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

12 345 678

slave address (PCF8575)

Integral multiples of two bytes

data to port 0

data to port 1

SDA S 0 1 0 0 A2 A1 A0 0 A P07 P06 1

P00 A P17

start condition

WRITE TO

PORT

R/W acknowledge P05

from slave

acknowledge

from slave

P10 A

acknowledge

from slave

DATA OUTPUT

FROM PORT

P05 OUTPUT

VOLTAGE

P05 PULL-UP

OUTPUT CURRENT

INT

Data A0 and

B0 valid

tpv

IOHt

IOH

tir

MGL542

Fig.9 WRITE mode (output).

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