Electronic enthusiast website news : As the size of the capacitive touch screen increases, the most common advanced functional requirement is the stylus. The thin-tip stylus function with built-in anti-palm touch function on the large screen is very in line with the user's intuition needs, because it is very similar to ordinary paper and pen. It can provide consumers with a natural user interface, combining the ease of use of pen and paper with the flexibility of a PC. As the screen size of touch devices increases, the main challenge facing engineers is to achieve a satisfactory experience for users on small-sized mobile phones on a larger touch screen. This means scanning more sensor nodes and a larger screen surface in the same time. For the stylus, it is required that the touch screen controller can dynamically switch back and forth between the stylus and multi-finger touch input. In addition, advanced algorithms and sensing methods are needed to detect very small signals from the stylus, and at the same time to eliminate large and useless signals from the palm of the user. Therefore, the processor must be able to recognize smaller signals under more noise, while maintaining speed, accuracy, and quick response, all of which are necessary for a good user interface experience. Jagadish Kumaran, senior marketing manager of TrueTouch at Cypress Semiconductor, said that a major trend in the market is that manufacturers are striving to achieve differentiation through larger sizes and more advanced features. How does the touch controller achieve unmatched resistance to charger noise? Currently, for touch screen devices, charging (charger) noise is the most real and most common problem facing them. How to solve the problems of false triggering, sensitivity, accuracy and other problems that occur when using a touch screen device during charging is an issue that engineers must consider in the design process. In this regard, Jagadish Kumaran took the TMA568 touch controller as an example to explain the game in depth from the performance of TMA568 when using wireless charging / third-party mobile phone chargers, the patented technology-the excellent features of ChargerArmor ™, and the flexible PSoC architecture How Plath achieved differentiation. Jagadish Kumaran emphasized that when using wireless charging / third-party mobile phone chargers, TMA568 uses a series of tools to mitigate the impact of noise on the touch screen controller. We have several exclusive tips that can eliminate problems such as false or missing points, position jitter, false lift, and signal attenuation. Successful ChargerArmor noise cancellation technology-the TrueTouch Gen5 series of ChargerArmor ™ features an unprecedented 40V peak-to-peak (Vpp) anti-charger noise capability. Test conditions are: 1 to 500kHz, ultra-thin 0.5mm coating, and maximum 22mm finger size. This is the most stringent test parameter for touch screen controllers. At present, no competitor can achieve more than 15Vpp anti-noise performance under the same test conditions. Comparison of the anti-noise ability of Tupia Cypress TMA568 and other competitors Tx-Boost Technology-TrueTouch also has ultra-high Tx voltage multi-phase Tx technology, which we call Tx-Boost ™. This technology can drive the screen with 10V Tx and up to 37 multiphase Tx (equivalent to 28V Tx), which is significantly better than competitors. The narrow-band Rx channel and single correlation scan architecture make the TMA568 immune to interference from broadband noise sources. Hardware DSP filter-TMA568 also contains advanced hardware DSP filter, which can effectively reduce the influence of charger noise by filtering out noise samples. The highest transmission frequency is 500kHz-the highest transmission frequency supported by TMA568 is 500kHz, and has built-in adaptive frequency hopping capability. This capability allows it to be selected over a wider frequency range to achieve optimal performance. Flexible PSoC architecture-All Cypress touchscreen solutions utilize PSoC's flexible architecture to achieve leading performance. The digital and analog modules in TMA568 can be configured for specific designs to achieve the best performance. How will the noise interference upgrade of thin and light touch screen equipment TMA568 achieve excellent touch performance? Nowadays, thinness is fashion. The appearance of touch screen devices has become thinner and thinner, especially for touch screen mobile phones, and the noise of chargers and display screens has become larger and larger. At the same time, the environment in which consumers are using devices is getting worse, so providing superior touch performance requires a more durable touch screen controller. Jagadish Kumaran said that since the anti-noise performance of TrueTouch has been very advanced, TMA568 can fully cope with the touch performance of ultra-thin touch devices. At the same time ensure a high-quality user experience. TMA568 also supports Cypress's single layer independent multi-touch (SLIM) sensor patent, so that when designing ultra-thin touch devices, there is no need to worry about performance degradation. Jagadish Kumaran revealed, "We are also working with several display suppliers for on-cell and in-cell designs. The excellent noise resistance of TMA568 makes it an ideal choice for these bonded structures." In summary, the touch screen is a complex system. Users want to be able to use touch devices reliably in various harsh environmental conditions (such as high and low temperatures, humidity, condensation, sweat on the screen, etc.), and when using third-party chargers, wireless charging, and car charging. Cypress's TMA568 is designed to meet these challenges, while providing a wealth of advanced features to achieve a good user experience, such as passive stylus, glove touch, and hover. In addition, in terms of oil resistance, TMA568 can be perfectly used with oleophobic coating and protective film. TMA568 supports the dynamic baseline recalibration function, which can be automatically adjusted according to changes in screen characteristics to achieve reliable touch sensing. ——This article is selected from the “Change The World column†of the “Touch Technology Special Issue†of the electronic enthusiast website in October.
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