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BQ76952: 1.2 volts on FUSE pin

Beginner
Intellectual 2461 points
Part Number: BQ76952


Hi Team,

Here is a partial image from customer schematic. As you can see, if we measured the voltage on FUSE pin, we can find the voltage close IC side is 1.2 volts. 

We are confused where is coming from? Could you kindly let pin equivalent diagram to explain? 

  • 0
    TI__Guru* 81035 points

    Hi,

    The FUSE pin will drive a voltage if a permanent failure is triggered and the device is configured to drive the FUSE pin. If this pin is not asserted, it will be in a high impedance state. On the EVM, there is a pull-down resistor on this pin so that the voltage will be pulled low when it is now asserted.

    Best regards,

    Matt

  • 0 in reply to Matt Sunna
    TI__Intellectual 2461 points

    Hi Matt,

    When FUSE is not activated and there is no pull-down circuit, we can measure the voltage on FUSE is 1.2 volts. Customers need a explaination how to calculate this value ? Could you check designer for this question? 

  • 0 in reply to Beginner
    TI__Guru* 81035 points

    Hi Ake,

    From their voltage measurements, it looks like they are seeing 1.2 mA into the FUSE pin. It looks like their device FUSE pin may be damaged. When we measure the FUSE pin, we see 0.2 V across a 10k resistor, so only around 20 uA.

    Have they tried a different device?

    Matt