TSL2568CS datasheet(41/56 Pages) OSRAM

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Page 40

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[v1-00] 2016-Apr-12

TSL2568, TSL2569 − Application Information: Software

// protect against divide by zero

unsigned long ratio1 = 0;

if (channel0 != 0) ratio1 = (channel1 << (RATIO_SCALE+1)) / channel0;

// round the ratio value

unsigned long ratio = (ratio1 + 1) >> 1;

// is ratio <= eachBreak ?

unsigned int b, m;

switch (iType)

{

case 0:

// T package

if ((ratio >= 0) && (ratio <= K1T))

{b=B1T; m=M1T;}

else if (ratio <= K2T)

{b=B2T; m=M2T;}

else if (ratio <= K3T)

{b=B3T; m=M3T;}

else if (ratio <= K4T)

{b=B4T; m=M4T;}

else if (ratio <= K5T)

{b=B5T; m=M5T;}

else if (ratio > K6T)

{b=B6T; m=M6T;}

break;

case 1:

// CS package

if ((ratio >= 0) && (ratio <= K1C))

{b=B1C; m=M1C;}

else if (ratio <= K2C)

{b=B2C; m=M2C;}

else if (ratio <= K3C)

{b=B3C; m=M3C;}

else if (ratio <= K4C)

{b=B4C; m=M4C;}

else if (ratio <= K5C)

{b=B5C; m=M5C;}

else if (ratio > K6C)

{b=B6C; m=M6C;}

break;

}

unsigned long temp;

unsigned long lux;

temp = ((channel0 * b) − (channel1 * m));

// scale CS or T package

// round lsb (2^(LUX_SCALE−1))

temp += (1 << (LUX_SCALE−1));

// strip off fractional portion

lux = temp >> LUX_SCALE;

return(lux);

}

TSL2568CS 数据表(PDF) 41 Page - OSRAM GmbH

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