UB211CXXL-AF5-R datasheet(5/10 Pages) UTC

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UB211C

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

5 of 10

www.unisonic.com.tw

QW-R502-482.b

OPERATION

1. Normal Condition

This IC monitors the voltage of the battery connected between the VDD pin and VSS pin and the voltage

difference between the VM pin and VSS pin to control charging and discharging. When the battery voltage is in the

range from overdischarge detection voltage (VDL) to overcharge detection voltage (VCU), and the VM pin voltage is in

the range from the charge overcurrent detection voltage (VCIOV) to discharge overcurrent detection voltage (VDIOV),

the IC turns both the charging and discharging control FETs on. This condition is called the normal conditon, and in

this condition charging and discharging can be carried out freely.

The resistance (RVMD) between the VM pin and VDD pin, and the resistance (RVMS) between the VM pin and VSS

pin are not connected in the normal status.

Note: When the battery is connected for the first time, discharging may not be enabled. In this case, short the VM pin

and VSS pin or connect the charger to restore the normal condition.

2. Overcharge Condition

When the battery voltage becomes higher than overcharge detection voltage (VCU) during charging in the

normal condition and this state continues for the overcharge detection delay time (tCU), the UTC UB211C Series

turns the charging control FET off to stop charging. This state is called the overcharge condition.

The resistance (RVMD) between the VM pin and VDD pin, and the resistance (RVMS) between the VM pin and VSS

pin are not connected in the overcharge condition.The overcharge condition is released in the following two cases.

(1) When the VM pin voltage is higher than or equal to the charge overcurrent detection voltage (VCIOV), and is

lower than the discharge overcurrent detection voltage (VDIOV), UTC UB211C Series releases the overcharge status

when the battery voltage falls below the overcharge release voltage (VCL).

(2) When the VM pin voltage is higher than or equal to the discharge overcurrent detection voltage (VDIOV), UTC

UB211C

Series releases the overcharge condition when the battery voltage falls below the overcharge detection

voltage (VCU).

The discharge is started by connecting a load after the overcharge detection, the VM pin voltage rises more

than the voltage at VSS pin, because the discharge current flows through the charging control FET. If this VM pin

voltage is higher than or equal to the discharge overcurrent detection voltage (VDIOV), UTC UB211C Series releases

the overcharge status when the battery voltage is lower than or equal to the overcharge detection voltage (VCU).

For the actual application boards, changing the battery voltage and the charger voltage simultaneously enables

to measure the overcharge release voltage (VCL). In this case, the charger is always necessary to have the

equivalent voltage level to the battery voltage. The charger keeps VM pin voltage higher than or equal to the charge

overcurrent detection voltage (VCIOV) and lower than or equal to the discharge overcurrent detection voltage (VDIOV).

UTC UB211C Series releases the overcharge status when the battery voltage falls below the overcharge release

voltage (VCL).

Note 1. If the battery is charged to a voltage higher than overcharge detection voltage (VCU) and the battery voltage

does not fall below overcharge detection voltage (VCU) even when a heavy load is connected, discharge

overcurrent detection and load short-circuiting detection do not function until the battery voltage falls below

overcharge detection voltage (VCU). Since an actual battery has an internal impedance of tens of mΩ, the

battery voltage drops immediately after a heavy load that causes overcurrent is connected, and discharge

overcurrent detection and load shortcircuiting detection function.

Note 2. When a charger is connected after overcharge detection, the overcharge status is not released even if the

battery voltage is below overcharge release voltage (VCL). The overcharge status is released when the VM

pin voltage goes over the charge overcurrent detection voltage (VCIOV) by removing the charger.

3. Overdischarge Condition

When the battery voltage falls below overdischarge detection voltage (VDL) during discharging in the normal

status and the detection continues for the overdischarge detection delay time (tDL) or longer, the UTC UB211C

Series turns the discharging control FET off to stop discharging. This condition is called the overdischarge status.

Under the overdischarge status, the VM pin voltage is pulled up by the resistor between the VM pin and VDD pin in

the IC (RVMD). When voltage difference between the VM pin and VDD pin then is 1.3 V (Typ.) or lower, the current

consumption is reduced to the power-down current consumption (IPDN). This condition is called the power-down

status. The resistance (RVMS) between the VM pin and VSS pin is not connected in the power-down status and the

overdischarge status.

The power-down status is released when a charger is connected and the voltage difference between the VM pin

and VDD pin becomes 1.3 V (typ.) or higher.

When a battery in the overdischarge condition is connected to a charger and provided that the VM pin voltage is

lower than -0.7 V (Typ.), the UTC UB211C Series releases the overdischarge status and turns the discharging FET

on when the battery voltage reaches overdischarge detection voltage (VDL) or higher.

When a battery in the overdischarge status is connected to a charger and provided that the VM pin voltage is

not lower than -0.7 V (Typ.), the UTC UB211C Series releases the overdischarge status when the battery voltage

reaches overdischarge release voltage (VDU) or higher.

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