S-8244 Datasheet, PDF (18/27 Pages) Seiko Instruments Inc – BATTERY PROTECTION IC FOR 1-SERIAL TO 4-SERIAL-CELL PACK (SECONDARY PROTECTION)

BATTERY PROTECTION IC FOR 1-SERIAL TO 4-SERIAL-CELL PACK (SECONDARY PROTECTION)
S-8244 Series
Rev.3.3_00
„ Precautions
• 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.
CMOS output active “H” and Nch open drain models
V_CD
V1 battery
V2 battery V3 battery
V4 battery
V_CU
Battery voltage
V_SS
V_CC
CO pin voltage
V_SS
C_ICT high
C_ICT low
C_ICT low
Setting voltage
ICT pin voltage
V_SS
Internal delay
C_ICT high
Delay
• 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_SS-short circuit,” “V_DD-short circuit” or “Open”
status.
• 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.
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Seiko Instruments Inc.