NXP Semiconductors
ReSTART
PCA9626
24-bit Fm+ I 2 C-bus 100 mA 40 V LED driver
slave address
control register
condition
slave address
data from MODE1 register
S A6 A5 A4 A3 A2 A1 A0 0
A
1
X
0
0
0
0
0
0
A Sr A6 A5 A4 A3 A2 A1 A0 1
A
A (cont.)
START condition
R/W
acknowledge
MODE1
register selection
Auto-Increment on
acknowledge
from slave
R/W
acknowledge
acknowledge
from master
from slave
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
P
STOP
from master
condition
002aad615
This example assumes that the MODE1[5] = 0 and MODE1[6] = 0.
Fig 15. 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
1
X
1
0
0
1
1
0
A
1
0
1
0
1
0
1
X
A
P
START condition
R/W
acknowledge
from slave
ALLCALLADR
register selection
Auto-Increment on
acknowledge
from slave
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
002aad616
(1) In this example, several PCA9626s are used and the same sequence (A) (above) is sent to each of them.
(2) ALLCALL bit in MODE1 register is previously set to 1 for this example.
(3) OCH bit in MODE2 register is previously set to 1 for this example.
Fig 16. LED All Call I 2 C-bus address programming and LED All Call sequence example
PCA9626
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 6 September 2012
? NXP B.V. 2012. All rights reserved.
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