PCF8533 データシートの表示（PDF） - Philips Electronics

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PCF8533

Universal LCD driver for low multiplex rates

Philips Electronics 

Philips Semiconductors

Universal LCD driver for low multiplex rates

Product specification

PCF8533

5 PINNING

SYMBOL

SDAACK

SDA

SCL

CLK

VDD

SYNC

OSC

A0, A1 and A2

SA0

VSS

VLCD

BP0, BP1, BP2 and BP3

S0 to S79

PAD

1

2 and 3

4 and 5

6

7

8

9

10, 11 and 12

13

14

15

17, 99, 16 and 98

18 to 97

DESCRIPTION

I2C-bus acknowledge output; note 1

I2C-bus serial data input; note 1

I2C-bus serial clock input

external clock input/output

supply voltage

cascade synchronization input/output

internal oscillator enable input

subaddress inputs

I2C-bus slave address input; bit 0

logic ground

LCD supply voltage

LCD backplane outputs

LCD segment outputs

Note

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

6 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.

The host microprocessor/microcontroller maintains the 2-line I2C-bus communication channel with the PCF8533.

The internal oscillator is selected by connecting pad OSC 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 the LCD panel selected for the application.

Table 1 Selection of display configurations

NUMBER OF

BACKPLANES SEGMENTS

4

320

3

240

2

160

1

80

7-SEGMENTS NUMERIC

DIGITS

40

30

20

10

INDICATOR

SYMBOLS

40

30

20

10

14-SEGMENTS

ALPHANUMERIC

CHARACTERS

INDICATOR

SYMBOLS

DOT MATRIX

20

40

320 dots (4 × 80)

16

16

240 dots (3 × 80)

10

20

160 dots (2 × 80)

5

10

80 dots (1 × 80)

1999 Jul 30

5

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