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PCF8531U/2 датащи(PDF) 15 Page - NXP Semiconductors

номер детали PCF8531U/2
подробное описание детали  34 x 128 pixel matrix driver
PDF  44 Pages
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производитель  PHILIPS [NXP Semiconductors]
домашняя страница  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCF8531U/2 датащи(HTML) 15 Page - NXP Semiconductors

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2000 Feb 11
15
Philips Semiconductors
Product specification
34
× 128 pixel matrix driver
PCF8531
handbook, full pagewidth
MGL935
00
01
02
a
VLCD
03
04
05
06
. . . 7D
7E
7F
00
01
02
03
04
05
06
. . . 5F
6F
7F
b
LOW
HIGH
Fig.8 VOP programming of PCF8531.
VOP[6:0] (programmed) [00H to 7FH] programme range LOW and HIGH.
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).
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
PCF8531. The temperature coefficient of VLCD can be
selected from eight values by setting bits TC[2:0]
(see Tables 4, 5 and 6).
handbook, halfpage
MGS473
T
VLCD
0
°C
Fig.9
VLCD as a function of liquid crystal
temperature.



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