pcf8532 NXP Semiconductors, pcf8532 Datasheet - Page 7

• Manufacturer Part Number: pcf8532
• Description: Universal Lcd Driver For Low Multiplex Rates
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCF8532_1
Product data sheet
Using
The advantage of these LCD drive modes is a reduction of the LCD full scale voltage V
as follows:
These compare with
It should be noted that V
----------------------- -
V
V
•
•
•
•
off RMS
on RMS
1:3 multiplex with
1:4 multiplex with
1:3 multiplex (
1:4 multiplex (
Equation
=
------------------------------------------- -
a
a 1
3, the discrimination for an LCD drive mode of
+
–
1
1
1
2
2
V
bias):
bias):
2
2
1
1
Rev. 1 — 10 February 2009
LCD
+
+
2
2
LCD
bias is
bias is
n 1
n 1
V
V
–
=
–
LCD
is sometimes referred as the LCD operating voltage.
LCD
3V
----------
off RMS
=
3
3
21
=
=
--------------------- -
=
6 V
4
1.732
1.528
3
when
Universal LCD driver for low multiplex rates
off RMS
3
=
1
3
2.309V
bias is used.
=
2.449V
off RMS
off RMS
PCF8532
© NXP B.V. 2009. All rights reserved.
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LCD
(3)