data/text/DLP2/881174

BQ30Z554-R1: bq30z55DBTRRR3 DFW issue

Part Number: BQ30Z554-R1 Hi Team, i have a problem,cusotmer use BQ30Z55DBTR-R3 for battery pack solution has been M/P,but DFW issue occur random. was started by DFW, we have reset IC to clear the PF flag but DFW still happen, how can i avoid this problem? or have any idea and suggestion for us. attachment is schematic. JM2SP068PPV600A_schematic (003).pdf

Hello Tommy, Sorry, can you clarify, what is DFW?

Hi Kang Kang, FYI.

Hi Kang Kang, have any idea or suggestion?

Hello Tommy, Can you check the cycle count and attach the gg file? The DF flash write not successful may mean that the flash is worn out. If this is the case, we should see a high cycle count number in the gg file.

Hi Kang Kang, but will this this complete charge and discharge increase once? does this have anything to do with the number of write? because we have confirmed that the cycle count of the PACK returned by DFW is more 100 and more than 200,but there are also less than 100, so i don't see this kind of problem appear in the datasheet after using DF flash write many times, so could you help confirm this issue?or is there any way to avoid this kind of problem.

Hello Tommy, This most likely means a dataflash is worn out. I am just wondering how many times this has been out in the field. I'll check the conditions for this bit setting.

Hello Tommy, During firmware operation, the gauge will try to update Ra tables or Qmax or lifetimes or some other impedance tracking parameter. The bit is set because when the gauge writes to flash, it will try to read back what it wrote. In this case, if the read back is different, the DFW bit is set. The most likely reason would be dataflash is worn out. Can you provide more information on how many packs are experiencing this failure? It could be that some of these packs may have been subject to multiple host side writes and caused the flash to wear out and gauge to unable to write to flash. Who is the end customer?

Hi Kang Kang, Can you provide more information on how many packs are experiencing this failure? ans:11/55000 failure rate 0.02%, end custimer is Pegatron. if have DFW problem issue, will it cause IC damage? ic function be normal? as attached is customer the gg file, please reference. JS4HS002P1542000101.txt

Hello Tommy, This does look like a potential flash corruption. Are you able to still communicate with the "DFW bit set packs"?

Hi Kang Kang, if DFW is turn off(n/a), what other offect will it have?