ST7522

Ver 1.0c

30/45

2002/07/10

The V5 level be generate by OPAmp with VDD-Vcap3 power supply, so that V5 level must to be smaller than Vcap3 over –0.5V.

Fine adjustment must to used EC[5:0] adjust of Electronic contrast set command.

Coarse adjustment must to used jvref[1:0] adjust of Follower input voltage set command.

For V5 voltage level setup formula:

(follower must on of power control command)

(used follower input voltage set and amplified ratio command)

Jvref[1,0]

[1,1]

[1,0]

[0,1]

[0,0]

Rvref

200K

400K

(default)

600K

800K

Rarb2

Rarb1

Rarb0 V5 amplified ratio

0

0

0

2

0

0

1

2.5

0

1

0

3

0

1

1

3.5

1

0

0

4

1

0

1

4.5

1

1

0

5(default)

1

1

1

5.5

0

1

2

3

4

5

6

7

Contrast[5,0]

V5

V4

V3

V2

V1

Test condition:

1.

VDD=3.0V

2.

Booster/Follower=Default set

3.

Bias=1/6

4.

Only master chip

RaRb[2:0]

Electric volumn EC[5:0]

Reference voltage jvref[1:0]

V5

F

(power control command)

[3FH-EC volume] x 20KΩ=REC

The value of Vref is not allowed to be lower than

1.2V within the contrast adjustment range.

Rvref

Rvref