s-8204bad-tct1g Seiko Instruments Inc., s-8204bad-tct1g Datasheet - Page 16

• Manufacturer Part Number: s-8204bad-tct1g
• Description: Battery Protection Ic For 3-series Or 4-series Cell Pack
• Manufacturer: Seiko Instruments Inc.

16
BATTERY PROTECTION IC FOR 3-SERIES OR 4-SERIES CELL PACK
S-8204B Series
7. Delay Time Setting
In case C
Short circuit detection voltage delay time (t
In the S-8204B Series, users are able to set delay time for the period; from detecting any voltage of the batteries or
detecting changes in the voltage at the VINI pin, to the output to the COP, DOP pin. Each delay time is determined by
a resistor in the IC and an external capacitor.
In the overchage detection, when any voltage of the batteries gets V
CCT pin’s capacitor (C
impedance if the voltage at the CCT pin reaches the CCT pin detection voltage (V
detection delay time (t
t
Overdischarge detection delay time (t
detection delay time 2 (t
CU
t
t
t
t
is calculated using the following equation (V
t
t
t
t
CU
DL
DIOV1
DIOV2
CU
DL
DIOV1
DIOV2
[ms] = 1000 [kΩ] (Typ.) × 0.1 [µF] = 100 [ms] (Typ.)
[s] = 10.0 [MΩ] (Typ.) × 0.1 [µF] = 1.0 [s] (Typ.)
[ms] = −ln ( 1 − V
[s] = −ln ( 1 − V
[ms] = 200 [kΩ] (Typ.) × 0.1 [µF] = 20 [ms] (Typ.)
[ms] = 20 [kΩ] (Typ.) × 0.1 [µF] = 2.0 [ms] (Typ.)
[ms] = −ln ( 1 − V
[ms] = −ln ( 1 − V
CCT
= −ln ( 1 − 0.7 (Typ.)) × C
= 10.0 [MΩ] (Typ.) × C
= C
CDT
= C
CU
CCT
CCT
DIOV2
CDT
CIT
).
) via the CCT pin’s resistor (R
/ V
CIT
CIT
= 0.1 [µF], each delay time t
/ V
) are calculated using the following equations as well.
DS
/ V
/ V
DS
) × C
DS
DS
CCT
) × C
) × C
) × C
CCT
[µF]
CCT
CDT
DL
[µF] × 8.31 [MΩ] (Typ.)
CIT
CIT
), discharge overcurrent detection delay time 1 (t
[µF] × R
[µF] × R
[µF] × R
[µF] × R
SHORT
Seiko Instruments Inc.
DS
) is fixed internally.
CCT
CDT
= V1 + V2 + V3 + V4).
CIT1
CIT2
[MΩ]
[kΩ]
[kΩ]
[kΩ]
CU
CCT
, t
). After a certain period, the COP pin is set in high
DL
, t
DIOV1
, t
CUn
DIOV2
or more, the S-8204B starts charging to the
is calculated as follows.
CCT
). This period is overcharge
DIOV1
), discharge overcurrent
Rev.1.3
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