PCA9535A 查看數據表（PDF） - NXP Semiconductors.

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PCA9535A

Low-voltage 16-bit I2C-bus I/O port with interrupt

NXP Semiconductors. 

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data into port 0

data into port 1

INT

tv(INT)

trst(INT)

SCL 1 2 3 4 5 6 7 8 9

R/W

slave address

I0.x

I1.x

I0.x

I1.x

STOP condition

SDA S 0 1 0 0 A2 A1 A0 1 A 7 6 5 4 3 2 1 0 A 7 6 5 4 3 2 1 0 A 7 6 5 4 3 2 1 0 A 7 6 5 4 3 2 1 0 1 P

START condition

read from port 0

acknowledge

from slave

acknowledge

from master

acknowledge

from master

acknowledge

from master

non acknowledge

from master

read from port 1

002aah375

Remark: 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). It

is assumed that the command byte has previously been set to ‘00’ (read input port register).

This figure eliminates the command byte transfer and a restart between the initial slave address call and the actual data transfer from P port (see Figure 9).

Fig 10. Read input port register, scenario 1

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