PCF8811U/2DA/1 NXP [NXP Semiconductors], PCF8811U/2DA/1 Datasheet - Page 49

• Manufacturer Part Number: PCF8811U/2DA/1
• Description: 80 x 128 pixels matrix LCD driver
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
PCF8811_4
Product data sheet
Fig 35. Setting of V
EXT = 1
EXT = 0
12.10.1 Basic command set
12.10 Set V
7 6 5 4 3 2 1 0 2 1 0
OP
Table 25.
For multiplex rate 1:80 the optimum operation voltage of a liquid can be calculated with the
variables given in
Where V
The programming method for the V
command set from that in the extended command set. In the basic command set two
commands are sent to the PCF8811: namely V
command set only one command V
V
for an IAPT (Improved Alt-Pleshko Technique) LCD driver. The ROM look-up table
Table 28
The V
ROM look-up table with the programmed values of V
additionally, be adjusted with the V
performance.
Example: To get the value of 6 V for V
see
Multiplex rate
1:16
1:32
1:48
1:64
1:80
V
in the basic and extended command set
OP
LCD
V
PR
Table
in the basic command set can be used when the PCF8811 is used as a replacement
V
[7:0]
PR
LCD
OP
=
[5:0]
TH
shows the possible values for V
rom_add[8:0]
------ -
at T = T
26.
value
2
Relationship between multiplex rates and bias setting variables with the icon row
(only extended command set)
8
is the threshold voltage of the liquid crystal material used.
V
V
OFF
TH
CUT
Table
[2:0]
LOOK-UP
in the basic command set is determined by the conversion in the
Variable
N
24
40
56
80
80
TABLE
Rev. 04 — 27 June 2008
80
----- -
ROM
25,
2
Equation 1
--------------------------------------- -
81
EXT
–
81 1
LCD
OP
PR
81 80
1
0
–
V
[7:0] is sent to the PCF8811. The programming of
LCD
value is implemented differently in the basic
OP
offset pads V
and
–
[7:0]
OFF
the following values have to be taken;
V
Equation
[2:0], V
OS
=
m
49
49
81
81
81
[4:0]
PR
4.472 V
MMVOPCAL[4:0]
[5:0] and V
PR
OS
PR
2.
[5:0], V
80 x 128 pixels matrix LCD driver
[4:0] to obtain the optimum optical
[5:0] and V
TH
OFF
OP
b
[7:0] and V
[2:0]. In the extended
OFF
p
2
4
8
8
8
a
[2:0]. It can,
PCF8811
© NXP B.V. 2008. All rights reserved.
mgw753
LCD
V
LCD
.
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