S32K中的主题 Re: mc33774 balancing not working second time

mc33774 balancing not working second time

Thom_H — Wed, 09 Jul 2025 11:58:27 GMT

Hello Forum,

I am currently working on implementing balancing while charging, I use undervoltage based balancing. The first time works great, balancing stops when the cells reach the given voltage (for now sliders on the battery cell emulator)(I check the bal_stat0 register to see if all (8) cells stopped balancing). When i try to balance again after a while (simulating charging), the balancing itself doesnt start anymore, even though i use the same balancing starting function.

Is there a register i need to reset or write to, to allow balancing for a second time?

I also use the s32k358 bmu and the bcc_774A driver for the cmu.

Thanks in advance,

Thom

Re: mc33774 balancing not working second time

RafaR — Thu, 10 Jul 2025 19:45:16 GMT

Hello Thom_H

Which measurement mode are you using?, cyclic mode?

Could you check the BAL_GLOB_CFG and BAL_CH_CFGx registers, are you clearing them after each measurement?

I recommend you refer to the following community case:

MC33774 cell voltage errors

It has useful information and also explains how to access two very useful documents: MC33775A and MC33774A measurement and Errata sheet for MC33774A

Both are secure documents, so your company must first have an NDA with us.

I hope this information has helped you, please let me know if you need help with anything else.

Have a great day and best of luck.