S-8240ACS-M6T1U Datasheet, PDF (19/45 Pages) Seiko Instruments Inc – BATTERY PROTECTION IC FOR 1-CELL PACK

Rev.2.1_01
BATTERY PROTECTION IC FOR 1-CELL PACK
S-8240A Series
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-8240A Series releases the charge overcurrent status when the VM pin voltage returns to 0 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 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-8240A 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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