PCA9505_10 Datasheet, PDF (16/34 Pages) NXP Semiconductors – 40-bit I2C-bus I/O port with RESET, OE and INT

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slave address
command register
STOP
condition
SDA S 0 1 0 0 A2 A1 A0 0 A 1 0 0 0 1 0 0 0 A DATA BANK 0 A DATA BANK 1 A DATA BANK 2 A DATA BANK 3 A DATA BANK 4 A P
START condition
R/W AI = 1
acknowledge
from slave
output bank
register bank 0
is selected
acknowledge
from slave
acknowledge
from slave
acknowledge
from slave
acknowledge
from slave
acknowledge
from slave
acknowledge
from slave
write to port
data out from port
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
t_v(Q)
data valid
bank 0
data valid
bank 1
data valid
bank 2
data valid
bank 3
data valid
bank 4
002aab496