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Cell Balancing not working again on MC33774A

Hi everyone,

I am working with the MC33774A to balance cell pins. First, I set balancing for cell 1 (3.7 V) with an under-voltage threshold UV0 = 3.6 V. When I read the BAL_CH_UV0_STAT0 register, the value is 0x0C00. This makes sense because cell 11 (3.4 V) and cell 12 (3.3 V) are below the threshold.

Then, I changed the under-voltage setting to UV0 = 3.2 V (lower than 3.6 V) and activated cell balancing for cell 11 and cell 12, but it did not work.

After referring to the MC33774A datasheet, I realized that in voltage-controlled mode there is a third input, which is the status of BAL_CH_UV0_STAT. So, I want to clear the bits of BAL_CH_UV0_STAT (from 0x0C00 to 0x0000) to allow the balancing process to run again.

However, these bits are read-only, with a “read clears bit” behavior. I tried to read the entire BAL_CH_UV0_STAT0 register using the command:

Bcc_774a_COM_ReadRegisters(BCC_CHAIN_ADDR, 1, MC33774_BAL_CH_UV0_STAT0_OFFSET, 1, Bms_TD);
 
But the returned value of BAL_CH_UV0_STAT0 is always 0x0C00. It seems that the bits are not being cleared. 

Currently, I am facing an issue where I cannot clear the bits in the BAL_CH_UV0_STAT0 register, and I would appreciate any help.

Re: Cell Balancing not working again on MC33774A

HI 

Please follow below step to set CB function under UV condition,seems you don't have correct steps setting for this CB function test.:

1: wake up and assign CID

guoweisun_0-1780887697263.png


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