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BQ25792: OVP_STAT

Inon Yagolnizer
Prodigy 10 points
Part Number: BQ25792
Other Parts Discussed in Thread: TPS25750,

Hi

using the BQ25792 device without the TPS25750.

when i'm trying to charge after a few seconds the VBAT_OVP_STAT bit in register 20H and VSYS_OVP_STAT bit in register 21H are set to '1'.

in this state, the battery is being discharged.

nothing i'v done or wrote to the registers helped accept changing the VINDPM_7:0 value to higher value then should be.

at that state, there is no charge or discharge from the battery.

Thanks

Inon

  • 0
    TI__Mastermind 29985 points

    Hello Inon,

    Please capture a full register sweep with the ADC Enabled. Pay attention to the applied battery voltage and the REG01 Charge Voltage Limit.

    Regards,

    Mike Emanuel

  • 0
    Prodigy 10 points

    Hi Michael

    here are the register values;

    Register Value
    0x00 0x12
    0x01 0x03
    0x02 0x48
    0x03 0x00
    0x04 0xc8
    0x05 0x2b
    0x06 0x00
    0x07 0x84
    0x08 0xc3
    0x09 0x05
    0x0a 0x63
    0x0b 0x00
    0x0c 0xdc
    0x0d 0x4b
    0x0e 0x3d
    0x0f 0xa2
    0x10 0x00
    0x11 0x40
    0x12 0x00
    0x13 0x01
    0x14 0x16
    0x15 0xaa
    0x16 0xc0
    0x17 0x7a
    0x18 0x55
    0x19 0x00
    0x1a 0x84
    0x1b 0x0f
    0x1c 0x0a
    0x1d 0x01
    0x1e 0x00
    0x1f 0x00
    0x20 0x20
    0x21 0x00
    0x22 0xef
    0x23 0x92
    0x24 0x40
    0x25 0x00
    0x26 0x20
    0x27 0x40
    0x28 0x00
    0x29 0x00
    0x2a 0x00
    0x2b 0x00
    0x2c 0x00
    0x2d 0x00
    0x2e 0xb8
    0x2f 0xfe
    0x30 0xf0
    0x31 0x00
    0x32 0x0f
    0x33 0x00
    0x34 0x00
    0x35 0x13
    0x36 0xbe
    0x37 0x13
    0x38 0x5c
    0x39 0x13
    0x3a 0x62
    0x3b 0x1e
    0x3c 0x4a
    0x3d 0x00
    0x3e 0x00
    0x3f 0x00
    0x40 0x00
    0x41 0x00
    0x42 0x00
    0x43 0x00
    0x44 0x00
    0x45 0x00
    0x46 0x00
    0x47 0x00
    0x48 0x08

    Thanks

    Inon

  • 0 in reply to Michael Emanuel35
    Prodigy 10 points

    Hi Michael

    here are the register values;

    Register Value
    0x00 0x12
    0x01 0x03
    0x02 0x48
    0x03 0x00
    0x04 0xc8
    0x05 0x2b
    0x06 0x00
    0x07 0x84
    0x08 0xc3
    0x09 0x05
    0x0a 0x63
    0x0b 0x00
    0x0c 0xdc
    0x0d 0x4b
    0x0e 0x3d
    0x0f 0xa2
    0x10 0x00
    0x11 0x40
    0x12 0x00
    0x13 0x01
    0x14 0x16
    0x15 0xaa
    0x16 0xc0
    0x17 0x7a
    0x18 0x55
    0x19 0x00
    0x1a 0x84
    0x1b 0x0f
    0x1c 0x0a
    0x1d 0x01
    0x1e 0x00
    0x1f 0x00
    0x20 0x20
    0x21 0x00
    0x22 0xef
    0x23 0x92
    0x24 0x40
    0x25 0x00
    0x26 0x20
    0x27 0x40
    0x28 0x00
    0x29 0x00
    0x2a 0x00
    0x2b 0x00
    0x2c 0x00
    0x2d 0x00
    0x2e 0xb8
    0x2f 0xfe
    0x30 0xf0
    0x31 0x00
    0x32 0x0f
    0x33 0x00
    0x34 0x00
    0x35 0x13
    0x36 0xbe
    0x37 0x13
    0x38 0x5c
    0x39 0x13
    0x3a 0x62
    0x3b 0x1e
    0x3c 0x4a
    0x3d 0x00
    0x3e 0x00
    0x3f 0x00
    0x40 0x00
    0x41 0x00
    0x42 0x00
    0x43 0x00
    0x44 0x00
    0x45 0x00
    0x46 0x00
    0x47 0x00
    0x48 0x08

    Thanks

    Inon

  • 0 in reply to Inon Yagolnizer
    TI__Mastermind 29985 points

    Hello Inon,

    Can you also provide a schematic and how you are not using the TPS25750 but using the BQ25792 only?

    Regards,

    Mike Emanuel

  • 0 in reply to Michael Emanuel35
    Prodigy 10 points

    Hi Mike

    here is the design for the BQ25792.

    the I2C is connected to a CPLD able to read and write.

    Inon

  • 0 in reply to Inon Yagolnizer
    TI__Mastermind 19195 points

    Hi Inon,

    Based on the provided register dump, I see that the VBAT OVP (REG20) is triggered but the ADC VBAT reading (REG3B: 7754mV) is lower than the charge voltage setting (REG01: 8400mV).

    When we saw this kind of problem in the past it was likely due to damaged BAT/BATP pin. Can you test again with a new chip?

    Remember to enable the ShipFET functionality in REG14 as you have ShipFET present in your schematic.

    Regards

  • 0 in reply to Tommy Lin
    Prodigy 10 points

    Hi Tommy

    i found out that i'm writing to the BQ to soon after the power go up.

    i'v added a sleep of 10sec before configuration of the BQ and it helped.

    now the device is charging to full battery voltage with no problem.

    tnx

    Inon