No. 6266-28/37

LC75804E, LC75804W

Sample Application Circuit 2

1/3 duty, 1/2 bias (for use with large panels)

+5.5V

+5V

*9

R

R

C

*11

VDD

S73

COM4/S74

S9

P8/S8

P2/S2

P1/S1

COM3

(P1)

(P2)

(S75)

(S76)

(P8)

COM1

OSC

COM2

DO

DI

CL

*10

RES

CE

VLCD1

VLCD2

VLCD

TEST

VSS

S

7

6

/

K

S

2

S

7

5

/

K

S

1

K

S

3

K

S

4

K

I

1

K

I

2

K

I

3

K

I

4

K

I

5

K

S

5

K

S

6

*11. 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.

From the controller

10 k

Ω ≥ R ≥ 1 kΩ

C

≥ 0.047 µF

(general-purpose output ports)

Used with the backlight

controller or other circuit.

To the controller

To the controller

power supply

Key matrix

(up to 30 keys)