S-8253A SII [Seiko Instruments Inc], S-8253A Datasheet - Page 18

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

18
BATTERY PROTECTION IC FOR 2-SERIAL OR 3-SERIAL-CELL PACK
S-8253A/B Series
7. Delay Circuit
8. CTL Pin
The following detection delay times are determined by dividing a clock of approximately 3.57 kHz by the counter.
(Example) Oscillator clock cycle (T
Remark The overcurrent detection delay time 2 (t
The S-8253A/B Series has a control pin for charge / discharge control and shortening the test time. The levels, “L”, “H”,
and “M”, of the voltage input to the CTL pin determine the status of the S-8253A/B Series: normal operation, charge /
discharge inhibition, or test time shortening. The CTL pin takes precedence over the battery protection circuit. During
normal use, short the CTL pin and VSS pin.
*1. In this status, delay times are shortened in 1 / 60 to 1 / 30 scale.
*2. The pin status is controlled by the voltage detection circuit.
Caution 1.
Open
High (V
Middle (V
Low (V
CTLL
CTL
CTL Pin Potential
2.
3.
CTLL
overcurrent detection voltage 1 (V
overcurrent detection voltage 3 (V
overcurrent 3 (t
FET off within t
≥ V
≥ V
Overcharge detection delay time (t
Overdischarge detection delay time (t
Overcurrent detection delay time 1 (t
Overcurrent detection delay time 2 (t
< V
If you use the middle potential of the CTL pin, contact SII marketing department.
Please note unexpected behavior might occur when electrical potential difference between the
CTL pin (“L” level) and VSS is generated through the external filter (R
input voltage fluctuations.
If the potential of the CTL pin is middle, overcurrent detection voltage 1 (V
CTLH
CTL
CTL
)
VMP pin voltage
DOP pin voltage
)
< V
CTLH
IOV2
IOV3
)
) after the detection of overcurrent 1 (V
or t
IOV3
Table 10 Conditions Set by CTL Pin
CLK
of each detection.
) :
V
V
V
V
V
V
V
Charge / discharge inhibited status
Charge / discharge inhibited status
Delay time-shortening status
Normal status
DD
IOV2
IOV3
SS
DD
SS
IOV1
Seiko Instruments Inc.
IOV1
IOV3
CU
) is detected. As soon as the overcurrent detection voltage 2 (V
) is detected over the detection delay time for overcurrent 2 (t
IOV1
IOV2
) :
DL
Overcurrent detection
IOV2
delay time 2 (t
) :
) :
) :
Status of IC
Figure 10
) and overcurrent detection delay time 3 (t
280 µs
1.15 s
144 ms
9 ms
4.5 ms
IOV2
)
*1
IOV1
), the S-8253A/B turns the discharging control
t
D
0 ≤ t
COP Pin
High-Z
High-Z
D
(
(
*2
*2
≤ t
)
)
IOV2
VSS
Time
Time
and C
IOV1
DOP Pin
) does not operate.
IOV3
V
V
VSS
(
(
*2
*2
DD
DD
) start when the
)
)
Rev.3.7
) as a result of
IOV2
IOV2
_00
) or
) or