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BQ76PL455A: how to text conductor voltage between cells use BQ76PL455

user5134806
Prodigy 70 points
Part Number: BQ76PL455A

   in my application， there  is a long conductor between 7rd and 8rd cell，the conductor voltage about 0~800mV，can I use BQ76PL455A-Q1 （VSENSE8 & VSENSE7）to test the conductor voltage？if cannot，do you have good idea？thanks。

  • 0
    TI__Genius 11480 points
    Hi user,

    Unfortunately, this is one of the biggest challenges with the pl455. Remember, the conductor voltage can be a negative value during discharge, which our ADC cannot support. Measuring this voltage drop can also result in the voltage rating for the sense pins being violated.

    If possible, I think it would be good to use a thicker conductor to reduce the voltage drop. Alternatively, you could think about splitting it into two modules.
  • 0 in reply to David Wiest Jr
    TI__Prodigy 685 points

    Hi  David,

    Do we have the spec for the maximum time for Vsense channel to survive under -0.3V?

    What is the power grade of internal TVS protection in Vsense pin ? Thanks.

  • 0 in reply to Cheng Wang
    TI__Genius 11480 points

    Hi Cheng,

    Those diodes are for ESD protection and  not meant to protect the pin from negative  voltages. Customers will sometimes bring this up as a solution, but I do not recommend this at all.