NXP Semiconductors PCA9633, User Manual, Page: 3 / 16

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 3 of 16
NXP Semiconductors
UM10573
PCA9633 demo board OM6276
1. Introduction
The PCA9633 OM6276 demo board demonstrates the NXP Semiconductors PCA9633
Fast-mode Plus 4-bit I
2
C-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 I
2
C
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
I
2
C 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 I
2
C addresses
•
4 software programmable I
2
C 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.