BQ76952: Will BQ76932 shut down if it is not pwered to VC16?

Sho Takayama

Intellectual 390 points

Part Number: BQ76952
Other Parts Discussed in Thread: BQ76932,

Tool/software:

I powerd BAT on BQ76932 but not VC16.

Then, REG1 tuened ON but tuened OFF after 1 second.

It was improved when I connected the power supply to VC16, but is there a way to improve it without connecting to VC16?

Regards

over 1 year ago

+1 Thomas Rainey over 1 year ago

TI__Expert 4320 points

Hello,

It is not recommended to have VC16 disconnected. VC0-VC1, VC1-VC2, and VC15-VC16 must have cells connected between them. VC16 is the top-of-stack (ToS) measurement point, measuring VC16 to Vss. The device may not behave as intended if these cells are not connected.

Information on how cells are connected can be found in the following FAQ: How should I connect battery cells to the BQ769x2 family of monitors?

Best regards,

Thomas Rainey

0 Sho Takayama over 1 year ago in reply to Thomas Rainey

Intellectual 390 points

Hi Thomas

Thank you for your response.

I boot host MCU by LDO(REG1) of BQ76952.

And, I want to boot MCU without connecting cells.(To operate MCU unit tests, etc.)

In the case, is there no other way but to operate it with BAT and VC16 connected?

Regards

+1 Thomas Rainey over 1 year ago in reply to Sho Takayama

TI__Expert 4320 points

Hi Sho,

The device may not behave as intended if BAT and VC16 are disconnected.

The BAT needs at least 4.7V to operate:

VC15 to VC16 need to have physical cells present.

Best regards,

Thomas Rainey

0 Sho Takayama over 1 year ago in reply to Thomas Rainey

Intellectual 390 points

Thank you.

I understand.

Regards.

Power management

Power management forum

BQ76952: Will BQ76932 shut down if it is not pwered to VC16?