BQ40Z50-R1: balance testing

Maxim Fiodorov

Part Number: BQ40Z50-R1

Hi eveone.

As I understand bq40z50-R1 activates cell balance on specific cell according to delta capacity of this cell with respect to other cells.

How can I mandatory activate the balance on specific cell during board testing???

over 3 years ago

0 Jessica H. over 3 years ago

TI__Genius 11535 points

Hi Maxim,

It is not possible to turn on cell balancing for a single cell. This is handled by an algorithm that balances all cells and will only do it once an OCV is taken to calculate the delta capacity.

0 Maxim Fiodorov over 3 years ago in reply to Jessica H.

Prodigy 180 points

Hi Jessica.

If I power up the board then cell voltages are not the same. For example 3 cells at 3.3V and forth cell at 4V. Will it causes bq40z50-R1 to activate balance on forth cell?

0 Jessica H. over 3 years ago in reply to Maxim Fiodorov

TI__Genius 11535 points

Hi Maxim,

The gauge will need to take an OCV measurement to calculate the delta capacity in order to trigger cell balancing.

0 Maxim Fiodorov over 3 years ago in reply to Jessica H.

Prodigy 180 points

Hi Jessica.

How can I cause bq40z50-R1 to take OCV measurement and calculate delta capacity?

0 Jessica H. over 3 years ago in reply to Maxim Fiodorov

TI__Genius 11535 points

Hi Maxim,

The gauge has to be in RELAX mode in order for an OCV measurement to take place. This is controlled by the Impedance Track algorithm. Please refer to section 7.2 in the BQ40z50-R1 TRM.

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BQ40Z50-R1: balance testing