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BQ76930: Why is there series resistors and capacitors for Rsns for current sensing?

Eohan George22
Intellectual 620 points
Part Number: BQ76930

Are the resistors(red arrow) and capacitors in the circuitry for Rsns current sensing circuitry for low pass filtering ? Should they be matched or changed for varying Rsns values ? 

Are they 100ohm and 0.1uF values accounting for the coulomb counting measurement updates ?  

  • 0
    TI__Prodigy 680 points
    Hi Eohan,
    Our team is currently enjoying the Thanksgiving break and will come back to you when we return, during the week of November 26th
  • 0 in reply to bdefar
    TI__Guru* 80963 points
    Hi Eohan,

    The external filter is used to average the current across the sense resistor during the sample period (sampling occurs every 4 us). The values do not need to change for different Rsns values.

    Best regards,
    Matt