s-8204a Seiko Instruments Inc., s-8204a Datasheet - Page 16

• Manufacturer Part Number: s-8204a
• 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-8204A Series
8. Delay Time Setting
In case C
In the S-8204A 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
charging to the CCT pin’s capacitor (C
COP pin is set in high impedance if the voltage at the CCT pin reaches the CCT pin detection voltage
(V
t
Overdischarge detection delay time (t
overcurrent detection delay time 2 (t
using the following equations as well.
Short circuit detection voltage delay time (t
CU
CCT
t
t
t
t
t
t
t
t
t
t
is calculated using the following equation (V
CU
DL
DIOV1
DIOV2
CIOV
CU
DL
DIOV1
DIOV2
CIOV
). This period is overcharge detection delay time (t
[ms] = 1000 [kΩ] (Typ.) × 0.1 [µF] = 100 [ms] (Typ.)
[ms] =
[s] = 10.0 [MΩ] (Typ.) × 0.1 [µF] = 1.0 [s] (Typ.)
[s] = −ln ( 1 − V
[ms] = 200 [kΩ] (Typ.) × 0.1 [µF] = 20 [ms] (Typ.)
[ms] =
[ms] = 200 [kΩ] (Typ.) × 0.1 [µF] = 20 [ms] (Typ.)
[ms] = 20 [kΩ] (Typ.) × 0.1 [µF] = 2.0 [ms] (Typ.)
[ms] =
[ms] =
CCT
= −ln ( 1 − 0.7 (Typ.)) × C
= 10.0 [MΩ] (Typ.) × C
= C
−
ln ( 1
−
−
−
ln ( 1
CDT
ln ( 1
ln ( 1
−
= C
V
−
CCT
−
−
CDT
V
CIT
V
V
CIT
/ V
CIT
CIT
/ V
= 0.1 [µF], each delay time t
/ V
DS
/ V
/ V
DS
DS
) × C
DS
DS
) × C
CCT
) × C
) × C
) × C
CCT
CCT
[µF]
DIOV2
CDT
CIT
DL
CIT
CIT
CCT
[µF] × 8.31 [MΩ] (Typ.)
Seiko Instruments Inc.
), discharge overcurrent detection delay time 1 (t
[µF] × R
[µF] × R
[µF] × R
), charge overcurrent detection delay time (t
[µF] × R
[µF] × R
) via the CCT pin’s resistor (R
SHORT
DS
CCT
) is fixed internally.
CDT
CIT1
CIT1
CIT2
= V1 + V2 + V3 + V4).
[MΩ]
[kΩ]
[kΩ]
[kΩ]
[kΩ]
CU
CU
, t
).
DL
, t
DIOV1
, t
CUn
DIOV2
CCT
or more, the S-8204 starts
, t
). After a certain period, the
CIOV
is calculated as follows.
CIOV
DIOV1
) are calculated
Rev.1.3
), discharge
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