2003 Apr 14 3
Philips Semiconductors Product specification
LCD row/column driver for
dot matrix graphic displays
PCF8578
1 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
8
⁄
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
• I
2
C-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.
2 APPLICATIONS
• Automotive information systems
• Telecommunication systems
• Point-of-sale terminals
• Computer terminals
• Instrumentation.
3 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 (I
2
C-bus). Communication overheads are
minimized by a display RAM with auto-incremented
addressing and display bank switching.
4 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
