QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 749 MULTIDISPLAY LED CONTROLLER LTC3206 DESCRIPTION 2 achieved via a 2-wire I C interface. The RGB or Sub Demonstration circuit 749 is a multi-display LED con- panel may be disabled with the ENRGB/S pin. Sixteen troller featuring the LTC3206. dimming states exist for the main panel, sub panel, and the red, green, and blue LEDs resulting in up to The LTC3206 is a highly integrated multi-display LED 4096 color combinations. controller. This device contains a high efficiency, low noise fractional step-up/step-down charge pump to The LTC3206 charge pump optimizes efficiency based provide power for a main and sub white LED display, on V and LED forward voltage conditions. The part IN plus an RGB color LED display. The LTC3206 re- powers-up in step-down mode and automatically quires only four small ceramic capacitors plus two switches to step-up mode once the first LED current resistors to form a complete 3-panel LED power sup- source begins to enter dropout. The charge pump can ply and a current controller. also be programmed to be in step-up mode using the 2 I C interface. Internal circuitry prevents inrush cur- Maximum currents for the main/sub and RGB dis- rent and excess input noise during start-up and mode plays are set independently with a single resistor. switching. Current for each LED is controlled with an internal current source. Dimming control for all displays is QUICK START PROCEDURE TM Demonstration circuit 749 is easy to setup to evalu- 3. Run the QuickEval program. The program de- ate the performance of the LTC3206. Refer to Figure tects the DC749 and displays the LTC3206 con- 1 for the proper measurement equipment setup and trol window (shown in Figure 2). follow the procedure below. 4. Attach a 2.7 4.5V power source to the V and IN 1. Connect DC749 to the DC590 USB Serial Control- GND turrets of the DC749 demo board. This is ler using the supplied 14-conductor ribbon cable the V power supply for the LTC3206 (see appli- IN as shown in Figure 1. Refer to the DC590 Quick cation schematic). Start guide for software installation details. 2. Attach the supplied USB cable to your computer and then to the DC590 controller board. 1 QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 749 MULTIDISPLAY LED CONTROLLER Figure 1. Proper Measurement Equipment Setup USING THE LTC3206 QUICKEVAL SOFTWARE 2 changed from 00 to FF, however the I C address of The program provides brightness controls for the the LTC3206 is preset to a hexadecimal address of Main, Sub, and RGB LEDs. The two check boxes 36. allow the Charge Pump to be forced on and the ENRGB/S pin to be toggled. The three pairs of ra- MAIN and SUB control These are vertical slide dio buttons allow the selection of either the RGB or controls which adjust the main and sub LEDs out- Sub panel to be disabled with the ENRGB/S pin, put from 0% to 100% by clicking on the up and AUX1 and/or AUX2 to be either Main or Sub LEDs. down arrows, a higher or lower tick, or by clicking There are four demo buttons and a CIE Chromaticity and dragging the slide pointer. diagram which allows direct selection of colors. The LEDS OFF button resets all LEDs to zero, stops RED, GREEN, and BLUE controls These are verti- and resets any demonstration in progress. An ad- cal slide controls which allow individual adjustment 2 dress select button allows the I C address to be of the red, green, and blue LEDs to make any of the 2