PCA8534AH-Q900 NXP [NXP Semiconductors], PCA8534AH-Q900 Datasheet - Page 8
PCA8534AH-Q900
Manufacturer Part Number
PCA8534AH-Q900
Description
Universal LCD driver for low multiplex rates
Manufacturer
NXP [NXP Semiconductors]
Datasheet
1.PCA8534AH-Q900.pdf
(44 pages)
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NXP Semiconductors
PCA8534A_2
Product data sheet
The RMS off-state voltage (V
Discrimination is the ratio of V
Using
1
1
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
D
⁄
⁄
2
2
•
•
off RMS
n = 3 for 1:3 multiplex drive mode
n = 4 for 1:4 multiplex drive mode
bias is
bias is
=
(
1:3 multiplex (
1:4 multiplex (
---------------------- -
V
V
Equation
off RMS
on RMS
)
(
(
=
----------
3
3
21
V
LCD
)
)
=
=
=
All information provided in this document is subject to legal disclaimers.
3, the discrimination for an LCD drive mode of 1:3 multiplex with
1.732
----------------------------- -
n
a
1.528
1
1
×
2
⁄
⁄
(
------------------------------------------- -
(
2
2
a
a 1
–
(
bias):
bias):
V
1
+
2a
–
LCD
and the discrimination for an LCD drive mode of 1:4 multiplex with
+
Rev. 02 — 1 June 2010
1
.
LCD
+
)
a
)
2
2
)
n
V
V
=
2
+
+
is sometimes referred as the LCD operating voltage.
LCD
LCD
off(RMS)
(
(
on(RMS)
3V
n 1
n 1
–
–
off RMS
=
=
)
(
)
) for the LCD is calculated with
to V
(
--------------------- -
6
4
×
)
×
3
off(RMS)
V
when
Universal LCD driver for low multiplex rates
off RMS
3
)
(
1
=
⁄
and is determined from
3
)
2.309V
bias is used.
=
2.449V
off RMS
(
off RMS
(
)
PCA8534A
Equation
)
© NXP B.V. 2010. All rights reserved.
Equation
2:
3:
8 of 44
LCD
(2)
(3)
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