SENSOR-DRIVEN LIGHTING

Features of Sensor-Driven Lighting

How Does Daylight Harvesting Work?

Daylight Harvesting Sensor Fixtures	Energy Savings with Daylight Harvesting
ALS sensor detects high and low daylight contribution and signals dimming/increasing illumination to light fixture.	When lights dim using Daylight Harvesting you are saving over 30% of energy

System Overview

ams Devices	TSL4531	TCS3472	aLC	AS3691-6	Benefits
	Not a photo Diode	RGB Sensor	Lighting Controller Code	Precision LED Driver	System Level Solutions
Daylight Harvesting					>50% Energy Savings	Auto Lumen Maintenance
Color Tunable					Adjust Color Temp in Lamp	Color Maintenance

Target Applications

Outdoor/Street Lighting Roads/Pathways Transportation Stations Parking Lots Commercial Lighting Office Buildings Hotels Restaurants Schools		Industrial Lighting Warehouses Factories Shipping Yards Specialty/Retail Lighting Decorative Lighting Mood Lighting Point-of-Sales

TSL4531 - Digital Ambient Light Sensor

A digital daylight sensor is built into the luminaire that automatically responds to its environment is a perfect solution for reducing energy consumption and costs. The TSL4531 combines photopic, human-like sensitivity with wide dynamic range which enables a new generation of lighting controls to be built directly into replacement lamps and luminaires to shift more of the interior lighting burden seamless onto available daylight.

Main Features:

• Photopic response that mimics the human eye in color sensitivity, while excluding IR and ultraviolet energy
• Wide dynamic range with high lux capability up to 220K – twice the brightness of sunlight
• Digital I2C interface that readily connects to a microcontroller and additional wired or wireless networking
• Affordable enough to be built into LED replacement lamps and lighting instruments
• Low power, using only 110 uA in active mode and 2.2uA in power down state
• Small size at 2mm square, its small enough to fit into almost any LED luminaire.

Supporting Tools and Information

• Datasheet

ams Lighting Controller

The ams lighting controller (aLC) connects the digital optical sensors to the precision LED drivers to provide a complete lighting solution that can be easily commissioned and deployed.

The aLC (ams Lighting Controller) is code that runs on a Microchip PIC24F:

• Interfaces the TSL4531 or TCS3472 on one side of the PIC24 processor
• Connects the PIC24F to the LED drivers AS3691/6 on the other side
• Process the information from the sensors for daylight processing or color temperature processing to generate adequate light
• Commissions the lamp for adequate operation

Code can be run as a custom process with the ams Lighting API - please contact ams directly for licensing the source code at SensorDrivenLighting@ams.com

AS3696 - 4 Channel Precision LED Driver With external FETs

The AS3696 is a 4 channels precision LED controller with PWM inputs or internal PWM generator for driving external FETs in precise lighting applications. Build in safety features include thermal shutdown as well as open and short LED detection.

Features:

• Current accuracy +/- 1%
• Channel to channel matching +/- 1%
• Open and shorts detection
• Digital or analog PWM input
• High output voltage compliance, limited by external FETs
• Integrated over-temperature protection

Supporting Tools and Information

• Product Brief

AS3691 - Quad Channel Precision LED Driver With Integrated FETs

The AS3691 features four high precision current sources for driving up to four LED strings. Each of the four currents sources can be controlled independently by PWM inputs. The full scale current value is set by external resistors.

Features:

• Current Accuracy +/- 0.5%
• 4 High precision 400ma constant current drivers
• integrated FETs
• Integrated 4 channel Dimming control
• Adaptive supply regulation for maximum efficiency
• High output voltage compliance 0.41V to 15V
• Integrated over-temperature protection

Supporting Tools and Information

• Datasheet
• Product Brief
• Evaluation Board

TCS3472 - Digital Color Light Sensor

Enabling Color Adaption to Daylight Changes for Indoor Lighting

The TCS3472 device provides a digital return of red, green, blue (RGB), and clear light sensing values. An IR blocking filter, integrated on-chip and localized to the color sensing photodiodes, minimizes the IR spectral component of the incoming light and allows color measurements to be made accurately. The high sensitivity, wide dynamic range, and IR blocking filter makes the TCS3472 an ideal color sensor solution for use under varying lighting conditions and through attenuating materials.

Features:

• Cost Savings with built-in IR filter to accurately measure visible light for color measurements
• Color temperature adjustment can be used with daylight compensation to maintain the ambient lighting closer to a target color temperature
• Feedback color sensors control adjustments to the luminaires
• Excellent Accurate Readings with 4 analog to digital converts that read the red, green, blue & clear

Technical Specs:

• Programmable interrupt function with user-defined upper and lower threshold setting
• In-package trim provides an easy and accurate means to achieve system-to-system repeatability
• 16-bit digital output with I²C at 400kHz
• Programmable analog gain and integration time supporting 1,000,000 - to - 1 dynamic range
• Low Power Wait State Operation, 65 uA Typical Current, Sleep Mode — 2.5 uA Typical Current
• Wait Timer is Programmable from 2.4 ms to > 7 Seconds

Supporting Tools and Information

• Datasheet