EZ-Color

TM

Controllers HB LED

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Dramatic New Lighting Applications

Never-before seen color performance and flexibility provide unique advantages in traditional lighting markets, such as architectural lighting, signage, and many more

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Making the Leap EZ!

• Additional color performance provides unique design challenges • Fixed color point • C programming • Complex design • EZ-Color bridges the gap for light designers with a visual design tool

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Color Mix System: Current Solution

Light Engine

SR

To host controller

Micro

SR SR Optic/Diffuser

•LED Array •Diffusing material to Protect users and to aid in color uniformity

Temp/Color Sensor

•

Microcontrollers

Manages LED brightness & color output • Accomplishes dimming through PWM channels • 1 PWM channel per color •

Switching Regulators

Provides constant current source to LEDs (350mA per LED) • National, Linear Tech, Zetex

Sensors

• Temperature or Color sensors to provide feedback to micro • Temp: National and others • Color: TAOS, ST, Avago, Capella

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Design challenges with HB LEDs

Micro SR SR SR Temp/Color Sensor LED Shortcomings Customer Challenge Binning

: LEDs are spec’d by chromaticity, brightness, and power

Temp Variation

: LEDs degrade over temp, different color LEDs degrade at different rates Difficult to achieve repeatable color point Difficult to maintain color point over time

Customer Need

Flexibility at production time Color control during production

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HB LED Challenges: Binning

The same color LED varies in output and is classified by bins

LED Bin “J” Bin “K” Bin “L” Red Green

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Blue

• Inaccurate Color Mixing • No production consistency for end systems

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HB LED Challenges: Temperature

Temperature effects • Light output decreases • Wavelength increases • Forward voltage decreases LEDs degrade at different rates Added complexity in controlling a color mixed output over time

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How it could be done

Firmware, firmware, firmware • Map out possible permutations & incorporate into code – very inefficient – OR – Use specific bin for a LED • 10-15% premium for mandating specific HB LED bins IF available

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HB LED design with ZERO Code

• PSoC Express 3.0 – Visual Embedded Design Tool • Powerful new tool for lighting applications • Create single or multiple color channel designs in minutes with ZERO “C” necessary • LED-specific Express drivers for EZ-Color

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Design Simulate Build Program & Monitor

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11 •Select Luxeon K2 3-LED Color Mixing Driver

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12 •Name the Output Driver, read the Datasheet for more information on functionality

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13 •Choose Temp Sensor, set Properties

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14 •Part numbers are selectable for dominant wavelength and Flux/Color bins •Change Bins selected and the gamut will adjust on the CIE chart

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15 •Add Valuators (Variables) to control the output of the 3LED driver

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16 •Add additional logic valuators to vary the color •For examples of the functionality and flexibility of EZ Color and PSoC Express, download EZ Color “Express Designs”

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17 Use the Monitor function to Tune the desired fixed color point

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EZ-Color

TM

Advantages HB LED Controller

Software

• PSoC Express offers unparalleled time to market performance • Binning compensation improves color accuracy • Temperature Compensation Algorithm offers color stability

Integration

• Configurable dimmers support up to 16 LED channels • Dimmers independently programmable from 8-32 bits of resolution

Technology

• PrISM method reduces low frequency blinking inherent with PWMs • Spread spectrum signal lowers radiated EMI

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V H V L

EZ-Color

TM

Technology: PrISM

PWM PrISM

V H

50% dimming

V L High noise spikes No Harmonic spikes Low EMI 19 PrISM creates a spread spectrum signal, which provides significant EMI reduction and reduces low frequency flicker of HB LEDs

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EZ-Color

TM

HB LED Controllers

20 • Cypress offers the industry’s most complete color mix solution • All collateral available on www.cypress.com/ezcolor • HB LED drivers in Express 3.0

• CY3261A-RGB board with Demo / Example projects • Color Mixing Application Notes • Training • Learn more at the NetSeminar

LED RADIATION DO NOT STARE INTO BEAM CLASS 3 LASER PRODUCT

on July 18th BLUE GREEN RED

Part Number CY8CLED04 CY8CLED08 CY8CLED16 LED Channels

4 8 16

Analog Blocks

6 12 12

Flash

16KB 16KB 32KB

DMX512

Yes Yes Yes

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Appendix

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Color Mixing Basics

• Mixing Red, Green, and Blue generates a color • Red + Green = Yellow • Blue + Red = Magenta • CIE chart developed to provide science behind color • Color space defined with (x,y,Y) coordinates • x and y define chromaticity (color) • Y define luminance (brightness)

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Color Mixing Basics

• HB LEDs defined in (x,y) coordinates Red: (.68, .29) Green: (.23, .63) Blue: (.15, .06) • These HB LEDs form a color gamut • Output any color within the triangle

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Color Mixing Basics: Cyan

100% 50% R G B

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Color Mixing Basics: White

100% 50% R G B

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Color Mixing Basics: Yellow

100% 50% R G B

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CY3261A-RGB – From block diagram to PSoC Express®

SSDM Blocks VDC V DD M8C Core: PSoC FLASH RAM EEPROM Emulation Color Mix Firmware Temperature Comp SSDM R SSDM G LM3402 LM3402 VF_RED VF_GRN I2C I2C SSDM B LM3402 ADC VF_RED VF_GRN VF_BLU V DD Analog THERMISTOR Place Near LEDs

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VF_BLU

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CY3261A-RGB – Color Mix Firmware

• 5ms to compute a new color • Color mix computations detailed in Lumileds AB-

xx

Power On Initialization Loop Timer I2C Interrupt • Prepackaged I2C Data Structure firmware solution Even Loop?

N Y Y Direct Control Mode?

N Color Mix Temperature Compensation ~10ms Loop Time Board On?

N Y Drive LEDs with Dimming Values Turn LEDs Off

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EZ-Color Temperature Solution

• Add Thermistor to the board TempComp(NewTJ) • PSoC Express offers prepackaged firmware solution Diff = NewTJ – 25° • Measure T B • Calculate T J • Compensate for Δ T J Regulated V DD Diff > TEMP_FACTOR NO YES ADC Adjust x and y

T J



T B

 

JB I LED V f

R THERM Return

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PWM Dimming Available

• The choice is up to the designer • 8 bit channel • 16 bit channel • Any iteration between 8 and 16 also available utilizing two 8 bit blocks • Clock options utilize three internal clock dividers, from 24 MHz down to >100 Hz • PSoC Dimming blocks can be tied together, up to 32 bits

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DMX512 – Now available with EZ-Color!

• Serial communication interface • Available with all EZ-Color devices 31

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