Philips Semiconductors
Product specification
Universal LCD driver for low multiplex
rates
CONTENTS
1
2
3
4
5
6
6.1
6.2
6.3
6.4
6.4.1
6.4.2
6.4.3
6.4.4
6.5
6.5.1
6.5.2
6.6
6.7
6.8
6.9
6.10
6.11
6.12
6.13
6.14
6.15
6.16
FEATURES
GENERAL DESCRIPTION
ORDERING INFORMATION
BLOCK DIAGRAM
PINNING
FUNCTIONAL DESCRIPTION
Power-on reset
LCD bias generator
LCD voltage selector
LCD drive mode waveforms
Static drive mode
1 : 2 multiplex drive mode
1 : 3 multiplex drive mode
1 : 4 multiplex drive mode
Oscillator
Internal clock
External clock
Timing
Display latch
Shift register
Segment outputs
Backplane outputs
Display RAM
Data pointer
Subaddress counter
Output bank selector
Input bank selector
Blinker
7
7.1
7.2
7.3
7.4
7.5
7.6
7.7
7.8
7.9
7.10
8
9
10
11
11.1
11.2
12
12.1
13
14
15
15.1
15.2
15.3
15.4
16
17
18
PCF8576
CHARACTERISTICS OF THE I
2
C-BUS
Bit transfer
START and STOP conditions
System configuration
Acknowledge
PCF8576 I
2
C-bus controller
Input filters
I
2
C-bus protocol
Command decoder
Display controller
Cascaded operation
LIMITING VALUES
HANDLING
DC CHARACTERISTICS
AC CHARACTERISTICS
Typical supply current characteristics
Typical characteristics of LCD outputs
APPLICATION INFORMATION
Chip-on-glass cascadability in single plane
BONDING PAD LOCATIONS
PACKAGE OUTLINES
SOLDERING
Introduction
Reflow soldering
Wave soldering
Repairing soldered joints
DEFINITIONS
LIFE SUPPORT APPLICATIONS
PURCHASE OF PHILIPS I
2
C COMPONENTS
1998 Feb 06
2
Philips Semiconductors
Product specification
Universal LCD driver for low multiplex
rates
1
FEATURES
PCF8576
•
Compatible with any 4-bit, 8-bit or 16-bit
microprocessors/microcontrollers
•
May be cascaded for large LCD applications (up to
2560 segments possible)
•
Cascadable with 24-segment LCD driver PCF8566
•
Optimized pinning for plane wiring in both single and
multiple PCF8576 applications
•
Space-saving 56-lead plastic very small outline package
(VSO56)
•
Very low external component count (at most one
resistor, even in multiple device applications)
•
Compatible with chip-on-glass technology
•
Manufactured in silicon gate CMOS process.
2
GENERAL DESCRIPTION
•
Single-chip LCD controller/driver
•
Selectable backplane drive configuration: static or 2/3/4
backplane multiplexing
•
Selectable display bias configuration: static,
1
⁄
2
or
1
⁄
3
•
Internal LCD bias generation with voltage-follower
buffers
•
40 segment drives: up to twenty 8-segment numeric
characters; up to ten 15-segment alphanumeric
characters; or any graphics of up to 160 elements
•
40
×
4-bit RAM for display data storage
•
Auto-incremented display data loading across device
subaddress boundaries
•
Display memory bank switching in static and duplex
drive modes
•
Versatile blinking modes
•
LCD and logic supplies may be separated
•
Wide power supply range: from 2 V for low-threshold
LCDs and up to 9 V for guest-host LCDs and
high-threshold (automobile) twisted nematic LCDs
•
Low power consumption
•
Power-saving mode for extremely low power
consumption in battery-operated and telephone
applications
•
I
2
C-bus interface
•
TTL/CMOS compatible
3
ORDERING INFORMATION
The PCF8576 is a peripheral device which interfaces to
almost any Liquid Crystal Display (LCD) with low multiplex
rates. It generates the drive signals for any static or
multiplexed LCD containing up to four backplanes and up
to 40 segments and can easily be cascaded for larger LCD
applications. The PCF8576 is compatible with most
microprocessors/microcontrollers and communicates via a
two-line bidirectional I
2
C-bus. Communication overheads
are minimized by a display RAM with auto-incremented
addressing, by hardware subaddressing and by display
memory switching (static and duplex drive modes).
PACKAGE
TYPE NUMBER
NAME
PCF8576T
PCF8576U
PCF8576U/2
PCF8576U/5
PCF8576U/7
PCF8576U/10
PCF8576U/12
VSO56
−
−
−
−
FFC
FFC
chip in tray
chip with bumps in tray
unsawn wafer
chip with bumps on tape
chip on film frame carrier (FFC)
chip with bumps on film frame carrier (FFC)
DESCRIPTION
plastic very small outline package; 56 leads
VERSION
SOT190-1
−
−
−
−
−
−
1998 Feb 06
3
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