pcf8531 NXP Semiconductors, pcf8531 Datasheet - Page 15

• Manufacturer Part Number: pcf8531
• Description: 34 X 128 Pixel Matrix Driver
• Manufacturer: NXP Semiconductors

Philips Semiconductors
8.18.10 V
The PCF8531 incorporates a software configurable
voltage multiplier. After reset (internal or external), the
voltage multiplier is set to 2
factors are set via the command ‘HV-gen configuration’
(see Tables 4, 5 and 6).
8.18.11 T
Due to the temperature dependency of the liquid crystal’s
viscosity, the LCD controlling voltage V
be increased at lower temperatures to maintain optimum
contrast. Figure 9 shows V
Linear temperature compensation is supported in the
PCF8531. The temperature coefficient of V
selected from eight values by setting bits TC[2:0]
(see Tables 4, 5 and 6).
2000 Feb 11
handbook, full pagewidth
34
V
OP
[6:0] (programmed) [00H to 7FH] programme range LOW and HIGH.
V LCD
128 pixel matrix driver
EMPERATURE COMPENSATION
OLTAGE MULTIPLIER CONTROL
00
a
01
b
02
LCD
03
V
for high multiplex rates.
DD2
04
. The voltage multiplier
LOW
05
S[1:0]
LCD
06
Fig.8 V
should usually
LCD
. . .
can be
7D
OP
programming of PCF8531.
7E
7F
15
00
handbook, halfpage
01
Fig.9
V LCD
02
V
temperature.
03
LCD
04
as a function of liquid crystal
HIGH
05
06
0 C
. . .
5F
6F
Product specification
MGL935
7F
PCF8531
MGS473
T