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BQ25892: How to use 5A fast charge current for battery in standalone mode ?

John KG
Prodigy 100 points
Part Number: BQ25892
Other Parts Discussed in Thread: BQ25890,

1. The ILIM resistor can be used to set the input current limit for BQ25890/25892. If PSEL is pulled low for BQ25892, will the register setting IINLIM be set as 3.25A by default ? And will this enable whatever the ILIM resistor is used, to control the input current limit ?

2. How to use BQ25892 as 5A charger in standalone mode as the default ICHG is set as 2048mA ? Will writing 5A into the register once, enable it to be used as 5A charger even if the battery is removed and inserted back again ?

  • 0
    TI__Guru 57541 points
    1. When PSEL is low, the default IINLIM is 3.25A. The actual input current limit is the lower limit set by ILIM pin (when EN_ILIM bit is high) or IIINLIM register bits
    2. When an adaptor is plugged in, the device will run input current limit detection automatically and update REG00[5:0]. After the input current limit detection is complete, the host may change IINLIM to 5A. Then disable watchdog timber by setting WATCHDOG bits=00. To avoid IINLIM gets reset when re-plugging adaptor, it is also recommended to set AUTO_DPDM_EN disabled, i.e. REG02[0]=0. Please note that re-plugging in battery will not impact on IINLIM.
    Thanks!
  • 0 in reply to Ning T
    Prodigy 100 points

    Can you please tell me if the ICHG (the charge current for fast charge current for battery) set to 2048mA by default, if modified using I2C to 5A, be changed back to default value if we unplug the battery ?

    Thank you for the IINLIM concepts :)

  • 0 in reply to John KG
    TI__Guru 57541 points
    Assuming watchdog timer does not expire or is disabled, ICHG setting should not be reset even if the battery is unplugged. All the register values will be lost if the device is powered down. Thanks!