Following the trend of human-computer interaction, using dual-mode 3D touch solutions to help make cars more intelligent
The core direction is towards the future. The 4th Hard Core China Chip Leaders Summit and the 2022 Automotive Chip Technology Innovation and Application Forum hosted by Chip Master successfully concluded on November 15. Zhu Jianru, Marketing VP of Shanghai Taisi Microelectronics Co., Ltd. (hereinafter referred to as "Taisi Micro"), delivered a keynote speech at the summit - "Prospects for Human-Computer Interaction in Intelligent Cars".
Shanghai Taisi Microelectronics Co., Ltd. was established in Zhangjiang, Shanghai in 2019. It is a leading high-performance dedicated MCU chip supplier in China. The company focuses on the research and development of various chips related to Internet of Things applications. It has received strong support and investment from many well-known investment institutions, and has accumulated a large number of MCU chip solutions in signal chain, power supply and radio frequency, covering consumer, Industrial control and automotive application fields.
The following full text has been compiled and edited based on the transcript of Zhu Jianru’s speech without changing the original meaning.
TaiSi Micro Marketing VP Zhu Jianru’s live speech video
Video source: Master Xin
As automotive intelligence becomes the mainstream development direction of the industry, various human-computer interaction application scenarios in automobiles are increasing, and the concepts of smart touch and smart surface are also emerging in automotive applications. Pure capacitive touch technology is widely used in automotive interior and exterior applications to replace traditional mechanical buttons, which to a certain extent improves the human-computer interaction experience and sense of technology in automobiles.
From the input and output ends , the current automotive human-computer interaction covers physical buttons, touch screens, voice, images (such as faces, gestures and driver monitoring systems), biometrics, mobile phones and other functional modules, and ultimately lighting , display, vibration, AR and other forms of display.
Picture: PPT screenshot of Zhu Jianru’s speech
"In the future, human-computer interaction will focus on five major trends: multi-modal fusion, multi-interface interaction and smart surfaces, multi-position interaction between front and rear cabin passengers, personalization and humanization, and in-car and out-of-car interaction." TaiSi Micro Marketing VP Zhu Jianru said in his speech that under this trend, smart surfaces and smart touch will become rigid requirements for the development of smart cars.
From the perspective of smart car structural requirements, the intelligent cockpit has made the application of multi-screen and through-screen more and more widespread. The traditional physical buttons on the center console do not have enough space to arrange, and more button functions need to be integrated into the limited area. In terms of usage habits, the usage habits developed by users on mobile phones and other mobile devices are naturally migrating to cockpit and driving scenarios.
In terms of aesthetics and technological sense, clumsy mechanical buttons are required to be gradually eliminated, and the shape and structural design of the surface of smart buttons will be more flexible. At the same time, combined with interactive technologies such as ambient lighting, sound, and vibration, it can provide a better user experience than traditional mechanical methods.
TaiSi Micro Marketing VP Zhu Jianru gave a keynote speech
In addition to the realization of necessary functions, smart surfaces and smart touch can also bring many additional advantages: first, they are lightweight , and touch switches can achieve thin and light designs; second, they are beautiful , and the panel pattern can be customized as desired; third, they are easy to operate , and there is no touch screen The integrated multi-layer menu can realize direct functional operations like physical buttons; fourth, it has high durability , the touch switch does not have any mechanical parts, will not wear and has a long life; fifth, it is anti-pollution , the sensing part can be placed on any insulated Behind the layer, it is sealed with the surrounding environment to form an integrated design.
The human-computer interaction of smart buttons mainly includes two parts: perception and feedback . The perception part mainly uses various sensors to reliably identify the user's touch actions. The main forms are capacitive, resistive, infrared, inductive, etc.; the feedback part is Provide feedback to user operations to confirm successful operations, such as vibration, sound, lighting, etc.
The combination of the two can completely replace traditional mechanical buttons in terms of functionality and user habits. At the same time, it has a more beautiful appearance than mechanical buttons, takes up less space, and enhances the technological feel of the entire vehicle.
Picture: PPT screenshot of Zhu Jianru’s speech
More and more automotive smart touch and smart surfaces require a combination of multiple touch technologies to achieve more and more reliable interactive functions. Since a single mode is prone to accidental touches and is not reliable enough in interference environments, current applications tend to use multi-mode fusion to achieve touch/button functions.
At present, most applications use capacitive touch, but the limitations of this traditional capacitive touch solution are becoming increasingly prominent. "When touching, because people are conductors, they will introduce another capacitor, so the circuit part will detect the current change, and it will not distinguish whether it is a change caused by human hand operation or a change in capacitance caused by water being sprinkled on it," explained Zhu Jianru, VP of Marketing at Taisil Micro.
Picture: PPT screenshot of Zhu Jianru’s speech
This also extends to a series of problems such as accidental key presses, blind operation of multiple keys, false triggering by water, and EMC anti-interference, etc., making the traditional solution unable to guarantee the accuracy of recognition, and has a negative impact on the application of smart touch and smart surfaces in cars. Large-scale application and popularization have caused certain obstacles.
In fact, the entire industry is actively thinking about how to improve the reliability of solutions through iterative improvements and solve existing pain points within an acceptable cost range. "The pressure-sensitive + capacitive dual-mode 3D touch chip and overall solution advocated by Tai Silicon Microelectronics came into being under this background. " Zhu Jianru said.
TaiSi Micro Marketing VP Zhu Jianru gave a keynote speech
Taisilicon released the industry's first automotive-grade dual-mode human-computer interaction chip TCAE31A in March 2022 , which integrates capacitive touch and pressure-sensitive technologies in a single chip to achieve true 3D touch.
In the dual-mode 3D touch solution of Taishi Micro, a fusion solution of capacitive touch and pressure sensing technology based on the Wheatstone bridge principle is adopted. Pressure sensing can reliably identify the pressing action, which is called Z-axis touch; at the same time, capacitive touch is used to calibrate the precise position of the pressing, which is called XY axis. The fusion of the two forms an XYZ three-axis 3D touch solution.
Picture: PPT screenshot of Zhu Jianru’s speech
According to reports, as the core of Taishiwei's new overall solution, TCAE31 is the industry's first single-chip dual-mode SOC chip that can support 2-way bridge pressure sensing and up to 10-way capacitive touch. It can realize the perception of touch positions in the X and Y directions through the design of multi-capacitive sensing. Among them, the pressure channel increases the pressure sensing capability in the vertical direction to realize the 3D touch function, and can realize multi-level functions based on different pressures, further improving the reliability of the buttons.
In terms of product parameters, the TCAE31A chip is based on the Arm® Cortex®-M0 core, with an operating frequency of up to 32MHz. The chip integrates 64KB Flash and 4KB SRAM, and is packaged in QFN28 4mm*4mm*0.75mm. This product is based on its own patented technology Tinywork®, which realizes signal linkage between peripherals, which can greatly reduce the dynamic power consumption of application solutions. It also adopts an ultra-low power consumption design, with static power consumption as low as 3uA, and the average power of a single-channel pressure sensor. The consumption is as low as 18.7uA; it has now passed the relevant AEC-Q100/200 test certification.
Picture: PPT screenshot of Zhu Jianru’s speech
“Currently, our Taisilicon 3D touch technology has entered multiple automotive application scenarios, such as touch steering wheel smart surfaces, central touch panels, zero-gravity seat control panels, PEPS door handles, touch reading lights, Roof controller, tailgate kick controller, etc." Zhu Jianru explained the characteristics of application solutions in various scenarios based on actual application cases.
Overall, compared with traditional solutions, Taishiwei's dual-mode 3D touch solution has outstanding advantages such as good waterproof effect, strong anti-interference ability, excellent EMC performance, flexible assembly method, and high cost performance.
Picture: PPT screenshot of Zhu Jianru’s speech
Taking the aforementioned problem of false triggering by water as an example, this solution generates the precise time and waveform shape of the trigger through two methods: pressure and capacitance, and performs secondary software algorithm filtering and judgment to completely eliminate the phenomenon of false triggering caused by water.
In addition, by combining pressure and capacitance, the solution can give full play to their respective advantages, making it easier for products to pass EMC testing and effectively shortening product development and market time.
-END-
This article was originally created by Mr. Xin. The content only represents the personal views of the speakers and is for communication and learning purposes. If you have any questions, please contact us at info@gsi24.com.
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