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BQ25896 battery charger configuration

yitzhak yanuka
Prodigy 30 points
Other Parts Discussed in Thread: BQ25896

What is the host configuration  commands that defines  BQ25896 in five states:

one:  1A charing(vin=5v) while vout=0

two:  system power on

  •    battery only vout ~ 4v 3A
  •    vin=5v 3A   vout ~ 4v 3A with out battery
  •    vin=5v 1A to 3A  vout ~ 4v 3A with battery (system power on while  charging(1A))

three: power down:

  • battery only vout=0
  • vin=5v with battery vout=0
  • vin=5v witout battery vout=0
  • 0
    TI__Guru**** 165986 points

    Without host communication, the default charge current is 2A and the default charge voltage on BAT pin is 4.2V, with SYS voltage being slightly higher.  SYS will never drop lower than MINSYS voltage (~3.5V).  The default input current limit is set to 500mA if PSEL pin is high or set by the resistor on the ILIM pin if PSEL pin is low.  The VINDPM threshold is also auto-detected.  Once the host is able to communicate, you can write to the various I2C registers to change the default values.  For example, to change the BAT regulation voltage to 4V, you write to REG06, bits 1-7.  The IC does not have a processor, only an integrated state machine that uses the I2C registers for its limits.