pcf8833 NXP Semiconductors, pcf8833 Datasheet - Page 45

• Manufacturer Part Number: pcf8833
• Description: Stn Rgb - 132 X 132 X 3 Driver
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Table 45 Interface formats
Notes
1. PCF8833 is switched into 256 colour mode,
2. PCF8833 is switched into 4 kbyte colour mode, which
3. PCF8833 is switched into 64 kbyte colour mode, which
6.2.31
The set V
optimum LCD supply voltage V
The reset state of VPR[8:0] is 257DEC (13.88 V).
The optimum LCD supply voltage can be calculated as
explained in Section 6.2.43. The V
via the VPR register. Besides the VPR register the V
value can be calibrated by means of OTP cells or changed
with the VCON register (see Fig.23).
Table 46 Set V
Note
1. X = don’t care.
2003 Feb 14
STN RGB - 132
256 colours are mapped to the 4 kbyte RAM with a
LUT; see Section 6.2.22.
is also the reset state.
is achieved by means of dithering.
D/C
P2
0
1
1
0
0
0
0
1
1
1
1
S
OP
ET
command (SETVOP) is used to program the
V
OP
OP
D7
P1
X
X
1
0
0
1
1
0
0
1
1
register bits; note 1
D6
P0
X
X
0
0
1
0
1
0
1
0
1
132
LCD
OP
.
value is programmed
no action
no action
8-bit/pixel
12-bit/pixel
no action
16-bit/pixel
no action
no action
3 driver
D5
INTERFACE
X
X
1
FORMATS
(1)
(2)
(3)
VPR
D4
OP
X
1
4
45
The generated V
Figure 24 is the graphical equivalent to equation (1).
Where:
The VOP[8:0] value must be in the V
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
mapped to V
programming range of V
As the programming range for the internally generated
V
(20 V) the user has to ensure, while setting the V
register and selecting the temperature compensation, that
under all conditions and including all tolerances the V
remains below 20 V.
V
V
VPR
VPR
OP
LCD
LCD
PR
a is a fixed constant value; see Table 47
b is a fixed constant value; see Table 47
V
programming range for V
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.
D3
0
PR
= 0; resulting V
8:0
allows values above the maximum allowed V
8
3
[8:0] is the programmed V
=
a
+
b
OP
VPR
VPR
MMVOPCAL 5:0
D2
0
= 445. An overview of the complete
LCD
7
2
OP
can be calculated with equation (1).
values higher than 445 will be
LCD
VPR
VPR
D1
0
PR
can be found in Section 15.1.
[8:0] is 5 to 410 (19AH)
6
1
OP
+
VCON 6:0
Objective specification
value; the
LCD
VPR
VPR
D0
0
PCF8833
programming
5
0
+
DEFAULT
PR
B0H
08H
01H
LCD
LCD
(1)