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BQ27750: Data Flash Table undefined addresses confirm

Bruce li
Genius 5580 points

Part Number: BQ27750

Dear TI Experts,

From the data flash table of BQ27750 below, we can see lots of undefined addresses, such as 0x4020, 0x4030.... when my customer conduct the DF checking during manufacture process, they find the data value of some undefined addresses is changing from time to time. Is it ok if they skip these undefined addresses, any potential risk? Thanks a lot.

  • 0
    TI__Mastermind 24870 points
    Are they trying to perform calibration?
  • 0 in reply to Kang Kang
    Genius 5580 points

    Dear KangKang,

    Customer perform calibration at begining and assemble gauge board together with battery cell to the whole pack, then they will conduct the Data Flash checking on the pack.

    They find that the data value of 0x4020 address of some packs are different from the most other packs.  So they want to know if this is a problem they should worry about, if this value doesn't matter,

    they will abandon the Data Flash checking of 0x4020 and maybe skip checking other undefind address in the TRM. Could you kindly help to give some advice? Thanks a lot.

  • 0 in reply to Bruce li
    TI__Genius 10370 points
    Bruce,

    Can you go in more detail about the procedure that is being done? are they programming a golden image into the devices or are they programming the stock default image?
  • 0 in reply to Vos
    Genius 5580 points
    Dear Eric,
    They've programmed a golden image into the devices. In the manufacture, they used Nebula BMS system (http://www.e-nebula.com/) to employ all the process include calibration/programming/function testing. During the last few steps, it will read all data flash content and compare. They are not sure they should just have to compare the limited address define in data flash table in TRM or they should compare all the address of data flash from 0x4000~0x5000?
  • 0 in reply to Bruce li
    TI__Genius 10370 points

    Bruce,

    I am digging further into this. Can you give specifics on the address and values being changed? 

    Thanks,

    E. Vos

  • 0 in reply to Vos
    Genius 5580 points
    Dear Eric,
    Thanks a lot for your support. Below is the dataflash value read form 0x4020:
    2040 FFFF FFFF 0000 FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF----- for most BQ27750 packs
    2040 FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF----- for 100pcs+ BQ27750 packs
  • 0 in reply to Bruce li
    Genius 5580 points
    Dear Eric,
    Sorry, should be below order:
    2040 FFFF FFFF 0000 FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF----- for 100pcs+ BQ27750 packs
    2040 FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF----- for most BQ27750 packs
  • 0 in reply to Vos
    Genius 5580 points
    Dear Eric,
    Any update for this case? There is only 4 bits FFFF changed to 0000, could you kindly help to check the meaning for these 4 bits? Thanks a lot.
  • 0 in reply to Bruce li
    TI__Genius 10370 points

    Bruce,

    This should not cause an error and can be ignored. That is an unused portion of the data memory. i will message you privately if you could send me your golden file to check on my end as well. 

    Thanks,
    Eric Vos