SM5M2 datasheet(23/28 Pages) SHARP

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SM5M2

- 23 -

LCD Function

• Display segment

The SM5M2 contains a built-in circuit which directly

drive a 1/4 duty, 1/2 bias LCD.

A sample LCD pattern is shown in Fig. 14.

S33

S32

S31

S30

S29

S28

Fig. 14

LCD Pattern

A segment of the LCD can be turned on or off by

setting the corresponding bit in the display RAM (see

Fig. 5) to "1" or "0". The displayed segments can

assume any configuration containing up to a

maximum of 136 segments. An example of a 7-

segment numeric display is shown in Fig. 15.

Fig. 15 Sample LCD Pattern for 7-Segment Numeric Display

• LCD drive waveforms

The LCD drive waveforms for the LCD pattern of

Fig. 15 displaying a "5" are shown in Fig. 16 (the

segment output uses S0 and S1). For Fig. 16, 3 V

is applied to the VDD pin, and 1.5 V is applied to

the VOA pin.

VDD (3 V)

VOA (1.5 V)

GND (0 V)

VDD (3 V)

VOA (1.5 V)

GND (0 V)

VDD (3 V)

VOA (1.5 V)

GND (0 V)

VDD (3 V)

VM (1.5 V)

GND (0 V)

VDD (3 V)

VOA (1.5 V)

GND (0 V)

VDD (3 V)

VOA (1.5 V)

GND (0 V)

Fig. 16

LCD Drive Waveforms

(frame frequency = 1/T = 64 Hz or 128 Hz)

∗ Frame frequency is selectable by mask option.

SM5M2 Datasheet(PDF) 23 Page - Sharp Corporation

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