TSL2568CS datasheet(40/56 Pages) OSRAM

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ams Datasheet

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[v1-00] 2016-Apr-12

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TSL2568, TSL2569 − Application Information: Software

#define M6C 0x0000

// 0.00000 * 2^LUX_SCALE

// lux equation approximation without floating point calculations

//////////////////////////////////////////////////////////////////////////////

// Routine: unsigned int CalculateLux (unsigned int ch0, unsigned int ch0, int iType)

// Description: Calculate the approximate illuminance (lux) given the raw

channel values of the TSL2568. The equation if implemented

as a piece−wise linear approximation.

// Arguments: unsigned int iGain − gain, where 0:1X, 1:16X

unsigned int tInt − integration time, where 0:13.7mS, 1:100mS, 2:402mS,

3:Manual

unsigned int ch0 − raw channel value from channel 0 of TSL2568

unsigned int ch1 − raw channel value from channel 1 of TSL2568

unsigned int iType − package type (0:T, 1:CS)

// Return: unsigned int − the approximate illuminance (lux)

//////////////////////////////////////////////////////////////////////////////

unsigned int CalculateLux (unsigned int iGain, unsigned int tInt, unsigned int ch0,

unsigned int ch1, int iType)

{

//−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

// first, scale the channel values depending on the gain and integration time

// 16X, 402mS is nominal.

// scale if integration time is NOT 402 msec

unsigned long chScale;

unsigned long channel1;

unsigned long channel0;

switch (tInt)

{

case 0:

// 13.7 msec

chScale = CHSCALE_TINT0;

break;

case 1:

// 101 msec

chScale = CHSCALE_TINT1;

break;

default:

// assume no scaling

chScale = (1 << CH_SCALE);

break;

}

// scale if gain is NOT 16X

if (!iGain) chScale = chScale << 4;

// scale 1X to 16X

// scale the channel values

channel0 = (ch0 * chScale) >> CH_SCALE;

channel1 = (ch1 * chScale) >> CH_SCALE;

//−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

// find the ratio of the channel values (Channel1/Channel0)

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