PCF8578U datasheet(3/44 Pages) PHILIPS

3 / 44 page

1998 Sep 08

Philips Semiconductors

Product speciﬁcation

LCD row/column driver for dot matrix

graphic displays

PCF8578

FEATURES

• Single chip LCD controller/driver

• Stand-alone or may be used with up to 32 PCF8579s

(40960 dots possible)

• 40 driver outputs, configurable as 32⁄8, 24⁄16, 16⁄24 or

⁄32 rows/columns

• Selectable multiplex rates; 1 : 8, 1 : 16, 1 : 24 or 1 : 32

• Externally selectable bias configuration, 5 or 6 levels

• 1280-bit RAM for display data storage and scratch pad

• Display memory bank switching

• Auto-incremented data loading across hardware

subaddress boundaries (with PCF8579)

• Provides display synchronization for PCF8579

• On-chip oscillator, requires only 1 external resistor

• Power-on reset blanks display

• Logic voltage supply range 2.5 to 6 V

• Maximum LCD supply voltage 9 V

• Low power consumption

• I2C-bus interface

• TTL/CMOS compatible

• Compatible with most microcontrollers

• Optimized pinning for single plane wiring in multiple

device applications (with PCF8579)

• Space saving 56-lead plastic mini-pack and 64 pin quad

flat pack

• Compatible with chip-on-glass technology.

APPLICATIONS

• Automotive information systems

• Telecommunication systems

• Point-of-sale terminals

• Computer terminals

• Instrumentation.

GENERAL DESCRIPTION

The PCF8578 is a low power CMOS LCD row/column

driver, designed to drive dot matrix graphic displays at

multiplex rates of 1 : 8, 1 : 16, 1 : 24 or 1 : 32. The device

has 40 outputs, of which 24 are programmable,

configurable as 32

⁄8, 24⁄16, 16⁄24 or 8⁄32 rows/columns.

The PCF8578 can function as a stand-alone LCD

controller/driver for use in small systems, or for larger

systems can be used in conjunction with up to

32 PCF8579s for which it has been optimized. Together

these two devices form a general purpose LCD dot matrix

driver chip set, capable of driving displays of up to

40960 dots. The PCF8578 is compatible with most

microcontrollers and communicates via a two-line

bidirectional bus (I2C-bus). Communication overheads are

minimized by a display RAM with auto-incremented

addressing and display bank switching.

ORDERING INFORMATION

TYPE NUMBER

PACKAGE

NAME

DESCRIPTION

VERSION

PCF8578T

VSO56

plastic very small outline package; 56 leads

SOT190-1

PCF8578U/2

−

chip with bumps in tray

−

PCF8578H

LQFP64

plastic low proﬁle quad ﬂat package; 64 leads; body 10

× 10 × 1.4 mm

SOT314-2

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