S-82B1AAA-I6T1U Datasheet, PDF (16/35 Pages) Seiko Instruments Inc – High-accuracy voltage detection circuit

BATTERY PROTECTION IC WITH CHARGE-DISCHARGE CONTROL FUNCTION FOR 1-CELL PACK
S-82B1A Series
Rev.1.1_00
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 VM 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 (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-82B1A 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, VM pin returns to the VSS pin voltage.
When the VM pin voltage returns to V_DIOV1 or lower, the S-82B1A 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-82B1A 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, VM pin returns to the VSS pin voltage.
When the VM pin voltage returns to V_RIOV or lower, the S-82B1A Series releases the discharge overcurrent status.
R_VMD is not connected in the discharge overcurrent status.
4. 3 Release condition of discharge overcurrent status "charger connection"
Under the discharge overcurrent status, VDD pin and VM pin are shorted by R_VMD in the S-82B1A Series.
When a battery is connected to a charger and the VM pin voltage returns to V_DIOV1 or lower, the S-82B1A Series
releases the discharge overcurrent status.
R_VMS is not connected in the discharge overcurrent status.
5. Charge overcurrent status
When a battery in the normal status is in the status where the VM pin voltage is equal to or lower than V_CIOV because the
charge current is equal to or higher than the specified value and the status lasts for the charge overcurrent detection
delay time (t_CIOV) or longer, the charge control FET is turned off and charging is stopped. This status is called the charge
overcurrent status.
The S-82B1A Series releases the charge overcurrent status when the discharge current flows and the VM pin voltage is
0.35 V typ. or higher by removing the charger.
The charge overcurrent detection does not function in the overdischarge status.
6. Charge-discharge inhibition status
6. 1 CTL pin control logic active "H"
When the CTL pin voltage is equal to or higher than CTL pin voltage "H" (V_CTLH) and the status lasts for the charge-
discharge inhibition delay time (t_CTL) or longer, the charge control FET and the discharge control FET are turned off,
and charging and discharging are stopped. This status is called the charge-discharge inhibition status.
The S-82B1A Series releases charge-discharge inhibition status when the CTL pin voltage is equal to or lower than
CTL pin voltage "L" (V_CTLL).
6. 2 CTL pin control logic active "L"
When the CTL pin voltage is equal to or lower than CTL pin voltage "L" (V_CTLL) and the status lasts for the charge-
discharge inhibition delay time (t_CTL) or longer, the charge control FET and the discharge control FET are turned off,
and charging and discharging are stopped. This status is called the charge-discharge inhibition status.
The S-82B1A Series releases charge-discharge inhibition status when the CTL pin voltage is equal to or higher than
CTL pin voltage "H" (V_CTLH).
When the status changes from discharge overcurrent to charge-discharge inhibition, it returns to normal status if
the S-82B1A Series releases charge-discharge inhibition status.The CTL pin is shorted to the VDD pin or VSS pin by the
CTL pin internal resistance (R_CTL) in the S-82B1A Series. When R_CTL becomes overdischarge status, it is disconnected
and the input and output current to the CTL pin is cut off.
The charge-discharge control by the CTL pin does not function in the overdischarge status.
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