UM10572
PCA9955 demonstration board OM13330
Rev. 1 — 7 June 2012 User manual
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Keywords Fm+ I2C-bus, PCA9955, RGB and white LEDs, 16-channel × 8-bit PWMs
Abstract The OM13330 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 PCA9955, a 16-channe l Fast-mode Plus
(Fm+) 57 mA constant current and outputs allow up to 40 V for LED
supply. These boards, along with the Win-I2CUSB Lite GUI (PC based),
provide an easy to use evaluation platform.
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Contact information
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: salesaddresses@nxp.com
NXP Semiconductors UM10572
PCA9955 demonstration board OM13330
Revision history
Rev Date Description
v.1 20120607 user manual; initial release
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PCA9955 demonstration board OM13330
1. Introduction
The PCA9955 evaluation board features LEDs for color mixing, blinking and dimming
demonstrations. A graphica l interface allows the easy explor ation of the dif ferent functions
of the driver. The board can be connected in series with other I2C-bus 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 pl atform.
2. Features
•A complete evaluation platform for the PCA9955 16-channel Fm+ I2C-bus constant
current LED driver
•Easy to us e GUI-based software demonstrates the capabilities of the PCA9955
•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
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.nxp.com/redirect/demoboard.com)
3.4 Power requirements
The NXP demonstration b oard I2C 2005-1 and OM133 30 hardware obtain power from the
PC USB port. Take care to not exceed the USB port current capabilities.
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.
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PCA9955 demonstration board OM13330
4. Installation
4.1 I2C demo board 2005-1 and WIN-I2CUSB Lite software
The OM13330 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 ics.nxp.com/support/boards/i2c20051/.
The Win-I2CUSB Lite software from The Boardshop runs o n 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 pr ovides a Universal mode (I 2C Expert mode)
to allow users to create their own I2C-bus commands with the same I2C-bus devices.
4.2 OM13330 connection to I2C demo board 2005-1
The I2C demo board 2005-1 should be disconnected from your PC before mounting the
OM13330 board on to it. The OM13330 board has a 9-pin female connector (J4) 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 right-hand side as shown in the
Figure 1, connect the OM13330 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 PCA9955.
Fig 1. PCA9955 demo board (OM13330) mounting to the I2C demo board 2005-1 (OM6275)
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PCA9955 demonstration board OM13330
4.3 OM13330 connection to Win-I2CUSB hardware adapter board
The Win-I2CUSB board should be disconnected from your PC before connecting the
OM13330 board on to it. The OM13330 board has a 14-pin male connector (J2) that
connects to the 14-pin male connector (J1) on the Win-I2CUSB board as shown in
Figure 2.
Connect the OM13330 board to the Win-I2CUSB boar d 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 PCA9955.
Fig 2. PCA9955 demo board (OM13330) connecting to the Win-I2CUSB board
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PCA9955 demonstration board OM13330
5. Hardware description
Figure 3 shows the following items on the hardwar e:
•J4 (9-pin) is for connection to JP1 on I2C demo board 2005-1.
•J3 and J5 (5-pin) are for connection to PCA9665/PCU9669 mini boards and cascade
the second PCA9955 demo board.
•J1 selects VDD power for PCA9 955, connected 1-2 for VDD = 3.3 V and connected 2-3
for VDD = 5 V.
•SW1 4-position DIP switch to select I2C-bus address A[0:3] = SW1[1:4] for this device
(default is 0xC0, all switches are ON position).
•J2 (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).
•J6, J7 and J8 are GND pins for probing use.
Fig 3. PCA9955 demo board (OM13330)
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PCA9955 demonstration board OM13330
6. Schematic
Fig 4. PCA99 5 5 de mo bo ard sch e ma ti c
019aac728
1
2
3
4
5
A0
A1
A3
A2
A0
A1
A3/OE
A2
REXT
PCA9952TW, PCA9955TW, PCU9955TW
6
7
8
9
LED0
LED1
LED3
LED2
LED0
LED1
LED3
LED2
10
11
12
GND
LED5
LED4 VSS
LED5
LED4
13
14
LED6
LED7 LED6
LED7
U1
28
27
26
25
24 GND
RESET
SDA/USDA
SCL/USCL
VSS
RESET
VDD
23
22
21
20
LED15
LED14
LED12
LED13
LED15
LED14
LED12
LED13
19
18
17
GND
LED10
LED11
VSS
LED10
LED11
16
15
LED9
LED8
LED9
LED8
R10
R11
0 Ω
0 Ω
R9
2.8 kΩ
(ISET max = 20.4 mA)
SW1
SW DIP-4/SM
R1 10 kΩ
R2 10 kΩ
R3 10 kΩ
R4 10 kΩ
VDD_IN
(output enable
for PCA9952)
TP1 1
R5 100 Ω
R6 100 Ω
R13 100 Ω
R14 100 Ω
SDA_USDA filter
SCL_USCL filter
do not populate
R7
10 kΩ
1
2
3
J1
+3.3 V +5 V
VDD_IN
R8
10 Ω
C2
0.1 μF
C3
4.7 μF
U
varistor 8 V
RV1
R12
1 kΩ
D1
LTST-C170KGKT
1
2
3
+24 V
SDA_USDA_1
+5 V
4
5
SCL_USCL_1
GND
J3
C1
10 μF
CONN TRBLK-5
5-pin connector to/from PCU9669 UFm
I2C master board to drive PCU9955 or
to/from another I2C slave PCA/PCU9955
demo board
1
2
3
+5 V
+3.3 V
4
5
SCL_USCL_1
J4
C6
10 μF
CON9-female
6
7
SDA_USDA_1
GND
8
9RESET
C7
10 μF
9-pin connector to/from I2C 2005-1
demo board for PCA9952/PCA9955
3
2
1
J6
1GND
2I/O1
4
VCC
3
I/O2
U2
close to 5-pin connector J3
PRTR5V0U2AX
C25
0.01 μF
+5 V
L1
BLM18BD471SN1
SDA_USDA_1 SDA_USDA-filter
L2
BLM18BD471SN1
SCL_USCL_1 SCL_USCL-filter
(470 Ω at 100 MHz)
3
2
1
J8
1GND
2I/O1
4
VCC
3
I/O2
U3
close to 5-pin connector J5
PRTR5V0U2AX
C26
0.01 μF
+5 V
L3
BLM18BD471SN1
SDA_USDA_2 SDA_USDA-filter
L4
BLM18BD471SN1
SCL_USCL_2 SCL_USCL-filter
(470 Ω at 100 MHz)
C9
0.1 nF
C10
0.1 nF
C11
0.1 nF
C12
0.1 nF
C13
0.1 nF
C14
0.1 nF
C15
0.1 nF
C16
0.1 nF
C17
0.1 nF
C18
0.1 nF
C19
0.1 nF
C20
0.1 nF
C21
0.1 nF
C22
0.1 nF
C23
0.1 nF
C24
0.1 nF
D2
LED0
LW-E67C-white
+5 V
A1
C2
A2
C1
C3
A3
D3 LED[1:3]
LRTB_G6SG
D4
LED4
LW-E67C-white
R15 0 Ω
R16 0 Ω
R17 0 Ω
R18 0 Ω
LED0
LED1
LED2
LED3
R19 0 Ω
R20 0 Ω
R21 0 Ω
LED4
LED5
LED6
R22 0 Ω
R23 0 Ω
R24 0 Ω
LED7
LED8
LED9
R25 0 Ω
R26 0 Ω
R27 0 Ω
LED10
LED11
LED12
R28 0 Ω
R29 0 Ω
R30 0 Ω
LED13
LED14
LED15
A1
C2
A2
C1
C3
A3
D5 LED[5:7]
LRTB_G6SG
D6
LED8
LW-E67C-white
A1
C2
A2
C1
C3
A3
D7 LED[9:11]
LRTB_G6SG
D9
LED12
LW-E67C-white
A1
C2
A2
C1
C3
A3
D8 LED[13:15]
LRTB_G6SG
3
2
1
J7
GND
GND
GND
1
2
3
+24 V
SDA_USDA_2
+5 V
4
5
SCL_USCL_2
GND
J5
C8
10 μF
CONN TRBLK-5
5-pin connector to/from PCU9669 UFm
I2C master board to drive PCU9955 or
to/from another I2C slave PCA/PCU9955
demo board
1
3
5
7
9
11
13
2
4SCL_USCL_2
(VP) VDO_IN
6
8
10
GND
SDA_USDA_2
12
14 +5 V
J2
GND
+3.3 V
C4
10 μF
VP supplies the
power to the I2C
pull-up resistors
on WIN-I2CUSB
C5
10 μF
14-pin connector to/from
WIN-I2CUSB Fm+ I2C master
to drive PCA9952/PCA9955
HEADER 7x2/SM
I2CUSB CONNECTOR
AVR-M1608C080M
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PCA9955 demonstration board OM13330
7. OM13330 demonstration board main components
8. PCA9955 evaluation steps
The PCA9955 functions are controlled by WIN-I2CUSB Lite GUI. Refer to the PCA9955
data sheet for additional information on the registers and functio nality.
Connect the hardware as described in Section 4. The PCA9955 demo board address is
set to 0xC0 on SW1 as A[0:3] = SW1[1:4] = 0000 (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 the 3.3 V or 5.0 V symbols on the bottom of the window. Power supplies
are disabled by default, and must be enabled before using the I2C-bus devices on the
board. I2C-bus fre quency is controlled through the ‘Options’ menu or by double-clicking on
the frequency symbol on the bottom of the window.
8.1 Color mixing and dimming LEDs
1. From the ‘Device’ drop-down menus, select ‘LED Blinkers and Dimmers’, and from
the subsequent drop-down menu select ‘PCA9955 16-channel Const ant Current LED
Driver’ as shown in Figure 5.
2. 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).
3. The device configuration screen is displayed by clicking the following options:
–‘PWM 0 to 7’ individual brightness control for LED0 to LED7 as shown in Figure 6.
–‘PWM 8 to 15’ individual brightness control for LED8 to LED15 as shown in
Figure 7.
–‘LEDOUT’ LED driver ou tp ut state for LED0 to LED1 5 as sh ow n in Figure 8.
–‘Output Gain’ LED output current setting for LED0 to LED15 as shown in Figure 9.
Table 1. OM13330 demo board main co mponents
Device Description Address/LED output Location
PCA9955TW 16-channel Fm+ I2C-bus 57 mA
constant current LED driver 0xC0 for I2C demo board 2005-1
interface U1
LW-E67C White LED LED0, LED4, LED8, LED12 D2, D4, D6, D9
LRTB_ G 6SG RGB LED LED1, LED2, LED3 D3
LRTB_ G 6SG 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 PCA9955 power supply
either 3.3 V or 5 V indicator -D1
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–‘Other’ GRPPWM is group PWM for global brightness control, GRPFREQ is group
frequency for global blinking control when group control = blinking in Mode 2
register , PWMALL is brightness control for all LED outputs, OFFSET is con trol LED
output delay offset, IREFALL is control output current for all LEDs as shown in
Figure 10.
4. Click the ‘LEDOUT’ configuration screen and select ‘PWMn & GRPPWM’ for LED[1:3]
(see Figure 8).
5. Click the ‘Output Gain’ configuration screen and adjust the IREF[1:3] = 0x30 for
LED[1:3] output current at 3.8 mA = 48 ×80 μA (see Figure 9).
6. Click the ‘PWM 0 to 7’ configuration screen and move the PWM1 (red) PWM2 (green)
PMW3 (blue) bars for color mixing (see Figure 6).
7. Once you set a color on D3 RGB LED with the PWM[1:3] values, click the ‘Other’
configuration screen and move the GRPPWM bar for dimming effect (see Figure 10).
Fig 5. Drop-do wn menu sel ecti ons
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Fig 6. De vice configuration screen for PWM[0 :7]
Fig 7. De vice configuration screen for PWM[8 :15 ]
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Fig 8. Device co nfi gu rat i on s creen for LEDOUT
Fig 9. Devi ce co nfi gu rat i on s creen for LED output current setti ng
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Fig 10. Device configur ation screen for ‘Other’ (Group and All registers)
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8.2 Color mixing and blinking LEDs
To set up a blinking demo, repeat step 1 through step 7 as in Section 8.1, then do the
following:
1. In the Mode 2 (= 0x25) selection window (middle left), check the
‘Group control = dimming’ box to change the mode to ‘Group control = blinking’.
2. To set a blink cycle, click the ‘Other’ configuration screen and move the GRPFREQ
bar to select blinking frequency as well as the GRPPWM bar to select the duty cycle
(see Figure 11).
3. For example, set the GRPPWM to 0x52 (32 % duty cycle) and the GRPFREQ to 0x0B
(0.5 second) for a one-third duty cycle and blink every half second on D3 RGB LED.
4. Change the PWM[1:3] values, GRPPWM and GRPFREQ values to create different
blink patterns and colors.
9. Support
For support, send an E-mail to: i2c.support@nxp.com
Fig 11. Example of short blink every half second
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10. Abbreviations
11. References
[1] PCA9955, 16-channel Fm+ I2C-bus 57 mA constant current LED driver —
Product data sheet; NXP Semiconductors;
www.nxp.com/documents/data_sheet/PCA9952_PCA9955.pdf
[2] UM10206, “I2C Demonstration Board 200 5-1 Quick Start Guide” —
NXP Semiconductors; www.nxp.com/documents/user_manual/UM10206.pdf
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
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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 liab ility for the consequences of
use of such information.
12.2 Disclaimers
Limited warr a nty 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 Se miconductors takes no
responsibility for the content in this document if provided by an inf ormation
source outside of NXP Semiconductors.
In no event shall NXP Semiconductors be liable for any indirect , incidental,
punitive, special or consequ ential damages (including - wit hout limitatio n - 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 Semiconduct ors’ aggregate and cumulati ve liability toward s
customer for the products described herein shall be limited in accordance
with the Terms and conditions of commercial sale of NXP Semicondu ctors.
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 informa tion supplied prior
to the publication hereof .
Suitability for use — NXP Semiconductors products are not designed,
authorized or warranted to be suit able 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 prod ucts in such equipment or
applications and theref ore such inclusi on and/o r use is at the cu stome r’s own
risk.
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 modificat i on.
Customers are responsible for the design and operation of their applications
and products using NXP Semiconductors pr oducts, and NXP Semiconductors
accepts no liability for any assistance with applications or customer product
design. It is customer’s sole responsibility to determine whether the NXP
Semiconductors product is suit able and fit for the custome r’s applications and
products planned, as well as fo r 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 t heir
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 th e 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 regulatio ns. 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 eval uation purposes only. NXP Semiconductors, its affiliates
and their supplie rs expressly disclaim all warrant ies, whether express, impl ied
or statutory, including but not limited to the implied warranties of
non-infringement, mercha ntability 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, it s aff iliates or thei r suppliers be liable
to customer for any special, indirect, consequ ential, punitive or incidental
damages (including without li mit ation d amages for l oss of bu siness, bu siness
interruption, loss of use , loss of data or information, and the like) arising out
the use of or inability to use the product, whet her or not based on tort
(including negligence), st rict liability, breach of contract, breach of warrant y 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 base d on
reasonable reliance up to the greater of the amount actually paid by customer
for the product o r five dollars (U S$5.00). The for egoing limita tions, exclusions
and disclaimers shall apply to the maximum extent permitt ed 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.
12.3 Trademarks
Notice: All referenced b rands, produc t names, service names and trademarks
are the property of their respect i ve ow ners.
I2C-bus — logo is a trademark of NXP B.V.
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© NXP B.V. 2012. All rights reserved.
For more information, please visit: http://www.nxp.co m
For sales office addresses, please send an email to: salesaddresses@nxp.com
Date of release: 7 June 2012
Document identifier: UM10572
Please be aware that important notices concerning this document and the product(s)
described herein, have been included in section ‘Legal information’.
13. Contents
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3 Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3.1 Assumptions. . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3.2 Static handling requirements . . . . . . . . . . . . . . 3
3.3 Minimum system requirements. . . . . . . . . . . . . 3
3.4 Power requirements . . . . . . . . . . . . . . . . . . . . . 3
4 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4.1 I2C demo board 2005-1 and WIN-I2CUSB Lite
software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4.2 OM13330 conne ction to
I2C demo board 2005-1 . . . . . . . . . . . . . . . . . . 4
4.3 OM13330 connection to Win-I2CUSB
hardware adapter board. . . . . . . . . . . . . . . . . . 5
5 Hardware description . . . . . . . . . . . . . . . . . . . . 6
6 Schematic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
7 OM13330 demonstration board main
components . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
8 PCA9955 evaluation steps . . . . . . . . . . . . . . . . 8
8.1 Color mixing and dimming LEDs . . . . . . . . . . . 8
8.2 Color mixing and blinking LEDs . . . . . . . . . . . 13
9 Support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
10 Abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . . 14
11 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
12 Legal information. . . . . . . . . . . . . . . . . . . . . . . 15
12.1 Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
12.2 Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . 15
12.3 Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 15
13 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
