BQ27750: Not responding in BQ Management Studio

Bailey Noack

Part Number: BQ27750
Other Parts Discussed in Thread: EV2400

I can't communicate with the BQ27750, it appears to be in stuck in sleep mode or locked in some way. The gas gauge is being used in a battery protection circuit, and because of this the battery is not working.

over 5 years ago

0 Andy Liu (BMS) over 5 years ago

TI__Guru 52115 points

Hi Bailey,

I would suggest you apply a voltage (e.g 3.5V) on the Pack+ terminal and wake up the gauge device.

Andy

0 Bailey Noack over 5 years ago in reply to Andy Liu (BMS)

Prodigy 30 points

Hi Andy,

Thank you for the suggestion, I forgot to mention I've attempted to charge the pack with no success. The pack doesn't draw any current when attached to a power supply.

Bailey

0 Kang Kang over 5 years ago in reply to Bailey Noack

TI__Mastermind 24870 points

Hello Bailey,

Can you monitor the PBI pin?

I would also suggest trying a different device, perhaps the device is damaged. Also make sure you have pull up resistors on the I2C bus.

0 Bailey Noack over 5 years ago in reply to Kang Kang

Prodigy 30 points

Hi,

I cannot monitor the PBI pin, unfortunately it's inside the battery. I'm using the EV2400 that should have internal pull up resistors. I have been able to communicate fine with different batteries in the same lot, and this one was working to begin with. I can't seem to get this specific gauge to wake up.

Thanks again for the help,

Bailey

0 Kang Kang over 5 years ago in reply to Bailey Noack

TI__Mastermind 24870 points

Hello Bailey,

Perhaps the gauge is damaged. I would try to access both TS and PBI pins to see what's going on.

Power management

Power management forum

BQ27750: Not responding in BQ Management Studio