ACEDW01

One Cell Lithium-ion/Polymer Battery Protection IC

VER 1.2

5

Charge Overcurrent Status

When a battery is in the normal status, the voltage of the CS pin is lower than the charge overcurrent

detection voltage (VCIP). When the charge current is higher than the specified value and the status lasts

beyond the charge overcurrent detection delay time (TCIP), the charge control MOSFET will be turned off

and charging is stopped. This status is called the charge overcurrent status.

This IC will be restored to the normal status from the charge overcurrent status when the voltage at the

CS pin returns to charge overcurrent detection voltage (VCIP) or higher by removing the charger.

0V Battery Charging Function “Available”

This function is used to recharge a connected battery which voltage is 0V due to self-discharge. When

the 0V battery charge starting charger voltage (V0V) or a higher voltage is applied between the battery+

(BATT+) and battery- (BATT-) pins by connecting a charger, the charging control MOSFET gate is fixed to

the VCC pin voltage. When the voltage between the gate and the source of the charging control MOSFET

becomes equal to or higher than the turn on voltage due to the charger voltage, the charging control

MOSFET is turned on to initiate charging. At this time, the discharging control MOSFET is off and the

charging current flows through the internal parasitic diode In the discharging control MOSFET. When the

battery voltage becomes equal to or higher than overdischarge detection voltage (VODP), the ACEDW01

series will enter into the normal status.

Caution

A. Some battery providers do not recommend charging for a completely self-discharged battery. Please

ask the battery provider to determine whether to enable or prohibit the 0V battery charging function.

B. The 0V battery charge function has higher priority than the charge overcurrent detection function.

Consequently, a product in which use of the 0V battery charging function is enabled to forcibly

charge a battery and the charge current cannot be detected when the battery voltage is lower than

overdischarge detection voltage (VODP).

0V Battery Charging Function “Unavailable”

When a battery that is internally short-circuited (0V battery) is connected, the unavailable 0V charging

function will prohibit recharging. When the battery voltage equals to the 0V battery charge inhibition

battery voltage (V0IN) or lower, the charging control MOSFET gate is fixed to the BATT- pin voltage to

prohibit charging. When the battery voltage equals to the 0V battery charge inhibition battery voltage

(V0IN) or higher, charging can be implemented.

Caution

A. Some battery providers do not recommend charging for a completely self-discharged battery. Please

ask the battery provider to determine whether to enable or prohibit the 0V battery charging function.