PCF8575 查看數據表（PDF） - NXP Semiconductors.

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PCF8575

Remote 16-bit I/O expander for I2C-bus

NXP Semiconductors. 

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SCL

SDA

S 0 1 0 0 A2 A1 A0 1 A P07 P06 P05 P04 P03 P02 P01 P00 A P17

READ FROM PORT

R/W acknowledge

from slave

acknowledge

from receiver

DATA INTO PORT

P07 to P00

INT

P17 to P10

th

P07 to P00

P17 to P10

tiv

tir

P10 A P07

acknowledge

from receiver

P07 to P00

tsu

tir

P00 A P17

acknowledge

from receiver

P17 to P10

MGL543

P10 1 P

non acknowledge

from receiver

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 latest acknowledge phase is valid (output mode). Input data is lost.

Fig.10 READ mode (input).

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