BQ76940: BQ76940 AFE internal CC VREF

rohsik_j

Part Number: BQ76940

Hi..

BQ76940 AFE has Internal CC VREF for Current sense voltage reference but in the datasheet, not mentioned what is the actual CC VREF Value.

8 months ago

0 Luis H. S. 8 months ago

TI__Mastermind 34030 points

Hello Rohsik,

We are not able to open google drive files. You'd need to upload the file here.

Yes, this value is not provided in the datasheet. You can read the Embedded Scheduler in Cell Battery Monitor of the bq769x0 app note to see how the ADC works. We would not able to share the VREF value itself.

Best Regards,

Luis Hernandez Salomon

0 rohsik_j 8 months ago in reply to Luis H. S.

Prodigy 165 points

Hi Luis,

I checked in Embedded Scheduler in Cell Battery Monitor of the bq769x0 this document about AFE VREF but there is no information about this value, why do I need this VREF, I need to find the current measurement ADC accuracy calculation for my design.

0 Luis H. S. 7 months ago in reply to rohsik_j

TI__Mastermind 34030 points

Hello Rohsik,

For current accuracy, I would recommend to read this older E2E I wrote about it:

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1279887/bq76930-bq76930-how-to-calculate-the-current-accuracy

The current accuracy can be estimated with datasheet-provided values. I do not believe the CC VREF would help much in this case.

Best Regards,

Luis Hernandez Salomon

Power management

Power management forum

BQ76940: BQ76940 AFE internal CC VREF