PCA8575 Просмотр технического описания (PDF) - NXP Semiconductors.

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PCA8575

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

NXP Semiconductors. 

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SCL 1 2 3 4 5 6 7 8 9

SDA

S 0 1 0 0 A2 A1 A0 1 A

START condition

read from port 0

R/W

acknowledge

from slave

P0x

DATA 00

A

acknowledge

from master

P1x

DATA 11

A

acknowledge

from master

P0x

DATA 00

A

acknowledge

from master

P1x

DATA 12

1P

no acknowledge

from master

data into port 0

read from port 1

DATA 00

data into port 1

DATA 10

DATA 11

DATA 12

INT

tv(D)

td(rst)

002aab810

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).

Fig 12. Read input port register, scenario 1

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