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NXP Semiconductors
ReSTART
PCA9634
8-bit Fm+ I 2 C-bus LED driver
slave address
control register
condition
slave address
data from MODE1 register
S A6 A5 A4 A3 A2 A1 A0 0
A
1
0
0
0
0
0
0
0
A Sr A6 A5 A4 A3 A2 A1 A0 1
A
A (cont.)
START condition
R/W
acknowledge
Auto-Increment
on all registers
MODE1
register
selection
acknowledge
from slave
R/W
acknowledge
acknowledge
from master
from slave
Auto-Increment on
data from
from slave
data from
data from MODE2 register
data from PWM0
ALLCALLADR register
MODE1 register
(cont.)
A
acknowledge
from master
A
acknowledge
from master
A
acknowledge
from master
A (cont.)
acknowledge
from master
data from last read byte
(cont.)
A
not acknowledge
from master
P
STOP
condition
002aac144
Fig 16. Read all registers using the Auto-Increment feature
slave address (1)
control register
new LED All Call I 2 C address (2)
sequence (A) S A6 A5 A4 A3 A2 A1 A0 0
A
X
X
X
1
0
0
0
1
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
002aac145
(1) In this example, several PCA9634s are used and the same sequence (A) (above) is sent to each of them.
(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 17. LED All Call I 2 C-bus address programming and LED All Call sequence example
PCA9634_6
? NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 06 — 12 September 2008
23 of 38
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