描述 Description

The PCF8578 is a low power CMOS LCD row and column driver, designed to drivedot matrix graphic displays at multiplex rates of 1:8, 1:16, 1:24 or 1:32. The devicehas 40 outputs, of which 24 are programmable and configurable for the following ratiosof rows/columns: 32/8, 24/16, 16/24 or 8/32. The PCF8578 can function as a stand-aloneLCD controller and driver for use in small systems. For larger systems it can be used inconjunction with up to 32 PCF8579s for which it has been optimized. Together these twodevices form a general purpose LCD dot matrix driver chip set, capable of drivingdisplays of up to 40960 dots. The PCF8578 is compatible with most microcontrollers andcommunicates via a two-line bidirectional bus (I2C-bus). Communication overhead isminimized by a display RAM with auto-incremented addressing and display bankswitching.

特性 Features

Single chip LCD controller and driver
Stand-alone or may be used with up to 32 PCF8579s (40960 dots possible)
40 driver outputs, configurable for several ratios of rows/columns: 32/8, 24/16, 16/24 or 8/32
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 (POR) blanks display
Logic voltage supply range 2.5 V to 6 V
Maximum LCD supply voltage 9 V
Low power consumption
I2C-bus interface
Compatible with most microcontrollers
Optimized pinning for single plane wiring in multiple device applications (with PCF8579)
Space saving 56-lead small outline package and 64 pin quad flat pack

應(yīng)用 Application

Automotive information systems
Telecommunication systems
Point-of-sale terminals
Industrial computer terminals
Instrumentation