pca9685 NXP Semiconductors, pca9685 Datasheet - Page 31

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

NXP Semiconductors
9. Bus transactions
PCA9685_1
Product data sheet
Fig 20. Write to a specific register
Fig 21. Write to all registers using the Auto-Increment feature; AI initially clear
(cont.)
S
START condition
(1) See
1
A5 A4 A3 A2 A1 A0 0
LED15_OFF_L register
slave address
Table 3
S
START condition
1
for register definition.
A5 A4 A3 A2 A1 A0 0
acknowledge
slave address
from slave
R/W
A
acknowledge
from slave
A
control register = MODE1 register
0
LED15_OFF_H register
0
R/W
0
0
A
acknowledge
from slave
D7
0
acknowledge
Rev. 01 — 24 July 2008
D6 D5 D4 D3 D2 D1 D0
0
from slave
acknowledge
from slave
control register
0
condition
0
STOP
A
A
P
16-channel, 12-bit PWM Fm+ I
MODE1 register
AI bit set
1
A
acknowledge
from slave
data for register D[7:0]
A
acknowledge
from slave
acknowledge
MODE2 register
from slave
(1)
2
C-bus LED controller
condition
002aac829
PCA9685
STOP
A
© NXP B.V. 2008. All rights reserved.
acknowledge
P
from slave
A
002aad187
31 of 50
(cont.)