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BQ34Z100-G1: Gauge reads low current values as zero

Michael Ru
Prodigy 20 points
Part Number: BQ34Z100-G1

Hi,

Setup: 5200mAh battery, 270mOhm sense-resistor, custom PCB

I'm running into an interesting issue where the gauge reads current values < 5mA as 0 instead of their actual value. I'm comparing the fuel gauge readings to the readout from an ammeter connected to the battery.

Fuel gauge current readings above 5mA are perfectly fine.

Any suggestions are helpful!

Thanks,

Michael

  • 0
    TI__Expert 4640 points
    Hi Michael,

    Can you please answer a few more questions here?

    Is this a custom board or the EVM?
    If EVM:
    - Where are your jumpers set on J5 and J2?
    - J5: Shorting Pins ___ and ___, and pins ___ and ___
    - J2: Shorting pins ___ and ___
    If Custom Board:
    - Voltage Divider Values on BAT:
    - High Resistor: __________ Ohm
    - Low Resistor: __________ Ohm
    - Current Sense Resistor: _________ mOhm

    Battery Cell Information:
    - Chemistry: NiMH
    - Max Voltage: ______ V
    - Nominal Voltage: ______ V
    - Capacity: _____ mAH

    Battery Stack/Application Information:
    - Configuration: __S__P
    - Max Load: ________ mA
    - Nominal Load : ________ mA
    - Normal Operating Temperature: _______ degC
    - Operational Temperature Range: ______ degC through _____ degC
    - External Thermistor on Pack: Y / N
    - Pack side or System side Gauge: Pack / System

    thanks

    Miguel

    Perhaps give us the gg file and a log file before and after the event that happens.
  • 0 in reply to Miguel Angel Rios
    Prodigy 20 points

    Found the source of the issue! It was due to the deadband parameter which was set to the default value of 5mA.