PCF8576_01 datasheet(7/44 Pages) PHILIPS

7 / 44 page

2001 Oct 02

Philips Semiconductors

Product speciﬁcation

Universal LCD driver for low multiplex rates

PCF8576

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

14-SEGMENTS

ALPHANUMERIC

DOT MATRIX

BACKPLANES

SEGMENTS

DIGITS

INDICATOR

SYMBOLS

CHARACTERS

INDICATOR

SYMBOLS

160

160 dots (4

× 40)

120

120 dots (3

× 40)

80 dots (2

× 40)

40552

40 dots (1

× 40)

Fig.3 Typical system configuration.

handbook, full pagewidth

HOST

MICRO-

PROCESSOR/

MICRO-

CONTROLLER

2CB

SDA

SCL

OSC

ROSC

17 to 56

13 to 16

512

910

40 segment drives

4 backplanes

LCD PANEL

(up to 160

elements)

PCF8576

SA0 V

LCD

MBK277

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