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BQ34Z100-G1: BQ34Z100-G1 current sense_ GND point different choose lead to the standby current abnormal ——explain the principle

Bode Zou
Prodigy 110 points
Part Number: BQ34Z100-G1


As the BQ34 datasheet , normally we would choose the C point as the GND , and in the standby state, the current is zero, the is the right value.  But if we choose the A point  or B point  as GND,  there is a current value at the BQ34 reading in the standby state, and the B point value is larger than the A point . As my understanding, A, B, C point is same electric potential , Why it would have the different value, could you help me explain the principle ? thanks advance. 

  • 0
    TI__Guru** 105940 points

    Hello Bode,

    The current sensing circuit is very sensitive to small voltage changes. I'm not sure exactly how you're using those points as ground on the circuit, if there is current flowing and you're changing the ground reference you may be getting some I-R losses contributing to the current sensed. Or if the GND line has moved closer to a source of some kind of RF or other switching interference which could couple into the GND line.

    If you could share pictures and explain the test further we may be able to give a better answer. You should also calibrate the gauge for standby current so the offset is accounted for.

    Sincerely,

    Wyatt Keller