean we have to connect to one ADC of IOC, then it can support “FULL DAIGNOSTIC”?

 

(Full diagnostic means IOC can distinguish Normal/OPEN load/Short to Battery/Short to Ground state)

 

  • 0
    TI__Mastermind 32650 points

    Hi Alan,

    I am not sure if I fully understand the question but the customer does not need to connect the output pin of the device to the adc or the controller.

    I,ol,on is an internal threshold for open load detection in the on state.

    DIAG_EN must be pulled high and the device must be powered (in the recommended operating voltage range) for full diagnostics.

    You can also look at the EVM for a schematic reference. You can find the user guide here: https://www.ti.com/lit/ug/slvubf0/slvubf0.pdf 

    Thanks,

    Shreyas

  • 0 in reply to Shreyas Dmello
    TI__Genius 9670 points

    Hi Shreyas，

    My customer still doesn't understand how this IC differentiates between different fault types (open circuit/short to battery/short to ground).
    From his understanding, if they don't connect OUT to the IOC's ADC, they can't realize this.
    Can you explain how you think it works? Thank you so much!

  • 0 in reply to Alan Xia
    TI__Mastermind 32650 points

    Hi Alan,

    I recommend reading through the following documents: 

    https://www.ti.com/lit/eb/slyy168/slyy168.pdf - this document is about protection the power path will all the various families of power switches.

    https://www.ti.com/lit/an/slva859b/slva859b.pdf - this document is an in detail look at current limitation for our high side switches.

    Each datasheet has a fault table that describes the conditions necessary to trigger a fault and how it is reported. 

    Do note that in our current series of devices, Open load and short to bat have the same electrical signature and cannot be differentiated from one another.

    Short to GND causes current to flow through the device that is greater than the current limit and this results in a fault report.

    Thanks,

    Shreyas