PCA9685 demonstration board OM13332

UM10574
PCA9685 demonstration board OM13332
Rev. 1 — 1 April 2014
User manual
Document information
Info
Content
Keywords
Fm+ I2C-bus, PCA9685, RGB and White LEDs, 16 channel x 12-bit PWMs
Abstract
The OM13332 is an add-on to 9-pin connector of the NXP I2C demo board 2005-1
or Fm+ I2C Bus development board. This daughter board makes it easy to test
and design with the PCA9685, 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. 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. This demo board, along with the
Win-I2CUSB Lite GUI (PC based), provides an easy to use evaluation platform.
UM10574
NXP Semiconductors
PCA9685 demonstration board OM13332
Revision history
Rev
Date
Description
1.0
20140401
user manual; initial release
Contact information
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: [email protected]
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1. Introduction
The PCA9685 evaluation board features LEDs for color backlighting and Ambilight
demonstrations. A graphical interface allows the user to explore the different functions of
the driver easily. The board can be connected in series with other I2C demo-boards to
create an evaluation system.
The IC communicates to the host via the industry standard I2C-bus/SMBus port. The
evaluation software runs under Microsoft Windows PC platform.
2. Features
• A complete evaluation platform for the PCA9685 16-channel, 12-bit PWM Fm+
I2C-bus 25 mA voltage switch LED driver
•
•
•
•
•
Easy to use GUI-based software demonstrates the capabilities of the PCA9685
On-board RGB and White LEDs for visual experience
Convenient test points for easy scope measurements and signal access
USB interface to the host PC
No external power supply required
3. Getting started
3.1 Assumptions
Familiarity with the I2C-bus is helpful but not required.
3.2 Static handling requirements
CAUTION
This device is sensitive to ElectroStatic Discharge (ESD). Therefore care should be taken
during transport and handling. You must use a ground strap or touch the PC case or other
grounded source before unpacking or handling the hardware.
3.3 Minimum system requirements
•
•
•
•
PC Pentium 60 processor (or equivalent), 8 MB RAM, 10 MB of hard drive space
One USB port (either 2.0 or 1.1 compatible)
Windows 98SE, ME, 2000, XP, or Vista
I2C demonstration board 2005-1 (OM6275) or WIN-I2CUSB board (from
www.demoboard.com).
3.4 Power requirements
The NXP demonstration board I2C 2005-1 and OM13332 hardware obtain power from the
PC USB port. Take care not to exceed the USB port current capabilities.
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4. Installation
4.1 I2C demo board 2005-1 and WIN-I2CUSB Lite software
The OM13332 is a daughter card to the OM6275 I2C demo board 2005-1. You can
download the WIN-I2CUSB Lite Software, the OM6275 user manual UM10206, and find
ordering information at the NXP web site www.nxp.com/demoboard/OM6275.html.
The Win-I2CUSB Lite software from The Boardshop runs on Windows 98SE, ME, 2000,
and XP, and is compatible with any PC hardware having a minimum of a Pentium
processor and a USB port. The software allows the user to select one of the I2C-bus
devices on the board from a menu and also provides a Universal mode (I2C Expert mode)
to allow users to create their own I2C-bus commands with the same I2C-bus devices.
4.2 OM13332 connection to I2C demo board 2005-1
The I2C demo board 2005-1 should be disconnected from your PC before mounting the
OM13332 board on to it. The OM13332 board has a 9-pin female connector (J2) that
connects to the JP1 male connector on the I2C demo board 2005-1 as shown in Figure 1.
With both boards facing you, with USB connector on the left-hand side as shown in
Figure 1, connect the OM13332 board to the I2C demo board 2005-1 before connecting
the USB cable. Once the board is connected, connect the USB cable and start the
WIN-I2CUSB Lite software. You are now ready to evaluate the PCA9685.
Fig 1.
PCA9685 demo board (OM13332) mounting to the I2C demo board 2005-1 (OM6275)
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4.3 OM13332 connection to Win-I2CUSB hardware adapter board
The Win-I2CUSB board should be disconnected from your PC before connecting the
OM13332 board on to it. The OM13332 board has a 14-pin male connector (J4) that
connects to the 14-pin male connector (J1) on the Win-I2CUSB board as shown in
Figure 2.
Connect the OM13332 board to the Win-I2CUSB board before connecting the USB cable.
Once the board is connected, connect the USB cable and start the WIN-I2CUSB Lite
software. You are now ready to evaluate the PCA9685.
Fig 2.
PCA9685 demo board (OM13332) connecting to the Win-I2CUSB board
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5. Hardware description
Fig 3.
PCA9685 demo board (OM13332)
Figure 3 shows the following items on the hardware:
• J2 (9-pin) is for connection to JP1 on I2C demo board 2005-1.
• J3 (9-pin male) is for connection to the second PCA9685 demo board or I2C-bus
device.
• J1 selects VDD power for PCA9685, connected 1-2 for VDD = 3.3 V and connected 2-3
for VDD = 5 V.
• S1 8-position DIP switch to select I2C-bus address A[0:5] = S1[1:6] for this device
(default is 0x80, all switches S1[1:6] are ON position). S1[7] is used to control output
enable (/OE, default is ON position to enable LED outputs), S1[8] is used to control
EXTCLK (default is ON position to disable the EXTCLK).
• J4 (14-pin) is for connection to J1 on Win-I2CUSB board.
• 4-channel to drive four White LEDs (D2, D4, D6, D9) and 12-channel to drive four
RGB LEDs (D3, D5, D7, D8).
• /OE (TP1) is input to drive output enable (pin 23) when S1[7] is set to OFF position.
• EXTCLK (TP2) is input to EXTCLK (pin 25) when S1[8] is set to OFF position.
• J5 and J6 are GND pins for probing use.
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xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxx xxxxx x x
9-pin female
connector
+5 V
+5 V
TP1
1
2
3
+3.3 V
+5 V
SCL_1
C1
10 μF
1 /OE
R8
R7
R6
R5
R4
VDD_IN
1 EXTCLK
Rev. 1 — 1 April 2014
SW1
SW DIP-8
SDA_1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
A0
A1
A2
A3
A4
LED0
LED1
LED2
LED3
LED4
LED5
LED6
LED7
VSS
VDD
SDA
SCL
EXTCLK
A5
/OE
LED15
LED14
LED13
LED12
LED11
LED10
LED9
LED8
28
27
26
25
24
23
22
21
20
19
18
17
16
15
SDA filter
SCL filter
EXTCLK
A5
/OE
LED15
LED14
LED13
LED12
LED11
LED10
LED9
LED8
C6
4.7 μF
C5
0.1 μF
J2
R9
1 kΩ
14-pin connector to/from WIN-I2CUSB
Fm+ I2C master to drive PCA9685
D1
LTST-C170KGKT
J4
GND
+3.3 V
PCA9685PW
3
2
1
VP for I2C pull-up VDD
on WIN-I2CUSB board
2 (VP) VDO_IN
SCL_1
4
6
GND
SDA_1
8
10
12
14
+5 V
1
3
5
7
9
11
13
HEADER 7x2/SM
I2CUSB CONNECTOR
GND
3
2
1
+5 V
LED0
R10
440 Ω
LED1
R11
1.16 kΩ
LED2
R12
720 Ω
LED3
R13
720 Ω
LED4
R14
440 Ω
LED5
R15
1.16 kΩ
R16
720 Ω
R17
720 Ω
LED8
R18
440 Ω
LED9
R19
1.16 kΩ
LED10
R20
720 Ω
LED11
R21
720 Ω
LED12
R22
440 Ω
LED13
R23
1.16 kΩ
LED14
R24
720 Ω
LED15
R25
720 Ω
limited the current to 2.5 mA
white LED VF = 3.9 V
red LED VF = 2.1 V
green/blue LED VF = 1.8 V
U2
1
LW-E67C-white
D3 LED[1:3]
A1
C2
A2
2
C1
C3
A3
L1
BLM18BD471SN1
D7
A1
C2
A2
D8 LED[13:15]
A1
C2
A2
C1
C3
A3
LED[9:11]
C1
C3
A3
I/O1
I/O2
4
3
+5 V
LED4
GND
C23
0.01 μF
PRTR5V0U2AX
SDA-filter
L2
BLM18BD471SN1
SCL_1
D5 LED[5:7]
C1
C3
A3
VCC
SDA_1
LRTB_G6SG
A1
C2
A2
GND
D4
SCL-filter
(470 Ω at 100 MHz)
LW-E67C-white
LRTB_G6SG
close to 9-pin connector J3
LED8
D6
U3
1
LW-E67C-white
2
LRTB_G6SG
LED12
L3
BLM18BD471SN1
D9
SDA_2
GND
VCC
I/O1
I/O2
4
3
+5 V
C24
0.01 μF
PRTR5V0U2AX
SDA-filter
LW-E67C-white
L4
BLM18BD471SN1
LRTB_G6SG
SCL_2
SCL-filter
(470 Ω at 100 MHz)
019aac802
Fig 4.
PCA9685 demo board schematic
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LED6
LED7
close to connector J2/J4
D2
LED0
C7
C8
C9
C10
C11
C12
C13
C14
C15
C16
C17
C18
C19
C20
C21
C22
0.1 nF 0.1 nF 0.1 nF 0.1 nF 0.1 nF 0.1 nF 0.1 nF 0.1 nF 0.1 nF 0.1 nF 0.1 nF 0.1 nF 0.1 nF 0.1 nF 0.1 nF 0.1 nF
J6
PCA9685 demonstration board OM13332
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(external clock in)
C2
GND
10 μF
U1
A0
A1
A2
A3
A4
A5
LED0
LED1
LED2
(switched to GND when
LED3
external clock is not used) LED4
LED5
LED6
LED7
(output enable)
TP2
+3.3 V
10 kΩ
10 kΩ
10 kΩ
10 kΩ
10 kΩ
10 kΩ
10 kΩ
10 kΩ
C4
10 μF
R3
C3
10 μF
R2
SCL_2
GND
SDA_2
J3
J5
1
2
3
4
5
6
7
8
9
J1
VDD_IN
+3.3 V
R1
1
2
3
4
5
6
7
8
9
NXP Semiconductors
9-pin connector to/from I2C 2005-1
or to/from PCA9685 demo board
6. Schematic
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9-pin connector to/from I2C 2005-1
or to/from PCA9685 demo board
9-pin female
connector
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PCA9685 demonstration board OM13332
7. OM13332 demonstration board main components
Table 1.
OM13332 demo board main components
Device
Description
Address/LED output
Location
PCA9685PW
16-channel, 12-bit PWM Fm+ I2C-bus
25 mA voltage switch LED driver
0x80 for I2C demo board 2005-1
interface
U1
LW-E67C
White LED
LED0, LED4, LED8, LED12
D2, D4, D6, D9
LRTB_G6SG
RGB LED
LED1, LED2, LED3
D3
LRTB_G6SG
RGB LED
LED5, LED6, LED7
D5
LRTB_G6SG
RGB LED
LED9, LED10, LED11
D7
LRTB_G6SG
RGB LED
LED13, LED14, LED15
D8
LTST-C170KGKT
Green LED for PCA9685 power supply
either 3.3 V or 5 V indicator
-
D1
8. PCA9685 evaluation steps
The PCA9685 functions are controlled by WIN-I2CUSB Lite GUI. Refer to the PCA9685
data sheet for additional information on the registers and functionality.
Connect the hardware as described in Section 4. The PCA9685 demo board address is
set to 0x80 on DIP switch (S1) as A[0:5] = S1[1:6] = 000000 (0 → ON, 1 → OFF). When
you have correctly installed the software and the demonstration board hardware is
connected and recognized by the computer, start the Win-I2CUSB Lite software. As
shown in Figure 5, when the demonstration board hardware is correctly connected to the
USB port and the computer recognizes it, the message ‘Hardware Detected’ is displayed
on the bottom of the window.
Switched 3.3 V and 5.0 V power supplies are controlled through the ‘Options’ menu or by
double-clicking on the 3.3 V or 5.0 V symbols on the bottom of the window. Power
supplies are disabled by default and you must enable them before using the I2C-bus
devices on the board. I2C-bus frequency is controlled through the ‘Options’ menu or by
double-clicking the frequency symbol on the bottom of the window.
8.1 Dimming and brightness control for individual LED
The PCA9685 has 4096 steps (12-bit PWM) of individual LED brightness control to vary
from fully off (default) to maximum brightness. The LED output frequency (all LEDs)
typically varies from 24 Hz to 1526 Hz (default of 1Eh in PRE_SCALE register results in a
197 Hz refresh rate with oscillator clock of 25 MHz). The duty cycle of PWM can be
controlled independently using the ‘LEDn ON’ and ‘LEDn OFF’ registers. The resolution
for the phase shift is 1⁄4096 of the target frequency.
1. From the ‘Device’ drop-down menus, select ‘LED Blinkers and Dimmers’, and from
the subsequent drop-down menu select ‘PCA9685 16-channel LED Driver with 12-bit
PWM’ as shown in Figure 5.
2. The device address is set to ‘80’ hexadecimal and cannot change. Check the ‘Auto
Write On’ box (lower left), uncheck the ‘Low-power mode (oscillator off)’ box to enable
the device to ‘Normal mode’ (upper left).
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3. For LED output that directly connects to LED as the demo board design, the INVRT
bit in MODE2 register must be set to 1 by checking the ‘Output not inverted’ to ‘Output
inverted’ and the OUTDRV bit in MODE2 register must be set to 0 by checking the
‘Totem pole outputs’ to ‘Open-drain outputs’ to make sure all LEDs are completed
OFF state as shown in Figure 6.
4. The device configuration screen is displayed by clicking the following options:
– ‘PWM 0 to 3’ individual brightness control for LED0 to LED3
– ‘PWM 4 to 7’ individual brightness control for LED4 to LED7
– ‘PWM 8 to 11’ individual brightness control for LED8 to LED11
– ‘PWM 12 to 15’ individual brightness control for LED12 to LED15
– ‘Control Registers’ all LED[0:15] brightness control and Prescale for all LEDs
output frequency as shown in Figure 7
5. In Figure 6, uncheck the ‘LEDn Full Off’ box (lower bottom), adjust both ‘LEDn ON’
and ‘LEDn OFF’ bar for dimming/brightness effect, also move LED1 ON/OFF to
control red, LED2 ON/OFF to control green, LED3 ON/OFF to control blue for color
mixing.
Remark: The LED ON time, which is programmable, is the time to assert the LED output
and the LED OFF time, which is also programmable, is the time to negate the LED output.
Fig 5.
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Drop-down menu selections
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Fig 6.
Device configuration screen for PWM0 to PWM3
Fig 7.
Device configuration screen Control registers
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8.2 Dimming and brightness control for all LEDs and Prescale
The following steps to control dimming/brightness for all LEDs and adjust output
frequency with prescale value:
1. Click the ‘Control Registers’ configuration screen for all LED[0:15] brightness control
and Prescale for LEDs output frequency as shown in Figure 7.
2. In Figure 7, uncheck the ‘All LED Full Off’ box (lower bottom), adjust both ‘All LED ON’
and ‘All LED OFF’ bar for all LEDs dimming/brightness effect.
3. Adjust the ‘PRESCALE’ bar to program the LED output frequency (PWM) as shown
below:
– LED output frequency = (25 MHz or EXTCLK) ÷ (4096 × (prescale + 1))
– When Prescale = 0x1E (default is 30), the LED output frequency is
(25 × 106) ÷ (4096 × 31) = 197 Hz
– When Prescale = 0x03 (minimum is 3), the LED output frequency is
(25 × 106) ÷ (4096 × 4) = 1526 Hz
– When Prescale = 0xFF (maximum is 255), the LED output frequency is
(25 × 106) ÷ (4096 × 256) = 24 Hz
Remark: The PRESCALE register value can only be set/update when the SLEEP bit
in the MODE1 register is set to logic 1 as shown in Figure 8. Apply external clock input
to EXTCLK pin, user must set the SLEEP bit in MODE1 register, then write logic 1 to both
the SLEEP and EXTCLK bits in MODE1 register to enable the external clock.
Fig 8.
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PRESCALE to adjust LED output frequency when sleep enabled
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9. Support
For support, send an E-mail to: [email protected]
10. Abbreviations
Table 2.
Abbreviations
Acronym
Description
ESD
ElectroStatic Discharge
GUI
Graphical User Interface
I2C-bus
Inter-Integrated Circuit bus
IC
Integrated Circuit
LED
Light-Emitting Diode
PC
Personal Computer
PWM
Pulse Width Modulator
RAM
Random Access Memory
RGB
Red/Green/Blue
RGBA
Red/Green/Blue/Amber
SMBus
System Management Bus
USB
Universal Serial Bus
11. References
UM10574
User manual
[1]
PCA9685, 16-channel, 12-bit PWM Fm+ I2C-bus 25 mA voltage switch LED
driver — Product data sheet; NXP Semiconductors;
www.nxp.com/documents/data_sheet/PCA9685.pdf
[2]
UM10206, “I2C Demonstration Board 2005-1 Quick Start Guide” —
NXP Semiconductors; www.nxp.com/documents/user_manual/UM10206.pdf
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12. Legal information
12.1 Definitions
Draft — The document is a draft version only. The content is still under
internal review and subject to formal approval, which may result in
modifications or additions. NXP Semiconductors does not give any
representations or warranties as to the accuracy or completeness of
information included herein and shall have no liability for the consequences of
use of such information.
12.2 Disclaimers
Limited warranty and liability — Information in this document is believed to
be accurate and reliable. However, NXP Semiconductors does not give any
representations or warranties, expressed or implied, as to the accuracy or
completeness of such information and shall have no liability for the
consequences of use of such information. NXP Semiconductors takes no
responsibility for the content in this document if provided by an information
source outside of NXP Semiconductors.
In no event shall NXP Semiconductors be liable for any indirect, incidental,
punitive, special or consequential damages (including - without limitation - lost
profits, lost savings, business interruption, costs related to the removal or
replacement of any products or rework charges) whether or not such
damages are based on tort (including negligence), warranty, breach of
contract or any other legal theory.
Notwithstanding any damages that customer might incur for any reason
whatsoever, NXP Semiconductors’ aggregate and cumulative liability towards
customer for the products described herein shall be limited in accordance
with the Terms and conditions of commercial sale of NXP Semiconductors.
Right to make changes — NXP Semiconductors reserves the right to make
changes to information published in this document, including without
limitation specifications and product descriptions, at any time and without
notice. This document supersedes and replaces all information supplied prior
to the publication hereof.
Suitability for use — NXP Semiconductors products are not designed,
authorized or warranted to be suitable for use in life support, life-critical or
safety-critical systems or equipment, nor in applications where failure or
malfunction of an NXP Semiconductors product can reasonably be expected
to result in personal injury, death or severe property or environmental
damage. NXP Semiconductors and its suppliers accept no liability for
inclusion and/or use of NXP Semiconductors products in such equipment or
applications and therefore such inclusion and/or use is at the customer’s own
risk.
design. It is customer’s sole responsibility to determine whether the NXP
Semiconductors product is suitable and fit for the customer’s applications and
products planned, as well as for the planned application and use of
customer’s third party customer(s). Customers should provide appropriate
design and operating safeguards to minimize the risks associated with their
applications and products.
NXP Semiconductors does not accept any liability related to any default,
damage, costs or problem which is based on any weakness or default in the
customer’s applications or products, or the application or use by customer’s
third party customer(s). Customer is responsible for doing all necessary
testing for the customer’s applications and products using NXP
Semiconductors products in order to avoid a default of the applications and
the products or of the application or use by customer’s third party
customer(s). NXP does not accept any liability in this respect.
Export control — This document as well as the item(s) described herein
may be subject to export control regulations. Export might require a prior
authorization from competent authorities.
Evaluation products — This product is provided on an “as is” and “with all
faults” basis for evaluation purposes only. NXP Semiconductors, its affiliates
and their suppliers expressly disclaim all warranties, whether express, implied
or statutory, including but not limited to the implied warranties of
non-infringement, merchantability and fitness for a particular purpose. The
entire risk as to the quality, or arising out of the use or performance, of this
product remains with customer.
In no event shall NXP Semiconductors, its affiliates or their suppliers be liable
to customer for any special, indirect, consequential, punitive or incidental
damages (including without limitation damages for loss of business, business
interruption, loss of use, loss of data or information, and the like) arising out
the use of or inability to use the product, whether or not based on tort
(including negligence), strict liability, breach of contract, breach of warranty or
any other theory, even if advised of the possibility of such damages.
Notwithstanding any damages that customer might incur for any reason
whatsoever (including without limitation, all damages referenced above and
all direct or general damages), the entire liability of NXP Semiconductors, its
affiliates and their suppliers and customer’s exclusive remedy for all of the
foregoing shall be limited to actual damages incurred by customer based on
reasonable reliance up to the greater of the amount actually paid by customer
for the product or five dollars (US$5.00). The foregoing limitations, exclusions
and disclaimers shall apply to the maximum extent permitted by applicable
law, even if any remedy fails of its essential purpose.
Translations — A non-English (translated) version of a document is for
reference only. The English version shall prevail in case of any discrepancy
between the translated and English versions.
Applications — Applications that are described herein for any of these
products are for illustrative purposes only. NXP Semiconductors makes no
representation or warranty that such applications will be suitable for the
specified use without further testing or modification.
12.3 Trademarks
Customers are responsible for the design and operation of their applications
and products using NXP Semiconductors products, and NXP Semiconductors
accepts no liability for any assistance with applications or customer product
I2C-bus — logo is a trademark of NXP Semiconductors N.V.
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are the property of their respective owners.
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13. Contents
1
2
3
3.1
3.2
3.3
3.4
4
4.1
4.2
4.3
5
6
7
8
8.1
8.2
9
10
11
12
12.1
12.2
12.3
13
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Assumptions . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Static handling requirements . . . . . . . . . . . . . . 3
Minimum system requirements. . . . . . . . . . . . . 3
Power requirements . . . . . . . . . . . . . . . . . . . . . 3
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
I2C demo board 2005-1 and WIN-I2CUSB Lite
software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
OM13332 connection to I2C demo board
2005-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
OM13332 connection to Win-I2CUSB
hardware adapter board . . . . . . . . . . . . . . . . . . 5
Hardware description . . . . . . . . . . . . . . . . . . . . 6
Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
OM13332 demonstration board main
components . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
PCA9685 evaluation steps . . . . . . . . . . . . . . . . 8
Dimming and brightness control for individual
LED. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Dimming and brightness control for all LEDs
and Prescale. . . . . . . . . . . . . . . . . . . . . . . . . . 11
Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . 12
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Legal information. . . . . . . . . . . . . . . . . . . . . . . 13
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Please be aware that important notices concerning this document and the product(s)
described herein, have been included in section ‘Legal information’.
© NXP Semiconductors N.V. 2014.
All rights reserved.
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: [email protected]
Date of release: 1 April 2014
Document identifier: UM10574