ST7522 datasheet(30/45 Pages) SITRONIX

tên linh kiện	ST7522

Giải thích chi tiết về linh kiện	17 x 96 Dot Matrix LCD Controller/Driver

PDF	45 Pages

Scroll/Zoom	100%

nhà sản xuất	SITRONIX [Sitronix Technology Co., Ltd.]

Trang chủ	http://www.sitronix.com.tw

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30 / 45 page

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

2.5

3.5

4.5

5(default)

5.5

Contrast[5,0]

Test condition:

VDD=3.0V

Booster/Follower=Default set

Bias=1/6

Only master chip

RaRb[2:0]

VDD

Vcap3

VDD

VSS

Electric volumn EC[5:0]

Reference voltage jvref[1:0]

VDD

(power control command)

Vref

[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

1M+REC

[] x V5 amp ratio x (VSS-VDD)=V5(±5% range)

Rvref

1M+REC

[] x (VSS-VDD) =Vref

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