TSL2563CS datasheet(25/38 Pages) TAOS

25 / 38 page

TSL2562, TSL2563

LOW-VOLTAGE

LIGHT-TO-DIGITAL CONVERTER

TAOS066J − MAY 2007

The LUMENOLOGY r Company

www.taosinc.com

#define K4C

0x010a // 0.520 * 2^RATIO_SCALE

#define B4C

0x0282 // 0.0392 * 2^LUX_SCALE

#define M4C

0x03df // 0.0605 * 2^LUX_SCALE

#define K5C

0x014d // 0.65 * 2^RATIO_SCALE

#define B5C

0x0177 // 0.0229 * 2^LUX_SCALE

#define M5C

0x01dd // 0.0291 * 2^LUX_SCALE

#define K6C

0x019a // 0.80 * 2^RATIO_SCALE

#define B6C

0x0101 // 0.0157 * 2^LUX_SCALE

#define M6C

0x0127 // 0.0180 * 2^LUX_SCALE

#define K7C

0x029a // 1.3 * 2^RATIO_SCALE

#define B7C

0x0037 // 0.00338 * 2^LUX_SCALE

#define M7C

0x002b // 0.00260 * 2^LUX_SCALE

#define K8C

0x029a // 1.3 * 2^RATIO_SCALE

#define B8C

0x0000 // 0.000 * 2^LUX_SCALE

#define M8C

0x0000 // 0.000 * 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 TSL2562. 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 TSL2562

unsigned int ch1 − raw channel value from channel 1 of TSL2562

unsigned int iType − package type (T or 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);

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