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PCF8534AHL/1 数据表(PDF) 9 Page - NXP Semiconductors

部件名 PCF8534AHL/1
功能描述  Universal LCD driver for low multiplex rates
PDF  47 Pages
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制造商  NXP [NXP Semiconductors]
网页  http://www.nxp.com
标志 NXP - NXP Semiconductors

PCF8534AHL/1 数据表(HTML) 9 Page - NXP Semiconductors

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PCF8534A_5
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 05 — 6 August 2009
9 of 47
NXP Semiconductors
PCF8534A
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 >3 × Vth.
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 Equation 1:
(1)
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)
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
–
()
n
-----------------
1
1a
+
-------------


2
×
+
V
LCD
=
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
–
()
+
--------------------------------------------
==



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