s-8264a Seiko Instruments Inc., s-8264a Datasheet - Page 13

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

Rev.2.0
3. CTL Pin
The S-8264A/B Series has a control pin. The CTL pin is used to control the output voltage of the CO pin.
In the S-8264A 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”.
*1. The state is controlled by the overcharge detection circuit.
*2. Latch reset becomes effective when the voltages of all the batteries are lower than the total of the overcharge
*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
Cautions 1. Since the CTL pin implements high resistance of 8 MΩ to 12 MΩ for pull down, be careful of
_00
detection voltage (V
(t
hysteresis.
CL
“L” → “H”
“H” → “L”
) has elapsed.
CTL Pin
Open
BATTERY PROTECTION IC FOR 2-SERIAL TO 4-SERIAL-CELL PACK (SECONDARY PROTECTION)
2. In the S-8264B Series, when the CTL pin is open or “L”, CO latches “H”. When the VDD pin
“H”
“L”
external noise application. If an external noise is applied, CO may become “H”. Perform
thorough evaluation using the actual application.
voltage is decreased to the UVLO voltage of 2 V (Typ.) or lower, the latch is reset.
CU
CTL
) and the overcharge hysteresis voltage (V
Figure 7 Internal Equivalent Circuit of CTL Pin
Pull-down resistor
*1
Table 9 Control via CTL Pin
S-8264A Series
Normal state
Seiko Instruments Inc.
“H”
“H”
−
−
*1
CO Pin
+
–
S-8264B Series
Normal state
Normal state
Without latch
Latch reset
HC
) and the overcharge release delay time
−
*2
*1
*1
S-8264A/B Series
13