PCF8574AT 参数 Datasheet PDF下载

1997 Apr 02

data from port

data from port

0

DATA 4

A2

A1

A0

1

A

DATA 1

A

1

P

R/W

acknowledge

from slave

acknowledge

from slave

stop

condition

Philips Semiconductors

slave address (PCF8574)

SDA

S

0

1

0

start condition

Remote 8-bit I/O expander for I

2

C-bus

READ FROM

PORT

10

DATA 2

t ph

t ps

DATA 3

DATA 4

t ir

t ir

MBD975

DATA INTO

PORT

INT

t iv

A LOW-to-HIGH transition of SDA, while SCL is HIGH is defined as the stop condition (P). Transfer of data can be stopped at any moment by a stop condition. When this occurs, data present

at the last acknowledge phase is valid (output mode). Input data is lost.

PCF8574

Product specification

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Fig.11 READ mode (input).