BQ76930: BQ76930 junk values

Akilan G

Part Number: BQ76930
Other Parts Discussed in Thread: BQ78350-R1, BQ78350

Hello sir,

we have developed 6S3P BMS using BQ76930 AFE and BQ78350-r1 with reference to EVM BQ76930 design. The issue we are facing is, the AFE is giving junk values in 10 seconds interval. We logged in bq769x0 Evaluation software. I am attaching the Excel sheet in this thread. Please look into it.

Thanks,

Akilan G q.log.zip

over 8 years ago

0 Vish Nadarajah over 8 years ago

TI__Expert 6085 points

was this datalog captured when the gauge was hooked up or the bq78350 was disconnected?

0 Akilan G over 8 years ago in reply to Vish Nadarajah

Intellectual 285 points

Hello sir,

Thanks for the reply, the bq78350-r1 was disconnected and we connected i2c to bq76930 and logged the data in bq769x0 evaluation software.\

Akilan G

0 Vish Nadarajah over 8 years ago in reply to Akilan G

TI__Expert 6085 points

2Customer_poll_issue.zip

Tried your setting on the TI-EVM using the bq76930. There are no spurious data being sampled periodically as you had noted .

zip files have different settings(CC= on /off; Inter/external temp) for your review. I suspect there is some bus contention ( if you have other I2C devices loading on the communication bus) OR the WIN environment is polling the USB.

0 Akilan G over 8 years ago in reply to Vish Nadarajah

Intellectual 285 points

Hello sir,

So, you think this might be a hardware issue in the design because I have eliminated few simulating circuits and few unused components like Cf and Rf circuit in the design.

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BQ76930: BQ76930 junk values