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PDF PCA9685 Data sheet ( Hoja de datos )
| Número de pieza | PCA9685 | |
| Descripción | 12-bit PWM Fm I2C-bus LED controller | |
| Fabricantes | NXP Semiconductors | |
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PCA9685
16-channel, 12-bit PWM Fm+ I2C-bus LED controller
Rev. 4 — 16 April 2015
Product data sheet
1. General description
The PCA9685 is an I2C-bus controlled 16-channel LED controller optimized for
Red/Green/Blue/Amber (RGBA) color backlighting applications. Each LED output has its
own 12-bit resolution (4096 steps) fixed frequency individual PWM controller that operates
at a programmable frequency from a typical of 24 Hz to 1526 Hz with a duty cycle that is
adjustable from 0 % to 100 % to allow the LED to be set to a specific brightness value.
All outputs are set to the same PWM frequency.
Each LED output can be off or on (no PWM control), or set at its individual PWM controller
value. The LED output driver is programmed to be either open-drain with a 25 mA current
sink capability at 5 V or totem pole with a 25 mA sink, 10 mA source capability at 5 V. The
PCA9685 operates with a supply voltage range of 2.3 V to 5.5 V and the inputs and
outputs are 5.5 V tolerant. LEDs can be directly connected to the LED output (up to
25 mA, 5.5 V) or controlled with external drivers and a minimum amount of discrete
components for larger current or higher voltage LEDs.
The PCA9685 is in the new Fast-mode Plus (Fm+) family. Fm+ devices offer higher
frequency (up to 1 MHz) and more densely populated bus operation (up to 4000 pF).
Although the PCA9635 and PCA9685 have many similar features, the PCA9685 has
some unique features that make it more suitable for applications such as LCD or LED
backlighting and Ambilight:
• The PCA9685 allows staggered LED output on and off times to minimize current
surges. The on and off time delay is independently programmable for each of the
16 channels. This feature is not available in PCA9635.
• The PCA9685 has 4096 steps (12-bit PWM) of individual LED brightness control. The
PCA9635 has only 256 steps (8-bit PWM).
• When multiple LED controllers are incorporated in a system, the PWM pulse widths
between multiple devices may differ if PCA9635s are used. The PCA9685 has a
programmable prescaler to adjust the PWM pulse widths of multiple devices.
• The PCA9685 has an external clock input pin that will accept user-supplied clock
(50 MHz max.) in place of the internal 25 MHz oscillator. This feature allows
synchronization of multiple devices. The PCA9635 does not have external clock input
feature.
• Like the PCA9635, PCA9685 also has a built-in oscillator for the PWM control.
However, the frequency used for PWM control in the PCA9685 is adjustable from
about 24 Hz to 1526 Hz as compared to the typical 97.6 kHz frequency of the
PCA9635. This allows the use of PCA9685 with external power supply controllers. All
bits are set at the same frequency.
• The Power-On Reset (POR) default state of LEDn output pins is LOW in the case of
PCA9685. It is HIGH for PCA9635.
1 page  
NXP Semiconductors
5. Block diagram
PCA9685
16-channel, 12-bit PWM Fm+ I2C-bus LED controller
SCL
SDA
VDD
VSS
EXTCLK
OE
PCA9685
INPUT FILTER
POWER-ON
RESET
PRESCALE
25 MHz
OSCILLATOR
CLOCK
SWITCH
A0 A1 A2 A3 A4 A5
I2C-BUS
CONTROL
PWM
REGISTER X
BRIGHTNESS
CONTROL
LED
STATE
SELECT
REGISTER
'0' – permanently OFF
'1' – permanently ON
Remark: Only one LED output shown for clarity.
Fig 1. Block diagram of PCA9685
VDD
MUX/
CONTROL
LEDn
002aac824
PCA9685
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 4 — 16 April 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
5 of 52
5 Page 
NXP Semiconductors
PCA9685
16-channel, 12-bit PWM Fm+ I2C-bus LED controller
Table 4. Register summary …continued
Register # Register # D7 D6 D5 D4 D3 D2 D1 D0 Name
(decimal) (hex)
22 16 0 0 0 1 0 1 1 0 LED4_ON_L
23 17 0 0 0 1 0 1 1 1 LED4_ON_H
24 18 0 0 0 1 1 0 0 0 LED4_OFF_L
25 19 0 0 0 1 1 0 0 1 LED4_OFF_H
26 1A 0 0 0 1 1 0 1 0 LED5_ON_L
27 1B 0 0 0 1 1 0 1 1 LED5_ON_H
28 1C 0 0 0 1 1 1 0 0 LED5_OFF_L
29 1D 0 0 0 1 1 1 0 1 LED5_OFF_H
30 1E 0 0 0 1 1 1 1 0 LED6_ON_L
31 1F 0 0 0 1 1 1 1 1 LED6_ON_H
32 20 0 0 1 0 0 0 0 0 LED6_OFF_L
33 21 0 0 1 0 0 0 0 1 LED6_OFF_H
34 22 0 0 1 0 0 0 1 0 LED7_ON_L
35 23 0 0 1 0 0 0 1 1 LED7_ON_H
36 24 0 0 1 0 0 1 0 0 LED7_OFF_L
37 25 0 0 1 0 0 1 0 1 LED7_OFF_H
38 26 0 0 1 0 0 1 1 0 LED8_ON_L
39 27 0 0 1 0 0 1 1 1 LED8_ON_H
40 28 0 0 1 0 1 0 0 0 LED8_OFF_L
41 29 0 0 1 0 1 0 0 1 LED8_OFF_H
Type
Function
read/write
read/write
read/write
read/write
read/write
read/write
read/write
read/write
read/write
read/write
read/write
read/write
read/write
read/write
read/write
read/write
read/write
read/write
read/write
read/write
LED4 output and
brightness control byte 0
LED4 output and
brightness control byte 1
LED4 output and
brightness control byte 2
LED4 output and
brightness control byte 3
LED5 output and
brightness control byte 0
LED5 output and
brightness control byte 1
LED5 output and
brightness control byte 2
LED5 output and
brightness control byte 3
LED6 output and
brightness control byte 0
LED6 output and
brightness control byte 1
LED6 output and
brightness control byte 2
LED6 output and
brightness control byte 3
LED7 output and
brightness control byte 0
LED7 output and
brightness control byte 1
LED7 output and
brightness control byte 2
LED7 output and
brightness control byte 3
LED8 output and
brightness control byte 0
LED8 output and
brightness control byte 1
LED8 output and
brightness control byte 2
LED8 output and
brightness control byte 3
PCA9685
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 4 — 16 April 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
11 of 52
11 Page | ||
| Páginas | Total 30 Páginas | |
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