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Original question:

BQ25720: BQ25720: BQ40Z50

BQ25720: BQ25720

Harini S
Prodigy 90 points

Part Number: BQ25720
Other Parts Discussed in Thread: TIGER

Hi Tiger,

When the Type-C adapter is connected to our custom board, the system boots normally and the power-up sequence completes as expected. However, when only the battery is connected, although the battery charger output and VSYS are present and stable, the power sequence does not progress.

In this scenario, the CHG_PROCHOT# signal remains low. In contrast, when the adapter is connected and the power button is pressed, CHG_PROCHOT# transitions high, which allows the power sequence to continue.  

Kindly help us resolve this issue.

  • 0
    TI__Mastermind 37375 points

    Hi, Harini,

    Maybe you should disable low power mode. Set EN_LWPWR=0 in ChargeOption0 register. 

    Regards,

    Tiger

  • 0 in reply to Tiger Zhou
    Prodigy 90 points

    Hi Tiger,
    The issue still exists. Our battery charger IC is holding PROCHOT# low.
    When only the adapter is connected, the power sequence works properly.

    When only the battery is connected, the power sequence does not start.
    Even when both the Adapter and battery are connected together, the power sequence is still not happening because PROCHOT# remains low. 

  • 0 in reply to Harini S
    TI__Mastermind 37375 points

    Hi, Harini,

    Could you share the register dump? 

    Regards,

    Tiger

  • 0 in reply to Tiger Zhou
    Prodigy 90 points

    Hi Tiger,

    Kindly find the register dump below.

    REGISTER VALUE
    ChargeOption0() 0x070E
    ChargeCurrent() 0x0800
    ChargeVoltage() 0x3460
    ChargerStatus() 0x00C0
    ProchotStatus() 0x00E0
    ChargeOption1() 0x3B00
    ChargeOption2() 0x1037
    ProchotOption0() 0x4A81
    ProchotOption1() 0x41A0
    ChargeOption4() 0x0048
    Vmin Active Protection() 0x006C
    VSYS_MIN() 0x5A00
    IIN_HOST() 0x4100
  • 0 in reply to Harini S
    TI__Mastermind 37375 points

    HI, Harini,

    There are a few error codes in the ChargerStatus() and ProchotStatus(). You will need to fix that. 

    My suggestion is to start with the default register settings and work on your modifications one by one.

    Fullscreen 4061.20V-DEFAULT-SETTINGS.txt Download 
    * Created: Tue May 11 15:06:13 CDT 2021
*
* Format: Register Name  tab Character,\t  Hexadecimal register value.
* Device: bq25720
* BQZ Container: Charger_1_00-bq25720.bqz
*
Charge Option 0	E70E
Charge Current	0000
Max Charge Voltage	20D0
OTG Voltage	09C4
OTG Current	3C00
Input Voltage	0000
Min System Voltage	4200
IIN_HOST	4100
Charger Status	8000
Prochot Status	B800
IIN_DPM	4100
ADC VBUS and PSYS	CF00
ADC IBAT	0000
ADC IIN and CMPIN	0000
ADC VSYS and VBAT	0000
Manufacture ID	0040
Device ID	00E1
Charge Option 1	3300
Charge Option 2	00B7
Charge Option 3	0434
Prochot Option 0	4A81
Prochot Option 1	41A0
ADC Option	2000
Charge Option 4	0048
Vmin Active Protection	006C

    Regards,

    Tiger