S-82A1A Datasheet, PDF (17/44 Pages) Seiko Instruments Inc – BATTERY PROTECTION IC FOR 1-CELL PACK

Rev.2.0_01
BATTERY PROTECTION IC FOR 1-CELL PACK
S-82A1A Series
3. Overdischarge status
When the battery voltage falls below V_DL during discharging in the normal status and the condition continues for the
overdischarge detection delay time (t_DL) or longer, the S-82A1A Series turns the discharge control FET off to stop
discharging. This condition is called the overdischarge status.
Under the overdischarge status, VDD pin and VM pin are shorted by R_VMD in the S-82A1A Series. The VM pin voltage
is pulled up by R_VMD.
When connecting a charger in the overdischarge status, the battery voltage reaches V_DL or higher and the S-82A1A
Series releases the overdischarge status if the VM pin voltage falls below 0 V typ.
The battery voltage reaches the overdischarge release voltage (V_DU) or higher and the S-82A1A Series releases the
overdischarge status if the VM pin voltage does not fall below 0 V typ.
R_VMS is not connected in the overdischarge status.
3. 1 With power-down function
Under the overdischarge status, when voltage difference between VDD pin and VM pin is 0.8 V typ. or lower, the
power-down function works and the current consumption is reduced to the current consumption during power-
down (I_PDN). By connecting a battery charger, the power-down function is released when the VM pin voltage is
0.7 V typ. or lower.
• When a battery is not connected to a charger and the VM pin voltage ≥ 0.7 V typ., the S-82A1A Series
maintains the overdischarge status even when the battery voltage reaches V_DU or higher.
• When a battery is connected to a charger and 0.7 V typ. > the VM pin voltage > 0 V typ., the battery voltage
reaches V_DU or higher and the S-82A1A Series releases the overdischarge status.
• When a battery is connected to a charger and 0 V typ. ≥ the VM pin voltage, the battery voltage reaches V_DL or
higher and the S-82A1A Series releases the overdischarge status.
3. 2 Without power-down function
The power-down function does not work even when voltage difference between VDD pin and VM pin is 0.8 V typ.
or lower.
• When a battery is not connected to a charger and the VM pin voltage ≥ 0.7 V typ., the battery voltage reaches
V_DU or higher and the S-82A1A Series releases the overdischarge status.
• When a battery is connected to a charger and 0.7 V typ. > the VM pin voltage > 0 V typ., the battery voltage
reaches V_DU or higher and the S-82A1A Series releases the overdischarge status.
• When a battery is connected to a charger and 0 V typ. ≥ the VM pin voltage, the battery voltage reaches V_DL or
higher and the S-82A1A Series releases the overdischarge status.
4. Discharge overcurrent status (discharge overcurrent 1, discharge overcurrent 2, load short
circuiting)
When a battery in the normal status is in the status where the VINI pin voltage is equal to or higher than V_DIOV1
because the discharge current is equal to or higher than the specified value and the status lasts for the discharge
overcurrent detection delay time 1 (t_DIOV1) or longer, the discharge control FET is turned off and discharging is
stopped. This status is called the discharge overcurrent status.
4. 1 Release condition of discharge overcurrent status "load disconnection" and release voltage of
discharge overcurrent status "V_DIOV1"
Under the discharge overcurrent status, VM pin and VSS pin are shorted by R_VMS in the S-82A1A Series.
However, the VM pin voltage is the VDD pin voltage due to the load as long as the load is connected. When the
load is disconnected, the VM pin returns to the VSS pin voltage. When the VM pin voltage returns to V_DIOV1 or
lower, the S-82A1A Series releases the discharge overcurrent status.
R_VMD is not connected in the discharge overcurrent status.
4. 2 Release condition of discharge overcurrent status "load disconnection" and release voltage of
discharge overcurrent status "V_RIOV"
Under the discharge overcurrent status, VM pin and VSS pin are shorted by R_VMS in the S-82A1A Series.
However, the VM pin voltage is the VDD pin voltage due to the load as long as the load is connected. When the
load is disconnected, the VM pin returns to the VSS pin voltage. When the VM pin voltage returns to V_RIOV or
lower, the S-82A1A Series releases the discharge overcurrent status.
R_VMD is not connected in the discharge overcurrent status.
17