BATTERY PROTECTION IC WITH ALARM FUNCTION FOR 1-CELL PACK

Rev.1.0_00

S-82T1A Series

19

4.

Overdischarge status

When the battery voltage falls below VDL during discharging in the normal status and the condition continues for the

overdischarge detection delay time (tDL) or longer, the discharge control FET is turned off and discharging is stopped.

This status is called the overdischarge status.

Under the overdischarge status, VDD pin and VM pin are shorted by RVMD in this IC. The VM pin voltage is pulled up by

RVMD.

When connecting a charger in the overdischarge status, the battery voltage reaches VDL or higher and this IC releases

the overdischarge status if the VM pin voltage is below 0 V typ.

The battery voltage reaches the overdischarge release voltage (VDU) or higher and this IC releases the overdischarge

status if the VM pin voltage is not below 0 V typ. RVMS is not connected in the overdischarge status.

4. 1

With power-down function

Under the overdischarge status, when the VM pin voltage is 0.7 V typ. or higher, the power-down function works and

the current consumption is reduced to the current consumption during power-down (IPDN). By connecting a battery

charger, the power-down function is released when the VM pin voltage is 0.7 V typ. or lower.

• When a battery is not connected to a charger and the VM pin voltage ≥ 0.7 V typ., this IC maintains the

overdischarge status even when the battery voltage reaches VDU or higher.

• When a battery is connected to a charger and 0.7 V typ. > the VM pin voltage > 0 V typ., the battery voltage reaches

VDU or higher and this IC releases the overdischarge status.

• When a battery is connected to a charger and 0 V typ. ≥ the VM pin voltage, the battery voltage reaches VDL or

higher and this IC releases the overdischarge status.

4. 2

Without power-down function

Under the overdischarge status, the power-down function does not work even when the VM pin voltage is 0.7 V typ.

or higher.

• When a battery is not connected to a charger and the VM pin voltage ≥ 0.7 V typ., the battery voltage reaches VDU

or higher and this IC releases the overdischarge status.

• When a battery is connected to a charger and 0.7 V typ. > the VM pin voltage > 0 V typ., the battery voltage reaches

VDU or higher and this IC releases the overdischarge status.

• When a battery is connected to a charger and 0 V typ. ≥ the VM pin voltage, the battery voltage reaches VDL or

higher and this IC releases the overdischarge status.

5.

Discharge overcurrent status

(discharge overcurrent 1, discharge overcurrent 2, load short- circuiting, load short-circuiting 2)

5. 1

Discharge overcurrent 1, discharge overcurrent 2, load short-circuiting

When a battery in the normal status is in the status where the VINI pin voltage is equal to or higher than VDIOV1

because the discharge current is equal to or higher than the specified value and the status continues for the discharge

overcurrent 1 detection delay time (tDIOV1) or longer, the discharge control FET is turned off and discharging is stopped.

This status is called the discharge overcurrent status.

Under the discharge overcurrent status, VM pin and VSS pin are shorted by RVMS in this IC. However, the VM pin

voltage is the VDD pin voltage due to the load as long as the load is connected. When the load is disconnected, the

VM pin voltage returns to the VSS pin voltage.

When the VM pin voltage returns to VRIOV or lower, this IC releases the discharge overcurrent status.

RVMD is not connected in the discharge overcurrent status.

5. 2

Load short-circuiting 2

When a battery in the normal status is in the status where a load causing discharge overcurrent is connected, and the

VM pin voltage is equal to or higher than the load short-circuiting 2 detection voltage (VSHORT2) and the status continues

for the load short-circuiting detection delay time (tSHORT) or longer, the discharge control FET is turned off and

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

This IC releases the discharge overcurrent status in the same way as in "5. 1 Discharge overcurrent 1, discharge

overcurrent 2, load short-circuiting".