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S-8254AALFT-TB-G

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P29
BATTERY PROTECTION IC FOR 3-SERIAL- OR 4-SERIAL-CELL PACK
S-8254A Series
Rev.5.0_01
Seiko Instruments Inc.
16
9. SEL pin
The S-8254A Series has control pins. The SEL pin is used to switch between 3-cell and 4-cell protection.
When the SEL pin is low, overdischarge detection of the V4 cell is prohibited and an overdischarge is not
detected even if the V4 cell is shorted, therefore, the V4 cell can be used for 3-cell protection. The SEL
pin takes precedence over the battery protection circuit. Use the SEL pin at high or low.
Table 6 Conditions Set by SEL Pin
SEL Pin Condition
High 4-cell protection
Open Undefined
Low 3-cell protection
BATTERY PROTECTION IC FOR 3-SERIAL- OR 4-SERIAL-CELL PACK
Rev.5.0_01
S-8254A Series
Seiko Instruments Inc.
17
Timing Chart
1. Overcharge Detection and Overdischarge Detection
V
CUn
V
DUn
V
DLn
V
CLn
High-Z
V
SS
V
DD
V
SS
<1> <2> <1> <4> <1>
V
SS
V
DD
V
EB+
V
EB+
(n = 1 to 4)
Battery voltage
COP pin voltage
39 / 40×V
DD
VMP pin voltage
DOP pin voltage
Charger connection
Load connection
Status
*1
Overcharge connection delay time (t
CU
)
High-Z
1 / 2×V
DD
<3>
Overdischarge connection delay time (t
DL
)
*1. < 1 > : Normal status
< 2 > : Overcharge status
< 3 > : Overdischarge status
< 4 > : Power-down status
Remark The charger is assumed to charge with a constant current. V
EB+
indicates the open voltage of
the charger.
Figure 9
BATTERY PROTECTION IC FOR 3-SERIAL- OR 4-SERIAL-CELL PACK
S-8254A Series
Rev.5.0_01
Seiko Instruments Inc.
18
2. Overcurrent detection
V
CUn
V
DUn
V
DLn
(n = 1 to 4)
V
CLn
Battery voltage
V
HC
V
HD
V
DD
DOP pin voltage
V
SS
High-Z
V
EB+
V
SS
COP pin voltage
High-Z High-Z
V
DD
V
SS
VMP pin voltage
V
IOV3
V
IOV2
V
SS
VINI pin voltage
V
DD
V
IOV1
Load connection
Status
Overcurrent 1 detection
dela
y
time
(
t
IOV1
)
<1> <2> <1> <1> <2> <1> <2>
Overcurrent 2 detection
delay time (t
IOV2
)
Overcurrent 3 detection
delay time (t
IOV3
)
*1. < 1 > : Normal status
< 2 > : Overcurrent status
Remark The charger is assumed to charge with a constant current. V
EB+
indicates the open voltage of
the charger.
Figure 10
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P29

S-8254AALFT-TB-G

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Buy S-8254AALFT-TB-G
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Description:
Battery Management Lithium-Ion battery protection 3/4 cell
Lifecycle:
New from this manufacturer.
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