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[BQ34Z100PW] Remove Battery after IT Enable&Seal

paik nam woong
Prodigy 120 points
Other Parts Discussed in Thread: BQ34Z100

1. run optimize cycle ->  check Qmax updated, R table updated, Update status:06

2. change *.gg file.. -> Update Status=02, cycle count =0.

3. Connect BQ34Z100 to Battery -> Sellect Cell ID -> Write *.gg -> Calibration -> IT Enable(Send 0x0021) -> Seal(Send 0x0020)

in this condition... status bits FAS, SS, VOK, QEN is set

4. remove battery from BQ34Z100 and reconnect battery to BQ34Z100.

Status bit RUP_DIS is set, and VOK is Cleared, QEN is Set.

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"RUP_DIS=set" in product condition... is it right??

or never remove battery from BQ34Z100 after IT Enable???

if i remove battery from BQ34Z100. need to send 0x0021 when i reconnect battery to BQ34Z100??

  • 0
    Genius 3970 points

    Yes, that behavior when you reconnect power is expected. Upon a power-on reset or reconnecting the battery, RUP_DIS will be set and VOK will be cleared. This is because the fuel gauge is not yet sure if the battery is in a relaxed state, so it keeps resistance updates disabled until it is confident in taking an open-circuit voltage (OCV) measurement.


    The bq34z100 is a pack-side fuel gauge (the battery generally remains hooked up to the battery permanently). That said, if you are sure the battery has relaxed (not charged or discharged for a while) you can try sending IT_ENABLE (0x0021) to enable resistance updates and Qmax updates (RUP_DIS cleared and VOK set). Just remember that if you've sealed the pack, you will need to send the Unseal Key first before sending IT_ENABLE because the gauge will re-seal itself (FAS and SS set) if the fuel gauge is reset.