S-8232 Seiko, S-8232 Datasheet - Page 19

• Manufacturer Part Number: S-8232
• Description: BATTERY PROTECTION IC
• Manufacturer: Seiko

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Rev.5.4
• After the overcurrent detection delay, if either one of battery voltages equals the overdischarge detection
• When one of the battery voltages is overdischarge detection voltage (V
Precautions
voltage (V
occurs because capacitor C3 sets all of delay times (refer to the Figure 9 ) .
becomes higher than the overcharge detection voltage (V
overcharge detection delay time (t
[Cause]
[Conclusion]
[Cause]
[Conclusion]
When overcurrent detection is released until t
battery voltage is lower than V
typical.
This phenomenon occurs when all battery voltage is nearly equal to the overdischarge voltage (V
after overcurrent detected. It means that the battery capacity is small and those must be charged in
the future. Even if the state changes to overdischarge condition, the battery package capacity is same
as typical.
It is same as the overdischarge detection under the overcurrent condition. It occurs because capacitor
C3 sets all of delay times.
This phenomenon occurs when one battery voltage is lower than overdischarge voltage (V
batteries are charged by charger. Since voltage difference between two batteries is large in this
situation, the S-8232 Series immediately stops the charging of the other battery to reduce voltage
difference. This action improves the safety of a battery pack and dose not do any harm to the pack.
_00
DD1,2
) or lower, the overdischarge detection delay time becomes shorter than 10ms (min.). It
B attery
voltage
D O pin
voltage
V M pin
voltage
B attery
v oltage
V 1
B attery
v oltage
V 2
C O pin
v oltage
Load connect
V
V
EB −
CU
V
V
V
BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK
0 V
V
V
IO V 2
IO V 1
E B −
D D
C C
C C
SS
SS
V
V
V
V
V
V
V
V
V
V
DD1, 2
) (refer to the Figure 10 ) .
C U
C D
D U
D D
C U
C D
D U
D D
C C
S S
Seiko Instruments Inc.
Overcharge detect
The over current delay
The over discharge delay
at that time, charging goes on. So delay time is shorter than
Charger connected
D elay tim e = 0
Figure 10
Figure 9
IOV1
, the capacitor C3 is charged by S-8232 Series. If all
The delay time becomes shorter than typical
The battery voltage is equal to
or less the overdischarge voltage (V
after stopping the overcurrent.
CU1, 2
), the IC detects the overcharge without the
Overdischar g e state
DD1, 2
DD
)
) or lower and the other one
S-8232 Series
DD1, 2
DD1, 2
) and
19
)