M62244FP

Rev.1.0, Sep.19.2003, page 13 of 17

7. Charging-completed judgement

(1) When fast charging is in progress and the charging current falls below the charging-completed current, charging

stops. One second later, the battery voltage is detected, and the IC performs one of the following operations

according to the detected value.

(a) If the voltage is 3.95 V or more, LED1 is turned off and LED2 is turned on. This indicates the completion of

charging.

(b) If the battery-voltage is 2.6 V or more but below 3.95 V, the IC makes the transition to fast charging.

(c) If the battery-voltage is below 2.6 V, the IC enters the abnormal mode.

(2) When the charging current is not below the charging-completed current 240 minutes after the start of fast

charging, charging stops. One second later, the battery voltage is detected, and the IC performs one of the

following operations according to the detected voltage value.

(a) If the battery-voltage is 3.95 V or more, LED1 is turned off and LED2 is turned. This indicates the

completion of charging.

(b) If the battery-voltage is below 3.95 V, the IC enters the abnormal mode.

8. Recharging

On completion of charging, the IC continues to detect the battery voltage. When the voltage is 3.9 V or less, the

timer is initialized and recharging in the form of fast charging starts up.

9. Detecting abnormality

When a condition in the list below is detected, the IC judges that the current state is abnormal and stops charging

(abnormal mode). Other than as described in item (8) below, the battery or adapter is disconnected and then

connected to make operation resume from the abnormal mode .

(1) The battery voltage is 1.0 V or less after 10 minutes in precharge 1.

(2) The battery voltage is 2.0 V or less after 60 minutes in precharge 1.

(3) Charging in the precharge-2 mode has continued for 60 minutes.

(4) The battery voltage is 2.6 V or less during fast charging.

(5) The battery voltage is 2.6 V or less at charging-completed judgement.

(6) The battery voltage is 4.35 V or more and excessive voltage is detected.

(7) The charging current is 1.5 A or more and excessive current is detected.

(8) The adapter voltage (voltage on the Vcc pin) is 6.3 V or more and excessive adapter-voltage is detected. Note,

however, that when 6.1 V or less is detected, the IC returns to a normal state (adapter-voltage standby H mode).

(9) The battery-voltage is below 1.95 V in the precharge-2 mode.

(10) The battery-voltage is below 3.95 V 240 minutes after the start of fast charging.

10. LED display

State

LED1 (red)

LED2 (green)

Battery disconnected

Off

Off

Charging in progress

On

Off

Charging completed

Off

On

Temperature-standby mode

Off

Off

Adapter-voltage standby L mode

Retains the previous state

Retains the previous state

Adapter-voltage standby H mode

Blinking

Off

Abnormal mode

Blinking

Off

When LED2 (green) is not in use, fixing the LED2 pin to low level selects a blinking period of 0.625 Hz (typ.) for

LED1 (red).

Note: When LED2 (green) is not in use, the LED2 pin must either be pulled up by a resistor or connected to ground.