PCF8811MU/2DA/1 PHILIPS [NXP Semiconductors], PCF8811MU/2DA/1 Datasheet - Page 40

• Manufacturer Part Number: PCF8811MU/2DA/1
• Description: 80 x 128 pixels matrix LCD driver
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
13.11 Temperature control
Due to the temperature dependency of the liquid crystals
viscosity the LCD controlling voltage V
be increased at lower temperature to maintain optimum
contrast.
The V
for both command sets. V
equations (4) or (5), depending on the command set which
is used.
In the extended command set and basic command set
8 different temperature coefficients are available (see
Fig.34). The typical values of the different temperature
coefficients are given in Chapter 16. The coefficients are
proportional to the programmed V
The basic and extended command set differ in the way that
the temperature coefficients can be accessed. In the basic
command set only one temperature coefficient is
available. However, the possibility exists to program the
default temperature coefficient by means of OTP
programming; see Chapter 22. In the extended command
set the different temperature coefficients are selected by
the interface with three bits TC[2:0].
2004 May 17
handbook, full pagewidth
80
V
V
OP
LCD
LCD
[7:0] programming, (00H to FFH).
V LCD
T
at a specific temperature is calculated as follows
128 pixels matrix LCD driver
=
00
V
a
LCD
01
b
T
=
02
T
CUT
LCD
03
(at T = T
1
04
+
LCD
T T
05
–
.
LCD
CUT
06
Fig.33 V
CUT
) is given by
. . .
might have to
TC
LCD
programming of PCF8811.
(6)
40
handbook, halfpage
V LCD
Fig.34 Temperature coefficients.
. . .
T CUT
FD
FE
Product specification
FF
MGT847
PCF8811
V OP
MGW754
T