PCA9538ABSHP 查看數據表（PDF） - NXP Semiconductors.

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PCA9538ABSHP

Low-voltage 8-bit I2C-bus I/O port with interrupt and reset

NXP Semiconductors. 

NXP Semiconductors

PCA9538A

Low-voltage 8-bit I2C-bus I/O port with interrupt and reset

8. Application design-in information

VDD

(3.3 V)

VDD

MASTER

CONTROLLER

SCL

SDA

INT

RESET

VSS

10 kΩ

10 kΩ

10 kΩ

10 kΩ

VDD

2 kΩ

PCA9538A

SCL

P0

SDA

P1

INT

P2

RESET

P3

P4

P5

A1

P6

A0

P7

VSS

100 kΩ

(× 3)(1)

SUB-SYSTEM 1

(e.g., temp sensor)

INT

SUB-SYSTEM 2

(e.g., counter)

RESET

A

enable

controlled

switch

(e.g., CBT device)

B

SUB-SYSTEM 3

(e.g., alarm system)

ALARM

VDD

002aah420

Device address is 1110 000x for this example.

P0, P2, P3 configured as outputs.

P1, P4, P5 configured as inputs.

P6, P7 are not used and need 100 k pull-up resistors to protect them from floating or the internal pull-up or pull-down

selected.

(1) Resistors are required for inputs (on P port) that may float. If a driver to an input will never let the input float, a resistor is not

needed. Outputs (in the P port) do not need pull-up resistors.

Fig 11. Typical application

PCA9538A

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 1 — 28 September 2012

© NXP B.V. 2012. All rights reserved.

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