TSL2569 datasheet(23/37 Pages) AMSCO

23 / 37 page

TSL2568, TSL2569

LIGHT-TO-DIGITAL CONVERTER

TAOS091D − DECEMBER 2008

E 2008, TAOS Inc.

The LUMENOLOGY

r Company

www.taosinc.com

//****************************************************************************

// THIS CODE AND INFORMATION IS PROVIDED ”AS IS” WITHOUT WARRANTY OF ANY

// KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE

// IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR

// PURPOSE.

// Module Name:

// lux.cpp

//****************************************************************************

#define LUX_SCALE 16

// scale by 2^16

#define RATIO_SCALE 9

// scale ratio by 2^9

//−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

// Integration time scaling factors

//−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

#define CH_SCALE 10

// scale channel values by 2^10

#define CHSCALE_TINT0 0x7517

// 322/11 * 2^CH_SCALE

#define CHSCALE_TINT1 0x0fe7

// 322/81 * 2^CH_SCALE

//−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

// T Package coefficients

//−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

// For Ch1/Ch0=0.00 to 0.35:

Lux=0.00763*Ch0−0.01031*Ch1

// For Ch1/Ch0=0.35 to 0.50:

Lux=0.00817*Ch0−0.01188*Ch1

// For Ch1/Ch0=0.50 to 0.60:

Lux=0.00723*Ch0−0.01000*Ch1

// For Ch1/Ch0=0.60 to 0.72:

Lux=0.00573*Ch0−0.00750*Ch1

// For Ch1/Ch0=0.72 to 0.85:

Lux=0.00216*Ch0−0.00254*Ch1

// For Ch1/Ch0>0.85:

Lux/Ch0=0

//−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

#define K1T 0x00b3

// 0.35 * 2^RATIO_SCALE

#define B1T 0x01f4

// 0.00763 * 2^LUX_SCALE

#define M1T 0x02a4

// 0.01031 * 2^LUX_SCALE

#define K2T 0x0100

// 0.50 * 2^RATIO_SCALE

#define B2T 0x0217

// 0.00817 * 2^LUX_SCALE

#define M2T 0x030a

// 0.01188 * 2^LUX_SCALE

#define K3T 0x0133

// 0.60 * 2^RATIO_SCALE

#define B3T 0x01da

// 0.00723 * 2^LUX_SCALE

#define M3T 0x028f

// 0.01000 * 2^LUX_SCALE

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