pcf8576d NXP Semiconductors, pcf8576d Datasheet - Page 9

• Manufacturer Part Number: pcf8576d
• Description: Universal Lcd Driver For Low Multiplex Rates
• Manufacturer: NXP Semiconductors

Philips Semiconductors
6
The PCF8576D is a versatile peripheral device designed
to interface any microprocessor/microcontroller with 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 PCF8576D
depend on the number of active backplane outputs
required. A selection of display configurations is shown in
Table 1; all of these configurations can be implemented in
the typical system shown in Fig.5.
Table 1 Selection of display configurations
2004 Dec 22
BACKPLANES
4
3
2
1
Universal LCD driver for low
multiplex rates
The resistance of the power supply lines must be kept to a minimum.
For chip-on-glass applications, due to Indium Tin Oxide (ITO) track resistance, each supply line must be routed separately
between the chip and the connector.
FUNCTIONAL DESCRIPTION
NUMBER OF
160
120
80
40
SEGMENTS
V
V
SS
DD
CONTROLLER
PROCESSOR/
MICRO-
MICRO-
HOST
R
2C
t
r
B
20
15
10
5
7-SEGMENTS NUMERIC
DIGITS
Fig.5 Typical system configuration.
OSC
SDA
SCL
20
15
10
5
INDICATOR
1, 58, 59
2, 3
7
SYMBOLS
8
A0
6
9
PCF8576DU
A1
V
9
DD
10
The host microprocessor/microcontroller maintains the
2-line I
PCF8576D. The internal oscillator is enabled by
connecting pin OSC to pin V
voltages for the multiplexed LCD waveforms are
generated internally. The only other connections required
to complete the system are to the power supplies (V
V
application.
A2
13
SS
V
11
LCD
and V
SA0
10
8
5
2
CHARACTERS
2
12
C-bus communication channel with the
V
SS
LCD
40 segment drives
4 backplanes
ALPHANUMERIC
) and the LCD panel chosen for the
14-SEGMENTS
20
8
10
12
INDICATOR
SYMBOLS
LCD PANEL
(up to 160
elements)
SS
. The appropriate biasing
mdb079
Product specification
PCF8576D
160 dots (4
120 dots (3
80 dots (2
40 dots (1
DOT MATRIX
DD
40)
40)
40)
40)
,