1999 Jul 30

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Philips Semiconductors

Product specification

Universal LCD driver for low multiplex rates

PCF8533

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PINNING

Note

1. For most applications SDA and SDAACK will be shorted together; see Chapter 7.

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FUNCTIONAL DESCRIPTION

The PCF8533 is a versatile peripheral device designed to interface 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 80 segments.

The display configurations possible with the PCF8533 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.2.

LCD waveforms are generated internally. The only other connections required to complete the system are to the power

Table 1

Selection of display configurations

SYMBOL

PAD

DESCRIPTION

SDAACK

1

SDA

2 and 3

SCL

4 and 5

CLK

6

external clock input/output

7

supply voltage

SYNC

8

cascade synchronization input/output

OSC

9

internal oscillator enable input

A0, A1 and A2

10, 11 and 12

subaddress inputs

SA0

13

14

logic ground

15

LCD supply voltage

BP0, BP1, BP2 and BP3

17, 99, 16 and 98

LCD backplane outputs

S0 to S79

18 to 97

LCD segment outputs

NUMBER OF

7-SEGMENTS NUMERIC

14-SEGMENTS

ALPHANUMERIC

DOT MATRIX

BACKPLANES

SEGMENTS

DIGITS

INDICATOR

SYMBOLS

CHARACTERS

INDICATOR

SYMBOLS

4

320

40

40

20

40

320 dots (4

× 80)

3

240

30

30

16

16

240 dots (3

× 80)

2

160

20

20

10

20

160 dots (2

× 80)

1

80

10

10

5

10

80 dots (1

× 80)