BQ25125: EN_SYS_OUT Use?

Trey German8

Expert 1920 points

Part Number: BQ25125

Power Mangement Rockstars,

I've got a BQ25125 on my application and I'm slowly bringing it up. Overall first impressions of the device are that its freaking awesome, but I've run into a small issue.

Despite the datasheet clearly saying "The SW output is enabled using the EN_SYS_OUT bit in the register. This bit is for testing and debug only and not intended to be used in the final system.", I would like to use it to gate power to all the devices connected to this rail. What I've noticed is that when I clear this bit and turn off the buck converter, the device no long ack's any I2c communication to it. Is this expected behavior? Could you elaborate on why this bit should not be used in the end application?

Thanks for your time,

Trey

over 3 years ago

0 Raheem over 3 years ago

TI__Mastermind 21590 points

Hello Trey,

This is expected behavior. The bit is meant for testing production testing only and should not be used in your final system because a reset will be required to turn on SYS if it is disabled by that bit.

0 Trey German8 over 3 years ago in reply to Raheem

Expert 1920 points

Raheem,

Thanks for the quick response. I'll gate power elsewhere.

I do think making this bit usable in end applications would be nice if a rev of the device ever happens and this is easily accomplished.

Power management

Power management forum

BQ25125: EN_SYS_OUT Use?