TSL2583 datasheet(23/33 Pages) AMSCO

23 / 33 page

TSL2581, TSL2583

LIGHT-TO-DIGITAL CONVERTER

TAOS134A − JULY 2012

E 2012, TAOS Inc.

The LUMENOLOGY

r Company

www.taosinc.com

// 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 TSL2583. The equation if implemented

as a piece−wise linear approximation.

// Arguments: unsigned int iGain − gain, where 0:1X, 1:8X, 2:16X, 3:128X

unsigned int tIntCycles − INTEG_CYCLES defined in Timing Register

unsigned int ch0 − raw channel value from channel 0 of TSL2583

unsigned int ch1 − raw channel value from channel 1 of TSL2583

unsigned int iType − package type (1:CS)

// Return:

unsigned int − the approximate illuminance (lux)

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

unsigned int CalculateLux(unsigned int iGain, unsigned int tIntCycles, unsigned int ch0,

unsigned int ch1, int iType)

{

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

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

// 1X, 400ms is nominal setting

unsigned long chScale0;

unsigned long chScale1;

unsigned long channel1;

unsigned long channel0;

// No scaling if nominal integration (148 cycles or 400 ms) is used

if (tIntCycles == NOM_INTEG_CYCLE)

chScale0 = (1 << CH_SCALE);

else

chScale0 = (NOM_INTEG_CYCLE << CH_SCALE) / tIntCycles;

switch (iGain)

{

case 0: // 1x gain

chScale1 = chScale0;

// No scale.

Nominal setting

break;

case 1: // 8x gain

chScale0 = chScale0 >> 3;

// Scale/multiply value by 1/8

chScale1 = chScale0;

break;

case 2: // 16x gain

chScale0 = chScale0 >> 4;

// Scale/multiply value by 1/16

chScale1 = chScale0;

break;

case 3: // 128x gain

chScale1 = chScale0 / CH1GAIN128X; //Ch1 gain correction factor applied

chScale0 = chScale0 / CH0GAIN128X; //Ch0 gain correction factor applied

break;

}

// scale the channel values

channel0 = (ch0 * chScale0) >> CH_SCALE;

channel1 = (ch1 * chScale1) >> CH_SCALE;

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

// protect against divide by zero

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