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PCF8531 Datasheet(PDF) 24 Page - NXP Semiconductors

Part # PCF8531
Description  34 x 128 pixel matrix driver
PDF  51 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF8531 Datasheet(HTML) 24 Page - NXP Semiconductors

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PCF8531
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 05 — 10 August 2010
24 of 51
NXP Semiconductors
PCF8531
34 x 128 pixel matrix driver
9.10 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
× V
DD2. The voltage multiplier factors are set
by setting bits S[1:0] (see Table 13).
9.11 Temperature compensation
Due to the temperature dependency of the viscosity of the liquid crystals, the LCD
controlling voltage VLCD should usually be increased at lower temperatures to maintain
optimum contrast. Figure 13 shows VLCD for high multiplex rates.
Table 10.
Parameter values for the HV generator programming
Symbol
Value
Unit
PRS = 0
PRS = 1
Tints
27
27
°C
a
2.94
6.75
V
b
0.03
0.03
V
programming range
2.94 to 6.75
6.75 to 10.56
V
VOP[6:0] (programmed) [00h to 7Fh] program range LOW to HIGH
Fig 12. VLCD programming of PCF8531
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



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