參數(shù)資料
型號(hào)： PCF88331
廠商： NXP Semiconductors N.V.
英文描述： STN RGB - 132 X 132 X 3 driver
中文描述： 超扭曲的RGB - 132 × 132 × 3驅(qū)動(dòng)程序
文件頁(yè)數(shù)： 45/112頁(yè)
文件大?。?/td> 469K
代理商： PCF88331
2003 Feb 14
45
Philips Semiconductors
Objective specification
STN RGB - 132
×
132
×
3 driver
PCF8833
Table 45
Interface formats
Notes
1.
PCF8833 is switched into 256 colour mode,
256 colours are mapped to the 4 kbyte RAM with a
LUT; see Section 6.2.22.
PCF8833 is switched into 4 kbyte colour mode, which
is also the reset state.
PCF8833isswitchedinto64 kbytecolourmode,which
is achieved by means of dithering.
2.
3.
6.2.31
S
ET
V
OP
The set V
OP
command (SETVOP) is used to program the
optimum LCD supply voltage V
LCD
.
The reset state of VPR[8:0] is 257DEC (13.88 V).
The optimum LCD supply voltage can be calculated as
explainedinSection 6.2.43.TheV
OP
valueisprogrammed
via the VPR register. Besides the VPR register the V
OP
value can be calibrated by means of OTP cells or changed
with the VCON register (see Fig.23).
The generated V
LCD
can be calculated with equation (1).
Figure 24 is the graphical equivalent to equation (1).
V
LCD
a
MMVOPCAL 5:0
V
PR
8:0
[
]
b
×
(1)
Where:
a is a fixed constant value; see Table 47
b is a fixed constant value; see Table 47
V
PR
[8:0] is the programmed V
OP
value; the
programming range for V
PR
[8:0] is 5 to 410 (19AH)
MMVOPCAL[5:0] is the value of the offset stored in the
OTP cells in twos complement format; see Section 15.1
VCON[6:0] is the set contrast value which can be set via
the interface and is in twos complement format; see
Section 6.2.16.
The VOP[8:0] value must be in the V
LCD
programming
range as shown in Fig.24. Evaluating equation (1), values
outside of the programming range indicated in Fig.24 may
result. Calculated values below 0 will be mapped to
V
OP
= 0; resulting V
OP
values higher than 445 will be
mapped to V
OP
= 445. An overview of the complete
programming range of V
LCD
can be found in Section 15.1.
As the programming range for the internally generated
V
LCD
allows values above the maximum allowed V
LCD
(20 V) the user has to ensure, while setting the V
PR
register and selecting the temperature compensation, that
under all conditions and including all tolerances the V
LCD
remains below 20 V.
P2
P1
P0
INTERFACE
FORMATS
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
no action
no action
8-bit/pixel
(1)
12-bit/pixel
(2)
no action
16-bit/pixel
(3)
no action
no action
]
VCON 6:0
]
+
+
+
=
Table 46
Set V
OP
register bits; note 1
Note
1.
X = don’t care.
D/C
D7
D6
D5
D4
D3
D2
D1
D0
DEFAULT
0
1
1
1
X
X
0
X
X
1
X
X
1
X
0
0
0
0
B0H
08H
01H
VPR
8
VPR
3
VPR
7
VPR
2
VPR
6
VPR
1
VPR
5
VPR
0
VPR
4
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