QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 629
MULTI-DISPLAY LED CONTROLLER
LTC3205
DESCRIPTION
Demonstration circuit 629 is a multi-display LED con-
troller featuring the LTC3205.
The LTC3205 is a highly integrated multi-display LED
controller. This device contains a high efficiency, low
noise fractional step-up/step-down charge pump to pro-
vide power for a main and sub white LED display, plus
an RGB color LED display. The LTC3205 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 and ON/OFF control for all displays is achieved
via a 3-wire serial interface. Four dimming states exist
for the main and sub panel displays and 16 dimming
states are available via internal PWM for the red, green,
and blue LEDs resulting in up to 4096 color combina-
tions.
The LTC3205 charge pump optimizes efficiency based
on V
IN
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. Internal circuitry pre-
vents inrush current and excess input noise during start-
up and mode switching.
QUICK START PROCEDURE
Demonstration circuit 629 is easy to set up to evaluate
the performance of the LTC3205. Refer to Figure 1 for
proper measurement equipment setup and follow the
procedure below:
1.
Connect DC629 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 into your computer and
then into the DC590 controller board.
3.
Run the QuickEval
™
program. The program detects
the DC629 and displays the LTC3205 control window
(shown in Figure 2).
4.
Attach a 2.7V–4.5V power source to the Vin and GND
turrets of the DC629 demo board. This is the V
IN
power supply for the LTC3205 (see attached sche-
matic).
NOTE:
The LTC3205’s maximum current settings for
Main, Sub, and RGB are set by R2 and R3 (see the at-
tached DC629 schematic.) R2 = R3 = 32.4k, which set
the maximum current to 15mA.
1
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 629
MULTI-DISPLAY LED CONTROLLER
Figure 1.
Proper Measurement Equipment Setup
USING THE LTC3205 QUICKEVAL SOFTWARE
The program provides brightness controls for the Main,
Sub, and RGB LEDs, an OFF/ON button which controls
output to the DC629 demo board, three demo buttons,
and a CIE Chromaticity diagram which allows direct se-
lection of colors.
OFF/ON —
Click this button to begin outputting data to
the LTC3205. The default state is
OFF
. The 16-bit hex
code transmitted to the LTC3205 is shown in the
HEX
OUT
box when this button is on.
MAIN and SUB control —
These are vertical slide con-
trols which adjust the main and sub LED 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 horizon-
tal slide controls which allow individual adjustment of
the red, green, and blue LEDs to make any of the 4096
colors available. The hex code and color are displayed in
small boxes to the right of each slider. They too are ad-
justed by clicking on the left and right 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 Gamut
box, when checked, displays the Chromaticity coordi-
nates of the Nichia NSCM315C RGB diode forming a
triangle or gamut of all the colors which can be pro-
duced by that diode.
BRIGHTNESS —
This is a horizontal slider used to ad-
just the intensity of a color that has been chosen. It is
also adjusted by clicking on the left and right arrows, a
2
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 629
MULTI-DISPLAY LED CONTROLLER
higher or lower tick or by clicking and dragging the slide
pointer.
DEMO 1, 2, and 3 –
These buttons can be selected to
run 3 different demonstrations. The OFF/ON button must
be
ON
to see the demonstrations.
Quick Start Guide, LTC3205 Data Sheet –
These but-
tons will open this document and the LTC3205 data
sheet, respectively. This requires Adobe Acrobat reader
and either an internet connection or copies of these
documents in the local documentation directory.
Figure 2.
LTC3205 Control Window
3
1
1
2
2
3
3
4
4
5
5
A A
B B
C C
D D
E E
NOTES: UNLESS OTHERWISE SPECIFIED
5%
5%
5%
1%1%
2.7V to 4.5V
Vin
5%
DC629A LTC3205EUF
Multidisplay LED Controller
LINEAR TECHNOLOGY CORPORATION
1630 McCarthy Blvd.
Milpitas, CA. 95035
Phone : (408) 954-8400 Fax : (408) 434-0507
A
11Thursday, February 06, 2003
Title
Size Document Number Rev
Date: Sheet of
J3
Gnd 1
TP1
SMT 1
J18
S2
1
D1
LED
WHITE
21
J9
ENRGB
1
R3
33.2K
J10
DVCC
1
D2
LED
WHITE
21
C3
1uF
6.3V
D3
LED
WHITE
21
R2
33.2K
D4
LED
WHITE
21
J17
B
1
D5
LED
WHITE
21
C6
1uF
6.3V
C7
0.1uF
10V
U2
24LC025
1
6
3
4
5
2
7
8
A0
SCLK
A2
Vss
SDA
A1
WP
Vcc
D6
LED
WHITE
21
J20
M4 1
J16
G
1
REDGRNBLU
D7
LED
COLOR
2
13
4
R1
82
C1
1uF
6.3V
R7
5.1K
C5
0.1uF
10V
J15
R
1
J21
M3 1
R4
5.1K
R6
5.1K
U1
LTC3205EUF
4
1
8
7
6
5
2
3
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
C1-
MAIN2
SCLK
Din
C2+
C1+
MAIN1
C2-
LD
ENRGB
STEPUP
DVcc
Irgb
Ims
CPO
Vin
SGND
RED
GREEN
BLUE
SUB2
SUB1
MAIN4
MAIN3
PGND
J4
M2 1
TP2
SMT 1
J13
CPO
1
J19
S1 1
J5
M1 1
C2
1uF
6.3V
J6
DIN 1
J1
HD2X7
1
3
5
7
9
11
13
2
4
6
8
10
12
14
+
+
+
+
+
+
+
+
+
+
+
+
+
+
C4
0.1uF
10V
J12
IMS
1
R5
5.1K
J7
SCLK 1
J11
IRGB
1
J2
1
J8
LD
1
1
1
2
2
3
3
4
4
5
5
A A
B B
C C
D D
E E
NOTES: UNLESS OTHERWISE SPECIFIED
5%
5%
5%
1%1%
2.7V to 4.5V
Vin
5%
DC629A LTC3205EUF
Multidisplay LED Controller
LINEAR TECHNOLOGY CORPORATION
1630 McCarthy Blvd.
Milpitas, CA. 95035
Phone : (408) 954-8400 Fax : (408) 434-0507
A
11Thursday, February 06, 2003
Title
Size Document Number Rev
Date: Sheet of
J3
Gnd 1
TP1
SMT 1
J18
S2
1
D1
LED
WHITE
21
J9
ENRGB
1
R3
33.2K
J10
DVCC
1
D2
LED
WHITE
21
C3
1uF
6.3V
D3
LED
WHITE
21
R2
33.2K
D4
LED
WHITE
21
J17
B
1
D5
LED
WHITE
21
C6
1uF
6.3V
C7
0.1uF
10V
U2
24LC025
1
6
3
4
5
2
7
8
A0
SCLK
A2
Vss
SDA
A1
WP
Vcc
D6
LED
WHITE
21
J20
M4 1
J16
G
1
REDGRNBLU
D7
LED
COLOR
2
13
4
R1
82
C1
1uF
6.3V
R7
5.1K
C5
0.1uF
10V
J15
R
1
J21
M3 1
R4
5.1K
R6
5.1K
U1
LTC3205EUF
4
1
8
7
6
5
2
3
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
C1-
MAIN2
SCLK
Din
C2+
C1+
MAIN1
C2-
LD
ENRGB
STEPUP
DVcc
Irgb
Ims
CPO
Vin
SGND
RED
GREEN
BLUE
SUB2
SUB1
MAIN4
MAIN3
PGND
J4
M2 1
TP2
SMT 1
J13
CPO
1
J19
S1 1
J5
M1 1
C2
1uF
6.3V
J6
DIN 1
J1
HD2X7
1
3
5
7
9
11
13
2
4
6
8
10
12
14
+
+
+
+
+
+
+
+
+
+
+
+
+
+
C4
0.1uF
10V
J12
IMS
1
R5
5.1K
J7
SCLK 1
J11
IRGB
1
J2
1
J8
LD
1
Linear Technology Corporation
LTC3205EUF
Bill Of Material
Demo Bd. #629A
6/17/2005
Item Qty Reference Part Description Manufacture / Part #
1 3 C4,C5,C7 CAP., CHIP X5R 0.1uF 10V AVX, 0402ZD104K 0402
2 4 C1,C2,C3,C6 CAP., CHIP X5R 1uF 6.3V TAIYO YUDEN, JMK107BJ105MA 0603
3 2 J2,J3 TURRET TESTPOINT .064" MILL-MAX, 2308-02
4 6 D1-D6 LED, SMT WHITE NICHIA, NSCW100
5 1 D7 LED, SMT COLOR RGB NICHIA, NSCM315C
6 1 J1 SOCKET, 2X7 2MM STRAIGHT MOLEX/WALDOM 87331-1420
7 1 R1 RES., CHIP 82 Ohm 5% AAC CR05-820JM 0402
8 4 R4,R5,R6,R7 RES., CHIP 5.1K 5% AAC CR05-512JM 0402
9 2 R2,R3 RES., CHIP 32.4K 1% PANASONIC ERJ-2RKF3242X 0402
10 1 U2 IC., SERIAL EEPROM MICROCHIP 24LC025 TSSOP8
11 1 U1 IC., MULTIDISPLAY LED CONTROLLER LINEAR TECHNOLOGY, LTC3205EUF
12 0 TP1,TP2 OPT. OPT.
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