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NXP Semiconductors
PCA9685
16-channel, 12-bit PWM Fm+ I 2 C-bus LED controller
slave address
control register
data for MODE1 register
sequence (A) (1) S
1 A5 A4 A3 A2 A1 A0 0
A
0
0
0
0
0
0
0
0
A
0
0
1
0
0
1
1
1
A
P
START condition
R/W
acknowledge
MODE1
register selection
AI on
acknowledge
enable ALL CALL
acknowledge
STOP
condition
from slave
from slave
from slave
slave address
control register
new LEDALLCALL I 2 C-bus address
sequence (B) (1) S
1 A5 A4 A3 A2 A1 A0 0
A
0
0
0
0
0
1
0
1
A
1
0
1
0
1
0
1
X
A
P
START condition
R/W
acknowledge
ALLCALLADR
register selection
acknowledge
from slave
acknowledge
from slave
STOP
condition
from slave
data for control register
LEDALLCALL I 2 C-bus address
control register
ALL_LED_ON_L
sequence (C) S
1
0
1
0
1
0
1
0
A
1
1
1
1
1
0
1
0
A
0
0
0
0
0
0
0
0
A
(cont.)
START condition R/W
acknowledge (2) from all the
ALL_LED_ON_L
register selection
acknowledge (2)
from slave
acknowledge (2)
from slave
devices configured for the new
LEDALLCALL I 2 C-bus address
ALL_LED_OFF_H
(cont.)
0
0
0
0
0
0
0
0
A
0
0
0
0
0
0
0
0
A
0
0
0
0
1
0
0
0
A
P
ALL_LED_ON_H
control register
acknowledge (2)
data for ALL_LED_OFF_L
control register
acknowledge (2)
from slave
acknowledge (2)
from slave
STOP
condition
from slave
002aad192
(1) In this example, several PCA9685s are used and the same sequences (A) and (B) above are sent to each of them.
(2) Acknowledge from all the slave devices configured for the new LED All Call I 2 C-bus address in sequence (B).
Fig 25. LED All Call I 2 C-bus address programming and LED All Call sequence example
PCA9685
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 2 September 2010
? NXP B.V. 2010. All rights reserved.
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