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PCF8566P Datasheet(PDF) 8 Page - NXP Semiconductors

Part # PCF8566P
Description  Universal LCD driver for low multiplex rates
PDF  48 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF8566P Datasheet(HTML) 8 Page - NXP Semiconductors

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PCF8566_7
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 07 — 25 February 2009
8 of 48
NXP Semiconductors
PCF8566
Universal LCD driver for low multiplex rates
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)
Using Equation 3, the discrimination for an LCD drive mode of
• 1:3 multiplex with 1
⁄
2 bias is
Table 5.
Preferred LCD drive modes: summary of characteristics
LCD drive mode Number of:
LCD bias
configuration
Backplanes
Bias 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
–
()
+
--------------------------------------------
=
3
1.732
=



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