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Technical content
Features
Sigma Delta Scale® principle for optical sensors
Applications
Typical Application Circuit Front end optical rain sensor signal processor Four input channels for ambient light measurements High sensitivity, no total reflection needed Very high robustness against ambient influences like sun light, aging and dirt Two embedded LED drivers, driving up to 40mA Provides a rain drop signal via the WS pin SPI interface Integrated temperature sensor Extensive diagnosis during operation Low bill of materials due to few external components AEC-Q100 qualification Optical rain sensing to control automotive wiping systems or industrial camera and window systems Ambient light measurements to control - Headlights / lights - Head-up displays - Air conditioning Very high robustness against ambient influences such as sun light, aging and dirt Compensating of aging and temperature effects General Description The RLT IC (Rain Light Tunnel Sensor) is intended for control- ling an optical sensor unit in automotive wiping systems or in industrial camera and window systems. It provides two em - bedded slew rate controlled LED drivers with up to 40mA cur- rent for stimuli generation. A special, high-sensitive receiver allows processing of a diode input signal without total reflec- tion of the send signal, allowing reliable detection of rain and water drops. Due to the used HALIOS-SD (Sigma Delta) meas- urement method a very high robustness against ambient in- fluences like sun light, any kind of flickering light, aging and dirt is provided. The device has four additional input channels for ambient light measurements. Communication is provided using a 3- or 4-wire SPI interface for fast and flexible com - munication.
Ordering Information
Ordering-No.: Temp Range Package E52704A52C -40°C to +105°C QFN20L4 HALIOS® Control Voltage References SPI E527.04 Log ALS0 Ambient Light Window Shield RS VREF LEDA LED supply 3.3V supply LED supply LEDB GNDL ALS1 ALS2 ALS3 MUX ADC VDDD VDDA GNDA GNDD MISO WS MOSI SCK CSB
Note: Elmos Semiconductor AG (below Elmos) reserves the right to make changes to the product contained in this publication without notice. Elmos assumes no responsibility for the use of any circuits described herein, conveys no licence under any patent or other right, and makes no representation that the circuits are free of patent infringement. While the information in this publication has been checked, no responsibility, however, is assumed for inaccuracies. Elmos does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of a life-support system or to signifi cantly affect its safety or effectiveness. Products are not authorized for use in such applications. Copyright © 2016 Elmos Reproduction, in part or whole, without the prior written consent of Elmos, is prohibited. Headquarters Elmos Semiconductor AG Heinrich-Hertz-Str. 1
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