PCF8576U/5(2001) データシートの表示（PDF） - Philips Electronics
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PCF8576U/5 Datasheet PDF : 44 Pages
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Philips Semiconductors
Universal LCD driver for low multiplex rates
Product specification
PCF8576
6 FUNCTIONAL DESCRIPTION
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 .
All of the display configurations given in Table can be
implemented in the typical system shown in Fig.3.
The host microprocessor/microcontroller maintains the
2-line I2C-bus communication channel with the PCF8576.
The internal oscillator is selected 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.
Selection of display configurations
NUMBER OF
7-SEGMENTS NUMERIC
BACKPLANES SEGMENTS
4
160
3
120
2
80
1
40
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)
handbook, full pagewidth
VDD
R tr
2CB
HOST
MICRO-
PROCESSOR/
MICRO-
CONTROLLER
VSS
VDD
VLCD
5
SDA 1
12
17 to 56 40 segment drives
SCL 2
PCF8576
OSC 6
13 to 16 4 backplanes
ROSC
7 8 9 10 11
A0 A1 A2 SA0 VSS
LCD PANEL
(up to 160
elements)
MBK277
2001 Oct 02
Fig.3 Typical system configuration.
7
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