S-8230AAD-I6T1U Datasheet, PDF (17/37 Pages) Seiko Instruments Inc – BATTERY PROTECTION IC

Rev.2.5_00
BATTERY PROTECTION IC WITH DISCHARGE CONTROL FUNCTION FOR 1-CELL PACK
S-8230A/B Series
4. Discharge overcurrent status (Discharge overcurrent, 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_DIOV 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_DIOV) 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"
In the discharge overcurrent status, the VM pin and VSS pin are shorted by R_VMS in the S-8230A/B 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 voltage returns to the VSS pin voltage. If the VM pin voltage returns to V_DIOV or
lower, the S-8230A/B Series releases the discharge overcurrent status.
R_VMD is not connected in the discharge overcurrent status.
4. 2 Release condition of discharge overcurrent status "charger connection"
In the discharge overcurrent status, the VM pin and VDD pin are shorted by R_VMD in the S-8230A/B Series.
If the VM pin voltage returns to V_DIOV or lower by connecting a battery charger, the S-8230A/B 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-8230A/B Series releases the charge overcurrent status when the VM pin voltage returns to V_CIOV or higher by
removing the charger.
The charge overcurrent detection does not function in the overdischarge status and the discharge inhibition status.
R_VMD and R_VMS are not connected in the charge overcurrent status.
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