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NXP Semiconductors
PCA9633
4-bit Fm+ I 2 C-bus LED driver
slave address (1)
control register
new LED All Call I 2 C address (2)
sequence (A) S
1
1
0
0
0 A1 A0 0
A
X
X
X
0
1
1
0
0
A
1
0
1
0
1
0
1
X
A
P
START condition
R/W
acknowledge
from slave
ALLCALLADR
register selection acknowledge
from slave
Auto-Increment on
acknowledge
from slave
STOP
condition
the 16 LEDs are on at the acknowledge (3)
LED All Call I 2 C address
control register
LEDOUT register (LED fully ON)
sequence (B) S
1
0
1
0
1
0
1
0
A
X
X
X
0
1
0
0
0
A
0
1
0
1
0
1
0
1
A
P
START condition
R/W
acknowledge
from the
4 devices
LEDOUT
register selection acknowledge
from the
4 devices
acknowledge
from the
4 devices
STOP
condition
002aab424
(1) 10-pin version is used for this ?gure. Four PCA9633DP2s are used and the same sequence (A) (above) is sent to each of them.
A[1:0] = 00 to 11.
(2) ALLCALL bit in MODE1 register is equal to 1 for this example.
(3) OCH bit in MODE2 register is equal to 1 for this example.
Fig 20. LED All Call I 2 C-bus address programming and LED All Call sequence example
SWRST Call I 2 C address
SWRST data
Byte 1 = A5h
SWRST data
Byte 2 = 5Ah
S
0
0
0
0
0
1
1
0
A
1
0
1
0
0
1
0
1
A
0
1
0
1
1
0
1
0
A
P
START condition
R/W
acknowledge
from slave(s)
acknowledge
from slave(s)
acknowledge
from slave(s)
PCA9633(s) is(are) reset.
Registers are set to default power-up values.
002aab425
Fig 21. Software Reset (SWRST) Call sequence
PCA9633_5
? NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 05 — 25 July 2008
25 of 43
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