TSL2560EVM TAOS, TSL2560EVM Datasheet

Optical Sensor Development Tools Evaluation Module w/USB Interface

TSL2560EVM

Manufacturer Part Number
TSL2560EVM
Description
Optical Sensor Development Tools Evaluation Module w/USB Interface
Manufacturer
TAOS
Datasheet

Specifications of TSL2560EVM

Description/function
Ambient Light Sensor
For Use With/related Products
TSL2560
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
TSL2560/61 EVM
An Evaluation System for the TSL2560/61 LTD Ambient Light Sensor
ALS I
TAOS’ Light-to-Digital (LTD) Ambient Light Sensor (ALS) solution can be used to automatically adjust
the brightness level of a computer display under a wide range of lighting conditions. As one of the
primary benefits of using TAOS’ ALS, battery life can be significantly extended by minimizing the
necessary power required to luminate a display under various lighting conditions. In PC notebooks,
for example, the display panel and inverter (which delivers the power to the display panel) comprise
approximately one-third (1/3) of the total power consumption. TAOS’ ALS helps control the display
backlight and keypad illumination in portable equipment like notebooks, PDAs, and cell phones. There
are other applications supported by the ALS which include street light control, security lighting,
sunlight harvesting, machine vision and automotive instrumentation clusters.
TAOS’ ALS can also help extend the longevity of the LCD lamp life by automatically controlling the
display brightness or luminance. Lamp life depends strongly on the lamp current and is directly
proportional to display brightness levels. Unnecessarily over-driving the display with high operating
currents and excessive brightness will prematurely degrade the lamp life of a display. Automatically
controlling the illuminance to extend lamp life is beneficial in a variety of applications:
Thirdly, since TAOS’ ALS closely approximates the response of the human eye, it can also help
improve visual performance. While eyestrain is not believed to permanently damage one’s eyes or
cause a loss of vision, it can be very uncomfortable and lead to a loss of productivity. Using TAOS’
ALS, excessive display brightness can be eliminated and productivity can be increased by maintaining
an optimal brightness level under various lighting conditions.
E
The TSL2560/61 EVM helps facilitate evaluation of the TAOS’ LTD ALS. A Universal Serial Bus (USB)
evaluation module is available which simply connects to the USB port of a personal computer.
Figure 1 is a picture of the USB evaluation module.
The TSL2560/61 device combines a visible light blocking photodiode with a broadband photodiode on
a single CMOS integrated circuit. This combination enables either device to be used to calculate light
intensity in lux over an effective 20-bit dynamic range with a 16-bit resolution without the use of an
expensive filter. Two integrating analog-to-digital converters (ADC) convert the photodiode currents
User’s Guide
VALUATION
Mobile users who frequently use notebook computers in different ambient lighting conditions
Digital monitors with on-screen controls to extend the display life and lower power consumption
Kiosks that continuously operate 24/7 in sunlight or artificial lighting
Automatically adjusting automobile display clusters (e.g. for navigation system) for safety to retain
the driver’s eyes on the road ahead at all times and eliminate glare to achieve better visibility at
night
NTRODUCTION
M
ODULE
O
VERVIEW
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www.taosinc.com

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TSL2560EVM Summary of contents

Page 1

... Thirdly, since TAOS’ ALS closely approximates the response of the human eye, it can also help improve visual performance. While eyestrain is not believed to permanently damage one’s eyes or cause a loss of vision, it can be very uncomfortable and lead to a loss of productivity. Using TAOS’ ALS, excessive display brightness can be eliminated and productivity can be increased by maintaining an optimal brightness level under various lighting conditions ...

Page 2

... Click ‘Control Panel -> System -> Hardware -> Device Manager -> Universal Serial bus controllers’ Highlight the appropriate FTDI driver in the list Right mouse on the highlighted driver and select "Update". Note: The driver can found in the FTDI directory on the CD-ROM D D RIVER ESCRIPTION interface) device is ideal for TMB Daughterboard www.taosinc.com ...

Page 3

... Channel 0 digital output. Graphical User Interface (GUI) The TSL2560 GUI is composed of three dialogs: Automatic Brightness Control Configuration, Advanced, and Monitor. A fourth dialog (Main) is hidden and manages the ALS’ system tray icon, menu, and profile selection ONTROL EMO www.taosinc.com ...

Page 4

... AC (for external power) and the AC Profile provides optimal viewing for varying ambient light Batteries Profile is to extend the battery life by automatically dimming AC Batteries to profile when the power level is below a specified Batteries display brightness Since it is www.taosinc.com ...

Page 5

... Ambient Light Threshold describes the percentage change in ambient light condition to detect. For example, small changes in ambient light can be filtered out while only “significant” changes are detected. profiles at which the nit level of the LCD panel is set for each Figure 3. Advanced Dialog www.taosinc.com ...

Page 6

... This feature filters large changes in light such as a shadow moving across the light sensor and prevents display “bouncing.” TAOS suggests exposing Backlight Transition Speed, Ambient Light Threshold, and Duration of Change Outside Threshold on a user interface in order to provide some level of end-user customization. Alternatively, the designer can hard-code these values to best fit their application. The Advanced dialog also includes an ‘ ...

Page 7

... This problem is overcome in the TSL256x through the use of two photodiodes. One of the photodiodes (channel 0) is sensitive to both visible and infrared light, while the second photodiode (channel 1) is sensitive primarily to infrared light. An integrating ADC converts the photodiode The EVM software www.taosinc.com ...

Page 8

... Lux = 0.0157 X CH0 − 0.0180 X CH1 Lux = 0.00338 X CH0 − 0.00260 X CH1 Lux = 0 Lux = 0.0304 X CH0 − 0.062 X CH0 X ((CH1/CH0) Lux = 0.0224 X CH0 − 0.031 X CH1 Lux = 0.0128 X CH0 − 0.0153 X CH1 Lux = 0.00146 X CH0 − 0.00112 X CH1 Lux = 1.4 ) 1.4 ) www.taosinc.com ...

Page 9

... TSL2560/61 datasheet. This utility provides a knowledge of the low-level functionality of the TSL2560/61 device. Figure 5. TAOS TSL2560/61 Device Utility Dialog Graphical User Interface (GUI) The Main dialog of the Device Utility application displays the illuminance (lux), raw channel values, and relative position of the channel 0 value ...

Page 10

... Control Register (0h): Primarily used to power up/down the TSL2560/61 device 2. Timing Register (1h): Controls the integration time and gain of the ADC channels 3. Interrupt Control Register (6h): Controls the interrupt capabilities of the device 4. Interrupt Threshold Registers (2h-5h): Stores the high and low trigger points for the comparison function for interrupt generation www.taosinc.com ...

Page 11

... Figure 7. Device Utility Settings Dialog www.taosinc.com ...

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