UB24205L-S08-R datasheet(6/10 Pages) UTC

6 / 10 page

UB24205

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

6 of 10

www.unisonic.com.tw

QW-R121-019.b



APPLICATION INFORMATION

Normal Condition

The voltage of the battery connected between VDD and VSS can be monitored by the UTC UB24205.The voltage

difference between CSI and VSS can sense the charge and discharge scheme. Under this condition:

VODL<VDD<VOCU and VCH<VCSI<VOI1, the UTC UB24205 will turn on the charging control MOSFET (internal) and

discharging control MOSFET (internal), the battery’s charging (or discharging) is in normal condition.

Overcharge Condition

When the battery voltage becomes higher than the overcharge detection voltage (VOCU) during normal charging

condition through a delay time longer than TOC (the overcharge detection delay time), the charging will be stopped.

Release of Overcharge Condition

Two ways to return to normal condition from overcharge condition:

(1)

Under the condition: the battery is self discharging, and if VDD<VOCR and VOI1>VCSI>VCH occurs, the UTC

UB24205

will be back to normal condition.

(2)

Connect the UTC UB24205 to a load and remove the charger.

Overdischarge Condition

When the battery voltage falls below the overdischarge detection voltage (VODL) during discharging condition

and through a delay time longer than TOD (the overdischarge detection delay time), the discharging will be stopped.

And then CSI will be pulled up to VDD through an internal resistance. When VCSI>VOI2, the chip will enter into

power-down mode. In this mode, the current consumption is lower than 0.1μA.

Release of Power-down mode

There are two ways back to normal condition:

(1)

If VCSI<VCH (Charger detection), when VDD>VODL.

(2)

If VCH<VCSI<VOI2, the condition VDD>VODR.

Charger Detection

Charger detection is this action: while connecting to a charger after entering into power-down mode, then if

VDD<VCH and when VDD>VODL, the system will be back to normal condition as described in 1) of previous section.

Abnormal Charge Current Condition

The abnormal charge current condition is when a charger is connected to the battery system in normal condition,

then if VDD<VOCU and VCSI<VCH occurs through a delay time than TOC (delay time of overcharge detection), and in

this condition the charging will be stopped.

Over Current/Short Circuit Condition

The over current (or short circuit) condition is when the current is too large during discharging under normal

condition as a result of the voltage detected by CSI is greater than VOI1 (or VOI2) through a delay time TOI1(TOI2). In

this over current (or short circuit) condition, the discharging will be stopped and CSI will be pulled down to VSS

through an internal resistance.

Release of Over Current/Short Circuit Condition

If the load is removed or the impedance between VBAT+ and VBAT- is larger than 500kΩ as well as VCSI<VOI1, the

system will be back to normal condition.

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