BQ76952: In reference to TIDA-010208, we are using PTC with sufficient current rating instead of 0 Ohm, for R111

Embedded Developer

Part Number: BQ76952
Other Parts Discussed in Thread: TIDA-010208

Tool/software:

Hello,

Referring to TIDA-010208 as a reference for our design, we are observing a current noise of 167 mA at idle(NO LOAD/DSG-CHG OFF) for few seconds, on heating R111 which is a PTC in our case (of sufficient current rating for general operation) above 80 ° C. We suspect the connection of PTC between BAT - and GND is creating a noise in current readings. We are using shunt of 0.1 mΩ in our BMS.

Can you help us understand the cause of the above problem.

Regards and thankyou

9 months ago

0 Alexis_H 9 months ago

TI__Genius 17795 points

Hello User,

Are you seeing those same results without the PTC as well?

Best Regards,
Alexis

0 Embedded Developer 9 months ago in reply to Alexis_H

Intellectual 315 points

Hello Alexis,

Yes we tried the same test by replacing it with a 0 Ω we found a 80 mA noise on heating to 80-100 ° C, but the frequency of this happening is much less as compared to previous case mentioned.

Regards

0 Luis Torres 9 months ago in reply to Embedded Developer

TI__Expert 3425 points

Hello,

We have received your request and will work to answer it as soon as possible.

Our normal support team is OOO and will be returning 12/10 to help with any ongoing inquiry.

We appreciate your patience and understanding.

Best,

-Luis Torres

0 Alexis_H 9 months ago in reply to Embedded Developer

TI__Genius 17795 points

Hello User,

Thank you for your patience.

We don't recommend changing the GND reference of the part. R111 should be 0 ohms.

Best Regards,
Alexis

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BQ76952: In reference to TIDA-010208, we are using PTC with sufficient current rating instead of 0 Ohm, for R111