Electronic Control Units for Lighting Systems and Interior comfort

Tools for development and test of Electronic Control Units


Interior and
Exterior Lighting

Karosserie and

Interior Comfort

motor control, switchable glass
and other comfort functions


Body, Interior and
Lighting Systems

 Lighting Systems

  • LSM-2 Lighting Scenario Master
  • ALE-1 Ambient Lighting Engine
  • ALE-2 Ambient Lighting Engine
  • ALC Ambient Lighting Controller
  • ISELED Gateway

Interior and Exterior

We are offering a range of Automotive Lighting ECUs for all the tasks in a vehicle lighting network.

Orchestration of static and dynamic lighting effects is controlled by a Lighting Scenario Master. This Master functionality can be implemented with a dedicated ECU or via software application on a domain controller or our eBox.

Based on the concept of the lighting solution (e.g. lamp, lighted trim part, etc.) LED control and light sources can either be integrated on the same PCB (= Lighting Engine) or implemented as separate parts connected via Automotive connectors (= Lighting Controller with powerful LED driver channels or ISELED Gateway).

  • Orchestration of static and dynamic lighting effects controlled by Lighting Scenario Master
  • Lighting Nodes with integrated LED light sources (Lighting Engines)
  • Lighting Nodes with powerful LED channels to control external LED light sources

LSM-2 Lighting Scenario Master

Coordination of Lighting Nodes

The LSM-2 provides complex light scenarios for coherent lighting effects in the vehicle interior and transmits those via LIN or CAN to the respective Lighting Nodes.

Due to the high compute power and network bandwidth, the LSM-2 can control many Lighting nodes simultaneously.

One application of the LSM-2 is the orchestration of illumination effects in a Starlight Headliner for luxury series-production vehicles. Several lighting scenarios such as glittering stars, shooting stars, reading lights and interior lighting support have been implemented.

  • Coordinates the Nodes of a Lighting Network simultaneously
  • Pre-installed lighting scenarios
  • 2x HS-CAN, 1x LS-CAN, 1x LIN
  • AUTOSAR capable series control unit

ALE-1 Ambient Lighting Engine

Starlight Headliner

The ALE-1 offers two control modes for 192 LEDs. In the single mode, 192 LEDs can be individually controlled with a brightness resolution of 14 bits. In the group mode, the LEDs can be controlled in groups of 64 LEDs to save bandwidth on the CAN bus and processing power on the Master ECU. Also, in the group mode, different light effects and dynamic brightness distribution can be calculated. The control is possible via CAN-HS and CAN-LS.

An integrated gamma correction compensates the non-linear human perception.

To ensure smooth transitions, the brightness from the busses are interpolated at 100Hz.

  • LED module with a matrix of 192 LEDs
  • Individual and grouped control of LEDs via CAN-HS & CAN-LS
  • Compensation of non-linear human perception
  • 14-bit PWM control

ALE-2 Ambient Lighting Engine

Control of

The ALE-2 is a control unit with integrated RGB-LEDs which can be controlled with pre-installed and predefined lighting scenarios. In addition, simple control is possible by setting brightness- and RGB-values as well as the dimming time.

Gamma correction and temperature compensation ensure a regular dimming process and a constant color space.  To protect the module, the ALE-2 has short circuit detection, open load monitoring as well as parameterizable derating function.

Thanks to its compact size, the control unit can be installed in the vehicle in a space-saving manner, directly connected to the light guides. The ALE-2 is available in series with one or four RGB-LEDs. An adaptation is possible on customer request.

  • Control of integrated RGB LEDs via LIN
  • Pre-installed lighting scenarios and dimming function
  • Temperature compensation, short circuit and interruption monitoring, derating
  • Compact design – Suitable for ambient lighting systems
  • Available with 1 or 4 RGB-LEDs



Flexible LED control
via CAN or LIN

The ALC has been designed to control four LED channels with up to 120mA each, with a maximum output voltage of 24V. An increase to 350mA is possible by bundling adjacent LED channels.

The controller can be integrated into both a CAN and a LIN bus system. Each LED channel can be individually controlled by PWM or voltage dimming.

A built-in Boost-Buck converter provides a constant current output (at 0V-24V) for a dynamic input voltage range of (7V-18V). By means of pin coding, different application scenarios can be covered with the same hardware. A software update can be performed via CAN or LIN.

In addition to its function as a Lighting Controller, it can also serve as a Lighting Scenario Master and control other Lighting Controllers or ISELED Gateways.

  • Four controllable LED channels with up to 120mA
  • Interfaces: CAN, LIN Master, LIN Slave
  • Boost-Buck Converter
  • Processing of 6 digital, 4 analog inputs and one PWM signal


ISELED Gateway

Connecting ISELEDs to LIN or CAN

As a LIN or private CAN based communication interface, the ISELED Gateway controls ISELED lighting systems with up to 50 ISELEDs. Preinstalled lighting scenarios can be parameterized and executed.

The gateway can be installed as a separate control unit or due to its compact design, it can be integrated into the housing or circuit board of the lighting system.

It is currently available in prototypes and under development for series-production vehicle integration.

  • Preinstalled lighting scenarios
  • Available as LIN or CAN Version with 1x ISELED output
  • Wake-up and Parameter update via Bootloader and LIN/CAN
  • Available as a separate controller or integrated with the lighting system


Body and Interior Comfort

  • BDD Door Drive ECU
  • DHC Door Handle ECU
  • Sunblind ECU
  • LTC-1 Light Transmission ECU
  • Intercom Control Unit

motor control, switchable glass and
other comfort functions

iSYS RTS is offering a range of Automotive ECUs to control various comfort functions. Typically, these devices are implemented as LIN Slaves.

These LIN nodes are based on our proven software framework which comprises the RTOS, a bootloader and diagnostic functionality among other aspects.

In addition to those ECUs which are already in series production, LIN nodes for new projects can be developed rather quickly by building on existing hardware blocks and software frameworks. 

  • LIN Nodes based on our proven software framework iSiCORE
  • Hardware and Software library for typical device drivers
  • Various Applications for comfort and cargo functions

BDD Door Drive ECU

BLDC motor control via LIN

The bidirectional Door Drive ECU allows the control of a BLDC motor through Field-Oriented Control, for automatic or assisted manual movement of a door through gravity and friction compensation.

The triggering is done via LIN or the hall effect sensor at inner door handle. The current door position and door speed are calculated with the data of a high-resolution encoder in the motor and an acceleration sensor ECU by a kinematics model integrated into the ECU.

In addition to gravity compensation, the high precision door control system allows the simulation of mechanical haptic functions such as mechanical door latches via parameterizable profiles.

Implementation of LIN Master & CAN interface is possible on request.

  • Weightless door through gravity and friction compensation
  • Automatic and assisted movement of a door
  • Integrated field vector control for precise position control
  • LIN Master & CAN interface implementation possible


Automatic deployment and retraction of a door handle via LIN

The Door Handle ECU, with an integrated angle sensor, enables the control of a DC motor for automatic deployment and retraction of a door handle.

An electrical force-displacement profile is used to enable haptic feedback. Therefore, many mechanical components can be omitted. For example, the pressure point of a door handle can be emulated in software and the characteristics can be adjusted even in the field.

An integrated white LED provides functional lighting, which can be used for door handle lighting optionally.

  • Free parametric haptic feedback
  • Obstacle detection and error monitoring
  • Software update via UDS Bootloader
  • LIN-Slave control unit


Automatic deployment and retraction of a sunshade via LIN

The Sunblind ECU enables the control of a DC motor for automatic retraction and deployment of a sunshade. By using a speed-controlled activation, even non-linear rail guides can be moved at a constant speed.

The movement of the sunshade is measured by evaluation of two Hall sensors. The absolute position of the sunshade is referenced to the mechanical end stop, so no limit switches are necessary. An intelligent algorithm minimizes the number of contacts to the end stops. This is achieved by storing the current position across power cycles and estimating the reliability of the current reference.

Obstacle detection and error monitoring protect the system and the users.

  • Intelligent referencing
  • Obstacle detection and error monitoring
  • Software update via UDS based Bootloader
  • LIN-Slave control unit

LTC-1 Light Transmission ECU

Control of switchable glass

PDLC film based switchable glasses can be controlled by LTC-1 and switched from transparent to opaque.

By using a configurable voltage curve form, an optimal charge flow is ensured.

The LTC-1 is applied in a series-production vehicle to switch a separation wall between the front seat and the rear seat from normal (transparent) to privacy (opaque) mode.

Similarly, applications for rear and side windows or glass roofs can be implemented.

  • Control of PDLC-Films
  • Optimum charge flow thanks to configurable voltage curve shape
  • 1x LIN
  • 2x button inputs

Intercom Control Unit

LIN based Audio functionality

The Intercom Control Unit offers three microphone inputs, one power output for a speaker and one line output for connection to the multimedia console.

The system is activated by pressing a button. An LED status signal and a sound signal support the call enquiry and acceptance optically and acoustically.

The Intercom Control Unit features an echo cancellation mechanism that adapts dynamically to the acoustic environment. This prevents echoes – generated by feedback loops between microphones and speakers – and background noise.

  • Intercom controller with Echo cancellation
  • 3x microphone inputs, 1x speaker output, 1x AUX output
  • 1x LIN, 3x button inputs
  • Status signals via LED and prestored sounds

Domain Controller

  • eBox
  • Domain Controll Unit

Body, Interior and
Lighting Systems

The domain control unit coordinates several nodes of a vehicle domain. The domain controller takes over computationally intensive tasks based on the data of the various bus nodes.

Different communication protocols allow project-related, flexible communication with the actuators/sensors using standard software components.

The central coordination and calculation of the domain functionality makes it possible to create complex scenarios that can be experienced by the customer while simplifying the E/E architecture at the same time.

  • Realization of zone and add-on architecture
  • Integration of virtual ECUs
  • Replacement of HMI-devices


Automotive ECU

With a wide range of automotive interfaces and an integrated Yocto Linux operating system, the eBox provides a universal automotive platform. Typical applications include Domain Control or Lighting Scenario Master in series-production vehicles with low volume count.

It is also a perfect solution for the integration of new devices and applications into existing vehicle networks or for test setups.

The eBox can be controlled via LIN, CAN, Ethernet or the integrated WiFi Hotspot. Among other things, the eBox can be remotely controlled via a tablet or computer using a customer-specific application.

In addition to the powerful Linux operating system, the eBox offers a real-time operating system on a separate microcontroller.

  • Customizable controller with WiFi Hotspot
  • Yocto Linux operating system, with 8GB Flash & 256 MB RAM
  • Interfaces: 3xCAN, 1x LIN, 1x OABR, 8x analog Input, 4x digital I/Os
  • Real-time operating system
  • Extendible I/O interface

Domain Control Unit

Connecting standard board net with private network for special functions

The Domain Control Unit acts as a gateway to connect a private network for special functions to the standard vehicle electrical system via a robust and secure interface.

The use of two virtual ECUs, both based on AUTOSAR, results in a strict separation of base functionality and connectivity from additional applications.

This allows functions for special purpose cars (e.g. security vehicles, police cars, other derivatives, small volume series) to be introduced with minimal validation effort after SOP of the base vehicle.

Communication with the vehicle network is based on Ethernet or CAN. The special functions can be controlled either via CAN, LIN, PWM or Ethernet. In addition, High-side and Low-side power outputs as well as wake-up and diagnosable inputs for sensors and push buttons are available.

  • Connects board communication system with special functions via Ethernet or CAN
  • Controls special function directly with 250mA or 1A outputs
  • 48 low power and 16 medium power outputs
  • Communication via LIN, CAN, Ethernet
  • Digital and analog inputs, evaluation of PWM signals


  • ISELED Test Tool
  • OABR Tool

Tools for ISELED and OABR

For laboratory, development and production, two in-house developed hand test tools for the ISELED and OABR technologies are available for testing, control and stimulation.

ISELED and OABR systems can be operated by buttons directly or remotely via standard interfaces. Automation can be done via web server with HTTP GUI or Python-API.

A wide range of system-specific interfaces and functions allow more complex scenarios to be integrated. In addition, the hardware architecture allows the implementation of further standard interfaces on request.

  • Tools for laboratory, development and production
  • Direct and remote operation
  • Programmable via HTTP GUI or Python API

ISELED Test Tool

Controlling ISELED based lighting systems

The ISELED Test Tool enables the immediate control and operation of ISELED based lighting systems without a complex test setup. Up to four ISELED channels can be controlled simultaneously with currently four different, predefined parameterizable light scenarios.

By pressing a button, the user can set a RGB color value and brightness level to each ISELED. For creating more complex light scenarios, the Test Tool features an USB interface, which enables automated control of the connected ISELEDs via a Python API.

In addition, a graphical desktop application allows to configure individual lighting scenarios with up to 10 adjustable lighting effects.

The test tool has further interfaces such as CAN, LIN, Micro-SD and 4 analog and 2 digital inputs, which can be implemented on request.

  • Applicable for light design, automated test procedures and series validation of ISELED based lighting systems
  • Preinstalled and parameterizable light scenarios
  • Parameters will be stored in non-volatile memory
  • Control of up to 110 ISELEDs per channel (4 channels)


Programmable Automotive Ethernet Controller / Adapter

For development and test applications the OABR Tool provides control to Automotive Ethernet (100Base-T1) capable devices in stand-alone operation via 6 programmable buttons or via a PC connected to the additional RJ-45 Ethernet (100Base-TX) port.

The tool applies a Linux operating system with integrated web server, which provides a graphical user interface for configuration. With this HTTP GUI customized Ethernet message sequences can be defined and assigned to the buttons.

Thanks to more advanced Ethernet features, like VLAN tagging and Bridging, the OABR Tool can be integrated into almost any production and development network.

Specifically for use in automotive networks, the tool is able to control a wake-up line and has the capability to offer simple SOME/IP services to other participants.

  • Embedded Yocto Linux System with integrated Graphical User Interface
  • 6 programmable buttons (UDP, TCP, SOME/IP)
  • Supports Wake-up Line
  • Use cases: bus simulation, automatic test systems, tracing, etc.


In case of any questions regarding our services and products, please get in touch with Alexander Schwindt either via phone at 089 442 30 68 – 11 or via mail at