BQ769142: BQ769142: DASTATUS6() Coulomb Reading Problem

Star Xu

Genius 9645 points

Part Number: BQ769142

I have a query need your help.

UseA uses 1mA,

1, Current sense resistors use 2 m Ω,

2, Current sense resistors use 1 m Ω,

Does it need to make any adjustments of the settings when using different Current sense resistors?

Thanks

Star

over 2 years ago

+1 Max Verboncoeur over 2 years ago

TI__Mastermind 25585 points

Hi Star,

See the attached image, taken from the TRM.

To account for the change in the sense resistor value, you will need to recalculate the CC Gain and Capacity Gain values and load them into the appropriate registers.

Can you follow these steps and see if it resolves your problem?

I hope this helps!

Regards,

Max Verboncoeur

0 Star Xu over 1 year ago in reply to Max Verboncoeur

TI__Genius 9645 points

Hi Max

Thanks for your help.

Do CC Gain and Capacity Gain values need to be converted using IEEE754 to write 4 Byte to BQ769142 through I2C?

https://www.h-schmidt.net/FloatConverter/IEEE754.html

Waiting for your reply.

Thanks

Star

0 Max Verboncoeur over 1 year ago in reply to Star Xu

TI__Mastermind 25585 points

Hi Star,

I'm glad I could help.

Looking at the section I attached before: "Both the CC Gain and Capacity Gain are encoded using a 32-bit IEEE-754 floating point format." It looks like yes; you will need to convert the values to an IEEE-754 floating point value before writing them to the device's memory.

There are some additional instructions on the conversion in Section 3.3.3: Floating Point of the TRM.

Regards,

Max Verboncoeur

Power management

Power management forum

BQ769142: BQ769142: DASTATUS6() Coulomb Reading Problem