PCF2119RU datasheet(10/83 Pages) NXP

Part #	PCF2119RU

Description	LCD controllers/drivers Single-chip LCD controller and driver

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Manufacturer	NXP [NXP Semiconductors]

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10 / 83 page

PCF2119X

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Product data sheet

Rev. 7 — 15 November 2010

10 of 83

NXP Semiconductors

PCF2119x

LCD controllers/drivers

8.4 LCD supply voltage generator

The LCD supply voltage may be generated on-chip. The VLCD generator is controlled by

two internal 6-bit registers: VA and VB. Register VA is programmed with the voltage for

character mode and register VB with the voltage for icon mode.

The nominal LCD operating voltage at room temperature is given by Equation 2:

(2)

Where Vx is the integer value of the register VA or VB.

It should be noted that VLCD is sometimes referred as the LCD operating voltage (Voper).

8.4.1 Programming ranges

Possible values for VA and VB are between 0 to 63.

V

LCD nom

()

V

x

0.08

1.82

+

×

=

Table 5.

Values of VA and VB and the corresponding VLCD values

All values at Tref =27 °C; allowed values are highlighted.

Integer values

of VA and VB

Corresponding

value of VLCD in V

Integer values

of VA and VB

Corresponding

value of VLCD in V

Integer values

of VA and VB

Corresponding

value of VLCD in V

0

VLCD switched off

22

3.58

44

5.34

11.90

23

3.66

45

5.42

21.98

24

3.74

46

5.50

32.06

25

3.82

47

5.58

42.14

26

3.90

48

5.66

5

2.2227

3.9849

5.74

6

2.3028

4.0650

5.82

7

2.3829

4.1451

5.90

8

2.4630

4.2252

5.98

9

2.5431

4.3053

6.06

10

2.62

32

4.38

54

6.14

11

2.70

33

4.46

55

6.22

12

2.78

34

4.54

56

6.30

13

2.86

35

4.62

57

6.38

14

2.94

36

4.70

58

6.46

15

3.02

37

4.78

59

6.54

16

3.10

38

4.86

60

6.62

17

3.18

39

4.94

61

6.70

18

3.26

40

5.02

62

6.78

19

3.34

41

5.10

63

6.86

20

3.42

42

5.18

21

3.50

43

5.26

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