s-8261aaj Seiko Instruments Inc., s-8261aaj Datasheet - Page 19

• Manufacturer Part Number: s-8261aaj
• Description: Battery Protection Ic For 1-cell Pack
• Manufacturer: Seiko Instruments Inc.

Rev.4.6
4. Overdischarge Status
5. Charger Detection
6. Abnormal Charge Current Detection
For products with power-down function
For products without power-down function
When the battery voltage falls below the overdischarge detection voltage (V
status and the detection continues for the overdischarge detection delay time (t
the discharging control FET off to stop discharging.
discharging control FET is turned off, the VM pin voltage is pulled up by the resistor between VM and VDD in the IC
(R
is reduced to the power-down current consumption (I
The power-down status is released when a charger is connected and the voltage difference between the VM and VDD
becomes 1.3 V (typ.) or higher. Moreover when the battery voltage becomes the overdischarge detection voltage
(V
When the battery voltage falls below the overdischarge detection voltage (V
status and the detection continues for the overdischarge detection delay time (t
the discharging control FET off to stop discharging.
discharging control FET is turned off, the VM pin voltage is pulled up by the resistor between VM and VDD in the IC
(R
When the battery voltage becomes the overdischarge detection voltage (V
discharging FET on and returns to the normal status.
When a battery in the overdischarge status is connected to a charger and provided that the VM pin voltage is lower
than the charger detection voltage (V
discharging control FET on when the battery voltage becomes equal to or higher than the overdischarge detection
voltage (V
When a battery in the overdischarge status is connected to a charger and provided that the VM pin voltage is not lower
than the charger detection voltage (V
voltage reaches the overdischarge detection voltage (V
If the VM pin voltage falls below the charger detection voltage (V
continues for the overcharge detection delay time (t
This action is called the abnormal charge current detection.
Abnormal charge current detection works when the DO pin voltage is “H” and the VM pin voltage falls below the
charger detection voltage (V
the S-8261 Series turns the charging control FET off and stops charging after the battery voltage becomes higher than
the overdischarge detection voltage which make the DO pin voltage “H”, and still after the overcharge detection delay
time (t
Abnormal charge current detection is released when the voltage difference between VM pin and VSS pin becomes less
than charger detection voltage (V
DL
VMD
VMD
) or higher, the S-8261 Series turns the discharging FET on and returns to the normal status.
_00
). When the voltage difference between the VM and VDD then is 1.3 V (typ.) or lower, the current consumption
).
CU
) elapses.
DL
) since the charger detection function works. This action is called charger detection.
CHA
). Consequently, if an abnormal charge current flows to an over-discharged battery,
CHA
).
CHA
CHA
), the S-8261 Series releases the overdischarge status when the battery
Seiko Instruments Inc.
), the S-8261 Series releases the overdischarge status and turns the
BATTERY PROTECTION IC FOR 1-CELL PACK
CU
PDN
) or longer, the charging control FET turns off and charging stops.
DL
). This status is called the power-down status.
)
This status is called the overdischarge status.
This status is called the overdischarge status.
overdischarge hysteresis (V
CHA
) during charging under normal status and it
DL
DL
DL
) or higher, the S-8261 Series turns the
) during discharging under the normal
) during discharging under the normal
DL
DL
) or longer, the S-8261 Series turns
) or longer, the S-8261 Series turns
HD
) or higher.
S-8261 Series
When the
When the
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