PCA9533 Datasheet, PDF (8/18 Pages) NXP Semiconductors – 4-bit I2C LED dimmer

Philips Semiconductors
4-bit I²C LED dimmer
Product data sheet
PCA9533
Bus transactions
1 2345 6 78 9
SCL
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
start condition
R/W acknowledge
from slave
acknowledge
from slave
WRITE TO
REGISTER
DATA 1
DATA OUT
FROM PORT
Figure 10. WRITE to register
A
acknowledge
from slave
DATA 1 VALID
t_pv
SW02002
slave address
acknowledge
from slave
acknowledge
from slave
slave address
acknowledge
from slave
acknowledge
data from register ^{from master}
S 1 1 0 0 0 1 0 0 A 0 0 0 AI 0 B2 B1 B0 A S 1 1 0 0 0 1 0 1 A
R/W
R/W
at this moment master-transmitter
becomes master-receiver and
slave-receiver becomes
slave-transmitter
DATA
A
first byte
auto-increment
register address
if AI = 1
data from register
no acknowledge
from master
Figure 11. READ from register
DATA
last byte
NA P
SW02001
SDA
READ FROM
PORT
slave address
data from port
S 11 0 00 1 0 1 A
start condition
R/W acknowledge
from slave
DATA 1
data from port
A
acknowledge
from master
DATA 4
NA P
no acknowledge
from master
stop
condition
DATA INTO
PORT
DATA 1
DATA 2
DATA 3
t_ph
t_ps
NOTES:
1. This figure assumes the command byte has previously been programmed with 00h.
2. PCA9533/01 shown.
Figure 12. READ input port register
DATA 4
SW01097
2004 Oct 01
8