BQ25882 datasheet(24/86 Pages) TI2

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Regulation Voltage

VREG[7:0]

Charge Current

ICHG[5:0]

VBATLOWV

VBAT_SHORT

IPRECHG[3:0]

ITERM[3:0]

IBAT_SHORT

Battery Voltage

Charge Current

Trickle Charge

Pre-charge

Fast-Charge

Top-off Timer

(optional)

CHRG_STAT[2:0]

001

010

011

101

Taper-Charge

100

110

Precharge Timer

(2hrs)

Safety Timer

CHG_TIMER[1:0]

BQ25883

SLUSDL3A – FEBRUARY 2019 – REVISED APRIL 2019

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Table 6. Default Charging Current Setting (continued)

VBAT

CHARGING CURRENT

CHRG_STAT

> VBAT_LOWV

ICHG

1500 mA

011

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, as explained in the Charging Safety Timer section.

Figure 19. Battery Charging Profile

8.3.7.3 Charging Termination

The device terminates a charge cycle when the battery voltage is above recharge threshold, and the current is

below termination current. After the charging cycle is completed, the BATFET turns off. The converter keeps

running to power the system, and BATFET can turn on again to engage Supplement Mode.

When termination occurs, the STAT pin goes HIGH (charge current will continue to taper if top-off timer is

enabled), status register CHRG_STAT is set to 110, and an INT pulse is asserted to the host. Termination is

temporarily disabled when the charger device is in input current, voltage or thermal regulation. Termination can

be permanently disabled by writing 0 to EN_TERM bit prior to charge termination.

At low termination currents (50mA-100mA), due to the comparator offset, the actual termination current may be

up to 20% higher than the termination target. In order to compensate for comparator offset, a programmable top-

off timer (default disabled) can be applied after termination is detected.The top-off timer will follow safety timer

constraints, such that if safety timer is suspended, so will the top-off timer. Similarly, if safety timer is doubled, so

will the top-off timer. CHRG_STAT reports whether the top off timer is active via the 101 code. Once the Top-Off

timer expires, the CHRG_STAT register is set to 110 and an INT pulse is asserted to the host.

Top-off timer gets reset (set to 0 and counting resumes when appropriate) for any of the following conditions:

BQ25882 Datasheet(PDF) 24 Page - Texas Instruments

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