PCF8576DU/2DA/2 データシートの表示（PDF） - Philips Electronics
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PCF8576DU/2DA/2 Datasheet PDF : 41 Pages
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Philips Semiconductors
Universal LCD driver for low
multiplex rates
Product specification
PCF8576D
6 FUNCTIONAL DESCRIPTION
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.
The host microprocessor/microcontroller maintains the
2-line I2C-bus communication channel with the
PCF8576D. The internal oscillator is enabled by
connecting pin OSC to pin VSS. The appropriate biasing
voltages for the multiplexed LCD waveforms are
generated internally. The only other connections required
to complete the system are to the power supplies (VDD,
VSS and VLCD) and the LCD panel chosen for the
application.
Table 1 Selection of display configurations
NUMBER OF
BACKPLANES SEGMENTS
4
160
3
120
2
80
1
40
7-SEGMENTS NUMERIC
DIGITS
20
15
10
5
INDICATOR
SYMBOLS
20
15
10
5
14-SEGMENTS
ALPHANUMERIC
CHARACTERS
INDICATOR
SYMBOLS
10
20
8
8
5
10
2
12
DOT MATRIX
160 dots (4 × 40)
120 dots (3 × 40)
80 dots (2 × 40)
40 dots (1 × 40)
VDD
R
≤
tr
2CB
HOST
MICRO-
PROCESSOR/
MICRO-
CONTROLLER
VSS
VDD VLCD
6
13
SDA 1, 58, 59
40 segment drives
SCL 2, 3 PCF8576DU
OSC
7
4 backplanes
8 9 10 11 12
A0 A1 A2 SA0 VSS
LCD PANEL
(up to 160
elements)
mdb079
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.
Fig.5 Typical system configuration.
2004 Dec 22
9
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