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BQ40Z50-R1 Cell calibration

user4498854
Prodigy 30 points
Other Parts Discussed in Thread: BQ40Z50-R1

Hi all,

I'm calibrating the cell gain of bq40z50-R1 with the procedure explained by TI.

Using an external voltmeter, with a 0.1mV precision i'm reading a voltage of 3395.6mV on Cell1.

The raw calibration value written in dataflash at 0x4000 is 12139.

After the calibration, a check with all the 4 cells is performed:

Cell1: External: 3397mV, bq40z50r1 : 3398mV

Cell2: External: 3391mV, bq40z50r1 : 3388mV

Cell3: External: 3396mV, bq40z50r1 : 3391mV

Cell4: External: 3396mV, bq40z50r1 : 3390mV

So we can see that cell1 is correctly calibrated, but cell2-4 have up to 6mV error.

Is it OK ?

Additionally, is is critical to have a 1mV accuracy on BAT and PACK reading ? or a 20-50mV accuracy is enough ?

Thanks,

Philippe