Use Case


Touchless control on screens with HALIOS® Sensor Interface ICs


Scalable non-contact control with high detection rate - even when disturbed by ambient light, temperature and ageing

Elmos Expertise in Optical Sensor Interface ICs


  • DC current cancellation
  • High light suppression via HALIOS® technology
  • Lowest system latency
  • Fine-adjustable via configuration


  • Automotive qualified (AEC-Q100) with proven track record over vehicle lifetime
  • Highest robustness in automotive environment over vehicle lifetime
  • Best-in-class ambient light immunity due to HALIOS® technology
  • Long time stability due to compensation of LED or PD ageing
  • Adjustable to high optical basic coupling


  • Adaptable sensor system detection range
  • Self-calibration makes the sensor solution scalable for different integration situations (e.g. different covers)
  • Sensitivity adjustment via configuration

Our Solution

About – E909.21 and E909.22 HALIOS® Sensor Interface IC

The infrared-based HALIOS® Sensor ICs provides the highest sensitivity and robustness in detecting fast hand movements for enhanced non-contact control. The solution is immune against ambient light enabling robust sensor design and scalable via E909.22.

Advantages / USPs

  • Best in class sunlight rejection
  • Sensor interface with lowest latency
  • Configurable sensitivity
  • Scalability of the detection area via multiple ICs chain (up to seven E909.22 addressable)
  • Sensor robustness (no activation of the system due to e.g. temperature drift, ageing drift and changes in optics)
  • Automatic compensation of changes in the environment

Comparison of E909.23 vs. competitor’s approach

Elmos: HALIOS® Differential Measurement

Competitor: Absolute Measurement

+ High sensitivity even with high optical cross talk
+ Very high robustness against flickering light and high ambient light
+ Reduced software support due to easy implementation of calibrations procedures
+ Good sensitivity without cover
– Needs high resolution of the PD signal
– Needs good temperature drift and offset compensation
– Needs additional component for integration
– Needs additional control unit for multiple sensor chain


Our Solution - System Constellation

Simple System

9” Sensor bar

  • System cost (only one E909.21)
  • 200 mm wide detection area
  • Up to 150 mm detection range
  • Proximity
  • Horizontal Swipe
  • AirSlider™

Performance System

13” Sensor bar

  • 300 mm wide detection area
  • Up to 150 mm detection range
  • Proximity
  • Horizontal Swipe
  • AirSlider™

High End System

15” Sensor bar

  • 400 mm wide detection area
  • Up to 150 mm detection range
  • Proximity
  • Horizontal Swipe
  • AirSlider™

9” Screen control

  • 1 x E909.21
  • 4 x LED + 2 X C-LED
  • 2 x Photodiode

13” Screen control

  • 1 x E909.21 + 1 x E909.22
  • 6 x LEDs + 3X C-LED
  • 3 x Photodiode

15” Screen control

  • 1 x E909.21 + 1 x E909.22
  • 8 x LEDs + 4 x C-LED
  • 4 x Photodiode


How much board space does the sensor require?

The area required for the sensors on the board is 10 x screen width mm².

How are the LEDs and photodiodes arranged?

The LEDs and photodiodes are arranged in a row. The row consists of so-called HALIOS® cells. Each HALIOS cell includes two LEDs, a photodiode and a compensator. The sequence is LED--PD-C-LED—LED.

How big should the distance between LEDs and photodiode be?

We recommend a distance of 34 mm between LEDs and photodiodes. The distance can be varied by +/- 3mm to match the sensor length to detection area.

What should the distance between the HALIOS® cells be?

The distance between the cells should be the same as between the LED and the photodiode in the cell.

What requirements should the sensor cover fulfil?

The transmittance of the sensor cover should be at least 80% at 940nm. The thickness of the cover should be less than 4 mm and the air gap between sensor and cover less than 3 mm.

What is the impact of the cover on the function of the sensor if it does not meet the minimum requirements?

A spot sensor can also be operated with the covers that do not meet the minimum requirements, but a reduction in sensor range must be expected.

Does the pollution of the cover have an impact on the functioning of the sensor?

The usual pollution such as fingerprints are automatically calibrated out and have no influence on the functionality of the sensor.