QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 629 MULTI-DISPLAY LED CONTROLLER LTC3205 DESCRIPTION Demonstration circuit 629 is a multi-display LED controller 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 provide 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 combinations. The LTC3205 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. Internal circuitry prevents inrush current and excess input noise during startup 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: 3. Run the QuickEvalTM program. The program detects 1. Connect DC629 to the DC590 USB Serial Controller turrets of the DC629 demo board. This is the VIN power supply for the LTC3205 (see attached schematic). 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. 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 NOTE: The LTC3205's maximum current settings for Main, Sub, and RGB are set by R2 and R3 (see the attached 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 selection 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 controls 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 horizontal 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 adjusted 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 coordinates of the Nichia NSCM315C RGB diode forming a triangle or gamut of all the colors which can be produced by that diode. BRIGHTNESS -- This is a horizontal slider used to adjust 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 buttons 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 2 3 4 5 1 D5 LED WHITE 2 D6 LED WHITE 2 1 S1 GRN A RED J18 1 1 1 1 1 1 BLU J19 D7 LED COLOR 1 4 D4 LED WHITE 2 D3 LED WHITE 2 2 D2 LED WHITE 3 A D1 LED WHITE 2 2 NOTES: UNLESS OTHERWISE SPECIFIED J20 M4 J17 1 1 1 1 4 C1- CPO 15 5 C1+ Ims 14 6 C2+ Irgb 13 12 Din 7 U1 LTC3205EUF DVcc 16 C G 19 GREEN 20 BLUE Vin STEPUP 1 SUB2 C2- ENRGB J7 SCLK C2 1uF 6.3V 21 17 11 C1 1uF 6.3V 22 SGND 10 1 DIN SUB1 MAIN1 3 LD 2 9 J6 23 RED SCLK MAIN2 18 1 M1 R1 82 5% 1 8 J5 MAIN4 1 M2 MAIN3 25 PGND J4 B B J16 24 J21 M3 S2 B J15 1 R J13 1 C3 1uF 6.3V CPO J12 1 R2 33.2K 1% C4 0.1uF 10V R3 33.2K 1% IMS C J11 1 IRGB J1 1 3 5 7 9 11 13 + + + + + + + 2 4 6 8 10 12 14 + + + + + + + J8 1 R4 5.1K J9 1 HD2X7 D Vin 2.7V to 4.5V R5 5.1K 5% TP1 E SMT TP2 SMT 1 1 R6 5.1K 5% 1 A0 SDA 5 2 A1 Vcc 8 3 A2 6 SCLK 7 C7 0.1uF 10V Vss WP J2 ENRGB D J10 1 J3 Gnd U2 R7 5.1K 5% LD C5 0.1uF 10V 1 C6 1uF 6.3V DVCC 1 LINEAR TECHNOLOGY CORPORATION 1630 McCarthy Blvd. Milpitas, CA. 95035 Phone : (408) 954-8400 Fax : (408) 434-0507 Title 4 24LC025 E Multidisplay LED Controller 1 2 3 Size A Document Number Rev Date: Thursday, February 06, 2003 DC629A 4 LTC3205EUF Sheet 1 of 5 1 1 2 3 4 5 1 D5 LED WHITE 2 D6 LED WHITE 2 1 S1 GRN A RED J18 1 1 1 1 1 1 BLU J19 D7 LED COLOR 1 4 D4 LED WHITE 2 D3 LED WHITE 2 2 D2 LED WHITE 3 A D1 LED WHITE 2 2 NOTES: UNLESS OTHERWISE SPECIFIED J20 M4 J17 1 1 1 1 4 C1- CPO 15 5 C1+ Ims 14 6 C2+ Irgb 13 12 Din 7 U1 LTC3205EUF DVcc 16 C G 19 GREEN 20 BLUE Vin STEPUP 1 SUB2 C2- ENRGB J7 SCLK C2 1uF 6.3V 21 17 11 C1 1uF 6.3V 22 SGND 10 1 DIN SUB1 MAIN1 3 LD 2 9 J6 23 RED SCLK MAIN2 18 1 M1 R1 82 5% 1 8 J5 MAIN4 1 M2 MAIN3 25 PGND J4 B B J16 24 J21 M3 S2 B J15 1 R J13 1 C3 1uF 6.3V CPO J12 1 R2 33.2K 1% C4 0.1uF 10V R3 33.2K 1% IMS C J11 1 IRGB J1 1 3 5 7 9 11 13 + + + + + + + 2 4 6 8 10 12 14 + + + + + + + J8 1 R4 5.1K J9 1 HD2X7 D Vin 2.7V to 4.5V R5 5.1K 5% TP1 E SMT TP2 SMT 1 1 R6 5.1K 5% 1 A0 SDA 5 2 A1 Vcc 8 3 A2 6 SCLK 7 C7 0.1uF 10V Vss WP J2 ENRGB D J10 1 J3 Gnd U2 R7 5.1K 5% LD C5 0.1uF 10V 1 C6 1uF 6.3V DVCC 1 LINEAR TECHNOLOGY CORPORATION 1630 McCarthy Blvd. Milpitas, CA. 95035 Phone : (408) 954-8400 Fax : (408) 434-0507 Title 4 24LC025 E Multidisplay LED Controller 1 2 3 Size A Document Number Rev Date: Thursday, February 06, 2003 DC629A 4 LTC3205EUF Sheet 1 of 5 1 Bill Of Material Demo Bd. #629A Linear Technology Corporation LTC3205EUF 6/17/2005 Item Qty Reference 1 2 3 4 5 6 7 8 9 10 11 12 3 4 2 6 1 1 1 4 2 1 1 0 C4,C5,C7 C1,C2,C3,C6 J2,J3 D1-D6 D7 J1 R1 R4,R5,R6,R7 R2,R3 U2 U1 TP1,TP2 Part Description Manufacture / Part # CAP., CHIP X5R 0.1uF 10V CAP., CHIP X5R 1uF 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 32.4K 1% IC., SERIAL EEPROM IC., MULTIDISPLAY LED CONTROLLER OPT. AVX, 0402ZD104K 0402 TAIYO YUDEN, JMK107BJ105MA 0603 MILL-MAX, 2308-02 NICHIA, NSCW100 NICHIA, NSCM315C MOLEX/WALDOM 87331-1420 AAC CR05-820JM 0402 AAC CR05-512JM 0402 PANASONIC ERJ-2RKF3242X 0402 MICROCHIP 24LC025 TSSOP8 LINEAR TECHNOLOGY, LTC3205EUF OPT. Page 1 - of - 1