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8574TS

Remote 8-bit I/O expander for I2C-BUS

Philips Electronics 

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slave address (PCF8574)

data from port

SDA

S 0 1 0 0 A2 A1 A0 1 A

DATA 1

READ FROM

PORT

start condition

R/W acknowledge

from slave

DATA INTO

PORT

INT

t iv

DATA 2

t ph

t ir

DATA 3

data from port

A

acknowledge

from slave

DATA 4

t ps

t ir

DATA 4

1P

stop

condition

MBD975

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.

Fig.12 READ mode (input).

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