NXP Semiconductors PCA9634 User manual

UM10537
PCA9634 demonstration board OM13327
Rev. 1 — 7 March 2012 User manual
Document information
Info Content
Keywords I2C, PCA9634, RGB, RGBA, 8 x 8-bit PWM
Abstract The OM13327 is an add-on to the NXP I2C 2005-1 demo board. This
daughter board makes it easy to test and design with the PCA9634, an
8-bit Fast-mode Plus (Fm+) low power LED driver. These boards, along
with the I2CUSB Lite GUI (PC-based), provide an easy to use evaluation
platform.
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User manual Rev. 1 — 7 March 2012 2 of 13
Contact information
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: [email protected]
NXP Semiconductors UM10537
PCA9634 demonstration board OM13327
Revision history
Rev Date Description
v.1 20120307 user manual; initial release
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PCA9634 demonstration board OM13327
1. Introduction
The PCA9634 evaluation board features LEDs for color mixing, blinking and dimming
demonstrations. A graphical interface allows the user to easily explore the different
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 platform.
2. Features
•A complete evaluation platform for the PCA9634 8-bit low power LED driver
•Easy to use GUI based software demonstrates the capabilities of the PCA9634
•On-board RGBA 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 2005-1 demonstration board (OM6275)
3.4 Power requirements
The NXP demonstration board I2C 2005-1 and OM13327 hardware obtain power from the
PC USB port. Care should be taken not to 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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PCA9634 demonstration board OM13327
4. Installation
4.1 I2C 2005-1 board and WIN-I2CUSB Lite software
The OM13327 is a daughter card to the OM6275 I2C 2005-1 demo board. You may
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/.
4.2 OM13327 connection to I2C 2005-1 board
The I2C 2005-1 demo board should be disconnected from your PC before mounting the
OM13327 board on to it. The OM13327 board has a 9-pin female connector that connects
to the JP1 male connector on the I2C 2005-1 board.
With both boards facing you, connect the OM13327 board to the I2C 2005-1 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 PCA9634.
Fig 1. PCA9634 demo board (OM13327) mounting to the I2C 2005-1 demo board
019aac698
PCA9634 demo board
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PCA9634 demonstration board OM13327
5. Hardware description
The OM13327 board has following jumper headers:
•J2 is for connection to JP1 on I2C 2005-1 demo board.
•J6 allows monitoring all 8 LED output signals.
•J3 is for pass-through signals from the I2C 2005-1 demo board to connect in series
with other I2C-bus demo boards.
•J1 is used for power supply selection, connected 1-2 for VDD = 5 V and connected 2-3
for VDD =3.3V.
•J4 and J5 for internal 1.1 kΩpull-up resistors option on SDA and SCL signals.
•J7 allows monitoring and control output enable (OE) input signal.
•SW1 8-position DIP switch to select I2C-bus address A[0:6] = SW1[1:7] for this device
and set output enable OE = SW1[8].
Fig 2. PCA9634BS demo board (OM13327)
019aac699
SW1 for A[0:6] and OE
control setting
J7 OE test pin
PCA9634BS
J3 9-pin extender
connector
J1 select VDD
1-2 (5 V), 2-3 (3.3 V)
RGBA LEDs
light diffuser
J6 LED output
test points
J2 9-pin connector
to I2C 2005-1 board
J4/J5 internal 1.1 kΩ pull-up
jumpers for SDA/SCL
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PCA9634 demonstration board OM13327
6. Schematic
Fig 3. PCA9634 daughter card
019aac700
1 2 3 4 5 6 7 8 9
J2 CON9-female
5 V unswitched
5 V switched
3.3 V unswitched
3.3 V switched
SCL SDA GND IO1 IO2
R4
1.2 kΩ
R5
1.2 kΩ
R6
1.2 kΩ
R3
150 Ω
1
4
3
OVSARGB3R8
LTST-C170AKT
1 2 3 4 5 6 7 8 9
J3
CON9-male
2
LED1
LED2
C1
10 μF
C2 0.1 μF
12
JUMPER J4 R1
1.1 kΩ
1
2
3
4
HEADER 1 × 8
J6
15 14 13 12 11
A5 /OE LED6 LED7 A6
A5
/OE
LED6 LED7
A6
20
19
18
17
16
A0
SCL
SDA
A1
A0
VDD
SCL
SDA
A1
1 2 3 4 5
A3 A4
LED1 LED0
A2
A3 A4 LED1 LED0 A2
6
7
8
9
10
LED3 LED5
LED4
LED2
LED3
VSS
LED5
LED4
LED2
C3
0.1 μF
PCA9634 VDD
12
R2
1.1 kΩ
JUMPER J5
U1
PCA9634BS
1
3
2
5 V 3.3 V
JUMPER J1
1-2 VDD/LED = 5 V 2-3 VDD/LED = 3.3 V
R8
1.2 kΩ
R9
1.2 kΩ
R10
1.2 kΩ
R7
150 Ω
1
4
3
OVSARGB3R8
LTST-C170AKT
2
LED3
LED4
3.3 V switched
SCL
GND
SDA
IO1 IO2
R12
R11
R13
R14
R15
R16
R17
R18
10 kΩ
10 kΩ
10 kΩ
10 kΩ
10 kΩ
10 kΩ
10 kΩ
10 kΩ
SW1 SW DIP-8
/OE
A6 A5 A4 A3 A2 A1 A0
1
HEADER 1
J7
/OE test pin
LED[0:7] test pins
5
6
7
8
LED0
LED1
LED2
LED3
LED4
LED5
LED6
LED7
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PCA9634 demonstration board OM13327
7. OM13327 demonstration board main components
8. PCA9634 evaluation steps
The PCA9634 functions are controlled by WIN-I2CUSB Lite GUI. Refer to the PCA9634
data sheet for additional information on the registers and functionality.
8.1 Color mixing and dimming LEDs
1. Connect the hardware as described in Section 4. The PCA9634 address is set to
0xC4 on SW1 as A[0:6] = SW1[1:7] = 0100011 (0 →ON, 1 →OFF).
2. Start the GUI software.
3. The main screen will appear.
4. From the ‘Device’ drop-down menus select ‘LED Blinkers and Dimmers’, and from the
subsequent drop-down menu select ‘PCA9634 8-bit LED driver with 8-bit PWM’ as in
Figure 4.
5. The device configuration screen will be displayed as in Figure 5.
6. Un-check the ‘Sleep Enabled (oscillator off)’ box to enable the device, check the
‘Auto Write’ box (lower right), and click the ‘Write All’ button.
7. Go to the LED Driver Outputs (LEDOUT) pull-down tabs and for LED0 to LED7 select
‘LEDn controlled by PWMn and GRPPWM’.
8. With the cursor, move the PWMn bars in PWM Registers to change the colors on the
OM13327 board.
PWM0 controls the blue LED2.
PWM1 controls the green LED2.
PWM2 controls the red LED2.
PWM3 controls the amber LED1.
PWM4 controls the blue LED4.
PWM5 controls the green LED4.
PWM6 controls the red LED4.
PWM7 controls the amber LED3.
9. Once you set a color with the PWM values, move the GRPPWM bar in Group
Registers and observe the dimming effect as in Figure 6.
Table 1. OM13269 demo board main components
Device Description Address Location
PCA9634BS 8-bit Fm+ I2C-bus low power
LED driver 0xC4 for I2C 2005-1 interface U1
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User manual Rev. 1 — 7 March 2012 8 of 13
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PCA9634 demonstration board OM13327
Fig 4. Drop-down menu selections
Fig 5. Device configuration screen
019aac701
019aac702
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UM10537 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
User manual Rev. 1 — 7 March 2012 9 of 13
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PCA9634 demonstration board OM13327
Fig 6. Dimming effect
019aac703
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User manual Rev. 1 — 7 March 2012 10 of 13
NXP Semiconductors UM10537
PCA9634 demonstration board OM13327
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, check the ‘Group Control’ box to change the
mode to blinking.
2. With the cursor, move the PWMn bars in PWM Registers to select a color.
3. To set a blink cycle, use the GRPPWM bar to select the duty cycle and use the
GRPFREQ bar to select the blink frequency in Group Registers.
4. For example, set the GRPPWM to 0xE7 (90.23 % duty cycle) and the GRPFREQ to
0x2F (2 second) for a short blink every two seconds (see Figure 7).
5. Change the GRPPWM to 0x80 (50 % duty cycle) and the LED will be on for
one second, repeating every two seconds.
6. Change the color of the LEDs by selecting a different PWM value for each LED.
7. Set the GRPPWM to 0x52 (32 % duty cycle) and the GRPFREQ to 0x01
(0.08 second) and observe the pattern.
8. Change the PWMn values, GRPPWM and GRPFREQ values to create different blink
patterns.
9. Change the LEDOUT register on one LED output to be controlled only by its PWM, for
example, ‘LED1 controlled by PWM1’ and ‘LED6 controlled by PWM6’.
10. Change the blink rate and observe the results (blinking with two different colors on
each LED).
Fig 7. Example of short blink every two seconds
019aac704
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