BQ40Z50EVM-561: bq40z50evm,I have a battery pack (4s1p LIFEPO4 ) connected internally with the fuel gauge .

Naveesh Boppana

Part Number: BQ40Z50EVM-561
Other Parts Discussed in Thread: BQSTUDIO, BQ40Z50

I set the term voltage pack to be 11.4v and Term voltage cell to be 2.8v . But the discharge keeps going down until 10v and it keeps discharging the battery . I dont know what setting I need to change from this to happen .

Thanks,

Naveesh

over 6 years ago

0 Matt Sunna over 6 years ago

TI__Guru* 81035 points

Hi Naveesh,

Have you enabled CUV (Cell Undervoltage) protection and set the CUV threshold? The default value is 2500mV which is based on Li-Ion.

If this is not the issue, can you send your .gg file? You can get this file by clicking on the Export button in the Data Memory screen of bqStudio. This way we can look at your settings to see what might be wrong.

Best regards,
Matt

0 Naveesh Boppana over 6 years ago in reply to Matt Sunna

Intellectual 430 points

bqstudio ti.gg.xlsx

0 Naveesh Boppana over 6 years ago in reply to Naveesh Boppana

Intellectual 430 points

Please find my attached .gg file I could not upload it in .csv file .

0 Matt Sunna over 6 years ago in reply to Naveesh Boppana

TI__Guru* 81035 points

Hi Naveesh,

After a quick look at the .gg file, I can see that you CUV protection is enabled, but the voltage is set to 2500mV. You should change this to 2800mV if you want the discharge FET to open at that voltage. Go to Data Memory -> Protections -> CUV Threshold to set this value.

There is a new video on the TI training site on setting up the BQ40Z50. It might be very helpful as you continue developing with this device.
training.ti.com/bq40z50-setup-and-going-production

Best regards,
Matt

0 Naveesh Boppana over 6 years ago in reply to Naveesh Boppana

Intellectual 430 points

Okay thank you . I thought I just needed to mention the discharge cutoff in term voltage .

Power management

Power management forum

BQ40Z50EVM-561: bq40z50evm,I have a battery pack (4s1p LIFEPO4 ) connected internally with the fuel gauge .