PCA9554 查看數據表（PDF） - ON Semiconductor

零件编号

产品描述 (功能)

生产厂家

PCA9554

8-bit I2C and SMBus I/O Port with Interrupt

ON Semiconductor 

PCA9554

INT: Interrupt Output

The open−drain interrupt output is activated when one of

the port pins configured as an input changes state (differs

from the corresponding input port register bit state). The

interrupt is deactivated when the input returns to its previous

Data from

Shift Register

Data from

Shift Register

Write

Configuration

Pulse

Configuration

Register

D

Q

FF

CK Q

Write Pulse

D

Q

FF

CK Q

Output Port

Register

Read Pulse

state or the input port register is read. Changing an I/O from

an output to an input may cause a false interrupt if the state

of the pin does not match the contents of the input port

register.

Q1

100 kW

Output Port

Register Data

VCC

Q2

Input Port

Register

D

Q

LATCH

CK Q

I/O0 to I/O7

VSS

Input Port

Register Data

To INT

Data from

Shift Register

Write

Polarity

Register

DQ

FF

CK Q

Polarity

Inversion Register

Figure 5. Simplified Schematic of I/O0 to I/O7

Polarity

Register Data

www.onsemi.com

6

Share Link: