PCF8566P datasheet(6/40 Pages) PHILIPS

6 / 40 page

1998 May 04

Philips Semiconductors

Product speciﬁcation

Universal LCD driver for low multiplex

rates

PCF8566

FUNCTIONAL DESCRIPTION

The PCF8566 is a versatile peripheral device designed to

interface any microprocessor to a wide variety of LCDs.

It can directly drive any static or multiplexed LCD

containing up to 4 backplanes and up to 24 segments.

The display configurations possible with the PCF8566

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.

The host microprocessor/microcontroller maintains the

two-line I2C-bus communication channel with the

PCF8566. The internal oscillator is selected by tying OSC

(pin 6) to 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

to the LCD panel chosen for the application.

Table 1

Selection of display conﬁgurations

ACTIVE

BACKPLANE

OUTPUTS

NUMBER OF

SEGMENTS

7-SEGMENT NUMERIC

14-SEGMENT

ALPHANUMERIC

DOT MATRIX

12 digits + 12 indicator

symbols

6 characters + 12 indicator

symbols

96 dots (4

× 24)

9 digits + 9 indicator

symbols

4 characters + 16 indicator

symbols

72 dots (3

× 24)

6 digits + 6 indicator

symbols

3 characters + 6 indicator

symbols

48 dots (2

× 24)

3 digits + 3 indicator

symbols

1 character + 10 indicator

symbols

24 dots

Fig.3 Typical system configuration.

handbook, full pagewidth

HOST

MICRO-

PROCESSOR/

MICRO-

CONTROLLER

SDA

SCL

OSC

17 to 40

13 to 16

512

910

24 segment drives

4 backplanes

LCD PANEL

(up to 96

elements)

PCF8566

SA0

VDD

VLCD

VSS

MGG385

≤

trise

2 Cbus

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