BQ27Z746: We following the typical implementation and found the IC can't enter shutdown mode because the ENAB pin always be low, now if we want to enable the shutdown mode , how should we connect the ENAB pin?the

yichong wu

Prodigy 165 points

Part Number: BQ27Z746

over 1 year ago

0 Jonny over 1 year ago

TI__Mastermind 24931 points

Hello,

Your understanding is correct, if ENAB is always pulled low then the gauge will not be able to go into SHUTDOWN mode. I recommend following the BQ27Z746EVM schematic for a reference design on how to connect the ENAB pin, please see the image below.

Regards,

Jonny.

0 yichong wu over 1 year ago in reply to Jonny

Prodigy 165 points

Hi Jonny, I see the resistor to GND is optional, if we just disconnect the ENAB pin, how will it work?

0 Jonny over 1 year ago in reply to yichong wu

TI__Mastermind 24931 points

Hello,

I'm not sure what you mean by "disconnecting the ENAB pin", but you cannot leave the ENAB pin floating. If ENAB is left floating then you will not be able to pull ENAB low to exit Shutdown mode. Please refer to the following e2e thread.

Regards,

Jonny.

0 yichong wu over 1 year ago in reply to Jonny

Prodigy 165 points

Hi Jonny, if we use a power supply to exit the gauge from shutdown mode,can we just floating the ENAB pin? or it still will have other affect?

0 Jonny over 1 year ago in reply to yichong wu

TI__Mastermind 24931 points

Hello,

There should not be any other affect if you leave ENAB floating, other than losing the ability to exit certain power modes.

Regards,

Jonny.

Power management

Power management forum

BQ27Z746: We following the typical implementation and found the IC can't enter shutdown mode because the ENAB pin always be low, now if we want to enable the shutdown mode , how should we connect the ENAB pin?the