DC749A - Demo Manual

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 749
MULTIDISPLAY LED CONTROLLER
LTC3206
DESCRIPTION
Demonstration circuit 749 is a multi-display LED controller featuring the LTC3206.
The LTC3206 is a highly integrated multi-display LED
controller. This device contains a high efficiency, low
noise fractional step-up/step-down charge pump to
provide power for a main and sub white LED display,
plus an RGB color LED display. The LTC3206 requires only four small ceramic capacitors plus two
resistors to form a complete 3-panel LED power supply and a current controller.
Maximum currents for the main/sub and RGB displays are set independently with a single resistor.
Current for each LED is controlled with an internal
current source. Dimming control for all displays is
achieved via a 2-wire I2C interface. The RGB or Sub
panel may be disabled with the ENRGB/S pin. Sixteen
dimming states exist for the main panel, sub panel,
and the red, green, and blue LEDs resulting in up to
4096 color combinations.
The LTC3206 charge pump optimizes efficiency based
on VIN and LED forward voltage conditions. The part
powers-up in step-down mode and automatically
switches to step-up mode once the first LED current
source begins to enter dropout. The charge pump can
also be programmed to be in step-up mode using the
2
I C interface. Internal circuitry prevents inrush current and excess input noise during start-up and mode
switching.
QUICK START PROCEDURE
Demonstration circuit 749 is easy to setup to evaluate the performance of the LTC3206. Refer to Figure
1 for the proper measurement equipment setup and
follow the procedure below.
1.
Connect DC749 to the DC590 USB Serial Controller using the supplied 14-conductor ribbon cable
as shown in Figure 1. Refer to the DC590 Quick
Start guide for software installation details.
2.
Attach the supplied USB cable to your computer
and then to the DC590 controller board.
3.
Run the QuickEvalTM program. The program detects the DC749 and displays the LTC3206 control window (shown in Figure 2).
4.
Attach a 2.7 – 4.5V power source to the VIN and
GND turrets of the DC749 demo board. This is
the VIN power supply for the LTC3206 (see application schematic).
1
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 749
MULTIDISPLAY LED CONTROLLER
Figure 1. Proper Measurement Equipment Setup
USING THE LTC3206 QUICKEVAL SOFTWARE
The program provides brightness controls for the
Main, Sub, and RGB LEDs. The two check boxes
allow the Charge Pump to be forced on and the
ENRGB/S pin to be toggled. The three pairs of radio buttons allow the selection of either the RGB or
Sub panel to be disabled with the ENRGB/S pin,
AUX1 and/or AUX2 to be either Main or Sub LEDs.
There are four demo buttons and a CIE Chromaticity
diagram which allows direct selection of colors.
The LEDS OFF button resets all LEDs to zero, stops
and resets any demonstration in progress. An address select button allows the I2C address to be
changed from 00 to FF, however the I2C address of
the LTC3206 is preset to a hexadecimal address of
36.
MAIN and SUB control – These are vertical slide
controls which adjust the main and sub LEDs output from 0% to 100% by clicking on the up and
down arrows, a higher or lower tick, or by clicking
and dragging the slide pointer.
RED, GREEN, and BLUE controls – These are vertical slide controls which allow individual adjustment
of the red, green, and blue LEDs to make any of the
2
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 749
MULTIDISPLAY LED CONTROLLER
4096 colors available. The hex code and color are
displayed in small boxes below each of the sliders.
They too are adjusted by clicking on the up and
down arrows, a higher or lower tick, or by clicking
and dragging the slide pointer.
CIE Chromaticity diagram – Colors can be selected
by clicking on a specific color in the diagram. The
Gammut box, when checked, displays the Chromaticity coordinates of the Nichia NSCM315C RGB
diode forming a triangle or gammut of all the colors
which can be produced by that diode.
Force Charge Pump On check box – When this box
is selected the charge pump is forced on. The
charge pump is automatically selected while the
Rainbow and Light Cycle demos are activated, but
returns to its original state when the demos are deselected.
ENRGB/S check box – When this box is selected,
the ENRGB/S pin is high. When it is deselected the
pin is low and either the RGB or the Sub panel is
disabled depending on the selection of the
ENRGB/S radio buttons.
ENRGB/S option buttons – If RGB Control is selected, the RGB display will be disabled when the
ENRGB/S box is deselected. If the Sub Control is
selected, the Sub panel will be disabled when the
ENRGB/S box is deselected.
AUX1 & AUX2 Main/Sub option buttons – If the
Main button is selected, the applicable LED will
change illumination with the Main brightness control. If the Sub button is selected, the applicable
LED will change illumination with the Sub brightness control. The LTC3206’s maximum current set-
tings for the Main, Sub, and RGB panels are set by
R2 and R3 (see the attached DC749 schematic.) R2
= R3 = 15.8K, which set the maximum current to
15mA.
Demo Buttons – These buttons can be selected to
run 4 different demonstrations. Demo 1 and Demo
2 cycle through the brightness levels of the LEDs
using a feathering technique. Demo 4 randomly
changes colors also using the feathering technique.
The feathering technique is done by alternating between adjacent brightness levels at high speeds
with a duty cycle to produce a certain intensity level
between the two brightness levels (virtual step).
These demos use 7 virtual steps between each
brightness level giving it a total of 120 brightness
levels (8 X 15).
LEDS OFF button – This button will turn the brightness levels to zero on all of the LEDs and will turn
off and reset any active demo.
Select I2C Address button – Typically, the LTC3206
is preprogrammed with the hexadecimal I2C address
of 36, however, a different I2C address may be special ordered. In this event the appropriate I2C address will need to be selected. To do this, select the
Select I2C Address button. This button will display
UPDATE ADDRESS and the address selection box
will become active. Select the appropriate hexadecimal address in the address selection box. Then
select the Select I2C Address button to activate the
new address.
3
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 749
MULTIDISPLAY LED CONTROLLER
Figure 2. LTC3206 Control Window
4
5
4
3
2
1
1
D3
LED
WHITE
2
D4
LED
WHITE
RED
D
J5
4
2
1
M1
GRN
1
1
1
1
1
1
1
BLU
J4
D9
LED
COLOR
3
D2
LED
WHITE
2
D1
LED
WHITE
2
D6
LED
WHITE
2
D5
LED
WHITE
2
2
D8
LED
WHITE
1
D
D7
LED
WHITE
2
2
NOTES: UNLESS OTHERWISE SPECIFIED
M2
1
J9
J6
1
A1
M3
1
J8
J7
MAIN3
19
MAIN4
20
21
MAIN2
22
MAIN1
23
17
3
C2-
RED
16
4
C1-
VIN
15
5
C1+
CPO
14
6
C2+
SGND
13
IMS
J11
B
1
J12
G
1
C
J13
R
1
J14
CPO
1
C3
4.7uF
6.3V
12
7
U1
LTC3206EUF
IRGB
GREEN
11
1
SUB2
ENRGB/S
J18
SCL
C1
2.2uF
6.3V
2
SCL
C2
2.2uF
6.3V
18
10
1
SDA
BLUE
9
J17
R1
82
5%
SUB1
SDA
C
M4
1
1
8
1
DVCC
J21
S2
AUX2
1
S1
AUX1
25
PGND
J10
24
1
A2
J16
IRGB
1
J1
B
1
3
5
7
9
11
13
+
+
+
+
+
+
+
J15
2
4
6
8
10
12
14
+
+
+
+
+
+
+
R4
47K
5%
B
J19
R5
5.1K
5%
C4
Vin
2.7V to 4.5V
0.1uF
10V
Gnd
TP1
SMT
TP2
SMT
5
1
R6
5.1K
5%
1
A0
SDA
5
2
A1
Vcc
8
3
A2
6
SCLK
7
WP
C7
0.1uF
10V
Vss
J2
J20
1
J3
U2
A
ENRGB/S
1
HD2X7
R7
5.1K
5%
IMS
1
1
C5
0.1uF
10V
R2
15.8K
1%
C6
4.7uF
6.3V
R3
15.8K
1%
1
DVCC
LINEAR TECHNOLOGY CORPORATION
1630 McCarthy Blvd.
Milpitas, CA. 95035
Phone : (408) 954-8400 Fax : (408) 434-0507
Title
4
24LC025
A
Multidisplay LED Controller
1
Size
Document Number
Custom
4
3
Date:
DC749A
Friday, July 30, 2004
2
Rev
LTC3206EUF
Sheet
1
1
of
1
Bill Of Material
Demo Bd. #749A
Linear Technology Corporation
LTC3206EUF
6/20/2005
Item Qty Reference
1
2
3
4
5
6
7
8
9
10
11
12
13
14
3
2
2
2
8
1
1
1
3
2
1
1
1
0
C4,C5,C7
C1,C2
C3,C6
J2,J3
D1-D8
D9
J1
R1
R5,R6,R7
R2,R3
R4
U2
U1
TP1,TP2
Part Description
CAP., CHIP X5R 0.1uF 10V 10%
CAP., CHIP X5R 2.2uF 6.3V 20%
CAP., CHIP X5R 4.7uF 6.3V
TURRET TESTPOINT .064"
LED, SMT WHITE
LED, SMT COLOR RGB
SOCKET, 2X7 2MM STRAIGHT
RES., CHIP 82 OHM 5%
RES., CHIP 5.1K
5%
RES., CHIP 15.8K
1%
Res., CHIP 47K
5%
IC., SERIAL EEPROM
IC., MULTIDISPLAY LED CONTROLLER
OPT
Page 1 - of - 1
Manufacture / Part #
AVX, 0402ZD104K
0402
TAIYO YUDEN, JMK107BJ225MA 0603
TDK C1608X5R0J475M
MILL-MAX, 2308-02
NICHIA, NSCW100
NICHIA, NSCM315C
MOLEX/WALDOM 87331-1420
AAC CR05-820JM
0402
AAC CR05-512JM
0402
PANASONIC, ERJ-2RKF1582X
0402
AAC CR05-473JM
0402
MICROCHIP
24LC025
TSSOP8
LINEAR TECHNOLOGY, LTC3206EUF
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