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 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
· 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.


Application

· Automotive information systems
· Telecommunication systems
· Point-of-sale terminals
· Computer terminals
· Instrumentation.


Pinout




Specifications

SYMBOL	PARAMETER	MIN.	MAX.	UNIT
VDD	supply voltage	-0.5	+8.0	V
VLCD	LCD supply voltage	VDD -11	VDD	V
VI1	input voltage CLK, SYNC, SA0, OSC, A0 to A2	VSS - 0.5	VDD + 0.5	V
VI2	input voltage SDA, SCL	VLCD - 0.5	VDD + 0.5	V
Vo1	output voltage SYNC and CLK	VSS - 0.5	VDD + 0.5	V
Vo2	output voltage R0 to R7, R8/C8 to R31/C31 and C32 to C39	VLCD - 0.5	VDD + 0.5	V
II	DC input current	-10	+10	mA
IO	DC output current	-10	+10	mA
IDD, ISS, ILCD	VDD, VSS or VLCD current	-50	+50	mA
Ptot	total power dissipation	-	400	mW
PO	power dissipation per output	-	100	mW
Tstg	storage temperature	-65	+150

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 PCF8578 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.