BQ24100_10 Datasheet, PDF(19/40 Page) Texas Instruments – SYNCHRONOUS SWITCHMODE, LI-ION AND LI-POLYMER CHARGE-MANAGEMENT IC WITH INTEGRATED POWER FETs ( bqSWITCHER™)

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BQ24100_10 Datasheet, PDF (19/40 Pages) Texas Instruments – SYNCHRONOUS SWITCHMODE, LI-ION AND LI-POLYMER CHARGE-MANAGEMENT IC WITH INTEGRATED POWER FETs ( bqSWITCHER™)

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bq24100, bq24103, bq24103A

bq24104, bq24105, bq24108, bq24109

bq24113, bq24113A, bq24115

SLUS606O â JUNE 2004 â REVISED MARCH 2010

Battery Detection

For applications with removable battery packs, bqSWITCHER provides a battery absent detection scheme to

reliably detect insertion and/or removal of battery packs.

POR or VRCH

Yes

Detection routine runs on power up

and if VBAT drops below refresh

threshold due to removing battery

or discharging battery.

Enable

I(DETECT)

for t(DETECT)

VI(BAT)<V(LOWV)

Yes

Apply I(WAKE)

for t(WAKE)

BATTERY

PRESENT,

Begin Charge

VI(BAT) >

VO(REG)

-VRCH

Yes

BATTERY

ABSENT

BATTERY

PRESENT,

Begin Charge

Figure 11. Battery Absent Detection for bq2410x ICs only

The voltage at the BAT pin is held above the battery recharge threshold, VOREG â VRCH, by the charged battery

following fast charging. When the voltage at the BAT pin falls to the recharge threshold, either by a load on the

battery or due to battery removal, the bqSWITCHER begins a battery absent detection test. This test involves

enabling a detection current, IDISCHARGE1, for a period of tDISCHARGE1 and checking to see if the battery voltage is

below the short circuit threshold, VSHORT. Following this, the wake current, IWAKE is applied for a period of tWAKE

and the battery voltage is checked again to ensure that it is above the recharge threshold. The purpose of this

current is to attempt to close an open battery pack protector, if one is connected to the bqSWITCHER.

Passing both of the discharge and charge tests indicates a battery absent fault at the STAT pins. Failure of either

test starts a new charge cycle. For the absent battery condition, typically the voltage on the BAT pin rises and

falls between 0V and VOVPthresholds indefinitely.

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Product Folder Link(s): bq24100 bq24103 bq24103A bq24104 bq24105 bq24108 bq24109 bq24113 bq24113A

bq24115

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