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BQ27220: BQ27220 H/W Issue

James Su5
Expert 1340 points
Part Number: BQ27220
Other Parts Discussed in Thread: BQ24610,

  This is Hung and please help me to solve my HW issue.

                        In my schematic, I use BQ24610 and BQ27220 in the same time.

                        BQ24610 is to charge battery and switch the system power source which supplied from adapter or battery.

                        Because OS need to know how much battery power capacity remained, so I use BQ27220 to let SOC/CPU know such battery power capacity information by I2C bus.

                        However, BQ24610 behavior is wrong, it cannot switch power source and cannot charge my battery.

                        After do remove BQ27220 related schematic experiment, BQ24610 behavior is normal, it can switch power source and charge my battery.

                        Above is my encountered problem so far, the bellowing picture is my power delivery and attached file are BQ27220(P37-BATT RECORDER.PDF) and BQ24610(P25 – SYSTEM_PWR.PDF) schematic.

                        Please help to bellowing items

  1. Is the BQ27220 schematic correct?
  2. In the bellowing power delivery, Is BQ27220 suitable??
  3. Can BQ27220 and BQ24610 use in the same time??

Or any suggestion/experiment about this problem.

Please help advise this.P37 - BATT_RECORDER.PDFP25 - SYSTEM_PWR.PDF

  • 0
    TI__Guru* 76230 points
    Hi Hung,
    This seems to be more of a charger issue than a gauge issue. I perused over the gauge schematic and it seems ok. I suggest you post this question to the charger forum so some one from that team can review your schematic.

    thanks
    Onyx
  • 0 in reply to Onyx Ahiakwo
    Prodigy 75 points
    Hi Onyx,
    I also posted to charger forum and charge IC BQ24610 related schematic is ok which replied by TI_Jing Zou
    Please refer to attached file P25 - SYSTEM_PWR.PDF which have been uploaded and may I have some questions

    Scenario I : both of adapter and battery are connect with my DUT. At this time, system power(SYS_PWR) is supplied by adapter(GEN_5V) and charge battery(VBATT)

    Scenario II : Just only adapter connect to my DUT. At this time, system power(SYS_PWR) is supplied by adapter(GEN_5V)

    Scenario III : Just only battery connect to my DUT. At this time, system power(SYS_PWR) is supplied by battery(VBATT)

    According to BQ27220 spec, SRP is connect to battery(VBATT) and it seems that my connection is correct
    However, as I mentioned above three scenarios, which spec defined VSYS should I connect with??
    So far, SRN is connect with SYS_PWR in my schematic. Is it correct??
    What is definition of VSYS??
    Can BQ27220 and BQ24610 use in the same time??

    Please help to clarify

    BTW, can you provide your E-mail so that I can provide board file to you and please also help me to review board file

    Thanks & Regards
    Hung
  • 0 in reply to Hung Tsai
    TI__Guru* 76230 points

    Hi Hung,

    Vsys which is the point your board connects to the system should be connected to SRN like we have in the reference schematic in our evm user guide. So i believe what you have is correct.

    thanks

    Onyx