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BQ25892: Battery not charging using Charger IC

VENKATAPPA SACHIN
Intellectual 350 points
Part Number: BQ25892

Hi,

Battery not charging using BQ25892 Charger IC.

Connect NonPD TypeC (5v/3A) charger to DUT
Issue -> Charging not happening. Battery % is dipping. But Charging_Status (STAT) LED is glowing.

Below is the register dump.

ChargerRegister-0x0 = 0x1c
ChargerRegister-0x1 = 0x6
ChargerRegister-0x2 = 0x1c
ChargerRegister-0x3 = 0x1a
ChargerRegister-0x4 = 0x3f
ChargerRegister-0x5 = 0x13
ChargerRegister-0x6 = 0x7e
ChargerRegister-0x7 = 0x8d
ChargerRegister-0x8 = 0x3
ChargerRegister-0x9 = 0x44
ChargerRegister-0xa = 0x73
ChargerRegister-0xb = 0x16
ChargerRegister-0xc = 0x0
ChargerRegister-0xd = 0xad
ChargerRegister-0xe = 0x0
ChargerRegister-0xf = 0x0
ChargerRegister-0x10 = 0x0
ChargerRegister-0x11 = 0x94
ChargerRegister-0x12 = 0x0
ChargerRegister-0x13 = 0x9c
ChargerRegister-0x14 = 0x5

  • 0
    TI__Guru**** 166246 points
    Venkatappa,

    REG13 bit 7 is reporting VINDPM. The ADC reports VBUS=4.6V in REG11 but forced VINDPM threshold is 7.10V per REG0D. What is the output current rating of your power source? Based on your IINDPM setting in REG00, it should be at least 1.5A. Also, the ADC readings for BAT and SYS pin voltages in REG0E and REG0F are 2.304V, which means either a depleted battery or no battery is connected.
  • 0 in reply to Jeff F
    Intellectual 350 points

    The Power source rating is 5V/3A. Yes, connected a depleted battery to the system.

  • 0 in reply to VENKATAPPA SACHIN
    TI__Guru**** 166246 points
    Based on the ADC registers, the voltage at VBUS is not 5V and the VINDPM setting is forced to 7V. VINDPM must be set lower than the applied voltage at VBUS in order for current to initially flow. If the charger attempts to pull too much current from the power source, the VINDPM turns on and reduces input current so that VBUS sits slightly above VINDPM setting.