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PCF8562 Datasheet(PDF) 7 Page - NXP Semiconductors

Part # PCF8562
Description  Universal LCD driver for low multiplex rates
PDF  36 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF8562 Datasheet(HTML) 7 Page - NXP Semiconductors

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PCF8562_4
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 04 — 18 March 2009
7 of 36
NXP Semiconductors
PCF8562
Universal LCD driver for low multiplex rates
configurations that apply to the preferred modes of operation, together with the biasing
characteristics as functions of VLCD and the resulting discrimination ratios (D), are given in
Table 5.
A practical value for VLCD is determined by equating Voff(RMS) with a defined LCD
threshold voltage (Vth), typically when the LCD exhibits approximately 10 % contrast. In
the static drive mode a suitable choice is VLCD >3Vth.
Multiplex drive modes of 1:3 and 1:4 with 1
⁄2 bias are possible but the discrimination and
hence the contrast ratios are smaller.
Bias is calculated by
, where the values for a are
a = 1 for 1
⁄2 bias
a = 2 for 1
⁄3 bias
The RMS on-state voltage (Von(RMS)) for the LCD is calculated with the equation
(1)
where VLCD is the resultant voltage at the LCD segment and 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 the equation:
(2)
Discrimination is the ratio of Von(RMS) to Voff(RMS) and is determined from the equation:
(3)
Table 5.
Discrimination ratios
LCD drive
mode
Number of:
LCD bias
configuration
Backplanes
Levels
static
1
2
static
0
1
∞
1:2 multiplex
2
3
1
⁄
2
0.354
0.791
2.236
1:2 multiplex
2
4
1
⁄
3
0.333
0.745
2.236
1:3 multiplex
3
4
1
⁄
3
0.333
0.638
1.915
1:4 multiplex
4
4
1
⁄
3
0.333
0.577
1.732
V
off RMS
()
V
LCD
--------------------------
V
on RMS
()
V
LCD
-------------------------
D
V
on RMS
()
V
off RMS
()
--------------------------
=
1
1a
+
-------------
V
on RMS
()
1
n
---
n
1
–
()
1
1a
+
-------------


×
2
+
n
------------------------------------------------------------
V
LCD
=
V
off RMS
()
a
2
2a
n
+
()
–
n
1a
+
()
2
×
---------------------------------
V
LCD
=
V
on RMS
()
V
off RMS
()
------------------------
a1
+
()
2
n
1
–
()
+
a1
–
()
2
n
1
–
()
+
--------------------------------------------
=



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