PCA9553 Philips Semiconductors, PCA9553 Datasheet - Page 8

• Manufacturer Part Number: PCA9553
• Description: 4-bit I2C LED driver with programmable blink rates
• Manufacturer: Philips Semiconductors

1. This figure assumes the command byte has previously been programmed with 00h.
2. PCA9553/01 shown.
Philips Semiconductors
Bus transactions
NOTES:
2004 Oct 01
S
4-bit I
READ FROM
FROM PORT
DATA INTO
1
REGISTER
DATA OUT
WRITE TO
PORT
PORT
1
SDA
SDA
SCL
2
0
slave address
C LED driver with programmable blink rates
start condition
0
S
1
start condition
0
1
S
1
2
1
1
0
acknowledge
from slave
3
0
slave address
1
R/W
0
4
0
0
slave address
A
DATA 1
5
0
0
0
6
1
0
0
0
7
1
0
R/W
0
8
AI
0
t
R/W
ph
Figure 12. READ input port register
A
acknowledge
from slave
0
9
1
Figure 11. READ from register
Figure 10. WRITE to register
B2 B1
0
A
acknowledge
from slave
0
acknowledge
from slave
DATA 2
B0
0
command byte
A
AI
at this moment master-transmitter
becomes master-receiver and
slave-receiver becomes
slave-transmitter
8
S
data from port
0
DATA 1
1
DATA 3
B2
1
B1
slave address
0
B0
0
A
acknowledge
from slave
t
0
ps
A
1
acknowledge
from master
0
acknowledge
from slave
R/W
1
data to register
A
DATA 1
data from port
DATA 4
data from register
DATA 4
last byte
data from register
DATA
no acknowledge
from master
first byte
DATA
t
pv
PCA9553
Product data sheet
A
acknowledge
from slave
no acknowledge
from master
auto-increment
register address
if AI = 1
DATA 1 VALID
NA
acknowledge
from master
NA
SW02002
SW01097
SW02001
P
stop
condition
P
A