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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SFH7773 датащи(PDF) 2 Page - OSRAM GmbH |
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SFH7773 датащи(HTML) 2 Page - OSRAM GmbH |
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2 / 23 page  - spectral sensitivity to mimic the human eye (V-lambda) I 2C-Bus Interface - Slave Address 0111 000X - 100kHz / 400kHz and 3.4MHz mode - programmable operation modes (stand-by, triggered, free-running) - low current consumption (< 5μA) in stand-by mode - configurable interrupt output with programmable threshold levels for PS and ALS 4. Ambient Light Sensor Proximity PD Ambient Light PD IR LED ASIC VLED VDD INT SDA SCL 5 2 3 7 6 1 I2C Command Register Data Register Oscillator Signal Processing LED Driver Analog Amplifier Internal Power Supply GNDLED GNDDD CATH 4 8 Fig. 2: SFH 7773 functional block diagram. The ambient light sensor is intended to provide ambient light measurement, e.g. to control and adjust the display brightness. To support this functionality the SFH 7773 provides a convenient user interface. The ambient light sensor delivers output values in the range from 0 to 65535 (16 bit). Low output values correspond to a low illumination of the sensor, while high values indicate high illumination. The range of the ambient light sensor sensitivity can be set by the user and covers more than 4 ½ decades. Two threshold levels for the ambient light sensor can be set via the I2C- bus, a lower and an upper threshold. In the case of exceeding these thresholds an interrupt is generated automatically, allowing e.g. the microcontroller to act accordingly (see Sec. 8.3 for the relevant registers and settings). Pin No. Pin Label Description 1 VLED LED Supply Voltage 2 GNDLED Ground VLED - LED Driver 3 VDD Digital Supply Voltage 4 GNDDD Ground (Digital) 5 INT Interrupt Pin 6 SCL I2C-Bus Clock Line 7 SDA I2C-Bus Data Line 8 CATH Must not be Connected Tab. 1: Pin configuration of the SFH 7773 4.1 Spectral Sensitivity of the ALS The human eye’s wavelength range of significant sensitivity is between 400 nm and 700 nm with its peak at around 555 nm (often called V-lambda characteristic). The spectral sensitivity of the SFH 7773 aims to mimic the sensitivity of the human eye as close as possible and provides a real improvement compared to standard silicon- photodetectors (see Fig. 3). Fig. 4 compares the ALS count readings with different light sources and relates them to the human eye sensitivity (V-lambda), assuming the same illuminance value. Values are normalized to the standard light source A (2856 K). Due to the high IR and UV suppression the sensor shows only minor deviation compared to the perception of the human eye for different light sources. Please note that the use of coloured cover glasses might influence the accuracy, depending on the spectral transmission characteristics (visible plus infrared range) of the cover glasses. December 12, 2011 page 2 of 23 |
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