s-8244aafph-ceftfg Seiko Instruments Inc., s-8244aafph-ceftfg Datasheet - Page 18

• Manufacturer Part Number: s-8244aafph-ceftfg
• Description: Battery Protection Ic For 1-serial To 4-serial-cell Pack Secondary Protection
• Manufacturer: Seiko Instruments Inc.

18
BATTERY PROTECTION IC FOR 1-SERIAL TO 4-SERIAL-CELL PACK (SECONDARY PROTECTION)
S-8244 Series
Precautions
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Battery voltage
CO pin voltage
•
ICT pin voltage
Setting voltage
This IC charges the delay capacitor through the delay capacitor pin (ICT pin) immediately when the voltage of one
of batteries V1 to V4 reaches the overcharge voltage. Therefore, setting the resistor connected to the VCC pin to
any value greater than the recommended level causes a reduction in the IC power supply voltage because of
charge current of the delay capacitor. This may lead to a malfunction. Set up the resistor NOT to exceed the
typical value. If you change the resistance, please consult us.
DO NOT connect any of overcharged batteries. Even if only one overcharged battery is connected to this IC, the
IC detects overcharge, then charge current flows to the delay capacitor through the parasitic diode between pins
where the battery is not connected yet. This may lead to a malfunction. Please perform sufficient evaluation in
the case of use. Depending on an application circuit, even when the fault charge battery is not contained, the
connection turn of a battery may be restricted in order to prevent the output of CO detection pulse at the time of
battery connection.
Any position from V1 to V4 can be used when applying this IC for a one to three-cell battery. However, be sure to
short circuit between pins not in use (SENSE − VC1, VC1 − VC2, VC2 − VC3, or VC3 − VSS).
The application conditions for the input voltage, output voltage, and load current should not exceed the package
power dissipation.
Do not apply an electrostatic discharge to this IC that exceeds the performance ratings of the built-in electrostatic
protection circuit.
SII claims no responsibility for any and all disputes arising out of or in connection with any infringement of the
products including this IC upon patents owned by a third party.
In this IC, the output logic of the CO pin is inverted after several milliseconds of internal delay if this IC is under the
overcharge condition even ICT pin is either “V
V
V
V
V
V
SS
CU
CC
SS
SS
V
C
CD
ICT
Internal delay
CMOS output active “H” and Nch open drain models
high
V1 battery
C
ICT
Seiko Instruments Inc.
low
Delay
SS
− short circuit,” “V
C
ICT
C
ICT
V2 battery
high
low
DD
− short circuit” or “Open” status.
V3 battery
V4 battery
Rev.3.5
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