BQ76952: How can the host MCU clear protection events of BQ76952?

Sho Takayama

Intellectual 390 points

Part Number: BQ76952

Tool/software:

Hi,

I want to forcefully clear the protected state.

( Safety Alert, Safety Status, each counts of the delay, etc )

How can the host MCU clear them?

Thank you,

Sho Takayam

over 1 year ago

0 Thomas Rainey over 1 year ago

TI__Expert 4320 points

Hi Sho,

You can try pulling the RST_SHUT high for less than 1 second, to see if a partial reset will reset them.

If that doesn't work, you can send the 0x0012 RESET() subcommand. This will reset all the digital logic as well as clear all registers not programmed using OTP.

It is important to note if the state that caused the alert (a short circuit for example) is still active after the part resets, the alert and status will trigger again.

Best regards,

Thomas Rainey

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

Intellectual 390 points

Hi Thomas,

Does this mean that there is no way to reset only the protection detection state?

>>You can try pulling the RST_SHUT high for less than 1 second, to see if a partial reset will reset them.
Is it the "RESET:PARTIAL"?
https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1181117/faq-bq76952-how-do-i-reset-the-bq769x2-device
I thought that it reset only the serial communication bus and not registers of BQ7952.
Are Registers reset also?
I set registers(Data Memory Access)(I don't write OTP) at power-on, do I need set again after "RESET:PARTIAL"?

Thank you,

Sho Takayama

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

TI__Expert 4320 points

Hi Sho,

The partial reset should reset the serial communication bus and the active faults. This will not reset any RAM registers.

Best regards,

Thomas Rainey

Power management

Power management forum

BQ76952: How can the host MCU clear protection events of BQ76952?