PCF8577C datasheet(3/28 Pages) PHILIPS

3 / 28 page

1998 Jul 30

Philips Semiconductors

Product speciﬁcation

LCD direct/duplex driver with

I2C-bus interface

PCF8577C

FEATURES

• Direct/duplex drive modes with up to

32/64 LCD-segment drive capability per device

• Operating supply voltage: 2.5 to 6 V

• Low power consumption

• I2C-bus interface

• Optimized pinning for single plane wiring

• Single-pin built-in oscillator

• Auto-incremented loading across device subaddress

boundaries

• Display memory switching in direct drive mode

• May be used as I2C-bus output expander

• System expansion up to 256 segments

• Power-on reset blanks display

• I2C-bus address: 0111 0100.

GENERAL DESCRIPTION

The PCF8577C is a single chip, silicon gate CMOS circuit.

It is designed to drive liquid crystal displays with up to

32 segments directly, or 64 segments in a duplex

configuration.

The two-line I2C-bus interface substantially reduces wiring

overheads in remote display applications. I2C-bus traffic is

minimized in multiple IC applications by automatic address

incrementing, hardware subaddressing and display

memory switching (direct drive mode).To allow partial VDD

shutdown the ESD protection system of the SCL and SDA

pins does not use a diode connected to VDD.

ORDERING INFORMATION

BLOCK DIAGRAM

TYPE NUMBER

PACKAGE

NAME

DESCRIPTION

VERSION

PCF8577CP

DIP40

plastic dual in-line package; 40 leads (600 mil)

SOT129-1

PCF8577CT

VSO40

plastic very small outline package; 40 leads

SOT158A

PCF8577CT

−

VS040 in blister tape

−

PCF8577CU/10

−

chip on ﬁlm-frame-carrier (FFC)

−

Fig.1 Block diagram.

MGA727

VDD

VSS

SDA

SCL

A0/OSC

A2/BP2

BP1

S32

PCF8577C

I C - BUS

CONTROLLER

INPUT

FILTERS

SEGMENT BYTE

REGISTERS

AND

MULTIPLEX

LOGIC

BACKPLANE

AND

SEGMENT

DRIVERS

CONTROL REGISTER

AND

COMPARATOR

OSCILLATOR

AND

DIVIDER

POWER -

RESET

I C - BUS

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