BQ24196_17 Datasheet, PDF (18/50 Pages) Texas Instruments – I2C Controlled 2.5-A Single Cell USB/Adapter Charger with Narrow VDC Power Path Management and USB OTG

bq24196
SLUSB98A – OCTOBER 2012 – REVISED DECEMBER 2014
www.ti.com
The host can always control the charging operation and optimize the charging parameters by writing to the
registers through I²C.
8.3.3.2 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.
VBAT
<2V
2V-3V
>3V
Table 4. Charging Current Setting
CHARGING CURRENT
100 mA
REG03[7:4]
REG02[7:2]
REG DEFAULT SETTING
–
256 mA
2048 mA
REG08[5:4]
01
01
10
If the charger device is in DPM regulation or thermal regulation during charging, the actual charging current will
be less than the programmed value. In this case, termination is temporarily disabled and the charging safety
timer is counted at half the clock rate.
Regulation Voltage
(3.5V – 4.4V)
Fast Charge Current
(500mA-4020mA)
VBAT_LOWV (2.8V/3V)
Battery Voltage
Charge Current
VBAT_SHORT (2V)
IPRECHARGE (128mA-2048mA)
ITERMINATION (128mA-2048mA)
IBATSHORT (100mA)
Trickle Charge Pre-charge
Fast Charge and Voltage Regulation
Figure 13. Battery Charging Profile
Safety Timer
Expiration
8.3.3.3 Thermistor Cold/Hot Temperature Window
The bq24196 continuously monitors battery temperature by measuring the voltage between the TS pins and
ground, typically determined by a negative temperature coefficient thermistor and an external voltage divider. The
device compares this voltage against its internal thresholds to determine if charging is allowed. To initiate a
charge cycle, the battery temperature must be within the V_LTF to V_HTF thresholds. During the charge cycle the
battery temperature must be within the V_LTF to V_TCO thresholds, else the device suspends charging and waits
until the battery temperature is within the V_LTF to V_HTF range.
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