S-8200AAC-M6T1U Datasheet, PDF (21/36 Pages) Seiko Instruments Inc – BATTERY PROTECTION IC FOR 1-CELL PACK

Rev.4.0_02
BATTERY PROTECTION IC FOR 1-CELL PACK
S-8200A Series
 Battery Protection IC Connection Example
EB+
R1
VDD
Battery C1
S-8200A Series
VSS
DO
CO
VM
R2
FET1
FET2
EB−
Figure 14
Table 11 Constants for External Components
Symbol Part
Purpose
Min.
Typ.
Max.
Remark
FET1
N-channel
MOS FET
Discharge control
Threshold voltage ≤ Overdischarge
detection voltage^*1
−
−
−
Gate to source withstand voltage ≥
Charger voltage^*2
FET2
N-channel
MOS FET
Charge control
Threshold voltage ≤ Overdischarge
detection voltage^*1
−
−
−
Gate to source withstand voltage ≥
Charger voltage^*2
Resistance should be as small as
R1
Resistor
ESD protection,
For power fluctuation
150 Ω
330 Ω
1 kΩ
possible to avoid lowering the
overcharge detection accuracy due to
current consumption.^*3
C1
Capacitor For power fluctuation 0.068 μF 0.1 μF
1.0 μF
Connect a capacitor of 0.068 μF or
higher between VDD pin and VSS pin.^*4
Protection for reverse
Select as large a resistance as possible
R2
Resistor connection of a
charger
300 Ω
2 kΩ
4 kΩ
to prevent current when a charger is
connected in reverse.^*5
*1. If the threshold voltage of an FET is low, the FET may not cut the charge current. If an FET with a threshold voltage equal
to or higher than the overdischarge detection voltage is used, discharging may be stopped before overdischarge is
detected.
*2. If the withstand voltage between the gate and source is lower than the charger voltage, the FET may be destroyed.
*3. An accuracy of overcharge detection voltage is guaranteed by R1 = 330 Ω. Connecting resistors with other values worsen
the accuracy. In case of connecting larger resistor to R1, the voltage between the VDD pin and VSS pin may exceed the
absolute maximum rating because the current flows to the S-8200A Series from the charger due to reverse connection of
charger. Connect a resistor of 150 Ω or more to R1 for ESD protection.
*4. When connecting a resistor of 150 Ω or less to R1 or a capacitor of 0.068 μF or less to C1, the S-8200A Series may
malfunction when power dissipation is largely fluctuated.
*5. When a resistor more than 4 kΩ is connected to R2, the charge current may not be cut.
Caution 1. The above constants may be changed without notice.
2. It has not been confirmed whether the operation is normal or not in circuits other than the above example
of connection. In addition, the example of connection shown above and the constant do not guarantee
proper operation. Perform thorough evaluation using the actual application to set the constant.
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