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BQ25890H: Device enter the ship mode, when VBAT 2.6V -2.7V, plug in the adapter, device can't charge.

Lillian Liu(SH)
Expert 3880 points
Part Number: BQ25890H

Hi team,

Now I met an issue in BQ25890H, which need your help. All test have remove PCM and slave charger.

Issue background:

Scene1：Firstly give VBAT voltage(about 3.9V) to start the phone, and set BATFET_DIS bit to make device enter the ship mode. Then shut down the phone, when VBAT 2.6V -2.7V, plug in the adapter, device can't charge-- Ibat≈0 and VSYS shake; The most strange is BC1.2 detection fail show as below.  In addition, If VBAT>2.7V or VBAT<2.6V, device can charge.

Scene2：Give VBAT voltage(about 3.9V) to start the phone, and clear BATFET_DIS bit register to make device exit the ship mode. Then shut down the phone, when VBAT 2.6V -2.7V,  plug in the adapter, device can charge. And BC1.2 detection success for twice but fail other times show as below.

bq2589x_dump_regs:[0x00,0x40][0x01,0x01][0x02,0xd0][0x03,0x08][0x04,0x0e][0x05,0x32][0x06,0x96][0x07,0x0d][0x08,0x03][0x09,0x40][0x0a,0x82][0x0b,0x02][0x0c,0x00][0x0d,0x90][0x0e,0x44][0x0f,0x45][0x10,0x48][0x11,0x00][0x12,0x00][0x13,0x00][0x14,0x1f]

In this issue, what confuse me most is why ship mode influence the charging? and why plug in adapter BC1.2 detection fails.(I have checked the adapter is normal)

In which condition, BC1.2 detection will fail?  Do you have any comments on this issue? I look forward your reply!

Thanks

Best regards

Lillian Liu

  • 0
    TI__Mastermind 19310 points

    Hi Lillian,

    After looking at the register readings you sent, I see that auto-detection is disabled (REG02[0] = 0b) and charging is also disabled (REG03[4] = 0b).

    When you are testing with a low battery voltage (VBAT is 2.6V - 2.7V) and you plug in the adapter, do you have auto-detection and charging enabled?

    I also see that the device is showing "No Input".  

    Regards,

    James