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AN521 Datasheet(PDF) 5 Page - Silicon Laboratories |
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AN521 Datasheet(HTML) 5 Page - Silicon Laboratories |
5 / 26 page AN521 Rev. 0.1 5 In general, for most hand-held applications, 8 uW/cm2 is a good minimum irradiance target to use for choosing an irLED. This allows operation under typical indoor lighting conditions and allows operation outdoors. For the rest of this document, 8 uW/cm2 is assumed in all calculations. Choosing a higher Ee value at the sensor would lead to an irLED with a higher radiant intensity, leading to trade-offs on radiation pattern or irLED cost. 16 uW/cm2 Yes Large 25.6 s Artificial Lighting CFL < 4 klx; Incandescent < 1.8 klx 32 uW/cm2 Yes Large 25.6 s Artificial Lighting CFL < 8 klx; Incandescent < 3.6 klx 58 uW/cm2 Yes Large 25.6 s Artificial Lighting CFL < 14.5 klx; Incandescent < 6.5 klx 7 uW/cm2 Yes Large 25.6 s Indirect Sunlight < 16 klx 22 uW/cm2 Yes Small 51.2 s Direct Sunlight < 80 klx 45 uW/cm2 Yes Small 25.6 s Direct Sunlight < 190klx Table 1. Typical Ee Design Targets (Continued) Ee (sensor) Minimum HSIG Bit IR Photo Diode ADC Integration Time Usage (no overlay assumed) |
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