EZ-Color TM HB LED Controllers. 2 Cypress Confidential Dramatic New Lighting Applications Never-before seen color performance and flexibility provide.

EZ-ColorTM HB LED Controllers

2 Cypress Confidential

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


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


Color Mix System: Current Solution

Switching Regulators• Provides constant currentsource to LEDs (350mA per LED)• National, Linear Tech, Zetex

Microcontrollers• Manages LED brightness & color output• Accomplishes dimmingthrough PWM channels• 1 PWM channel per color

SR

SR

SR

MicroOptic/Diffuser•LED Array •Diffusing material toProtect users and to aid in color uniformity

To hostcontroller

Light Engine

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

Temp/Color Sensor


Design challenges with HB LEDs

SR

SR

SR

Micro

Temp/Color Sensor

LED Shortcomings Customer Challenge Customer Need

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

Difficult to achieve repeatable color point

Flexibility at production time

Temp Variation: LEDs degrade over temp, different color LEDs degrade at different rates

Difficult to maintain color point over time

Color control during production


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

HB LED Challenges: Binning

Green

Blue

Bin“K”

Bin“L”

• Inaccurate Color Mixing• No production consistency for end systems

Bin“J”

Red

LED


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


Firmware, firmware, firmware• Map out possible permutations &

incorporate into code – very inefficient

How it could be done

– OR –

Use specific bin for a LED• 10-15% premium for mandating

specific HB LED bins IF available


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


Design

Simulate

Build

Program & Monitor


•Select Luxeon K2 3-LED Color Mixing Driver


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


•Choose Temp Sensor, set Properties


•Part numbers are selectable for dominant wavelength and Flux/Color bins

•Change Bins selected and the gamut will adjust on the CIE chart


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


•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”


Use the Monitor function to Tune the desired fixed color point


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

EZ-ColorTM HB LED Controller Advantages


EZ-ColorTM Technology: PrISM

PrISM creates a spread spectrum signal, which provides significant EMI reduction and reduces low frequency flicker of HB LEDs

PWM PrISMVH

VL

50% dimming

VH

VL

High noise spikesNo Harmonic spikes

Low EMI


EZ-ColorTM HB LED Controllers

• 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 on July 18th

12

12

6

Analog Blocks

Yes32KB16CY8CLED16

Yes16KB8CY8CLED08

Yes16KB4CY8CLED04

DMX512FlashLED ChannelsPart Number

LED RADIATIONDO NOT STARE INTO BEAMCLASS 3 LASER PRODUCT

BLUE GREEN RED


Appendix


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)


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


Color Mixing Basics: Cyan

R G B

100%

50%

Inte

nsit

y


Color Mixing Basics: White

R G B

100%

50%

Inte

nsit

y


Color Mixing Basics: Yellow

R G B

100%

50%

Inte

nsit

y


CY3261A-RGB – From block diagram to PSoC Express®

M8C Core:

FLASH RAM EEPROM Emulation

Color Mix Firmware

Temperature Comp

PSoC

ADC

THERMISTORPlace Near

LEDs

SSDM B

LM3402

LM3402

LM3402

SSDM G

SSDM R

VDD

VDC

VDDVF_RED

VF_GRN

VF_BLU

VF_RED

VF_GRN

VF_BLU

I2C

SSDM Blocks

I2C

Analog


CY3261A-RGB – Color Mix Firmware

Even Loop?

~10msLoopTime

Power On

Initialization

Loop Timer

Direct ControlMode?

Color Mix

N

Y

Y

N

Y

N

Board On?

Drive LEDs withDimming Values

Turn LEDsOff

TemperatureCompensation

I2C DataStructure

I2C Interrupt

• 5ms to compute a new color• Color mix computations

detailed in Lumileds AB-xx

• Prepackaged firmware solution


EZ-Color Temperature Solution

• Add Thermistor to the board• PSoC Express offers prepackaged

firmware solution

• Measure TB

• Calculate TJ

• Compensate for Δ TJ

ADC

RTHERM

Regulated VDD

Adjust x and y

TempComp(NewTJ)

YES

NODiff > TEMP_FACTOR

Diff = NewTJ – 25°

Return

fLEDJBBJ VITT


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


DMX512 – Now available with EZ-Color!

• Serial communication interface

• Available with all EZ-Color devices

EZ-Color TM HB LED Controllers. 2 Cypress Confidential Dramatic New Lighting Applications Never-before seen color performance and flexibility provide.

Documents

ezcolor slide

color sensors

led color mixing driver

inaccurate color

color uniformity

led driver slide

led brightness color

cypress confidential