CCFL Backlight and

LCD Contrast Controllers

14

______________________________________________________________________________________

Table 5. Logic-Signal Truth Table

Table 6. Component Suppliers

Hold = maintain last DAC value in counter

Reset = set DAC counter to half scale

Dec = decrement DAC counter one step

Off = section turned off, sleep state

On = section turned on

X = don’t care

LON

LADJ

CON

CADJ

CCFT STATUS

X

X

0

0

Off

X

X

0

1

On

X

X

1

0

On

X

X

1

0

→1

On

LON

LADJ

CON

CADJ

LCD STATUS

0

0

X

X

Off

0

1

X

X

On

1

0

X

X

On

1

0

→1

X

X

On

CCFT DAC

Hold

Reset

Hold

Dec

LCD DAC

Hold

Reset

Hold

Dec

CCF CONTROL

LCD BIAS CONTROL

* Contact John D. Deith, ask for “Maxim Discount” on orders less than 5k units.

MANUFACTURER

ADDRESS

PHONE

FAX

Central Semiconductor

145 Adams Ave.

Hauppauge, NY 11788

(516) 435-1110

(516) 435-1824

Coiltronics

6000 Park of Commerce Blvd.

Boca Raton, FL 33287

(407) 241-7876

(407) 241-9339

Maxim

120 San Gabriel Dr.

Sunnyvale, CA 94025

(408) 737-7600

(408) 737-7194

Nihon (NIEC)*

c/o Quantum Marketing

12900 Rolling Oaks Rd.

Twin Oaks, CA 93518

(805) 867-2555

(805) 867-2698

Sumida

5999 New Wilke Rd., Suite 110

Rolling Meadows, IL 60008

(708) 956-0666

(708) 956-0702

Wima

2269 Saw Mill River Rd., Suite 400

P.O. Box 217

Elmsford, NY 10523

(914) 347-2474

(914) 347-7230

Zetex

(516) 543-7100

(516) 864-7630

87 Modular Ave.

Commack, NY 11725