Texas Instruments BQ2419X I²C Controlled 4.5A Single Cell USB / Adaptor Charger Evaluation Module BQ24195LEVM-193 BQ24195LEVM-193 Datenbogen
Produktcode
BQ24195LEVM-193
SLUSB97 – OCTOBER 2012
Table 3. Charging Parameter Default Setting
DEFAULT MODE
bq24195L, bq24195
Charging Voltage
4.208 V
Charging Current
2.036 A
Pre-charge Current
256 mA
Termination Current
256 mA
Temperature Profile
Hot/Cold
Safety Timer
8 hours
(1)
(1)
See section
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 bq24195L, bq24195 automatically starts another charging cycle.
threshold and charge voltage is above recharge threshold. When a full battery voltage is discharged below
recharge threshold (REG04[0]), the bq24195L, bq24195 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.
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
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.
beginning of a charging cycle, the device checks the battery voltage and applies current.
Table 4. 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
10
Copyright © 2012, Texas Instruments Incorporated
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