S-8211CDD-M5T1U datasheet(22/43 Pages) ABLIC

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BATTERY PROTECTION IC FOR 1-CELL PACK

S-8211C Series

Rev.7.7_03

3. Overdischarge status

3. 1 With power-down function

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 S-8211C 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 S-8211C

Series (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 status is connected to a charger and provided that the VM pin voltage is lower

than

0.7 V typ., the S-8211C 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 S-8211C Series releases the overdischarge status when the battery voltage reaches

overdischarge release voltage (VDU) or higher.

3. 2 Without power-down function

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 S-8211C 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 S-8211C

Series (RVMD).

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

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

than

0.7 V typ., the S-8211C 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 S-8211C Series releases the overdischarge status when the battery voltage reaches

overdischarge release voltage (VDU) or higher.

4. Discharge overcurrent status (discharge overcurrent, load short-circuiting)

When a battery in the normal status is in the status where the VM pin voltage is equal to or higher than the discharge

overcurrent detection voltage (VDIOV) because the discharge current is higher than the specified value and the status

lasts for the discharge overcurrent detection delay time (tDIOV), the discharge control FET is turned off and

discharging is stopped. This status is called the discharge overcurrent status.

In the discharge overcurrent status, the VM pin and VSS pin are shorted by the resistor between VM pin and VSS pin

(RVMS) in the S-8211C Series. However, the VM pin voltage is at the VDD potential due to the load as long as the load

is connected. When the load is disconnected completely, the VM pin returns to the VSS potential.

If the S-8211C Series detects that the VM pin voltage returns to discharge overcurrent detection voltage (VDIOV) or

lower, the discharge overcurrent status is restored to the normal status.

The S-8211C Series will be restored to the normal status from discharge overcurrent detection status even when the

VM pin voltage becomes the discharge overcurrent detection voltage (VDIOV) or lower by connecting the charger.

The resistance (RVMD) between the VM pin and VDD pin is not connected in the discharge overcurrent status.

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