TSL2581CS TAOS, TSL2581CS Datasheet - Page 24

• Manufacturer Part Number: TSL2581CS
• Description: Light to Digital Converters Light to Digital 30x Sensitivity
• Manufacturer: TAOS

Specifications of TSL2581CS

• Data Bus Width: 16 bit
• Peak Wavelength: 625 nm, 850 nm
• Maximum Operating Frequency: 795 KHz
• Operating Supply Voltage: 2.7 V to 3.6 V
• Operating Current: 175 uA
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: - 30 C
• Interface Type: I2C
• Maximum Fall Time: 300 ns
• Maximum Rise Time: 300 ns
• Mounting Style: SMD/SMT
• Resolution: 16 bit
• Package / Case: DFN-6
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

TSL2580, TSL2581
LIGHT-TO-DIGITAL CONVERTER
TAOS098 − MARCH 2010
//////////////////////////////////////////////////////////////////////////////
unsigned int CalculateLux(unsigned int iGain, unsigned int tIntCycles, unsigned int ch0,
unsigned int ch1, int iType)
{
// No scaling if nominal integration (148 cycles or 400 ms) is used
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Copyright E 2010, TAOS Inc.
//−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
// 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;
if (tIntCycles == NOM_INTEG_CYCLE)
else
switch (iGain)
{
}
// 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)
{
chScale0 = (1 << CH_SCALE);
chScale0 = (NOM_INTEG_CYCLE << CH_SCALE) / tIntCycles;
case 0: // 1x gain
case 1: // 8x gain
case 2: // 16x gain
case 3: // 128x gain
case 1: // FN package
chScale1 = chScale0;
break;
chScale0 = chScale0 >> 3;
chScale1 = chScale0;
break;
chScale0 = chScale0 >> 4;
chScale1 = chScale0;
break;
chScale1 = chScale0 / CH1GAIN128X; //Ch1 gain correction factor applied
chScale0 = chScale0 / CH0GAIN128X; //Ch0 gain correction factor applied
break;
if ((ratio >= 0) && (ratio <= K1C))
else if (ratio <= K2C)
else if (ratio <= K3C)
{b=B1C; m=M1C;}
{b=B2C; m=M2C;}
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// No scale.
// Scale/multiply value by 1/8
// Scale/multiply value by 1/16
Nominal setting
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