PCF8576 Philips Semiconductors, PCF8576 Datasheet - Page 7

• Manufacturer Part Number: PCF8576
• Description: Universal LCD driver for low multiplex rates
• Manufacturer: Philips Semiconductors

Philips Semiconductors
6
The PCF8576 is a versatile peripheral device designed to
interface to any microprocessor/microcontroller to a wide
variety of LCDs. It can directly drive any static or
multiplexed LCD containing up to four backplanes and up
to 40 segments. The display configurations possible with
the PCF8576 depend on the number of active backplane
outputs required; a selection of display configurations is
given in Table 1.
All of the display configurations given in Table 1 can be
implemented in the typical system shown in Fig.3.
Table 1 Selection of display configurations
1998 Feb 06
handbook, full pagewidth
BACKPLANES
Universal LCD driver for low multiplex
rates
FUNCTIONAL DESCRIPTION
4
3
2
1
NUMBER OF
SEGMENTS
V
V
SS
DD
CONTROLLER
PROCESSOR/
160
120
MICRO-
MICRO-
80
40
HOST
R
2C B
t r
7-SEGMENTS NUMERIC
DIGITS
20
15
10
R OSC
5
Fig.3 Typical system configuration.
OSC
SDA
SCL
INDICATOR
1
2
6
SYMBOLS
7
A0
5
V
20
15
10
DD
8
5
PCF8576
A1
7
9
The host microprocessor/microcontroller maintains the
2-line I
The internal oscillator is selected by connecting pin OSC
to pin V
multiplexed LCD waveforms are generated internally.
The only other connections required to complete the
system are to the power supplies (V
the LCD panel chosen for the application.
A2
12
V
10
17 to 56
13 to 16
LCD
SA0 V
CHARACTERS
2
11
C-bus communication channel with the PCF8576.
SS
SS
. The appropriate biasing voltages for the
40 segment drives
ALPHANUMERIC
10
4 backplanes
8
5
2
14-SEGMENTS
INDICATOR
SYMBOLS
LCD PANEL
(up to 160
elements)
20
10
12
8
MBK277
DD
Product specification
, V
160 dots (4
120 dots (3
80 dots (2
40 dots (1
SS
PCF8576
DOT MATRIX
and V
LCD
40)
40)
) and
40)
40)