PCF8576_3.pdf

INTEGRATED CIRCUITS

DATA SHEET

PCF8576

Universal LCD driver for low

multiplex rates

Product speciﬁcation

Supersedes data of 1997 Nov 18

File under Integrated Circuits, IC12

1998 Feb 06

Philips Semiconductors

Product speciﬁcation

Universal LCD driver for low multiplex

rates

PCF8576

CONTENTS

CHARACTERISTICS OF THE I 2 C-BUS

FEATURES

7.1

Bit transfer

7.2

START and STOP conditions

GENERAL DESCRIPTION

7.3

System configuration

ORDERING INFORMATION

7.4

Acknowledge

7.5

PCF8576 I 2 C-bus controller

BLOCK DIAGRAM

7.6

Input filters

PINNING

7.7

I 2 C-bus protocol

FUNCTIONAL DESCRIPTION

7.8

Command decoder

6.1

Power-on reset

7.9

Display controller

7.10

Cascaded operation

6.2

LCD bias generator

6.3

LCD voltage selector

LIMITING VALUES

6.4

LCD drive mode waveforms

HANDLING

6.4.1

Static drive mode

DC CHARACTERISTICS

6.4.2

1 : 2 multiplex drive mode

6.4.3

1 : 3 multiplex drive mode

AC CHARACTERISTICS

6.4.4

1 : 4 multiplex drive mode

11.1

Typical supply current characteristics

6.5

Oscillator

11.2

Typical characteristics of LCD outputs

6.5.1

Internal clock

APPLICATION INFORMATION

6.5.2

External clock

12.1

Chip-on-glass cascadability in single plane

6.6

Timing

6.7

Display latch

BONDING PAD LOCATIONS

6.8

Shift register

PACKAGE OUTLINES

6.9

Segment outputs

SOLDERING

6.10

Backplane outputs

6.11

Display RAM

15.1

Introduction

6.12

Data pointer

15.2

Reflow soldering

6.13

Subaddress counter

15.3

Wave soldering

6.14

Output bank selector

15.4

Repairing soldered joints

6.15

Input bank selector

DEFINITIONS

6.16

Blinker

LIFE SUPPORT APPLICATIONS

PURCHASE OF PHILIPS I 2 C COMPONENTS

1998 Feb 06

Philips Semiconductors

Product speciﬁcation

Universal LCD driver for low multiplex

rates

PCF8576

1 FEATURES

Compatible with any 4-bit, 8-bit or 16-bit

microprocessors/microcontrollers

Single-chip LCD controller/driver

May be cascaded for large LCD applications (up to

2560 segments possible)

Selectable backplane drive configuration: static or 2/3/4

backplane multiplexing

Cascadable with 24-segment LCD driver PCF8566

Selectable display bias configuration: static, 1

¤ 2 or 1

¤ 3

Optimized pinning for plane wiring in both single and

multiple PCF8576 applications

Internal LCD bias generation with voltage-follower

buffers

Space-saving 56-lead plastic very small outline package

(VSO56)

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

Very low external component count (at most one

resistor, even in multiple device applications)

40 ´ 4-bit RAM for display data storage

Compatible with chip-on-glass technology

Auto-incremented display data loading across device

subaddress boundaries

Manufactured in silicon gate CMOS process.

Display memory bank switching in static and duplex

drive modes

2 GENERAL DESCRIPTION

Versatile blinking modes

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).

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

PACKAGE

TYPE NUMBER

NAME

DESCRIPTION

VERSION

PCF8576T

VSO56 plastic very small outline package; 56 leads

SOT190-1

PCF8576U

chip in tray

PCF8576U/2

chip with bumps in tray

PCF8576U/5

unsawn wafer

PCF8576U/7

chip with bumps on tape

PCF8576U/10

FFC

chip on ﬁlm frame carrier (FFC)

PCF8576U/12

FFC

chip with bumps on ﬁlm frame carrier (FFC)

1998 Feb 06

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BP0

BP2

BP1

BP3

S0 to S39

17 to 56

V DD

BACKPLANE

OUTPUTS

DISPLAY SEGMENT OUTPUTS

LCD

VOLTAGE

SELECTOR

DISPLAY LATCH

LCD BIAS

GENERATOR

SHIFT REGISTER

V LCD

PCF8576

CLK

INPUT

BANK

SELECTOR

DISPLAY

RAM

40 x 4 BITS

OUTPUT

BANK

SELECTOR

SYNC

TIMING

BLINKER

DISPLAY

CONTROLLER

OSC

OSCILLATOR

POWER-

RESET

DATA

POINTER

V SS

COMMAND

DECODER

SUB-

ADDRESS

COUNTER

SCL

INPUT

FILTERS

I C - BUS

CONTROLLER

SDA

SA0

MBK276

Fig.1 Block diagram (for VSO56 package; SOT190-1).

Philips Semiconductors

Product speciﬁcation

Universal LCD driver for low multiplex

rates

PCF8576

5 PINNING

SYMBOL

DESCRIPTION

SDA

I 2 C-bus serial data input/output

SCL

I 2 C-bus serial clock input

SYNC

cascade synchronization input/output

CLK

external clock input/output

V DD

supply voltage

OSC

oscillator input

A0 to A2

7 to 9

I 2 C-bus subaddress inputs

SA0

I 2 C-bus slave address input; bit 0

V SS

logic ground

V LCD

LCD supply voltage

BP0, BP2, BP1 and BP3

13 to 16

LCD backplane outputs

S0 to S39

17 to 56

LCD segment outputs

1998 Feb 06

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