November 22, 2004

7

Philips Semiconductors

Preliminary specification

Universal LCD driver

for low multiplex rates

PCF8562

6

FUNCTIONAL DESCRIPTION

The PCF8562 is a versatile peripheral device designed to interface any microprocessor/microcontroller with a wide

variety of LCDs. It can directly drive any static or multiplexed LCD containing up to four backplanes and up to

32 segments.

The display configurations possible with the PCF8562 depend on the number of active backplane outputs required. A

selection of display configurations is shown in Table 1; all of these configurations can be implemented in the typical

system shown in Fig.4.

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

Table 1

Selection of display configurations

NUMBER OF

7-SEGMENTS NUMERIC

14-SEGMENTS

ALPHANUMERIC

DOT MATRIX

BACKPLANE

S

SEGMENTS

DIGITS

INDICATOR

SYMBOLS

CHARACTERS

INDICATOR

SYMBOLS

4

128

16

16

8

16

128 dots (4

× 32)

3

86

12

12

6

12

96 dots (3

× 32)

2

64

8

8

4

8

64 dots (2

× 32)

1

32

4

4

2

4

32 dots (1

× 32)

Fig.4 Typical system configuration.

The resistance of the power supply lines must be kept to a minimum.

HOST

MICRO-

PROCESSOR/

MICRO-

CONTROLLER

tr

2CB

SDA

SCL

OSC

32 segment drives

4 backplanes

LCD PANEL

(up to 128

elements)

PCF8562

A0

A1

A2

SA0

VDD

VSS

VSS

VDD

VLCD

MDB079v2

R

≤