pca9685 NXP Semiconductors, pca9685 Datasheet - Page 32

• 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 22. Read all registers using the Auto-Increment feature; AI initially clear
Fig 23. Write to ALL_LED_ON and ALL_LED_OFF registers using the Auto-Increment feature; AI initially set
Fig 24. Write to ALL_LED_OFF_H to turn OFF all PWMs
(cont.)
S
START condition
1
A5 A4 A3 A2 A1 A0 0
ALL_LED_OFF_L register
slave address
(cont.)
ReSTART
S
START condition
condition
S
START condition
data from LED15_OFF_H register
1
1
Sr
A5 A4 A3 A2 A1 A0 0
slave address
A5 A4 A3 A2 A1 A0 0
acknowledge
1
slave address
from slave
A5 A4 A3 A2 A1 A0 1
R/W
slave address
not acknowledge
A
acknowledge
from slave
A
from master
1
ALL_LED_OFF_H register
ALL_LED_ON_L register
R/W
1
R/W
control register =
1
A
A
acknowledge
from slave
R/W
control register = MODE1 register
1
A
acknowledge
from slave
STOP
condition
0
P
1
1
A
acknowledge
from slave
acknowledge
0
ALL_LED_OFF_H register
Rev. 01 — 24 July 2008
0
from slave
1
acknowledge
0
control register =
from slave
1
1
data from MODE1
0
0
1
A
0
A
1
P
STOP condition
0
16-channel, 12-bit PWM Fm+ I
acknowledge
1
ALL_LED_ON_L register
acknowledge
from slave
0
acknowledge
from slave
from master
0
0
1
A
A
A
0
AI bit set
acknowledge
ALL_LED_OFF_H register
MODE1 register
from slave
0
1
data from MODE2
0
1
A
acknowledge
X
ALL_LED_ON_H register
from slave
acknowledge
X
from master
acknowledge
from slave
X
2
A
C-bus LED controller
X
condition
002aad190
(cont.)
A
PCA9685
STOP
A
© NXP B.V. 2008. All rights reserved.
002aad188
acknowledge
P
from slave
A
002aad189
32 of 50
(cont.)