PCF8579
LCD column driver for dot matrix graphic displays
Rev. 05 — 11 May 2009
Product data sheet
1. General description
The PCF8579 is a low power CMOS
1
LCD 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
and can drive 32
×
40 dots in a 32 row multiplexed LCD. Up to 16 PCF8579s can be
cascaded and up to 32 devices may be used on the same I
2
C-bus (using the two slave
addresses). The device is optimized for use with the PCF8578 LCD row/column driver.
Together these devices form a general purpose LCD dot matrix driver chip set, capable of
driving displays of up to 40960 dots. The PCF8579 is compatible with most
microcontrollers and communicates via a two-line bidirectional bus (I
2
C-bus). To allow
partial V
DD
shutdown the ESD protection system of the SCL and SDA pins does not use a
diode connected to V
DD
. Communication overhead is minimized by a display RAM with
auto-incremented addressing and display bank switching.
2. Features
I
LCD column driver
I
Used in conjunction with the PCF8578, this device forms part of a chip set capable of
driving up to 40960 dots
I
40 column outputs
I
Selectable multiplex rates; 1:8, 1:16, 1:24 or 1:32
I
Externally selectable bias configuration, 5 or 6 levels
I
Easily cascadable for large applications (up to 32 devices)
I
1280-bit RAM for display data storage
I
Display memory bank switching
I
Auto-incremented data loading across hardware subaddress boundaries (with
PCF8578)
I
Power-On Reset (POR) blanks display
I
Logic voltage supply range 2.5 V to 6 V
I
Maximum LCD supply voltage 9 V
I
Low power consumption
I
I
2
C-bus interface
I
Compatible with most microcontrollers
I
Optimized pinning for single plane wiring in multiple device applications (with
PCF8578)
I
Space saving 56-lead small outline package and 64-pin quad flat pack
1.
The definition of the abbreviations and acronyms used in this data sheet can be found in
Section 15.
NXP Semiconductors
PCF8579
LCD column driver for dot matrix graphic displays
3. Applications
I
I
I
I
I
Automotive information systems
Telecommunication systems
Point-of-sale terminals
Industrial computer terminals
Instrumentation
4. Ordering information
Table 1.
Ordering information
Package
Name
PCF8579T/1
PCF8579H/1
PCF8579HT/1
[1]
Type number
Description
plastic very small outline package; 56 leads
plastic low profile quad flat package; 64 leads;
body 10
×
10
×
1.4 mm
[1]
plastic thin quad flat package; 64 leads;
body 10
×
10
×
1.0 mm
Version
SOT190-1
SOT314-2
SOT357-1
VSO56
LQFP64
TQFP64
Should not be used for new designs.
5. Marking
Table 2.
Marking codes
Marking code
PCF8579T
PCF8579H
PCF8579HT
Type number
PCF8579T/1
PCF8579H/1
PCF8579HT/1
PCF8579_5
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 05 — 11 May 2009
2 of 41
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