UB24205 Ver la hoja de datos (PDF) - Unisonic Technologies
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UB24205 Datasheet PDF : 10 Pages
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UB24205
Preliminary
CMOS IC
APPLICATION INFORMATION
1. 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.
2. 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.
3. 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.
4. 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.
5. 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.
6. 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.
7. 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.
8. 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.
9. 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.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R121-019.a
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