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NXP Semiconductors
data output
by transmitter
data output
by receiver
PCA9553
4-bit I 2 C-bus LED driver with programmable blink rates
not acknowledge
acknowledge
SCL from master
1
2
8
9
S
START
condition
Fig 11. Acknowledgement on the I 2 C-bus
8.4 Bus transactions
clock pulse for
acknowledgement
002aaa987
SCL
1
2
3
4
5
6
7
8
9
slave address
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
R/W
acknowledge
from slave
acknowledge
from slave
acknowledge
from slave
write to register
t v(Q)
data out from port
DATA 1 VALID
002aad746
Fig 12. Write to register
slave address
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
acknowledge
from slave
slave address
data from register
data from register
(cont.) S
1
1
0
0
0
1
0
1
A
DATA (first byte)
A
DATA (last byte)
NA P
Auto-Increment
(repeated)
START condition
R/W
acknowledge
register address
if AI = 1
acknowledge
from master
no acknowledge
from master
STOP
condition
from slave
at this moment master-transmitter becomes master-receiver
Fig 13. Read from register
PCA9553_6
and slave-receiver becomes slave-transmitter
002aad747
? NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 06 — 29 December 2008
10 of 26
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