PCA9555 查看數據表（PDF） - NXP Semiconductors.

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PCA9555

16-bit I2C-bus and SMBus I/O port with interrupt

NXP Semiconductors. 

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SCL 1 2 3 4 5 6 7 8 9

slave address

command byte

SDA S 0 1 0 0 A2 A1 A0 0 A 0 0 0 0 0 0 1 0 A 0.7

data to port 0

DATA 0

0.0 A 1.7

data to port 1

DATA 1

1.0 A P

START condition

R/W acknowledge

from slave

acknowledge

from slave

acknowledge

from slave

STOP

condition

write to port

data out

from port 0

data out

from port 1

Fig 10. Write to Output port registers

tv(Q)

tv(Q)

DATA VALID

002aac220

SCL 1 2 3 4 5 6 7 8 9

slave address

command byte

MSB

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

data to register

DATA 0

LSB MSB

A

data to register

DATA 1

LSB

AP

START condition

R/W acknowledge

from slave

Fig 11. Write to Configuration registers

acknowledge

from slave

acknowledge

from slave

STOP

condition

002aac221

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