pcf85162 NXP Semiconductors, pcf85162 Datasheet - Page 7

• Manufacturer Part Number: pcf85162
• Description: Universal Lcd Driver For Low Multiplex Rates
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCF85162_1
Product data sheet
where the values for n are
The RMS off-state voltage (V
Discrimination is the ratio of V
Using
bias is
bias is
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
•
•
off RMS
n = 1 for static drive mode
n = 2 for 1:2 multiplex drive mode
n = 3 for 1:3 multiplex drive mode
n = 4 for 1:4 multiplex drive mode
=
(
1:3 multiplex (
1:4 multiplex (
V
---------------------- -
V
Equation
off RMS
on RMS
----------
)
3
3
21
(
(
=
=
V
=
)
LCD
)
1.732
1.528
=
3, the discrimination for an LCD drive mode of 1:3 multiplex with
----------------------------- -
n
a
1
1
2
×
⁄
⁄
(
------------------------------------------- -
(
2
2
a
a 1
and the discrimination for an LCD drive mode of 1:4 multiplex with
–
(
bias):
bias):
.
V
1
+
2a
–
Rev. 01 — 7 January 2010
LCD
+
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
(
)
Equation
PCF85162
)
© NXP B.V. 2010. All rights reserved.
Equation
2:
1
⁄
2
3:
7 of 39
LCD
1
(2)
(3)
⁄
2