4
Hardware Detail
The J822 Development Kit hardware is extremely simple and is intended to illustrate the ease of use of
the Color Management Controller. The development board features the following hardware elements:
COLOR MANAGEMENT CONTROLLER AND SYSTEM CONTROLLER
The board is incorporated with two processors, one is the HDJD-J822 color management controller and
the other is the Microchip PIC18F252 system controller.
DISPLAY
Eight Side-Emitting RGB Light Emitting Diodes (LED) are connected to emit colored light to a 3.5 inch
lightguide. This lightguide has micro-dot printed on the bottom side which lights up the whole lightguide,
causing it to glow in color (depending on what color setting is input to the color management controller.
One green LED is provided to determine whether there is power to the development board (LED on) or
not (LED off).
POWER SUPPLY
The development board has a switching regulator that will step-down the 12V input to p5V
supply needed to power up all the components onboard plus driving the eight LEDs. An external 12V,
1000mA or more unregulated DC supply can be plugged into J1.
Note: The J822 Development Kit does not include a power supply.
PARALLEL PORT
A parallel port interface is provided for easy interfacing with an IBM-PC computer. The port is used to
emulate I
2
C communication using software to perform the communication translation job. Since no
special hardware is needed on the parallel port side, hence normal 25-way to 25-way parallel port cable
can be used to hook up the board with the computer.
On the IBM-PC computer side, the BIOS
->
Onboard Peripheral
->
Parallel Port setting must be set to
Output-Only or Standard mode, before you can run the demonstration PC software (included in the
CD-ROM).
LED DRIVER
LX1991 LED drivers (U5-U10), from Microsemi, are included on the board to illustrate a typical LED
driving method. User can choose to use their own LED driver circuit to drive their LEDs through the use
PWM output pins on the external input-output connector.
The data sheet of this LX1991 LED driver is included in the CD-ROM for user reference.
