TSL2568CS datasheet(36/56 Pages) OSRAM

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ams Datasheet

Page 35

[v1-00] 2016-Apr-12

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TSL2568, TSL2569 − Application Information: Software

In order to generate an interrupt on demand during system test

or debug, a test mode (INTR = 11) can be used. The following

example illustrates how to generate an interrupt on demand:

// Generate an interrupt

Address = 0x39

//Slave addr also 0x29 or 0x49

Command = 0x86

//Address Interrupt register

Data = 0x30

//Test interrupt

WriteByte (Address, Command, Data)

//Interrupt line should now be low

Calculating Lux

The TSL256x is intended for use in ambient light detection

applications such as display backlight control, where

adjustments are made to display brightness or contrast based

on the brightness of the ambient light, as perceived by the

human eye. Conventional silicon detectors respond strongly to

infrared light, which the human eye does not see. This can lead

to significant error when the infrared content of the ambient

light is high, such as with incandescent lighting, due to the

difference between the silicon detector response and the

brightness perceived by the human eye.

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 currents to digital

outputs. Channel 1 digital output is used to compensate for the

effect of the infrared component of light on the channel 0

digital output. The ADC digital outputs from the two channels

are used in a formula to obtain a value that approximates the

human eye response in the commonly used Illuminance unit of

Lux:

Chipscale Package

For 0 < CH1/CH0

≤ 0.35

Lux = 0.00713 × CH0 - 0.00975 × CH1

For 0.35 < CH1/CH0

≤ 0.45

Lux = 0.00813 × CH0 - 0.01250 × CH1

For 0.45 < CH1/CH0

≤ 0.52

Lux = 0.00935 × CH0 - 0.01521 × CH1

For 0.52 < CH1/CH0

≤ 0.67

Lux = 0.00394 × CH0 - 0.00482 × CH1

For 0.67 < CH1/CH0

≤ 0.85

Lux = 0.00337 × CH0 - 0.00396 × CH1

For CH1/CH0 > 0.85

Lux = 0

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