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OE is LOW to observe a change in the outputs.

If more than 5 bytes are written, previous data are overwritten.

Fig 11. Write to the 5 output ports

002aab496

0

1

0

0 A2 A1 A0 0

slave address

R/W

S

START condition

SDA

A

acknowledge

from slave

10001000

command register

AI = 1

A

acknowledge

from slave

DATA BANK 0

A

acknowledge

from slave

DATA BANK 1

A

acknowledge

from slave

DATA BANK 2

A

acknowledge

from slave

DATA BANK 3

P

STOP

condition

A

acknowledge

from slave

output bank

register bank 0

is selected

DATA BANK 4

A

acknowledge

from slave

write to port

data out from port

data valid

bank 0

data valid

bank 1

data valid

bank 2

data valid

bank 3

data valid

bank 4

OE is LOW to observe a change in the outputs.

Two, three, or four adjacent banks can be programmed by using the Auto-Increment feature (AI = 1) and change at the corresponding output port becomes effective at

each acknowledge.

Fig 12. Write to a specific output port

002aab497

0

1

0

0 A2 A1 A0 0

slave address

R/W

S

START condition

SDA

A

acknowledge

from slave

AI 0001 D2 D1 D0 A

acknowledge

from slave

DATA BANK X

A

acknowledge

from slave

P

STOP

condition

A

write to port

data out from port

data X

valid