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BQ76952: Current sense shunt simulation test

Hitesh Jangra
Prodigy 50 points
Part Number: BQ76952

I want to ask how we can perform the current sense shunt simulation test for the IC BQ76952, 
I have applier 1mV Btw sense+ & sense - , before that, it shows 10-20mA discharging current but after applying a voltage to pin it shows 350-400A discharging cuurent also i have measured the voltage diff btw them and it show 1.2-1.6V

I have used your typical application schematic refer in datasheet

  • 0
    TI__Mastermind 42060 points

    Hello Hitesh,

    What is the voltage reading on the SRN/SRP pins? Where are you applying the voltage, is this being filtered? Is there any issue if you apply a known current through the board?

    The supply you use should ideally be very accurate and not noisy. Coulomb Counter gain/offset may be needed for best accuracy. 1-mV on a 1-mOhm sense resistor should indicate 1-A of current flowing on the resistor.

    For it to read 350-A (assuming 1-mOhm resistor), the voltage on the SRN/SRP pins would have to be ~350-mV. Which goes beyond our recommended voltage range for the shunt measurements.

    Do you have a schematic?

    Best Regards,

    Luis Hernandez Salomon