Datasheet

bq24195

bq24195L

www.ti.com

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 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

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.

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

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 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

Product Folder Links: bq24195 bq24195L