MSM6544

¡ Semiconductor

3/12

PIN DESCRIPTIONS

• OSC-IN, OSC-C, OSC-R

An RC oscillator circuit for 3-pin type can be configured. Since the OSC-IN pin is in a high

input impedance state, it is susceptible to noise.

• DATA-IN

This is the display data input. When this pin is at "H" level, the segments are turned on and

when at "L" level, the segments are turned off.

• CLOCK

Pin for clocking display data in. Display data is shifted on the rising edge of the clock pulse.

• LOAD

This is the signal for latching the shift register data. When this pin is set at a "H" level, the shift

register data is transmitted to LATCH <A> or LATCH <B>.

• SEG1 - SEG42

These pins drive the LCD segments.

• COM-A, COM-B

These pins drive the LCD commons. COM-A and COM-B correspond to LATCH <A> output

and LATCH <B>output, respectively.

This is the power supply pin of the LCD driver. The contrast of the LCD can be adjusted by

changing the voltage at this pin, but do not set the voltage less than the GND level.

• BLANK

turned off when this pin is set to "H" level. The display returns to the condition before the pin

was set to "H" level.

These are power supply voltage and ground pins.