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DRV8803: 14.6V measured at INX pin

Cherry Zhou
Mastermind 22235 points
Part Number: DRV8803

Hi team,

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

The customer measured 14.6V on the INX pin of the chip, and the chip is able to working properly. While according to the manual, the input range for INX is -0.5 to 7V. The customer would like to know will this voltage cause some damage to the chip?

https://support.ti.com/sys_attachment.do?view=true&sys_id=ab3b654347645dd8d4f52e61e36d43dd

https://support.ti.com/sys_attachment.do?view=true&sys_id=e4a3529f4720151cd4f52e61e36d4385

Also the customer has submitted a ticket:

https://support.ti.com/csm?id=ticket&is_new_order=true&table=sn_customerservice_case&sys_id=d1ba250f47245dd8d4f52e61e36d4337

Could you help check this case? Thanks.

Best Regards,

Cherry

  • 0
    TI__Mastermind 37683 points

    Hi CHerry,

    I am unable to open any of the links attached. Can you attach them as images instead?

    Cherry Zhou said:
    The customer measured 14.6V on the INX pin of the chip, and the chip is able to working properly. While according to the manual, the input range for INX is -0.5 to 7V. The customer would like to know will this voltage cause some damage to the chip?

    The answer is yes. it is double the abs max rating for this pin. it can potentially cause damage to the driver. A good way to check if the pin is damaged is to measure the resistance of the pin to the device GND. If it is a low impedance, or varies greatly from the impedance of a new device, then it points to some damage occurring at the pin.

    Regards,

    Pablo Armet