s-8264a Seiko Instruments Inc., s-8264a Datasheet - Page 12

• Manufacturer Part Number: s-8264a
• Description: Battery Protection Ic For 2-serial To 4-serial-cell Pack Secondary Protection
• Manufacturer: Seiko Instruments Inc.

12
BATTERY PROTECTION IC FOR 2-SERIAL TO 4-SERIAL-CELL PACK (SECONDARY PROTECTION)
S-8264A/B Series
Operation
1. Overcharge Detection
2. Overcharge Timer Reset
When the voltage of one of the batteries exceeds the overcharge detection voltage (V
conditions and the state is retained for the overcharge detection delay time (t
is called overcharge. Attaching FET to the CO pin provides charge control and a second protection.
In the S-8264A Series, if the voltage of all the batteries decreases below the total of the overcharge detection voltage
(V
longer, CO becomes “L”.
In the S-8264B Series, if the voltage of all the batteries decreases below the total of the overcharge detection voltage
(V
longer, the overcharge status is released; however, CO stays at “H”. When the CTL pin is switched from “L” to “H”, CO
becomes “L”.
When an overcharge release noise that forces the voltage of the battery temporarily below the overcharge detection
voltage (V
stopped, t
timer reset delay time (t
counting of t
CU
CU
) and the overcharge hysteresis voltage (V
) and the overcharge hysteresis voltage (V
CU
CU
CU
) is input during the overcharge detection delay time (t
is continuously counted if the time the overcharge release noise persists is shorter than the overcharge
is reset once. After that, when V
TR
). Under the same conditions, if the time the overcharge release noise persists is t
Seiko Instruments Inc.
HC
HC
CU
) and the state is retained for the overcharge release delay time (t
) and the state is retained for the overcharge release delay time (t
has been exceeded, counting t
CU
) from when V
CU
) or longer, CO becomes “H”. This state
CU
CU
resumes.
CU
is exceeded to when charging is
) during charging under normal
Rev.2.0
TR
or longer,
CL
CL
_00
) or
) or