PCA9533 データシートの表示（PDF） - NXP Semiconductors.
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PCA9533 Datasheet PDF : 24 Pages
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NXP Semiconductors
7.4 Bus transactions
PCA9533
4-bit I2C-bus LED dimmer
SCL 1 2 3 4 5 6 7 8 9
slave address (PCA9533/01)
command byte
data to register
SDA S 1 1 0 0 0 1 0 0 A 0 0 0 AI 0 B2 B1 B0 A
DATA 1
A
START condition
write to register
data out from port
Fig 11. Write to register
R/W acknowledge
from slave
acknowledge
from slave
acknowledge
from slave
tv(Q)
DATA 1 VALID
002aae629
slave address (PCA9533/01)
command byte
SDA S 1 1 0 0 0 1 0 0 A 0 0 0 AI 0 B2 B1 B0 A (cont.)
START condition
R/W
acknowledge
from slave
slave address (PCA9533/01)
(cont.) S 1 1 0 0 0 1 0 1 A
(repeated)
START condition
R/W
acknowledge
from slave
Fig 12. Read from register
acknowledge
from slave
data from register
data from register
DATA (first byte)
A
DATA (last byte)
NA P
Auto-Increment
register address
if AI = 1
acknowledge
from master
no acknowledge STOP
from master condition
at this moment master-transmitter becomes master-receiver
and slave-receiver becomes slave-transmitter
002aae630
slave address (PCA9533/01)
data from port
data from port
SDA S 1 1 0 0 0 1 0 1 A
DATA 1
A
DATA 4
START condition
read from
port
data into
port
DATA 1
R/W acknowledge
from slave
acknowledge
from master
th(D)
DATA 2 DATA 3
tsu(D)
DATA 4
Remark: This figure assumes the command byte has previously been programmed with 00h.
Fig 13. Read input port register
no acknowledge
from master
NA P
STOP
condition
002aae631
PCA9533_3
Product data sheet
Rev. 03 — 27 April 2009
© NXP B.V. 2009. All rights reserved.
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