TSL2568CS datasheet(37/56 Pages) OSRAM

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ams Datasheet

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[v1-00] 2016-Apr-12

TSL2568, TSL2569 − Application Information: Software

TMB Package

For 0 < CH1/CH0

≤ 0.35

Lux = 0.00763 × CH0 - 0.01031 × CH1

For 0.35 < CH1/CH0

≤ 0.50

Lux = 0.00817 × CH0 - 0.01188 × CH1

For 0.50 < CH1/CH0

≤ 0.60

Lux = 0.00723 × CH0 - 0.01000 × CH1

For 0.60 < CH1/CH0

≤ 0.72

Lux = 0.00573 × CH0 - 0.00750 × CH1

For 0.72 < CH1/CH0

≤ 0.85

Lux = 0.00216 × CH0 - 0.00254 × CH1

For CH1/CH0 > 0.85

Lux = 0

The formulas shown above were obtained by optical testing

with fluorescent and incandescent light sources, and apply only

to open-air applications. Optical apertures (e.g. light pipes) will

affect the incident light on the device.

Simplified Lux Calculation

Below is the argument and return value including source code

(shown on following page) for calculating lux. The source code

is intended for embedded and/or microcontroller applications.

Two individual code sets are provided, one for the chipscale

package and one for the TMB package. All floating point

arithmetic operations have been eliminated since embedded

controllers and microcontrollers generally do not support these

types of operations. Since floating point has been removed,

scaling must be performed prior to calculating illuminance if

the integration time is not 402ms and/or if the gain is not 16×

as denoted in the source code on the following pages. This

sequence scales first to mitigate rounding errors induced by

decimal math.

extern unsigned int CalculateLux(unsigned int iGain, unsigned int tInt, unsigned int ch0, unsigned int ch1, int iType)

//****************************************************************************

// Copyright ams AG

// THIS CODE AND INFORMATION IS PROVIDED ”AS IS” WITHOUT WARRANTY OF ANY

// KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE

// IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR

// PURPOSE.

Module Name:

lux.cpp

//****************************************************************************

#define LUX_SCALE 16

//scale by 2^16

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