BQ40Z50-R1: BQ40Z50-R1 FCC and RM jump at the beginning of charge and discharge

Star Xu

Part Number: BQ40Z50-R1

The customer test with BQ40Z50-R1, the problem is FCC and RM jump at the beginning of charge and discharge. The smooth bit is enabled.

Attached log data and gg file for your reference.

7563.zip 35V.gg.csv

Please help check it.

Thanks

Star

over 1 year ago

0 Shirish over 1 year ago

TI__Guru 57697 points

I am assigning this to an expert

0 Wyatt Keller over 1 year ago in reply to Shirish

TI__Guru** 103155 points

Hello Star,

I took a look at the configuration file, it looks like they have load select set as 3 which is average current. With the load select settings that use the present information for simulation (AvgCurrent, Current, Present Avg Discharge Current, etc) they will use the saved "last run" parameter while in rest. If there is large deviation in the new discharge from the last the FCC/RemCap will be recalculated when the discharge starts with the new load. Also they should only be testing with a constant power discharge, do not do constant current discharging when load mode is selected as 1.

If this does not help please test with the most recent firmware, there has been many improvements to the smoothing algorithm since the -R1 release.

Sincerely,

Wyatt Keller

0 Star Xu over 1 year ago in reply to Wyatt Keller

TI__Genius 9645 points

Hi Wyatt

Thanks for your reply.

How to set the Load Mode and Load Select. Is there any explanation on this?

Thanks

Star

0 Wyatt Keller over 1 year ago in reply to Star Xu

TI__Guru** 103155 points

Hello Star,

Load mode and load select are defined in the TRM.

You can also find further readings on the Impedance Track FAQ page: https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1100653/faq-impedance-track-faqs

Sincerely,

Wyatt Keller

Power management

Power management forum

BQ40Z50-R1: BQ40Z50-R1 FCC and RM jump at the beginning of charge and discharge