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Original question:

BQ40Z50-R2: Charge Provided to the battery / Total time that battery in fast charge mode.

BQ40Z50-R2: RSOC Ceiling Function clarification

Chandann27
Prodigy 180 points
Part Number: BQ40Z50-R2

Clarification on RSOC Ceiling Function:

RSOC_RND_OFF Bit is 0 in SBS configuration register. SBS Configuration value 07.

RSOCL bit in SBS Gauging Configuration register is enabled, so RSOC is held at 99% till a valid charge termination is occurred. Here Ceiling function will not work though the RSOC is at lets say, 99.5% RSOC shown will be 99%.

Once after it reaches 100% upon VCT and charging is stopped, how RSOC will be displayed ? Does it change to 99% only after actual RSOC is less than 99% (98.1 to 98.9) ? or does it display 99% for 99.1% to 99.9% ?

Please clarify the ceiling function in discharge mode .

Thanks,

Chandan N

  • 0
    TI__Guru** 105590 points

    Hello Chandann,

    The RSOC will remain at 99% until FC bit is set using these two bits. It will round 98% values to 99%, it is only when it's in the last 1% it will prevent showing 100% until full charge.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Prodigy 180 points

    Hello Wyatt Keller,

    Thanks for the reply.

    Yes FG will prevent showing 100% until full charge, thanks for clarification.

    Statement from Ref. Manual - Clause 6.11:

    " Round-down applies for charging and discharging between an RSOC of 99% to 99.9%

    if: There is an RSOC of 99.1 or 99.9, then the RSOC becomes 99 (round down) "

    Question:

    Does this round down feature works if RSOC_RND_OFF Bit is 0 in SBS configuration register ? or in other words is it the same behavior by default (ceiling function)? 

    Am more interested in understanding the behavior in discharge of the first 1% RSOC (100% to 99%)

    Thanks,

    Chandan N

  • 0 in reply to Chandann27
    TI__Guru** 105590 points

    Hello Chandan,

    The RSOC will remain at 99% until FC is set regardless of the rounding function if RSOCL is set.

    During discharge it will decrease to 99% at the start of discharge due to the rounding function.

    Sincerely,

    Wyatt Keller