PCF8534 datasheet(6/40 Pages) PHILIPS

6 / 40 page

PCF8534_0

Preliminary datasheet

Rev. 00.05 — 20 February 2007

6 of 40

NXP Semiconductors

PCF8534

Universal LCD driver for low multiplex rates

Functional description

The PCF8534 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 60 segments.

The display configurations possible with the PCF8534 depend on the number of active

backplane outputs required; a selection of display configurations is given in Table 4.

All of the display configurations given in Table 4 can be implemented in the typical system

shown in Figure 3.

The host microprocessor / microcontroller maintains the 2-line I2C-bus communication

channel with the PCF8534. 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 the

power supplies (VDD, VSS and VLCD) and the LCD panel selected for the application.

OSC

internal oscillator enable input

A0, A1 and A2

44 to 46

subaddress inputs

SA0

I2C-bus slave address input: [0]

VSS

logic ground

VLCD

LCD supply voltage

BP0, BP1, BP2 and BP3

30 to 33

LCD backplane outputs

S0 to S59

50 to 80

and 1 to 29

LCD segment outputs

Table 3.

Pin description

Symbol

Description

Table 4.

Selection of display configurations

Number of

7 segment numeric

14 segment numeric

Dot matrix

Backplanes

Segments

Digits

Indicator

symbols

Characters

Indicator

symbols

240

240 (4 x 60)

180

180 (3 x 60)

120

120 (2 x 60)

160

60 (1 x 60)

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