PCA9555PWG4 参数 Datasheet PDF下载

SCPS131E – AUGUST 2005 – REVISED MAY 2008

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LOGIC DIAGRAM (POSITIVE LOGIC)

1

PCA9555

Interrupt

Logic

LP Filter

INT

A0

A1

A2

SCL

SDA

21

2

3

22

23

Input

Filter

I

2

C Bus

Control

Shift

Register

16 Bits

I/O

Port

P17−P10

P07−P00

Write Pulse

V

CC

GND

24

12

Power-On

Reset

Read Pulse

A.

B.

Pin numbers shown are for DB, DBQ, DGV, DW, and PW packages.

All I/Os are set to inputs at reset.

4

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