S-8241 Seiko Instruments, S-8241 Datasheet - Page 17

• Manufacturer Part Number: S-8241
• Description: Battery Protection IC for 1-Cell Pack
• Manufacturer: Seiko Instruments

Rev.4.1
0V Battery Charging Function
0V Battery Charge Inhibiting Function
This function enables the charging of a connected battery whose voltage is 0 V by self-discharge. When a
charger having 0 V battery start charging charger voltage (V
EB- pins, the charging control FET gate is fixed to V
the source of the charging control FET becomes equal to or higher than the turn-on voltage by 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. If the
battery voltage becomes equal to or higher than the overdischarge release voltage (V
condition returns.
This function forbids the charging of a connected battery which is short-circuited internally (0V battery).
When the battery voltage becomes 0.9 V (typ.) or lower, the charging control FET gate is fixed to EB-
potential to forbid charging. Charging can be performed, when the battery voltage is the 0 V battery charge
inhibiting voltage (V
(1) Some battery providers do not recommend charging of completely discharged batteries. Please refer to battery
(2) The 0V battery charging function has higher priority than the abnormal charge current detection function.
(3) When a battery is connected to the IC for the first time, the IC may not enter the normal condition in which
providers before the selection of 0 V battery charging function.
Consequently, a product with the 0 V battery charging function charges a battery and abnormal charge current
cannot be detected during the battery voltage is low (at most 1.8 V or lower).
discharging is possible. In this case, set the VM pin voltage equal to the V
connect a charger) to enter the normal condition.
_01
0INH
) or higher.
(1) (2) (3)
(1) (3)
Seiko Instruments Inc.
BATTERY PROTECTION IC FOR 1-CELL PACK
DD
potential. When the voltage between the gate and
0CHA
) or higher is connected between EB+ and
SS
voltage (short the VM and VSS pins or
DU
S-8241 Series
), the normal
17