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TSL2560 Fiches technique(PDF) 5 Page - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS |
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TSL2560 Fiches technique(HTML) 5 Page - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS |
5 / 38 page TSL2560, TSL2561 LIGHT-TO-DIGITAL CONVERTER TAOS059K − APRIL 2007 5 The LUMENOLOGY r Company r r Copyright E 2007, TAOS Inc. www.taosinc.com NOTES: 2. Optical measurements are made using small-angle incident radiation from light-emitting diode optical sources. Visible 640 nm LEDs and infrared 940 nm LEDs are used for final product testing for compatibility with high-volume production. 3. The 640 nm irradiance Ee is supplied by an AlInGaP light-emitting diode with the following characteristics: peak wavelength λp = 640 nm and spectral halfwidth Δλ ½ = 17 nm. 4. The 940 nm irradiance Ee is supplied by a GaAs light-emitting diode with the following characteristics: peak wavelength λp = 940 nm and spectral halfwidth Δλ ½ = 40 nm. 5. Integration time Tint, is dependent on internal oscillator frequency (fosc) and on the integration field value in the timing register as described in the Register Set section. For nominal fosc = 735 kHz, nominal Tint = (number of clock cycles)/fosc. Field value 00: Tint = (11 × 918)/fosc = 13.7 ms Field value 01: Tint = (81 × 918)/fosc = 101 ms Field value 10: Tint = (322 × 918)/fosc = 402 ms Scaling between integration times vary proportionally as follows: 11/322 = 0.034 (field value 00), 81/322 = 0.252 (field value 01), and 322/322 = 1 (field value 10). 6. Full scale ADC count value is limited by the fact that there is a maximum of one count per two oscillator frequency periods and also by a 2-count offset. Full scale ADC count value = ((number of clock cycles)/2 − 2) Field value 00: Full scale ADC count value = ((11 × 918)/2 − 2) = 5047 Field value 01: Full scale ADC count value = ((81 × 918)/2 − 2) = 37177 Field value 10: Full scale ADC count value = 65535, which is limited by 16 bit register. This full scale ADC count value is reached for 131074 clock cycles, which occurs for Tint = 178 ms for nominal fosc = 735 kHz. 7. Low gain mode has 16 y lower gain than high gain mode: (1/16 = 0.0625). 8. The sensor Lux is calculated using the empirical formula shown on p. 22 of this data sheet based on measured Ch0 and Ch1 ADC count values for the light source specified. Actual Lux is obtained with a commercial luxmeter. The range of the (sensor Lux) / (actual Lux) ratio is estimated based on the variation of the 640 nm and 940 nm optical parameters. Devices are not 100% tested with fluorescent or incandescent light sources. |
Numéro de pièce similaire - TSL2560 |
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Description similaire - TSL2560 |
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