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PCF8576D Datasheet(PDF) 9 Page - NXP Semiconductors

Part No. PCF8576D
Description  Universal LCD driver for low multiplex rates
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Maker  NXP [NXP Semiconductors]
Homepage  http://www.nxp.com
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PCF8576D Datasheet(HTML) 9 Page - NXP Semiconductors

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PCF8576D
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 10 — 14 February 2011
9 of 50
NXP Semiconductors
PCF8576D
Universal LCD driver for low multiplex rates
where the values for n are
n = 1 for static mode
n = 2 for 1:2 multiplex
n = 3 for 1:3 multiplex
n = 4 for 1:4 multiplex
The RMS off-state voltage (Voff(RMS)) for the LCD is calculated with Equation 2:
(2)
Discrimination is the ratio of Von(RMS) to Voff(RMS) and is determined from Equation 3:
(3)
Using Equation 3, the discrimination for an LCD drive mode of 1:3 multiplex with
1
2 bias is
and the discrimination for an LCD drive mode of 1:4 multiplex with
1
2 bias is
.
The advantage of these LCD drive modes is a reduction of the LCD full scale voltage VLCD
as follows:
1:3 multiplex (12 bias):
1:4 multiplex (12 bias):
These compare with
when 1
3 bias is used.
It should be noted that VLCD is sometimes referred as the LCD operating voltage.
7.3.1 Electro-optical performance
Suitable values for Von(RMS) and Voff(RMS) are dependant on the LCD liquid used. The
RMS voltage, at which a pixel will be switched on or off, determine the transmissibility of
the pixel.
For any given liquid, there are two threshold values defined. One point is at 10 % relative
transmission (at Vlow) and the other at 90 % relative transmission (at Vhigh), see Figure 5.
For a good contrast performance, the following rules should be followed:
(4)
(5)
Von(RMS) and Voff(RMS) are properties of the display driver and are affected by the selection
of a, n (see Equation 1 to Equation 3) and the VLCD voltage.
V
off RMS
()
a2
2a
n
+
n
1a
+
()
2
×
------------------------------
V
LCD
=
D
V
on RMS
()
V
off RMS
()
-----------------------
a1
+
()
2
n
1
()
+
a1
()
2
n
1
()
+
--------------------------------------------
==
3
1.732
=
21
3
----------
1.528
=
V
LCD
6V
off RMS
()
×
2.449V
off RMS
()
==
V
LCD
43
×
()
3
----------------------
2.309V
off RMS
()
==
V
LCD
3V
off RMS
()
=
V
on RMS
()
V
high
V
off RMS
()
V
low


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