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Ground Levels BQ34Z100-G1 and MCU

Michael Moitzi
Prodigy 60 points

Hi

I am using the BQ32Z100-G1 to monitor a 2s/8.4V LiIon battery pack. My application is powerd from this battery. As indicated in the datasheet I connected the GNDs of the BQ34Z100-G1 directly to batteries ground. But the Microprocessor uses the ground level which has the sense resistor in series. In my application load currents of up to 5A are possible. Can the ground bounce between the MCU and the BQ34Z100-G1 lead to failing data transmission using the I2C bus?

BR

Michael

  • 0
    TI__Guru 73830 points
    Ground bounce can cause communications problems, but there should be enough Vil margin to allow reliable operation. Assuming that you are using a 10 mohm sense resistor, the voltage drop for a 5A current will only be 50mV.