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BQ27545-G1: Power management forum

Hitoshi Okuma
Prodigy 140 points
Part Number: BQ27545-G1
Other Parts Discussed in Thread: BQ27532-G1,

Tool/software:

Hi, TI Team.

What is the significance of turning on the [RMFCC] flag in DF?

Some fuel gauges have the [RMFCC] flag.

e.g.
bq27532-g1: Configuration:Registers:Op Config[RMFCC]
bq27545-g1: Configuration:Registers:Pack Configuration[RMFCC]

When this flag is ON, RM=FCC will be performed when a valid charge is completed.

Please introduce me to a document that explains in detail how this benefits the operation, remaining capacity, and lifespan of the battery pack.

Regards,
Hitoshi

  • 0
    TI__Genius 11786 points

    Hello Hitoshi, 

    Please see the following taken from the bq27545-G1 TRM. 

    Regards, 

    Jonny. 

  • 0 in reply to Jonny
    Prodigy 140 points

    Hello, Jonny,

    Thanks for replying.
    I have already checked TRM 6.5.1.
    This is the explanation of the condition of charging termination and RM=FCC, right?
    What I want to know is the intention of RM=FCC.
    Please introduce me to a document that explains in detail how this benefits the operation, remaining capacity, and lifespan of the battery pack.

    Regards,
    Hitoshi

  • 0 in reply to Hitoshi Okuma
    TI__Genius 17181 points

    Hello Hitoshi,

    We don't have a document that specifically address your questions. However, I can provide this document that talks about impedance track: https://www.ti.com/lit/an/slua364b/slua364b.pdf

    Regards,

    Nick Richards

  • 0 in reply to Nick Richards
    Prodigy 140 points

    Hello, Nick.

    Thank you for sharing the Impedance-track documentation.

    It's a shame.

    Only some ICs use the DF flag to control RM=FCC when charging is complete. Not all ICs with Impedance Track algorithms are applicable.

    Even if there are ICs with the same Impedance Track algorithm, there are some that do not have the DF flag, right?

    It would have been nice if you had explained the reason for having the DF flag and the differences (Prof/Cons) from other ICs.

    I think the document would be even more useful if you included the background, reasons, and advantages of doing so in addition to explaining the settings and operation.

    I hope you will use this as a reference for future information disclosure.

    Regards,
    Hitoshi