S-8242B Datasheet, PDF (12/30 Pages) Seiko Instruments Inc – BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK

BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK
S-8242B Series
Rev.1.4_00
6. 0 V Battery Charge Function
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 (V_0CHA) or a higher voltage is applied between the EB+ and EB− pins by
connecting a charger, the charging control FET gate is fixed to the 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 equal to or higher than overdischarge release voltage n (V_DUn), the
S-8242B Series enters the normal status.
Caution Some battery providers do not recommend charging for a completely self-discharged battery.
Please ask the battery provider to determine whether to enable or inhibit the 0 V battery charge
function.
7. 0 V Battery Charge Inhibition Function
This function inhibits recharging when a battery that is internally short-circuited (0 V) is connected. When the battery
voltage (The voltage between VDD and VSS pins) is the 0 V battery charge inhibition battery voltage (V_0INH) or lower,
the charging control FET gate is fixed to the EB− pin voltage to inhibit charging. When the battery voltage is the 0 V
battery charge inhibition battery voltage (V_0INH) or higher, charging can be performed.
Caution Some battery providers do not recommend charging for a completely self-discharged battery.
Please ask the battery provider to determine whether to enable or inhibit the 0 V battery charge
function.
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Seiko Instruments Inc.