S-8264AAA-I8T1U Datasheet, PDF (16/36 Pages) Seiko Instruments Inc – BATTERY PROTECTION IC FOR 2-SERIAL

BATTERY PROTECTION IC FOR 2-SERIAL TO 4-SERIAL-CELL PACK (SECONDARY PROTECTION)
S-8264A/B/C Series
Rev.4.2_02
3. CTL Pin
The S-8264A/B/C Series has a control pin. The CTL pin is used to control the output voltage of the CO pin.
In the S-8264A/C Series, the CTL pin takes precedence over the overcharge detection circuit.
In the S-8264B Series, when the CTL pin is switched from “L” to “H”, a reset signal is output to the overcharge detection
latch and CO becomes “L”.
Table 13 Control via CTL Pin
CTL Pin
“H”
Open
“L”
“L”→“H”
“H”→“L”
S-8264A Series
Normal state^*1
“H”
“H”
−
−
CO Pin
S-8264B Series
Without latch
Normal state^*1
Normal state^*1
Latch reset^*2
−
S-8264C Series
Normal state^*1
Normal state^*1
“H”
−
−
*1. The state is controlled by the overcharge detection circuit.
*2. Latch reset becomes effective when the voltage of each of the batteries is lower than the overcharge detection
voltage (VCU) + the overcharge hysteresis voltage (VHC) and the overcharge release delay time (tCL) has
elapsed.
–
CTL ^*1
+
Pull-down resistor
–
CTL ^*1
+
Pull-up resistor
S-8264A/B Series
S-8264C Series
*1. The reverse voltage “H” to “L” or “L” to “H” of CTL pin is VDD pin voltage − 2.8 V (Typ.), does not have the
hysteresis.
Figure 8 Internal Equivalent Circuit of CTL Pin
Caution
1. In the S-8264A/B Series, since the CTL pin implements high resistance of 8 MΩ to 12 MΩ for
pull down, be careful of external noise application. If an external noise is applied, CO may
become “H”. Perform thorough evaluation using the actual application.
2. In the S-8264B Series, when the CTL pin is open or “L”, CO latches “H”. When the VDD pin
voltage is decreased to the UVLO voltage of 2 V (Typ.) or lower, the latch is reset.
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