BQ76952: The sampling rate for Accumulated capacity

Beginner

Intellectual 2421 points

Part Number: BQ76952

Tool/software:

For 0x76, we can read out accumulated charge capacity.

Just curious what's sampling rate for this. I don't think it's 250ms.

5 months ago

0 Beginner 5 months ago

TI__Intellectual 2421 points

Hi Team,

Any update for this?

0 Kian Lin 5 months ago in reply to Beginner

TI__Expert 4220 points

Hi Beginner,

It's 250ms. CC1 filter generates the charge integration which is updated every 250ms.

BRs

Kian

0 Beginner 5 months ago in reply to Kian Lin

TI__Intellectual 2421 points

I think it's CC1 w/ filter. What I am asking is our sampling for CC.

If it's 250ms, the accumulated capacity is not accurate if the current is changing very fast.

Could you help to double confirm?

0 Kian Lin 5 months ago in reply to Beginner

TI__Expert 4220 points

Hi Beginner,

The current sampling rate is 1.5ms(FASTADC=1) or 3ms(FASTADC=0). CC2 is updated every sampling period. If you want to calculate the charge integration by yourself, you can use sync V/I with reading CC2 raw count. If you want read the accumulated charge provided by BQ76952, it is updated every 250ms. But it doesn't mean it samples the current every 250ms, the sampling frequency is always 1.5ms or 3ms. Just CC1 filter is 250ms.

BRs

Kian

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BQ76952: The sampling rate for Accumulated capacity