Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsInterface ICsInterface IC - I/O extensions POR I²C, SMBus 400 kHz SSOP 24

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22

I/O

Port

P17−P10

Shift

Register

16 Bits

LP Filter

Interrupt

Logic

Input

Filter

23

Power-On

Reset

Read Pulse

Write Pulse

PCF8575

3

2

21

1

24

12

GND

V

CC

SDA

SCL

A2

A1

A0

INT

I

2

C Bus

Control

P07−P00

To Interrupt

Logic

P07−P00

V

CC

GND

C

I

S

D Q

FF

C

I

S

D Q

FF

Write Pulse

Data From

Shift Register

Power-On

Reset

Read Pulse

Data To

Shift Register

100 µA

P17−P10

I

OH

I

OL

I

OHT

PCF8575

REMOTE 16-BIT I

2

C AND SMBus I/O EXPANDER

WITH INTERRUPT OUTPUT

SCPS121D – JANUARY 2005 – REVISED APRIL 2007

LOGIC DIAGRAM (POSITIVE LOGIC)

SIMPLIFIED SCHEMATIC DIAGRAM OF EACH P-PORT INPUT/OUTPUT

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