PCF88331 Philips Semiconductors, PCF88331 Datasheet - Page 25
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PCF88331
Manufacturer Part Number
PCF88331
Description
STN RGB - 132 X 132 X 3 driver
Manufacturer
Philips Semiconductors
Datasheet
1.PCF88331.pdf
(112 pages)
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Philips Semiconductors
6.2.16
Using the Set contrast command (SETCON) the V
of the VCON[6:0] register on the V
number; see Table 26. An overview over the complete programming range of V
Table 25 Set contrast register bits
Table 26 Possible VCON values
6.2.17
The Display off command (DISPOFF) connects all rows and columns to V
Since the reset state of the PCF8833 is Sleep_IN (see Section 6.2.8) the display will be in the off state after a reset.
The DISPOFF command can be switched off by sending the Display on command (DISPON); see Section 6.2.18.
Figure 7 shows the effects of the combination of commands BSTRON and BSTROFF with DISPON and DISPOFF.
Table 27 Display off register bits
6.2.18
Using the Display on command (DISPON) the rows and columns are driven according to the current display data RAM
content and according to the display timing and settings.
The DISPON command is used to exit the DISPOFF state; see Section 6.2.17.
Figure 4 gives additional information on the effect of the DISPON/DISPOFF command. Figure 7 shows the effects of the
combination of commands BSTRON and BSTROFF with DISPON and DISPOFF.
2003 Feb 14
STN RGB - 132
D/C
D/C
0
1
0
S
D
D
ET CONTRAST
ISPLAY OFF
ISPLAY ON
VCON[6:0]
0111111
0111110
0111101
0000010
0000001
0000000
1111111
1111110
1000010
1000001
1000000
X
7
0
7
0
:
:
VCON
6
0
6
0
132
6
LCD
programming is explained in Section 6.2.31. The VCON[6:0] is a twos complement
VCON
3 driver
5
1
5
1
5
DECIMAL EQUIVALENT
LCD
VCON
4
0
4
0
voltage and the contrast of the LCD can be adjusted. The influence
4
63
62
61
25
2
1
0
62
63
64
:
:
1
2
VCON
3
0
3
1
3
VCON
SS1
2
1
2
0
, i.e. all the pixels have a voltage of 0 V.
LCD
2
can be found in Section 15.1.
VCON
1
0
1
0
V
1
LCD
2520 mV
2480 mV
2440 mV
2480 mV
2520 mV
2560 mV
80 mV
40 mV
Objective specification
0 mV
40 mV
80 mV
VCON
OFFSET
:
:
0
1
0
0
PCF8833
0
DEFAULT
DEFAULT
25H
00H
28H
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