BQ24297: BATFET can't normally turn on

Hi,

Are you trying to operate in charge mode or OTG mode? Please set REG01[5:4]=10 or REG01[5:4]=01 and try again.

Thanks,

Ning.

Hi Ning,

Could you please explain why you want set REG01[5:4]=10 or REG01[5:4]=01?

Are you consider REG01[5:4] should not be "11"?

But we only have one device have this fail symptom, I'm worry about if set REG01[5:4]=10 or REG01[5:4]=01 then fail symptom disappears.

Is there have any other way to know BQ24297 is which status?

Thanks!

Jeff

Hi Ning,

Any update for this issue?

Or we can plan a conference call to discuss this issue?

Thanks!

Jeff

Hi Ning,

Update one more information, we had write REG04[0] "VRECHG" from 0 to 1, and tried read back this register still "1",

it mean BQ24297 is active and can be write by host.

And another question,

How does the watchdog  timer work? As I know, BQ24297 can be work stand along without host, and use default register setting to charge.

It means even no I2C signal still can work. But watchdog timer seems needs I2C period kick BQ24297 to let it normal  work.

Or under stand along charging, it used other signal to kick watchdog? or it does not need watchdog timer in stand along charging?

Thanks!

Jeff

Jeff,

Referring to 9.4.1 Host Mode and Default Mode on the d/s, the device is can operate in default mode without host management. In default mode, the device can be used as an autonomous charger with no host or with host in sleep. In default mode. All the registers are in the default settings.

 

Any write command to device transitions the device from default mode to host mode. All the device parameters can be programmed by the host. To keep the device in host mode, the host has to reset the watchdog timer by writing 1 to REG01[6] before the watchdog timer expires (REG05[5:4]), or disable watchdog timer by setting REG05[5:4] = 00.

Thanks,

 

Ning.

 

Hi Ning,

I saw the watchdog explanation, thanks for the information.
But any update for the BATFET can’t normally turn on issue?
Except write set REG01[5:4]=10 or REG01[5:4]=01, do you have any other suggestions?
We have 2 fail device but 1 device fail symptom disappears after remove battery. We now only have 1 fail device on hand, and still try to reproduce and find other fail device.
So we worry about if set “REG01[5:4]=10 or REG01[5:4]=01” will let the fail symptom disappear, we need to know BQ24297 in what status and find root cause.

Thanks!
Jeff