PCF8811USLASH2DASLASH1 datasheet(40/73 Pages) PHILIPS

40 / 73 page

2004 May 17

Philips Semiconductors

Product speciﬁcation

× 128 pixels matrix LCD driver

PCF8811

handbook, full pagewidth

MGT847

VLCD

VOP

. . .

. . . FD FE FF

Fig.33 VLCD programming of PCF8811.

VOP[7:0] programming, (00H to FFH).

13.11 Temperature control

Due to the temperature dependency of the liquid crystals

viscosity the LCD controlling voltage VLCD might have to

be increased at lower temperature to maintain optimum

contrast.

The VLCD at a specific temperature is calculated as follows

for both command sets. VLCD (at T = TCUT) is given by

equations (4) or (5), depending on the command set which

is used.

(6)

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 VLCD.

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].

LCD

()

LCD

CUT

()

CUT

–

() TC

[]

handbook, halfpage

MGW754

VLCD

TCUT

Fig.34 Temperature coefficients.

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