NXP Semiconductors PCA9633 User manual

UM10573
PCA9633 demo board OM6276
Rev. 1 — 17 October 2012 User manual
Document information
Info Content
Keywords LED driver, FET, I2C-bus
Abstract The PCA9633 OM6276 demo board demonstrates the NXP
Semiconductors PCA9633 Fast-mode Plus 4-bit I2C-bus LED driver IC

UM10573 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
User manual Rev. 1 — 17 October 2012 2 of 16
Contact information
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: [email protected]
NXP Semiconductors UM10573
PCA9633 demo board OM6276
Revision history
Rev Date Description
1 20121017 first issue

UM10573 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
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NXP Semiconductors UM10573
PCA9633 demo board OM6276
1. Introduction
The PCA9633 OM6276 demo board demonstrates the NXP Semiconductors PCA9633
Fast-mode Plus 4-bit I2C-bus LED driver IC. The PCA9633 controls four LEDs and
through individual pulse width modulation (PWM) each LED show different levels of
intensity.
The board supports six different modes of operation including color wash and random
color. The on-board Flash microcontroller is also user reprogrammable for endless
variations of functionality.
The board:
•Has 6 Different Modes of Operation:
–Auto Demonstration Mode
–Color Wash Mode
–Random Color Mode
–User Color Mode
–Multiple Card Chase Mode
–Output Enable Control Mode
•Includes high-current FET drivers for off board LED circuitry
•Can be powered by either the on-board 9 V (DC) battery or through the external
power connector
•Can be daisy-chained with additional boards for synchronous control by a single I2C
master
2. Description
Figure 1 is a photograph of the PCA9633 (Philips legacy) demo board showing the
PCA9633 chip (U2) and LPC925 microcontroller (U1) installed. Figure 3 shows a block
diagram of the demo board. Figure 4 shows the board power and mode switch.
The board can be powered by either the on-board 9 V (DC) battery on the underside of
the board (Figure 2), or by an external power supply. There are 4 software programmable
I2C addresses which allow the control of groups of devices with a single software
command sequence.
The board features:
•1 MHz and 30 mA output allows faster data updates and/or more capacitive buses
•4 individually controlled 25 mA open-drain or push-pull outputs OFF, ON, DIM, or DIM
with Global Control for LED dimming/blinking
•OE input pin also allows hardware dimming/blinking
•Up to 7 address pins allows 128 I2C addresses
•4 software programmable I2C addresses allows controlling groups of devices with
single software command sequence
•If the battery is low, the red LED will flash every 3 seconds as a warning.

UM10573 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
User manual Rev. 1 — 17 October 2012 4 of 16
NXP Semiconductors UM10573
PCA9633 demo board OM6276
Fig 1. Top view of PCA9633 OM6276 demo board
aaa-004224
Fig 2. Battery placement
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NXP Semiconductors UM10573
PCA9633 demo board OM6276
2.1 Power connectivity
The PCA9633 OM6276 demo board requires input power of 6 V (DC) to 9 V (DC) at
100 mA. This power may be supplied via the 9 V battery holder, or via the external power
connector, J2. Take care to observe correct polarity when connecting an external power
source to the board.
Fig 3. Block diagram OM6276
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UM10573 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
User manual Rev. 1 — 17 October 2012 6 of 16
NXP Semiconductors UM10573
PCA9633 demo board OM6276
2.2 Board power and mode DIP switch (SW1)
This DIP switch comprises 8 slider switches that connect board power, set slaved boards
and set cable functions.
2.3 DIP switch settings
[1] See Section 2.4.
2.3.1 Board power OFF/ON
Slider switch 8 of the DIP switch turns power OFF/ON for the board. Switch the board
power OFF whenever the board is not in use to avoid battery drain. Remove the battery
from the board when not in use, to avoid battery drain should the OFF/ON switch be
inadvertently switched ON. Place the battery in the holder with the contacts “away” from
each other as a storage method (Figure 2).
Fig 4. Board power and mode DIP switch
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Table 1. DIP switch settings
Slider
switch Function Switch position Description
1 board address 0 1<>0 [1] board address input to processor and PCA9633
2 board address 1 1<>0 [1] board address input to processor and PCA9633
3 board address 2 1<>0 [1] board address input to processor and PCA9633
4cableLEDOE N<>Y connect the OE of the PCA9633 to the cable
5 bus SDA pull-up enable N<>Y enable pull-up of the SDA signal on the cable
6 bus SCL pull-up enable N<>Y enable pull-up of the SCL signal on the cable
7 cable power OFF/ON OFF/ON connect the battery to the cable
8 board power OFF/ON OFF/ON board power control

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User manual Rev. 1 — 17 October 2012 7 of 16
NXP Semiconductors UM10573
PCA9633 demo board OM6276
2.3.2 Bus SDA pull-up enable and bus SCL pull-up enable
Slider switches 5 and 6 (see Table 1) disable/enable the cable side pull-ups for the
I2C-bus. These switches must be ON for the MASTER Board (0) and the LAST SLAVE
board in the chain. All other boards between, must have these switches set to OFF. If
there are only two boards connected (MASTER and SLAVE), both boards must have
these switches set to ON.
2.3.3 Cable power OFF/ON
Slider switch 7 enables the battery power connection to the RJ45 cable on pin 1 of the
RJ45 Ethernet socket. It allows a single power source for the complete chain of boards
when all the boards have this switch set to ON. When a chain of boards is utilized, use a
single bench or wall power supply and remove the 9 V battery from each board. This
action is necessary as the typical 9 V battery cannot supply enough current to power
multiple boards.
The input power requirements are: 6 V (DC) to 12 V (DC), 100 mA per board maximum.
2.4 Board selection
[1] Only one board can be set as Master.
[2] The MASTER board must be at one end of the Ethernet cable for proper operation of the I2C-bus.
Subsequent SLAVE boards are not required to be in any certain order. Also, there may be gaps in the
SLAVE board addresses (e.g., it is possible to have SLAVE Boards 2, 4, 6 and no SLAVE Board 3 or 5).
2.5 Off-board LED drivers
The PCA9633 OM6276 demo board includes four NXP Semiconductors BSH112
high-current FET drivers for off-board LED circuitry. These devices, Q1 to Q4, are capable
of switching up to 60 V at 300 mA. Their outputs are connected to solder pads L1 to L4
with adjacent 5 V and GND connections. They are connected as “low side” switches to
ground configuration.
3. Operation
On the DIP switch push slider switch 8 to the ON position. The LEDs will immediately flash
and glow. To select a different mode of operation, press the MODE button (PB1). The LED
will flash amber a number of times to denote which mode has been entered. Use the other
three buttons (SELECT, PLUS, MINUS) to change the settings. The six different available
modes of operation are described in Table 3.
Table 2. Board address
SW3 SW2 SW1 Board Description
ON ON ON 0 master (default)[1][2]
ON ON OFF 1 slave 1
ON OFF ON 2 slave 2
ON OFF OFF 3 slave 3
OFF ON ON 4 slave 4
OFF ON OFF 5 slave 5
OFF OFF ON 6 slave 6
OFF OFF OFF 7 slave 7

UM10573 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
User manual Rev. 1 — 17 October 2012 8 of 16
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PCA9633 demo board OM6276
If the battery is low, the red LED will flash every three seconds.
Table 3. Modes
Switch selection Action
Mode 1: Auto demonstration First shows Mode 2 for 10 seconds, then shows Mode 3 for
10 seconds, and then repeats
Mode next mode
Select does nothing
Plus does nothing
Minus does nothing
Mode 2: Color wash Goes through blends of different colors continuous
Mode next mode
Select toggle between smooth transitions and sharp transitions
Plus does nothing
Minus does nothing
Mode 3: Random color Randomly shows different colors without blending
transitions
Mode next mode
Select toggle between two color sets: darker and lighter
Plus faster
Minus slower
Mode 4: User color Allows a color to be chosen by selecting the amount of
each LED’s PWM output. It also selects the fifth group
PWM that is used to dim or blink the combined colors at
the same time
Mode next mode
Select select color PWM component: red, green, blue, amber or
white; fifth group PWM flashes as that PWM is selected
Plus more of that color component
Minus less of that color component
Mode 5: Multiple card chase Uses multiple cards and the group call feature of the
PCA9633 to generate a chase pattern of 2 (yellow/red), 3
(yellow/red/green), or 4 (yellow/red/green/blue) colors. It
can be done for up to 8 boards (master plus seven slave
boards) connected via the RJ45 Ethernet sockets.
Mode next mode
Select select color PWM component: red, green, blue, amber or
white; fifth group PWM flashes as that PWM is selected
Plus more of that color component
Minus less of that color component
Mode 6: Output Enable control Demonstrates the OE control pin input that sets the LED
outputs to high impedance. This mode changes the LED
diffuser color to purple and blinks all LEDs at the same
rate.
Mode next mode

UM10573 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
User manual Rev. 1 — 17 October 2012 9 of 16
NXP Semiconductors UM10573
PCA9633 demo board OM6276
Select selects frequency (duty cycle fixed at 50 %/50 %) or duty cycle
(frequency fixed at XX)
Plus faster frequency (double each push) or longer ON duty cycle
Minus slower frequency (halves each push) or shorter ON duty cycle
Table 3. Modes
Switch selection Action

UM10573 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
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PCA9633 demo board OM6276
4. Application information
4.1 Schematics
Fig 5. Microprocessor
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