SSD1811 データシートの表示（PDF） - Solomon Systech

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SSD1811

LCD Segment / Common Driver with Controller

Solomon Systech  

3. Contrast Control (Voltages 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:

where

and

VL6 −VDD = Gain∗ (1 + Contrast) ∗Vref

β

Vref = (VBE + R ∗ (VDD −VSS) )

1+ R

Int.Reg.Resistor 0 1 2 3 4 5 6 7 Ext.

Ratio Setting

Resistor

Gain

-3.36 -3.84 -4.38 -4.93 -5.50 -5.89 -6.54 -7.10 -(1+R2/R1)

β

90.54 89.95 89.32 88.69 88.04 87.59 86.77 86.01 96.68

TC

0

2

4

7

(-0.01%/°C) (-0.10%/°C) (-0.18%/°C) (-0.25%/°C)

VBE

0.025

0.523

0.520

0.517

R

0.72

0.423

0.272

0.121

*Note: There may be a calculation error of max. 6% when comparing with measurement values.

-3

0

-5

-7

-9

-11

-13

-15

VL6 vs Contrast Settings

10

20

30

40

50

60

contrast level at VDD = 2.775V

Figure 6 Voltage Regulator Output for Different Gain/Contrast Settings

SSD181X Series

13

Rev 3.1

08/2001

20

21

22

23

24

25

26

27

SOLOMON

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