2000 Feb 11

31

Philips Semiconductors

Product specification

34

× 128 pixel matrix driver

PCF8531

handbook, full pagewidth

MGS483

HOST

MICROPROCESSOR/

MICROCONTROLLER

LCD PANEL

VSS1,

VSS2

VSS

VDD(I2C)

VLCD

VDD1 to VDD3

VSS1, VSS2

SDA

SCL

PCF8531

Rpu

Rpu

RES

128 column drivers

34 row drivers

Fig.24 Typical system configuration.

must be connected to the positive power supply via pull-up resistors. The internal oscillator requires no external

components. The appropriate intermediate biasing voltage for the multiplexed LCD waveforms are generated on-chip.