No. 7135-21/24

LC75863E, 75863W

Sample Application Circuit 4

1/3 bias (for use with large panels)

To the controller

power supply

To the controller

From the

controller

(general-purpose

output ports)

Key matrix

(up to 30 keys)

10 k

Ω ≥ R ≥ 1 kΩ

C

≥ 0.047 µF

+5.5 V

+5 V

VDD

S23

S5

P4/S4

P3/S3

P2/S2

P1/S1

COM3

(P1)

(P2)

(P3)

(S24)

(S25)

(P4)

COM1

OSC

COM2

DO

DI

CL

*8

C

C

R

R

R

*9

CE

VLCD1

VLCD2

VLCD

TEST

VSS

S

2

5

/

K

S

2

S

2

4

/

K

S

1

K

S

3

K

S

5

K

S

4

K

I

1

K

I

2

K

I

3

K

I

4

K

I

5

K

S

6

Used with the

backlight controller

or other circuit.

Note: *8.

*9.

The DO pin, being an open-drain output, requires a pull-up resistor. Select a resistance (between 1 to 10 k

Ω) appropriate for the capacitance of

the external wiring so that signal waveforms are not degraded.

Notes on transferring display data from the controller

The display data (D1 to 75) is transferred to the LC75863E/W in two operations. All of the display data should be

transferred within 30 ms to maintain the quality of the displayed image.