Hey Battery Fuel Gauge team,
I have a customer evaluating the BQ40Z80 for a new design and we are running into a problem which I'm hoping you can help to provide some clarity on. Please see a summary below of the issue and let us know if you need any additional info to provide guidance!
Summary of issue: We are seeing the BQ40Z80 reset after a series of SMBus communications. The BQ chip successfully communicates for a few seconds before resetting. It seems to be fixed when we reduce the rate at which we communicate with the BQ.
It seems to happen after a read that doesn't return real data and instead returns 20 bytes of 0xFF. In the logic data attached below (acquired by using a Salae), the failure happens after an attempted read at manufacturer access code 0x0071 (DAStatus1). You can see that before the failure, we successfully read the DAStatus1 register previously multiple times. After a few seconds in, the chip resets.
The voltage line that goes up to about 12V is the battery output voltage.
Any ideas of what might be causing this?
https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/196/CUP_5F00_boot_5F00_reset_5F00_battery.sal
Best regards,
Matt Calvo
