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SFH7773 Datasheet(PDF) 5 Page - OSRAM GmbH |
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SFH7773 Datasheet(HTML) 5 Page - OSRAM GmbH |
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5 / 23 page  December 12, 2011 page 5 of 23 As a rule of thumb, 30 counts result in almost a quadrupling in irradiance (PS signal level) whereas 10 counts represent roughly a factor of 1.55 in analog signal level. The digital proximity count signal is correlated to the detected irradiance Ee. There is an approximate logarithmic relationship between the digital PS signal the analog signal level (irradiance): 2 1 4 . 370 11 . 0 017 . 0 10 cm W E burst t s counts e μ ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ ≈ ⋅ − + ⋅ Eq. (1) The sensor’s design ensures that a touch of human skin directly onto the sensor (no airgap) delivers the maximum sensor count (which depends on LED drive current and integration time). This ensures that even in this rare case a reliable operation is ensured. 5.3 Radiation Characteristics of the PS- LED Fig. 10 presents the radiation characteristics of the IR-LED. The characteristics might influence the design of the cover glass (aperture). The directional sensitivity of the proximity sensor photodiode (detector) is very similar to the emitter’s radiation characteristics. Please refer to Sec. 10.1 for a more detailed discussion. 5.4 Crosstalk In general, most proximity sensors are hidden behind a cover glass. However, the cover glass causes reflections which might make it impossible for the sensor to differentiate between a target reflection (e.g. human skin) and the reflections from the 0 25 50 75 100 125 150 50 100 150 200 Proximity Count vs. Target Distance Kodak White, 90 %, 100 x 100 mm 2 Target Distance / mm 300 us 750 us 1000 us 1500 us Fig. 9: Proximity sensor signal count vs. target distance and integration time (LED drive current = 200 mA). -90 -60 -30 0 30 60 90 0 50 100 + - - ± 30° Angle / ° Short Axis Long Axis ± 50° LED Radiation Characteristics of the IR-LED + Fig. 10: Radiation characteristics of the proximity sensor LED. 0 25 50 75 100 125 150 50 100 150 200 Target Distance / mm 200 mA 100 mA 50 mA Proximity Count vs. Target Distance Kodak White, 90 %, 100 x 100 mm 2 Fig. 8: Proximity sensor signal count vs. target distance and LED drive current (integration time tburst = 750 us). |
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