TSL2580FN datasheet(38/53 Pages) OSRAM

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ams Datasheet

Page 37

[v1-00] 2016-Apr-05

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TSL2580, TSL2581 − Application Information: Software

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

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 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;}

break;

}

unsigned long temp;

unsigned long lux;

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

// round lsb (2^(LUX_SCALE-1))

temp += (1 << (LUX_SCALE-1));

// strip off fractional portion

lux = temp >> LUX_SCALE;

return(lux);

}

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