BQ76952: ALERT PIN / Alarm Status

Sho Takayama

Part Number: BQ76952

I use ALERT PIN for safety alert.
For example, when a COV occurs, I confirmed that the COV of SafetyStausA (0x03) is 1, the SSA of AlarmStatus is 1, and the ALERT PIN changes from low to high.
When COV is released, the COV of SafetyStausA (0x03) is 0, but AlarmStatus and ALERT PIN remain the same.
I wrote 0xFFFF to AlarmStatus, but AlarmStatus and ALERT PIN remain unchanged.

Is there a way to reset AlarmStatus and ALERT PIN?

I want to detect the re-occurrence of a safety alert by the edge of the ALERT PIN as well.

Thanks with Regards.

over 1 year ago

0 Luis H. S. over 1 year ago

TI__Mastermind 42060 points

Hello Takayama-san,

When bits are latched into 0x62 Alarm Status(), the host can read the status and clear those latched bits by writing the 0x62 Alarm Status() command with a '1' in one or more of the bits to be cleared, and '0s' in all other bits.

That should clear all ALERT and the pin should become de-asserted.

Do you have any logs of the sequence?

Best Regards,

Luis Hernandez Salomon

0 Sho Takayama over 1 year ago

Intellectual 390 points

Hi Luis

Sorry. There were bugs in my write sending process of Directcommand.

After fix, it worked as expected. ( ALERT PIN ans AlarmStatus was reset by writing 0xFFFF to AlarmStatus .)

Thank you.

+1 Luis H. S. over 1 year ago in reply to Sho Takayama

TI__Mastermind 42060 points

Hello Takayama-san,

Glad to hear that it was fixed .

Best Regards,

Luis Hernandez Salomon

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BQ76952: ALERT PIN / Alarm Status