Controllers Ease EMI Qualification of Automotive Touchscreens

Three new maXTouch touchscreen controllers and optimization services are now available from Microchip Technology to address electromagnetic interference (EMI) and electromagnetic compatibility (EMC) challenges faced by developers of automotive touchscreens. The TD family of touch controllers features a new differential mutual signal acquisition method that significantly increases the Signal-to-Noise Ratio (SNR). This allows the use of very thick glass or plastic cover lenses and multi-finger thick gloved touch support up to the equivalence of 4.5 mm polymethyl methacrylate (PMMA).

The MXT1067TD, MXT1189TD and MXT1665TD devices add several variants that are cost optimized for nine- to 13-inch automotive touchscreens to Microchip’s portfolio and are complemented by the recently-introduced MXT449TD, MXT641TD, MXT2113TD and MXT2912TD devices supporting up to 20-inch touchscreens. Each device addresses aspects of the increasing demand for functional safety features and is designed in accordance with the Automotive SPICE Level 3 capability and ISO 26262 Automotive Safety Integrity Level (ASIL) B requirements.

All devices in the TD family feature a unique waveform shaping capability to optimize the performance of the touch controller’s radiated emissions through an EMI optimization tool. Working with product experts in Microchip’s worldwide application design centers, this tool allows developers to enter user-defined RF limits and tune the shape of the transmitted burst waveform used for the touch sensing acquisition.

Waveform shaping is achieved through firmware parameters derived from the tool and helps designers to position the fundamental burst frequency to work together with other in-vehicle applications, such as the remote keyless entry system. The resulting parameters are then simply added to the maXTouch configuration file, which customizes the touch controller performance to the individual customer design. This process can save the designer many hours, or even weeks, of expensive EMC test chamber time by eliminating experimentation with different configuration settings to achieve the desired EMI/EMC performance, says Microchip.

Development Tools

An evaluation kit is available for each of the parts in the new maXTouch touchscreen controller family. Kit numbers are ATEVK-MXT1067TDAT-A (I2C), ATEVK-MXT1189TDAT-A (I2C), ATEVK-MXT1189TDAT-C (SPI), ATEVK-MXT1665TDAT-A (I2C) and ATEVK-MXT1665TDAT-C (SPI). Each kit includes a Printed Circuit Board (PCB) with the maXTouch touchscreen controller, a touch sensor on a clear glass lens, the Flat Printed Circuit (FPC) to connect to the sensor, a bridge PCB to connect the kit to the host computer via USB, as well as cables, software and documentation. All parts are also compatible with maXTouch Studio, a full software development environment to support the evaluation of maXTouch touchscreen controllers.

The maXTouch EMI optimization service will be made available as part of the system support provided by one of Microchip’s worldwide application design centers.

The MXT1067TD, MXT1189TD and MXT1665TD devices are available now in sampling and volume quantities in TQFP128 (MXT1067TD only) and LQFP144 packages.

Microchip Technology | www.microchip.com

Infineon and TTTech Team Up for Automated Driving Solution

Infineon Technologies and TTTech Auto have released the second generation of their fully integrated automotive-grade safety solution for automated driving use cases. It is based on Infineon’s AURIX TC397XM microcontroller and TTTech Auto’s MotionWise safety software platform. It delivers full support and scalability for level 2+ solutions up to the advanced levels 4 and 5 of automated driving. It helps embedded systems developers achieve faster time-to-market, improved software integration and validation thus reducing overall cost.

The first generation of Infineon’s AURIX microcontroller and TTTech Auto’s safety software platform MotionWise are integral part of zFAS, Audi’s centerpiece for piloted driving, that premiered in the Audi A8. TTTech Auto optimized its series-proven product MotionWise for the new and even more powerful second generation of Infineon’s AURIX microcontroller called TC397XM. The MotionWise safety software platform and underlying hardware are powerful enough to match the requirements of up to level 5 automated driving functions.

Residing on an ASIL-D safety hardware, the second generation of the solution is optimized for safety-critical applications. It is offering an increased ISO 26262 ASIL-D computing performance capability, a richer set of peripherals and advanced security measures. MotionWise enables fail-operational performance, freedom from interference and safety by design with highest ASIL levels for the whole platform. Each application hosted by MotionWise will run encapsulated from its peers, resulting in a safe environment where applications with different safety and real-time requirements can coexist and interact. This allows for seamless integration of applications.

Both companies gained extensive experience through close collaboration with key automotive industry players in long-term series production projects. As a key-component in more than 25 car models with production start since 2017, the first generation of this solution creates valuable synergies for series production. Several customers have already evaluated the second generation of this software/hardware combination and decided to use it in their ADAS series production programs with start of production in 2019.

Infineon Technologies | www.infineon.com

TTTech Auto | www.tttech-auto.com

 

MCU/MPUs Target Next-Gen Electric and Autonomous Vehicles

NXP Semiconductors  has announced a new family of high-performance safe microprocessors to control vehicle dynamics in next-generation electric and autonomous vehicles. The new NXP S32S microprocessors will manage the systems that accelerate, brake and steer vehicles safely, whether under the direct control of a driver or an autonomous vehicle’s control.

NXP is addressing the needs of carmakers developing future autonomous and hybrid electric vehicles with newly available 800 MHz MCU/MPUs. The first of the new S32 product lines, the S32S microprocessor offers the highest performance ASIL D capability available today, according to NXP.
The NXP S32S processors use an array of the new Arm Cortex-R52 cores, which integrate the highest level of safety features of any Arm processor. The array offers four fully independent ASIL D capable processing paths to support parallel safe computing. In addition, the S32S architecture supports a new “fail availability” capability allowing the device to continue to operate after detecting and isolating a failure—a critical capability for future autonomous applications.

NXP has partnered with OpenSynergy to develop a fully featured, real-time hypervisor supporting the NXP S32S products. OpenSynergy’s COQOS Micro SDK is one of the first hypervisor platforms that takes advantage of the Arm Cortex-R52’s special hardware features. It enables the integration of multiple real-time operating systems onto microcontrollers requiring high levels of safety (up to ISO26262 ASIL D). Multiple vendor independent OS/stacks can also run on a single microcontroller. COQOS Micro SDK provides secure, safe and fast context switching ahead of today’s software-only solutions in traditional microcontrollers.

NXP Seimconductors | www.nxp.com