S-8215AAA-K8T2U Datasheet, PDF (11/29 Pages) Seiko Instruments Inc – BATTERY PROTECTION IC FOR 3-SERIAL TO 5-SERIAL CELL PACK

BATTERY PROTECTION IC FOR 3-SERIAL TO 5-SERIAL CELL PACK (SECONDARY PROTECTION)
Rev.2.3_02
S-8215A Series
 Operation
Remark Refer to " Battery Protection IC Connection Examples".
1. Normal status
If the voltage of each of the batteries is lower than "the overcharge detection voltage n (V_CUn) + the overcharge
hysteresis voltage n (V_HCn)", the CO pin output changes to "L" (Active "H") or "H" (Active L"). This is called normal
status.
2. Overcharge status
When the voltage of one of the batteries exceeds V_CUn during charging under normal conditions and the status is
retained for the overcharge detection delay time (t_CU) or longer, the CO pin output changes. This is called overcharge
status. Connecting FET to the CO pin provides charge control and a second protection.
If the voltage of each of the batteries is lower than V_CUn + V_HCn and the status is retained for 2.0 ms typ. or longer, the
S-8215A Series changes to normal status.
3. Overcharge timer reset function
When an overcharge release noise that forces the voltage of one of the batteries temporarily below V_CUn is input during
t_CU from when V_CUn is exceeded to when charging is stopped, t_CU is continuously counted if the time the overcharge
release noise persists is shorter than the overcharge timer reset delay time (t_TR). Under the same conditions, if the time
the overcharge release noise persists is t_TR or longer, counting of t_CU is reset once. After that, when V_CUn has been
exceeded, counting t_CU resumes.
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