PCF8537 datasheet(30/82 Pages) NXP

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PCF8537

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Product data sheet

Rev. 1 — 31 May 2012

30 of 82

NXP Semiconductors

PCF8537

Industrial LCD driver for multiplex rates up to 1:8

8.4.4.2

Temperature adjustment of the VLCD

Due to the temperature dependency of the liquid crystal viscosity the LCD controlling

voltage VLCD might have to be adjusted at different temperatures to maintain optimal

contrast. The temperature behavior of the liquid comes from the LCD manufacturer. The

slope has to be set to compensate for the liquid behavior. Internal temperature

compensation may be enabled via bit TCE (see Table 9 on page 10).

The ambient temperature range is split up into four equally sized regions and a different

temperature coefficient can be applied to each. Each coefficient can be selected from a

choice of eight different slopes. Each one of these coefficients may be independently

selected (see Table 26).

[1]

Default value.

The slope factors imply a linear correction, however the implementation is in steps of

30 mV.

Table 26.

Temperature coefficients

SLA to SLD register value

Corresponding slope factor, SFA to SFD (mV/

C)

000[1]

001

4

010

8

011

16

100

40

101

110

111

+16

Fig 22. Example of segmented temperature coefficients

Temperature (°C)

-40

-10

013aaa644

TD[7:0]

60h

20h

zero offset

at 20 °C

7Fh

40h

SFC

SFA

SFD

SFB

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