pca9685 NXP Semiconductors, pca9685 Datasheet - Page 33

• Manufacturer Part Number: pca9685
• Description: 16-channel, 12-bit Pwm Fm+ I 2c-bus Led Controller
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCA9685_1
Product data sheet
Fig 25. LED All Call I
(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
sequence (A)
sequence (B)
sequence (C)
(cont.)
(1)
(1)
S
S
S
START condition
START condition
START condition
LEDALLCALL I
1
1
1
0
2
C-bus address programming and LED All Call sequence example
devices configured for the new
LEDALLCALL I
A5 A4 A3 A2 A1 A0 0
A5 A4 A3 A2 A1 A0 0
0
0
ALL_LED_ON_H
slave address
slave address
acknowledge
control register
1
0
0
0
2
C-bus address
1
0
2
acknowledge
(2)
C-bus address
0
0
acknowledge
acknowledge
from all the
from slave
from slave
from slave
1
0
R/W
R/W
R/W
0
0
(2)
A
A
A
A
Rev. 01 — 24 July 2008
0
0
1
0
data for ALL_LED_OFF_L
0
0
1
0
register selection
register selection
register selection
ALL_LED_ON_L
control register
ALLCALLADR
control register
control register
control register
0
0
1
0
MODE1
0
0
1
0
16-channel, 12-bit PWM Fm+ I
0
0
1
0
0
1
0
0
0
0
1
0
0
1
0
0
2
A
A
A
A
acknowledge
from slave
acknowledge
from slave
acknowledge
from slave
acknowledge
from slave
C-bus address in sequence (B).
new LEDALLCALL I
0
1
0
0
data for MODE1 register
data for control register
0
0
0
0
ALL_LED_OFF_H
AI on
ALL_LED_ON_L
1
1
0
0
(2)
(2)
0
0
0
0
enable ALL CALL
0
1
0
1
2
C-bus address
acknowledge
acknowledge
1
0
0
0
acknowledge
acknowledge
2
C-bus LED controller
from slave
from slave
from slave
from slave
1
1
0
0
PCA9685
© NXP B.V. 2008. All rights reserved.
X
1
0
0
(2)
(2)
A
A
A
A
002aad192
P
P
(cont.)
P
STOP
condition
STOP
condition
STOP
condition
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