PCA9530 View Datasheet(PDF) - Philips Electronics
Part Name
Description
MFG CO.
PCA9530 Datasheet PDF : 16 Pages
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Philips Semiconductors
2-bit I2C LED dimmer
Preliminary data
PCA9530
Bus transactions
1 2345 6 78 9
SCL
slave address
command byte
data to register
SDA S 1 1 0 0 0 0 A0 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 9. WRITE to register
A
acknowledge
from slave
DATA 1 VALID
tpv
SW01014
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 0 A0 0 A 0 0 0 AI 0 B2 B1 B0 A S 1 1 0 0 0 0 A0 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
DATA
last byte
NA P
SDA
READ FROM
PORT
Figure 10. READ from register
slave address
data from port
S 1 1 0 0 0 0 A0 1 A
start condition
R/W acknowledge
from slave
DATA 1
SW01098
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
tph
tps
NOTES:
1. This figure assumes the command byte has previously been programmed with 00h.
Figure 11. READ input port register
DATA 4
SW01095
2002 Dec 12
7
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