Linear Technology DC1055A Quick Start Manual page 4

LTC3219
when the GRADATE UP, GRADATE DOWN, START
GRADATION WITH ENU or DEMO 1 button is selected. If
the DISABLED option button is selected, the universal
LEDs will not gradate when any of the GRADATION con-
trol buttons are selected.
GRADATE UP button gradates the selected LEDs up to
the set intensity at the selected gradation time. Gradation
is disabled when done. The ULED check box is high-
lighted purple to indicate that gradation mode has been
enabled.
GRADATE DOWN button gradates the selected LEDs
down from the set intensity at the selected gradation
time. Gradation is disabled when done. The ULED check
box is highlighted purple to indicate that gradation mode
has been enabled.
START GRADATION WITH ENU button gradates the se-
lected LEDs up to the set intensity when the ENU pin is
high (SET ENU PIN HI button is selected) and down
when the ENU pin is low. If this button is selected while
in gradation with ENU mode and with the ENU PIN high,
gradation and ENU control will be relinquished with the
LEDs set. If this button is selected while in gradation with
ENU mode and with the ENU PIN low, gradation and ENU
control will be relinquished with the LEDs off. During
gradation with ENU control, all other ULEDs must remain
off and the charge pump must remain in Auto mode (not
forced to any mode). The ULED check box is highlighted
purple to indicate that gradation mode has been enabled.
NOTE. The gradation time must be set to something other than
DISABLED to gradate the LEDs.
BLINK ONt/PERIOD option buttons set the desired blink-
ing on-time and period to blink after the BLINK ULEDs
button has been selected.
4
BLINK ULEDs button blinks or stop blinking the selected
LEDs at the on-time and period selected by the BLINK
ONt/PERIOD option buttons and at the selected LED in-
tensity. The ULED check box is highlighted green to indi-
cate that blink mode has been enabled.
CHARGE PUMP MODE option buttons allow the user to
select between Auto (not forced to any mode), Force 1x,
Force 1.5x, and Force 2x charge pump modes.
GPO MODE button disables or enables dropout for the
selected LEDs. When dropout is disabled the LEDs will
not cause the charge pump to switch into 1.5x or 2x
modes and the pin may be used as a general-purpose
output (GPO mode). The ULED check box is highlighted
orange to indicate that GPO MODE has been selected.
UPDATE ALL REG button updates the data registers to
the data displayed in the register text boxes.
LEDs OFF button turns off and resets all LEDs and LED
modes, plus stops and resets all demos.
DEMO 1-Rainbow button may be selected to start or
stop DEMO 1. This demo cycles through the different
colors that the two RGB LEDs can produce using the
LTC3219's gradation feature. The default gradation time
for this demo is 0.96s, however the 0.48s or 0.24s gra-
dation times may be used by selecting the desired grada-
tion time prior to starting the demo.
DEMO 2-Light Cycle button may be selected to start or
stop DEMO 2. This demo gradates up and blinks all uni-
versal LEDs starting with ULED1 to ULED9. After all
LEDs are up and blinking, the LEDs are gradated off
starting with ULED1 to ULED9. This is accomplished us-
ing the LTC3219's gradation and blinking modes.