PCF2119AU/2DA/2 Просмотр технического описания (PDF) - NXP Semiconductors.
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PCF2119AU/2DA/2 Datasheet PDF : 83 Pages
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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:
VLCD(nom) = Vx × 0.08 + 1.82
(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.
Table 5. Values of VA and VB and the corresponding VLCD values
All values at Tref = 27 °C; allowed values are highlighted.
Integer values Corresponding
of VA and VB value of VLCD in V
Integer values Corresponding
of VA and VB value of VLCD in V
0
VLCD switched off 22
3.58
1
1.90
23
3.66
2
1.98
24
3.74
3
2.06
25
3.82
4
2.14
26
3.90
5
2.22
27
3.98
6
2.30
28
4.06
7
2.38
29
4.14
8
2.46
30
4.22
9
2.54
31
4.30
10
2.62
32
4.38
11
2.70
33
4.46
12
2.78
34
4.54
13
2.86
35
4.62
14
2.94
36
4.70
15
3.02
37
4.78
16
3.10
38
4.86
17
3.18
39
4.94
18
3.26
40
5.02
19
3.34
41
5.10
20
3.42
42
5.18
21
3.50
43
5.26
Integer values
of VA and VB
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
Corresponding
value of VLCD in V
5.34
5.42
5.50
5.58
5.66
5.74
5.82
5.90
5.98
6.06
6.14
6.22
6.30
6.38
6.46
6.54
6.62
6.70
6.78
6.86
PCF2119X
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 9 — 14 April 2011
© NXP B.V. 2011. All rights reserved.
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