Linear Technology 824 Quick Start Manual page 4

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 824
colors that can be produced by the Nichia
NSCM315C RGB diode.
UPDATE ALL REG Button – When this button
is selected, all seven of the LTC3208 registers
are updated to the present settings on the demo
control window. This is beneficial when power is
initially applied to the demo board, the ribbon
cable has been disconnected, or when the
RESET push button has been depressed.
CAM FLASH Select Option Buttons – These
buttons allow the user to select the method in
which the CAM display is flashed. When the
CAMHL PIN option button is selected, the CAM
display is flashed by applying a pulse on the
CAMHL Pin. If the I2C option button is selected,
the CAM display is flashed by momentarily set-
ting the S bit in the G register via the I
CAMHILO
bus.
CAMHL FLASH Button – When this button is
selected and released, the CAM LEDs will flash
at the intensity selected in the CAMH register for
a period selected in the FLASH TIME drop-down
window. This is accomplished by applying a
pulse on the CAMHL pin or by setting the S
bit in the G register via the I
FLASH TIME Drop-Down Window – This win-
dow allows the user to select a flash time from
50ms to 200ms in 50ms increments. The flash
time is the time the program selects the CAMH
register when the CAMHL FLASH button is se-
lected.
Enable RGB AUX4 Dropout Check Box –
When this box is selected, the RGB and AUX4
dropout signals are enabled. When it is dese-
lected, the RGB and AUX4 dropout signals are
disabled and these outputs may then be used as
open drain logic signals.
Demo Buttons – These buttons can be selected
to run 2 different demonstrations. Demo 1 cy-
cles through the RGB colors. Demo 2 cycles
through the brightness levels of all the LEDs and
flashes between various CAMH and CAML in-
2
tensities using the I C serial port.
2
C
CAMHILO
2
C interface.
MULTIDISPLAY LED CONTROLLER
LEDS OFF Button – This button will turn off all
the LEDs and will turn off and reset any active
demo.
Force Charge Pump Option Buttons – These
buttons allow the user to select between auto
switching, forced 1.5X, or forced 2X Charge
Pump modes.
ENRGBS Option Buttons – If RGB Control is
selected, the RGB display will be disabled until
the ENRGBS push button on the DC824A board
is depressed. If the SUB Control is selected, the
SUB panel will be disabled until the ENRGBS
push button on the DC824A board is depressed.
AUX1 - AUX4 Option Buttons – These buttons
allow the user to configure each of the AUX
LEDs to the MAIN, SUB, CAM or AUX displays.
The intensity of each LED will be controlled by
the corresponding register and slide control se-
lected. If the MAIN button is selected, the corre-
sponding LED will change illumination with the
MAIN brightness control.
REGA – REGG Hex Display Boxes – These
boxes display the hex value last written to the
corresponding register from the DC590A board.
ENRGBS Push Button – This button is located
on the DC824A board and enables either the
RGB display or the SUB display when de-
pressed, depending on which ENGRBS option
button is selected on the demo control window.
RESET Push Button – This button is located on
the DC824A board and clears the seven regis-
ters in the LTC3208 when depressed. The reset
button will not update or change the demo con-
trol window. The UPDATE ALL REG button may
be used to update the registers to the current
demo control window settings.
4