SSD0817Z(2002) View Datasheet(PDF) - Solomon Systech

Part Name

Description

Manufacturer

SSD0817Z
(Rev.:2002)

LCD Segment / Common Driver with Controller

Solomon Systech  

3. Contrast Control (Voltage referenced to VDD)

Software control of the 64-contrast voltage levels at each voltage regulator feedback gain. The

equation of calculating the LCD driving voltage is given as:

VL6 –VDD = Gain * [1 + (18 + α)] * Vref

81

α stands for the contrast set (0 to 63)

Gain = (1 + Rb/Ra), the reference value is shown in table 5.

Register ratio Thermal Gradient

D2 D1 D0

= -0.07 %/oC

000

2.92

001

3.40

010

3.89

011

4.37

100

4.85

101

5.23

110

5.72

111

6.19

Table 5 - Gain value at different register ratio and thermal gradient settings

Vref is a fixed IC–internal voltage supply and its voltage at room temperature (25 °C) is shown in table 6 for

reference.

Type Thermal Gradient

Vref

TC 0

-0.07 %/oC

-1.08V

TC 2

-0.13 %/oC

-1.12V

TC 4

-0.26 %/oC

-1.09V

TC 7

-0.29 %/oC

-1.10V

Table 6 - Vref values at different thermal gradient settings

The voltage regulator output for different gain/contrast settings is shown in figure 4.

SOLOMON

Figure 4 – Voltage Regulator Output for different Gain/Contrast Settings

Rev 1.0

03/2002

14

SSD0817 Series

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