PCA9554 查看數據表（PDF） - Philips Electronics

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PCA9554

8-bit I²C and SMBus I/O port with interrupt

Philips Electronics 

Philips Semiconductors

8-bit I2C and SMBus I/O port with interrupt

Product data sheet

PCA9554/PCA9554A

TYPICAL APPLICATION

VDD

(5 V)

VDD

10 kΩ

SCL

MASTER

CONTROLLER

SDA

INT

10 kΩ 10 kΩ 10 kΩ

GND

VDD

2 kΩ

I/O1

INT

I/O2

I/O3

PCA9554/

PCA9554A I/O4

I/O5

A2

I/O6

A1

I/O7

A0

VSS

NOTE: Device address configured as 0100100 for this example

I/O0, I/O1, I/O2, configured as outputs

I/O3, I/O4, I/O5, configured as inputs

I/O06, I/O7, are not used and have to be configured as outputs

Figure 11. Typcial application.

INT

RESET

SUBSYSTEM 2

(e.g. counter)

A

ENABLE

Controlled Switch

(e.g. CBT device)

B

ALARM

SUBSYSTEM 3

(e.g. alarm

system)

VDD

SW2288

2004 Sep 30

9

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