BATTERY PROTECTION IC WITH ALARM FUNCTION FOR 1-CELL PACK

S-82T1A Series

Rev.1.0_00

20

6.

Charge overcurrent status

When a battery in the normal status is in the status where the VINI pin voltage is equal to or lower than VCIOV because

the charge current is equal to or higher than the specified value and the status continues for the charge overcurrent

detection delay time (tCIOV) or longer, the charge control FET is turned off and charging is stopped. This status is called

the charge overcurrent status.

This IC releases the charge overcurrent status when the discharge current flows and the VM pin voltage is 0.35 V typ.

or higher by removing the charger.

The charge overcurrent detection does not function in the overdischarge status.

7.

0 V battery charge enabled

This function is used to recharge a connected battery whose voltage is 0 V due to self-discharge. When the 0 V battery

charge starting charger voltage (V0CHA) or a higher voltage is applied between the EB

+ and EB− pins by connecting a

charger, the charge control FET gate is fixed to the VDD pin voltage.

When the voltage between the gate and source of the charge control FET becomes equal to or higher than the threshold

voltage due to the charger voltage, the charge control FET is turned on to start charging. At this time, the discharge

control FET is off and the charging current flows through the internal parasitic diode in the discharge control FET. When

the battery voltage becomes equal to or higher than VDL, this IC returns to the normal status.

Caution 1. Some battery providers do not recommend charging for a completely self-discharged lithium-ion

rechargeable battery. It depends on the characteristics of the lithium-ion rechargeable battery to

be used; therefore, please ask the battery provider to determine whether to enable or inhibit the

0 V battery charge.

2. The 0 V battery charge has higher priority than the charge overcurrent detection function.

Consequently, a product in which use of the 0 V battery charge is enabled charges a battery

forcibly and the charge overcurrent cannot be detected when the battery voltage is lower than VDL.

8.

0 V battery charge inhibited

This function inhibits charging when a battery that is internally short-circuited (0 V battery) is connected. When the battery

voltage is the 0 V battery charge inhibition battery voltage (V0INH) or lower, the charge control FET gate is fixed to the

EB

− pin voltage to inhibit charging. When the battery voltage is V0INH or higher, charging can be performed.

Caution Some battery providers do not recommend charging for a completely self-discharged lithium-ion

rechargeable battery. It depends on the characteristics of the lithium-ion rechargeable battery to be

used; therefore, please ask the battery provider to determine whether to enable or inhibit the 0 V

battery charge.