s-8232nxft-t2-g Seiko Instruments Inc., s-8232nxft-t2-g Datasheet - Page 18

• Manufacturer Part Number: s-8232nxft-t2-g
• Description: Battery Protection Ic For 2-serial-cell Pack S-8232 Series
• Manufacturer: Seiko Instruments Inc.

*1. R4 = R1 is required. Overcharge detection voltage increases by R4. For example 10 kΩ (R4) increases overcharge
*2. The overcharge detection delay time (t
*3. When the resistor R3 is set less than 300 Ω and a charger is reverse-connected, current which exceeds the power
*4. A 4.7 MΩ resistor is needed for R5 to inhibit 0 V battery charging. Current consumption increases when the R5
Caution 1. The above constants may be changed without notice.
18
FET1
FET2
R1
C1
R2
C2
R4
C3
R3
R5
BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK
S-8232 Series
Symbol
Battery Protection IC Connection Example
detection voltage by 20 mV.
delay time (t
dissipation of the package will flow and the IC may break. But excessive R3 causes increase of overcurrent detection
voltage 1 (V
overcurrent detection voltage 1 (V
resistance is below 4.7 MΩ. R5 should be connected when the product has 0 V battery charging inhibition.
2. It has not been confirmed whether the operation is normal or not in circuits other than the above example
Nch MOS FET Discharge control
Nch MOS FET Charge control
Chip resistor
Chip capacitor For power fluctuation
Chip resistor
Chip capacitor For power fluctuation
Chip resistor
Chip capacitor Delay time setting
Chip resistor
Chip resistor
of connection. In addition, the example of connection shown above and the constant do not guarantee
proper operation. Perform through evaluation using the actual application to set the constant.
Parts
IOV
IOV1
) change with the external capacitor C3.
). V
Battery 1
Battery 2
IOV1
ESD protection
ESD protection
ESD protection
Protection for
charger reverse
connection
0 V battery
charging inhibition
changes to V
R1
1 kΩ
R2
1 kΩ
R4
1 kΩ
Purpose
Table 8 Constants for External Components
C1
C2
IOV1
) from 0.100 V to 0.113 V.
IOV1
CU
0.22 µF
0.22 µF
VSS
SENS
VCC
VC
), the overdischarge detection delay time (t
FET1
= (R3 + R
Seiko Instruments Inc.
DO
(4.7 MΩ)
0.22 µF
0.22 µF
0.22 µF
1 kΩ
1 kΩ
1 kΩ
1 kΩ
Typ.


VSM
S-8232 Series
Figure 8
FET2
) / R
CO
= R1 min. = R1 max. Same value as R1 and R2.
VSM
(1 MΩ)
300 Ω
300 Ω
300 Ω
0 µF
0 µF
0 µF
Min.


× V
R5
4.7 MΩ
IOV1
. For example, 50 kΩ resistor (R3) increases
(10 MΩ)
Max.
1 kΩ
1 kΩ
5 kΩ
1 µF
1 µF
1 µF
VM


ICT
R3
1 kΩ
Attention should be paid to leak
current of C3.
Discharge can’t be stopped at less
than 300 Ω when a charger is
reverse-connected.
R5 should be added when the
product has 0 V battery charge
inhibition. Lower resistance
increases current consumption.
CD
Delay time setting
), and the over current detection
0.22 µF
C3
EB+
EB−
Remark
*2






*3
Rev.5.7
*1
_00
*4