PCF8576CH NXP Semiconductors, PCF8576CH Datasheet - Page 11

• Manufacturer Part Number: PCF8576CH
• Manufacturer: NXP Semiconductors

Specifications of PCF8576CH

• Operating Supply Voltage (typ): 2.5/3.3/5V
• Number Of Digits: 20
• Number Of Segments: 160
• Package Type: LQFP
• Pin Count: 64
• Mounting: Surface Mount
• Power Dissipation: 400mW
• Frequency (max): 315KHz
• Operating Supply Voltage (min): 2V
• Operating Supply Voltage (max): 6V
• Lead Free Status / Rohs Status: Compliant

NXP Semiconductors
PCF8576C_9
Product data sheet
V
D
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
2
2
off RMS
•
•
n = 1 for static mode
n = 2 for 1:2 multiplex
n = 3 for 1:3 multiplex
n = 4 for 1:4 multiplex
=
bias is
bias is
1:3 multiplex (
1:4 multiplex (
----------------------- -
V
V
Equation
off RMS
on RMS
=
----------
3
3
21
V
LCD
=
=
=
3, the discrimination for an LCD drive mode of 1:3 multiplex with
1.732
----------------------------- -
n
1.528
1
1
a
2
2
2
------------------------------------------- -
a
a 1
–
bias):
bias):
V
1
+
2a
–
and the discrimination for an LCD drive mode of 1:4 multiplex with
LCD
+
.
Rev. 09 — 9 July 2009
1
LCD
+
a
2
2
n
V
V
+
=
2
+
is sometimes referred as the LCD operating voltage.
off(RMS)
LCD
LCD
on(RMS)
3V
n 1
n 1
–
–
off RMS
=
=
) for the LCD is calculated with
to V
--------------------- -
6 V
4
3
off(RMS)
Universal LCD driver for low multiplex rates
when
off RMS
3
=
1
and is determined from
3
2.309V
bias is used.
=
2.449V
off RMS
off RMS
PCF8576C
Equation
© NXP B.V. 2009. All rights reserved.
Equation
2:
3:
11 of 56
LCD
(2)
(3)