PCF8531 Ver la hoja de datos (PDF) - Philips Electronics

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Fabricante

PCF8531

34 × 128 pixel matrix driver

Philips Electronics 

Philips Semiconductors

34 × 128 pixel matrix driver

handbook, full pagewidth

VLCD

Product specification

PCF8531

b

a

00 01 02 03 04 05 06 . . . 7D 7E 7F 00 01 02 03 04 05 06 . . . 5F 6F 7F

LOW

HIGH

MGL935

VOP[6:0] (programmed) [00H to 7FH] programme range LOW and HIGH.

Fig.8 VOP programming of PCF8531.

8.18.10 VOLTAGE MULTIPLIER CONTROL S[1:0]

The PCF8531 incorporates a software configurable

voltage multiplier. After reset (internal or external), the

voltage multiplier is set to 2 × VDD2. The voltage multiplier

factors are set via the command ‘HV-gen configuration’

(see Tables 4, 5 and 6).

handbook, halfpage

VLCD

8.18.11 TEMPERATURE COMPENSATION

Due to the temperature dependency of the liquid crystal’s

viscosity, the LCD controlling voltage VLCD should usually

be increased at lower temperatures to maintain optimum

contrast. Figure 9 shows VLCD for high multiplex rates.

Linear temperature compensation is supported in the

0 °C

PCF8531. The temperature coefficient of VLCD can be

selected from eight values by setting bits TC[2:0]

(see Tables 4, 5 and 6).

MGS473

T

Fig.9 VLCD as a function of liquid crystal

temperature.

2000 Feb 11

15

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