BQ76952: BQ76952 ADSCAN

Star Xu

Part Number: BQ76952

I have a query need your help.

When we use BQ76952 to get 16 channel cells voltage and 5 channel temperature, we must get these data in 100 ms. There is a question that when we get voltage and temperature according to full scan flag of alarm status, we should take 194 ms to confirm the full scan flag become 1 from 0. We hope to get voltage and temperatue according to adscan flag of alarm staus , we find that there is only 65 ms for ad scan flag to becom 1 from 0. Pls help us to confirm that we can use ad scan flag or not.

Waiting for your reply.

Thanks

Star

over 3 years ago

0 Matt Sunna over 3 years ago

TI__Guru* 81035 points

Hi Star,

The voltage measurements are completed every ADSCAN period, but you will not be able to measure all 5 thermistors within the same time period. Figuere 1 in this technical article shows the details of the ADSCAN and FULLSCAN measurement loop: https://e2e.ti.com/blogs_/b/powerhouse/posts/improving-voltage-measurement-accuracy-in-battery-monitoring-systems

Best regards,

Matt

0 Star Xu over 3 years ago in reply to Matt Sunna

TI__Genius 9645 points

Hi Matt

Thanks for your reply.

I want to know the actual measurement resolution between low adc conversion speed and high adc conversion speed 。

ACCORDING TO FASTADC FLAG: Selects ADC conversion speed for voltage and simultaneous current measurements. Higher speed results in lower accuracy.
0 = 3 ms per conversion
1 = 1.5 ms per conversion

Waiting for your reply.

Thanks

Star

0 Matt Sunna over 3 years ago in reply to Star Xu

TI__Guru* 81035 points

Hi Star,

This is shown in the datasheet (see Section 7.19 Code Stability spec).

Best regards,

Matt

Power management

Power management forum

BQ76952: BQ76952 ADSCAN