TSL2569T TAOS, TSL2569T Datasheet - Page 24

• Manufacturer Part Number: TSL2569T
• Description: Light to Digital Converters Light to Digital Sensor
• Manufacturer: TAOS

Specifications of TSL2569T

• Data Bus Width: 20 bit
• Peak Wavelength: 640 nm, 940 nm
• Maximum Operating Frequency: 780 KHz
• Operating Supply Voltage: 2.7 V to 3.6 V
• Operating Current: 0.6 mA to 15 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: TMB-6
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

TSL2568, TSL2569
LIGHT-TO-DIGITAL CONVERTER
TAOS091D − DECEMBER 2008
// 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
//
//
//
// Arguments: unsigned int iGain − gain, where 0:1X, 1:16X
//
//
//
//
//
//
// Return:
//
//////////////////////////////////////////////////////////////////////////////
unsigned int CalculateLux(unsigned int iGain, unsigned int tInt, unsigned int ch0,
unsigned int ch1, int iType)
{
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Copyright E 2008, TAOS Inc.
//−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
// 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)
{
}
// scale if gain is NOT 16X
if (!iGain) chScale = chScale << 4;
// scale the channel values
channel0 = (ch0 * chScale) >> CH_SCALE;
channel1 = (ch1 * chScale) >> 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;
unsigned int − the approximate illuminance (lux)
case 0:
case 1:
default:
channel values of the TSL2568. The equation if implemented
as a piece−wise linear approximation.
unsigned int tInt − integration time, where 0:13.7mS, 1:100mS, 2:402mS,
unsigned int ch0 − raw channel value from channel 0 of TSL2568
unsigned int ch1 − raw channel value from channel 1 of TSL2568
unsigned int iType − package type (0:T, 1:CS)
chScale = CHSCALE_TINT0;
break;
chScale = CHSCALE_TINT1;
break;
chScale = (1 << CH_SCALE);
break;
3:Manual
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// 13.7 msec
// 101 msec
// assume no scaling
// scale 1X to 16X
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