Datasheet
bq24190, bq24192
bq24192I, bq24193
SLUSAW5A –JANUARY 2012–REVISED OCTOBER 2012
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Autonomous Charging Cycle
With battery charging enabled at POR (REG01[5:4]=01), the bq24190, bq24192, bq24192I, bq24193 can
complete a charging cycle without host involvement. The device default charging parameters are listed in
Table 4.
Table 4. Charging Parameter Default Setting
DEFAULT MODE bq24190, bq24192 bq24192I bq24193
Charging Voltage 4.208 V 4.112 V 4.208 V
Charging Current 2.036 A 1.012 A 2.036 A
Pre-charge Current 256 mA 256 mA 256 mA
Termination Current 256 mA 256 mA 256 mA
Temperature Profile Hot/Cold Hot/Cold JEITA
Safety Timer 8 hours
(1)
8 hours
(1)
8 hours
(1)
(1) See section Charging Safety Timer for more information.
A new charge cycle starts when the following conditions are valid:
• Converter starts
• Battery charging is enabled by I
2
C register bit (REG01[5:4]) = 01 and CE is low
• No thermistor fault on TS1 and TS2
• No safety timer fault
• BATFET is not forced to turn off (REG07[5])
The charger device automatically terminates the charging cycle when the charging current is below termination
threshold and charge voltage is above recharge threshold. When a full battery voltage is discharged below
recharge threshold (REG04[0]), the bq24190, bq24192, bq24192I, bq24193 automatically starts another charging
cycle.
The STAT output indicates the charging status of charging (LOW), charging complete or charge disable (HIGH)
or charging fault (Blinking). The status register REG08[5:4] indicates the different charging phases: 00-charging
disable, 01-precharge, 10-fast charge (constant current) and constant voltage mode, 11-charging done. Once a
charging cycle is complete, an INT is asserted to notify the host.
The host can always control the charging operation and optimize the charging parameters by writing to the
registers through I
2
C.
Battery Charging Profile
The device charges the battery in three phases: preconditioning, constant current and constant voltage. At the
beginning of a charging cycle, the device checks the battery voltage and applies current.
Table 5. Charging Current Setting
VBAT CHARGING CURRENT REG DEFAULT SETTING REG08[5:4]
<2V 100mA – 01
2V-3V REG03[7:4] 256mA 01
>3V REG02[7:2] 2048mA (bq24190/192/193) 1024mA (bq24192I) 10
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Product Folder Links: bq24190 bq24192 bq24192I bq24193