S-8200AAC-M6T1U Datasheet, PDF (16/36 Pages) Seiko Instruments Inc – BATTERY PROTECTION IC FOR 1-CELL PACK

BATTERY PROTECTION IC FOR 1-CELL PACK
S-8200A Series
Rev.4.0_02
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 VDIOV because
the discharge current is equal to or higher than the specified value and the status lasts for the discharge overcurrent
detection delay time (tDIOV), the discharge control FET is turned off and discharging is stopped. This status is called the
discharge overcurrent status.
In the discharge overcurrent status, the VM pin and VSS pin are shorted by the RVMS in the S-8200A 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.
The VM pin voltage returns to VDIOV or lower, the S-8200A Series releases the discharge overcurrent status.
RVMD 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 VCIOV because the
charge current is equal to or higher than the specified value and the status lasts for the charge overcurrent detection
delay time (tCIOV), the charge control FET is turned off and charging is stopped. This status is called the charge
overcurrent status.
The S-8200A Series releases the charge overcurrent status when the VM pin voltage returns to VCIOV or higher by
removing the charger.
The charge overcurrent detection function does not work in the overdischarge status.
RVMD and RVMS are not connected in the charge overcurrent status.
6. 0 V battery charge function "available"
This function is used to recharge a connected battery whose voltage is 0 V due to self-discharge. When the 0 V battery
charge starting charger voltage (V0CHA) or a higher voltage is applied between the EB+ and EB− pins by connecting a
charger, the charge control FET gate is fixed to the VDD pin voltage.
When the voltage between the gate and source of the charge control FET becomes equal to or higher than the threshold
voltage due to the charger voltage, the charge control FET is turned on to start charging. At this time, the discharge
control FET is off and the charging current flows through the internal parasitic diode in the discharging control FET.
When the battery voltage becomes equal to or higher than VDU, the S-8200A Series enters the normal status.
Caution
1. Some battery providers do not recommend charging for a completely self-discharged battery.
Please ask the battery provider to determine whether to enable or inhibit the 0 V battery charge
function.
2. The 0 V battery charge function has higher priority than the charge overcurrent detection function.
Consequently, a product in which use of the 0 V battery charge function is enabled charges a
battery forcibly and the charge overcurrent cannot be detected when the battery voltage is lower
than VDL.
7. 0 V battery charge function "unavailable"
This function inhibits recharging when a battery that is internally short-circuited (0 V battery) is connected. When the
battery voltage is the 0 V battery charge inhibition battery voltage (V0INH) or lower, the charge control FET gate is fixed to
the EB− pin voltage to inhibit charging. When the battery voltage is V0INH or higher, charging can be performed.
Caution Some battery providers do not recommend charging for a completely self-discharged battery. Please
ask the battery provider to determine whether to enable or inhibit the 0 V battery charge function.
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