S-8253A SII [Seiko Instruments Inc], S-8253A Datasheet - Page 16

• Manufacturer Part Number: S-8253A
• Description: BATTERY PROTECTION IC FOR 2-SERIAL OR 3-SERIAL-CELL PACK
• Manufacturer: SII [Seiko Instruments Inc]

16
BATTERY PROTECTION IC FOR 2-SERIAL OR 3-SERIAL-CELL PACK
S-8253A/B Series
Remark Refer to “
1. Normal Status
2. Overcharge Status
3. Overdischarge Status
4. Power-down Status
Operation
When all of the battery voltages are in the range from V
value (the VMP pin voltage is higher than V
Caution When the battery is connected for the first time, discharging may not be enabled. In this case, short
When any one of the battery voltages becomes higher than V
becomes high impedance. Because the COP pin is pulled up to the EB+ pin voltage by an external resistor, the
charging FET is turned off to stop charging. This is called the overcharge status. The overcharge status is released
when one of the following two conditions holds.
When any one of the battery voltages becomes lower than V
voltage becomes V
status. After discharging is stopped due to the overdischarge status, the S-8253A/B Series enters the power-down
status.
When discharging has stopped due to the overdischarge status, the VMP pin is pulled down to the V
resistor. When the VMP pin voltage is lower than Typ. 0.8 V, the S-8253A/B Series enters the power-down status. In
the power-down status, almost all the circuits of the S-8253A/B Series stop and the current consumption is I
The conditions of each output pin are as follows.
The power-down status is released when the following condition holds.
The overdischarging status is released when the following two conditions hold.
(1) The VMP pin voltage is Typ. 0.8 V or higher.
(1) All battery voltages become V
(2) All of the battery voltages are V
(1) COP pin : High-Z
(2) DOP pin : V
(1) All battery voltage is released at V
(2) All battery voltage is released at V
current flows through the body diode of the charging FET immediately after discharging is started when the
charger is removed and a load is connected, the VMP pin voltage momentarily decreases by approximately
0.6 V from the VDD pin voltage. The IC detects this voltage and releases the overcharging status).
pin voltage is lower than V
voltage is V
hysteresis is released and electric discharge control FET is turned on at V
the VMP pin and VDD pin or connect the charger to restore the normal status.
DD
Battery Protection IC Connection Example”.
DD
DD
level, and the discharging FET is turned off to stop discharging. This is called the overdischarging
or higher (when a charger is connected and VMP pin voltage is V
DD
CLn
.
CUn
DLn
or lower.
or lower, and the VMP pin voltage is V
DUn
Seiko Instruments Inc.
DD
or higher when the VMP pin voltage is Typ. 0.8 V or higher and the VMP pin
or higher when the VMP pin voltage is Typ. 0.8 V or higher and the VMP
− V
IOV1
), the charging and discharging FETs are turned on.
DLn
to V
DLn
CUn
CUn
and the state continues for t
and the state continues for t
and the discharge current is lower than the specified
DD
− V
DLn
IOV1
).
or lower (since the discharge
DD
DL
CU
or higher, overdischarge
or longer, the DOP pin
or longer, the COP pin
SS
level by the R
Rev.3.7
PDN
or lower.
_00
VMS