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TMDSCNCD28379D: Control board card power monitor reset circuit issue

Part Number: TMDSCNCD28379D

Hi team,

Here's an issue from the customer may need your help:

The power sense chips TPS3702CX33DDCT and TPS3702CX12DDCT designed on the control board card, why is the OV port open-drain output connected to the GPIO-168 pin? And GPIO-168 does not come out to HSEC? How can the DSP be effectively shut down in the event of an overvoltage?

Could you help check this case? Thanks.

Best Regards,

Cherry

  • Hi Cherry,

    why is the OV port open-drain output connected to the GPIO-168 pin?

    This is so the F2837x device can be notified through GPIO input that there's an OV condition and respond in some way.

    How can the DSP be effectively shut down in the event of an overvoltage?

    I think this would need to be handled some way in software or triggered from GPIO input. Let me see if another expert can comment on generating a reset through these methods.

    Best,

    Kevin

  • Hi Cherry,

    I checked with a reset expert on my team and have the information below for the customer.

    GPIO168 can be configured as an external interrupt (XINT) using the input XBAR. This can then be configured to generate an interrupt based on a low-going input pulse during an OV condition and then within the ISR you can write a bad key to the WDCR register which in turn triggers a reset.

    Best,

    Kevin