BATTERY PROTECTION IC FOR 2-SERIAL TO 4-SERIAL-CELL PACK (SECONDARY PROTECTION)
Rev.4.4_00
S-8264A/B/C Series
Operation
Remark Refer to “ Battery Protection IC Connection Example”.
1. Overcharge Detection
When the voltage of one of the batteries exceeds the overcharge detection voltage (VCU) during charging under normal
conditions and the state is retained for the overcharge detection delay time (tCU) or longer, CO becomes “H”. This state
is called overcharge. Connecting FET to the CO pin provides charge control and a second protection.
In the S-8264A/C Series, if the voltage of each of the batteries is lower than VCU + the overcharge hysteresis voltage
(VHC) and the state is retained for the overcharge release delay time (tCL) or longer, CO becomes “L”.
In the S-8264B Series, if the voltage of each of the batteries is lower than VCU + VHC and the state is retained for tCL or
longer, the overcharge state is released; however, CO stays at “H”. When the CTL pin is switched from “L” to “H”, CO
becomes “L”.
2. Overcharge Timer Reset Operation
When an overcharge release noise that forces the voltage of one of the batteries temporarily below VCU is input during
tCU from when VCU is exceeded to when charging is stopped, tCU is continuously counted if the time the overcharge
release noise persists is shorter than the overcharge timer reset delay time (tTR). Under the same conditions, if the time
the overcharge release noise persists is tTR or longer, counting of tCU is reset once. After that, when VCU has been
exceeded, counting tCU resumes.
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ABLIC [ ABLIC ]
