S-82A1A Datasheet, PDF (18/44 Pages) Seiko Instruments Inc – BATTERY PROTECTION IC FOR 1-CELL PACK

BATTERY PROTECTION IC FOR 1-CELL PACK
S-82A1A Series
Rev.2.0_01
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-82A1A Series.
When a battery is connected to a charger and the VM pin voltage returns to V_DIOV1 or lower, the S-82A1A 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 VINI 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-82A1A 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. 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 (V_0CHA) 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 V_DL, the S-82A1A Series enters the normal
status.
Caution
1. Some battery providers do not recommend charging for a completely self-discharged lithium-ion
rechargeable 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 V_DL.
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 (V_0INH) or lower, the charge control FET gate is
fixed to the EB− pin voltage to inhibit charging. When the battery voltage is V_0INH or higher, charging can be
performed.
Caution Some battery providers do not recommend charging for a completely self-discharged lithium-ion
rechargeable battery. Please ask the battery provider to determine whether to enable or inhibit the
0 V battery charge function.
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