BATTERY PROTECTION IC FOR 1-CELL PACK

S-8261 Series

Seiko Instruments Inc.

21

8. DP Pin

The DP pin is a test pin for delay time measurement and it should be open in the actual application. If a capacitor

whose capacitance is larger than 1000 pF or a resistor whose resistance is less than 1 M

Ω is connected to this pin,

error may occur in the delay times or in the detection voltages.

9. 0 V Battery Charge Function “Available”

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

+ pin and EB− pin by connecting a

charger, the charging control FET gate is fixed to VDD pin voltage. When the voltage between the gate and source

of the charging control FET becomes equal to or higher than the turn-on voltage due to the charger voltage, the

charging control FET is turned on to start charging. At this time, the discharging control FET is off and the charging

current flows through the internal parasitic diode in the discharging control FET. When the battery voltage becomes

S-8261 Series enters the normal status.

Caution

Some battery providers do not recommend charging for completely self-discharged battery.

Please ask battery providers before determine whether to enable or inhibit the 0 V battery charge

function.

Remark

The 0 V battery charge function has higher priority than the abnormal charge current detection function.

Consequently, a product with the 0 V battery charging function is enabled charges a battery forcibly and

abnormal charge current cannot be detected when the battery voltage is low.

10. 0 V Battery Charge Function “Unavailable”

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

is fixed to EB

− pin voltage to inhibit charging. When the battery voltage is the 0 V battery charge inhibition battery

Caution

Some battery providers do not recommend charging for completely self-discharged battery.

Please ask battery providers before determining the 0 V battery charge function.