BQ24192 datasheet(21/53 Pages) TI2

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VREF

COLD

HOT

LTF

TCO

VREF

HOT

COLD

TCO

LTF

VREF

LTF

COLD

RTH

RT2

RTH

RT1

RT2

RTH

bq24190, bq24192, bq24192I

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SLUSAW5B – JANUARY 2012 – REVISED DECEMBER 2014

(2)

Select 0°C to 45°C range for Li-ion or Li-polymer battery,

RTHCOLD = 27.28 kΩ

RTHHOT = 4.911 kΩ

RT1 = 5.52 k

RT2 = 31.23 k

9.3.3.5 Charging Termination

The bq24190, bq24192, bq24192I terminates a charge cycle when the battery voltage is above recharge

threshold, and the current is below termination current. After the charging cycle is complete, the BATFET turns

off. The converter keeps running to power the system, and BATFET can turn back on to engage supplement

mode.

When termination occurs, the status register REG08[5:4] is 11, and an INT is asserted to the host. Termination is

temporarily disabled if the charger device is in input current/voltage regulation or thermal regulation. Termination

can be disabled by writing 0 to REG05[7].

9.3.3.5.1

Termination when REG02[0] = 1

When REG02[0] is HIGH to reduce the charging current by 80%, the charging current could be less than the

termination current. The charger device termination function should be disabled. When the battery is charged to

fully capacity, the host disables charging through CE pin or REG01[5:4].

9.3.3.5.2

Termination when REG05[6] = 1

Usually the STAT bit indicates charging complete when the charging current falls below termination threshold.

Write REG05[6] = 1 to enable an early “charge done” indication on STAT pin. The STAT pin goes high when the

charge current reduces below 800 mA. The charging cycle is still on-going until the current falls below the

termination threshold.

9.3.3.6 Charging Safety Timer

The bq24190, bq24192, bq24192I has safety timer to prevent extended charging cycle due to abnormal battery

conditions.

In default mode, the device keeps charging the battery with 5-hour fast charging safety timer regardless of

REG05[2:1] default value. At the end of the 5 hours, the EN_HIZ (REG00[7]) is set to signal the buck converter

stops and the system load is supplied by the battery. The EN_HIZ bit can be cleared to restart the buck

converter.

In host mode, the device keeps charging the battery until the fast charging safety timer expired. The duration of

safety timer can be set by the REG05[2:1] bits (default = 8 hours). At the end of safety timer, the EN_HIZ

(REG00[7]) is cleared to signal the buck converter continues to operation to supply system load.

The safety timer is 1 hour when the battery is below BATLOWV threshold. The user can program fast charge

safety timer through I2C (REG05[2:1]). When safety timer expires, the fault register REG09[5:4] goes 11 and an

INT is asserted to the host. The safety timer feature can be disabled via I2C (REG05[3]).

The following actions restart the safety timer:

•

At the beginning of a new charging cycle

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Product Folder Links: bq24190 bq24192 bq24192I

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