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BQ27010 overall accuracy, transfer function, latency

AISSOU Khaled
Prodigy 20 points
Other Parts Discussed in Thread: BQ27010, BQ26220

 

Good Morning,

 

 

I am working on BMS that's requires high coulometric measurement accuracy, two battery IC monitor devices (Bq27010) and Bq26220 (21)) sould be implemented. I would like to have further information about:

 

 

Bq27010:

 

Relation between the output conversion (MicroVh) and input voltage developped across the sense resistor

 

How to estimate the overall accuracy of the output data (unit : microVh), including the following information:

 

fOSC Internal oscillator frequency -2.2% 1.5%

 

Current gain variability -0.5% 0.5%

 

Coulometric gain variability -1.7% 0.5%

 

Coulomb counter input offset(1) -15 0 15

 

μ

V

How fast fully conversion can be performed between the initiated of the input signal conversion and the output data (coulombs couting) => Delta sigma latency (is second)

 

 do you have any suggested solution for

high coulometric measurement accuracy using other bq ?

Best regards

Thank you very much