M62244FP

Rev.1.0, Sep.19.2003, page 2 of 17

Description of pins

Protection diode

No.

Pin

name

I/O

Function

Positive

Negative

18

Vcc



Power-supply input



gnd1

16

LED1

O

LED drive

Vcc

gnd2

17

LED2

I/O

LED drive (with function for switching the LEDs’ blinking period)

The blinking period of LED1 is set to 0.6 Hz (typ.) by fixing this signal

low.

Vcc

gnd2

15

GND2



Ground for power supply





9

STP

I

Forcible charge OFF

H (or open): Charging possible, L: Charging stopped

Vcc

gnd1

8

COSC



For connection to the capacitor used to set the oscillator circuit’s

frequency

Vcc

gnd1

12

GND1



Ground





5

Tdet

I

Battery-temperature detection

Vcc

gnd1

10

Vref

O

Reference power-supply output

Vcc

gnd1

6

Vrchg

I

Adjustment of start-recharging voltage

The pin voltage is set to 1.0 V (typ.). The voltage at which recharging

starts (threshold) may be changed by using an external resistor etc. to

adjust the voltage on this pin. The actual voltage is the voltage on this

pin multiplied by 11.8 dB.

Vcc

gnd1

20

Idet1

I



gnd1

1

Idet2

I

Charging-current detection

The drop in voltage across an external resistor RS (connected between

these pins) reflects the size of the charging current and is used to detect

the completion of charging.

2

Vsense

I/O

Battery-voltage detection

Detects the battery-voltage value for use in charging control.



gnd1

7

Ifull

I

Charging-completed current switching

Select the current taken as indicating the completion of charging by

leaving this pin open or connecting it to ground. The charging-completed

current is controlled by comparing the voltage on the Ifull pin with the

level 12 dB above the voltage drop between Idet1 and Idet2.

Vcc

gnd1

13

C1



Compensation for the charge-control phase

A capacitor between C1 and ground improves the stability of oscillation

during charging at constant current and constant voltage.

Vcc

gnd1

14

C2



For connection of a capacitor that comes into play during switching of

the charging current

Reduces overshooting of the charging current when the charging current

is switched.

Vcc

gnd1

19

CTRL

O

Output for charge control

Controls the base (gate of a p-ch transistor) of an external pnp transistor

so that constant-current or constant-voltage charging is applied.



gnd2

3

Vadp1

I

For adjusting the adapter-detection voltage 1 (detection voltage when

charging has stopped)

Pin-voltage is set to 1.0 V (typ.). The value to be taken as adapter-

detection voltage 1 is controlled by using an external resistor etc. to

adjust the voltage on this pin. The actual voltage is the voltage on this

pin multiplied by 14.3.

Vcc

gnd1

4

Vadp2

I

For adjusting the adapter-detection voltage 2 (detection voltage during

charging)

Pin-voltage is set to 1.0 V (typ.). The value to be taken as adapter-

detection voltage 2 is controlled by using an external resistor etc. to

adjust the voltage on this pin. The actual voltage is the voltage on this

pin multiplied by 13.9dB.

Vcc

gnd1

11

Vcvref

O

Reference voltage for constant-voltage control

Vcc

gnd1