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PCA9555

16-bit I2C-bus and SMBus I/O port with interrupt

NXP Semiconductors. 

NXP Semiconductors

PCA9555

16-bit I2C-bus and SMBus I/O port with interrupt

8. Application design-in information

VDD

(5 V)

VDD

MASTER

CONTROLLER

SCL

SDA

INT

GND

10 kΩ

10 kΩ

10 kΩ

VDD

PCA9555

SCL

SDA

IO0_0

IO0_1

IO0_2

INT

IO0_3

IO0_4

IO0_5

IO0_6

IO0_7

IO1_0

IO1_1

IO1_2

IO1_3

IO1_4

A2

IO1_5

A1

IO1_6

A0

IO1_7

VSS

2 kΩ

10 DIGIT

NUMERIC

KEYPAD

Device address configured as 0100 000xb for this example.

IO0_0, IO0_2, IO0_3 configured as outputs.

IO0_1, IO0_4, IO0_5 configured as inputs.

IO0_6, IO0_7, and IO1_0 to IO1_7 configured as inputs.

Fig 19. Typical application

SUB-SYSTEM 1

(e.g., temp sensor)

INT

SUB-SYSTEM 2

(e.g., counter)

RESET

A

ENABLE

B

controlled

switch

(e.g., CBT device)

SUB-SYSTEM 3

(e.g., alarm system)

ALARM

VDD

002aac704

PCA9555_8

Product data sheet

Rev. 08 — 22 October 2009

© NXP B.V. 2009. All rights reserved.

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