BQ40Z50-R2: bq40z50 FUSE Drive

Chen Allen

Part Number: BQ40Z50-R2
Other Parts Discussed in Thread: BQ40Z50

We use EVM to verify bq40z50 1S design but Fuse pin output only has 2.6V when VBAT = 3.6V.

Fuse pin output should be equal VBAT-0.1 ~VBAT in bq40z50 Data sheet.. Could you help to confirm it?

0 Batt over 5 years ago

Hi Chen,

Yes, that is confirmed.

0 Chen Allen over 5 years ago in reply to Batt

But we measure the fuse pin , it only has 2.6V when VBAT is 3.6V. it is not meet spec.

0 Onyx Ahiakwo over 5 years ago in reply to Chen Allen

Hi Chen

Are you using this for a 1s application? Why is vbat 3.6V? If you configure it for 2s, what does the fuse pin measure?

thanks

Onyx

0 Chen Allen over 5 years ago in reply to Onyx Ahiakwo

Hi Onyx,

Yes this is 1S application. if bat > 8V, gauge can meet spec. why fuse pin did not equal bat voltage when vbat voltage less then 8V?

It is my test result.

For 2 S , set vcell 1 ,2 = 4.1V Vbat=8.2V fuse pin = 6.15V

For 2S , set vcell 1 ,2 = 3V Vbat=6V fuse pin = 4.58V

For 1S , set vcell 1 3V Vbat=3V fuse pin = 2.6V

Allen

0 Kang Kang over 5 years ago in reply to Chen Allen

Hello Allen,

Do you have current running through the board when you perform these measurements?

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