Mxt1296m1t provides various communication options, ISO 26262 functional security support and flexible RF transmission control

With the increasing demand for large touch screens and flexible shapes in the automotive market, Microchip Technology Inc. (American microchip technology company) announced the launch of a new maxtouch ® Touch screen controller helps automotive developers meet various unique aspect ratio requirements of on-board touch screen. This new product includes additional functional security support required by the OEM.

The mxt1296m1t can reconfigure the drive and receive touch channels to match the accurate screen format, with an aspect ratio from 1:1 to 5:1, including the mainstream 8:3 vehicle aspect ratio. This function enables customers to effectively use the existing number of touch channels without selecting a larger and more expensive touch controller. In addition, customers can support different touch sensor aspect ratios by reusing the general PCB design, so as to save additional development and verification time and resources. Mxt1296m1t is the first product in the industry to realize sensor channel reconfiguration through parameters. These settings do not require firmware modifications, reducing design risk and accelerating time to market.

Clayton pillion, director of human machine interface Business Department of microchip, said: “With the popularity of touch screen display in automobile user interface, automobile manufacturers are using various display formats and shapes to adapt to the internal design and highlight their brand image. As the world’s first supplier of automobile touch screen controller, we know that it is very important for customers who take into account the unique functions and the increasing functional safety requirements of ISO 26262 Products with enhanced diagnostic capabilities are a major advantage. “

Microchip’s new maxtouch touch touch screen controller provides two simultaneous communication interfaces, which can be bridgeless connected with the back-end channel of LVDS video link to obtain touch information and connected with local single chip microcomputer (MCU). The bridgeless topology reduces touch latency and improves the user experience. It also supports full compatibility with maxtouch software drivers and is applicable to all major automotive operating systems, including Linux ®、 Android ™ And QNX ®。 When connected to a suitable local MCU, the second interface provides:

-It is connected to the redundant link of the vehicle head device through CAN bus or 10base-t1s vehicle Ethernet to improve the system level functional safety

-Local access and control of maxtouch touch touch screen controller functions, such as capacitive key reporting, real-time touch sensor diagnostics, and raw data for external and custom post-processing.

-Wireless and secure firmware update using microchip’s trustanchor100 supporting chip

The mxt1296m1t incorporates various functional safety features to continuously check the integrity of the operation of the touch controller and the connected touch sensors. Failure mode effect and diagnostic analysis (fmeda) and functional safety manual greatly simplify the customer’s experience in designing, building and certifying automotive safety integrity level B (asil-b) application systems conforming to ISO 26262 standard.

Mxt1296m1t can realize high-resolution transmission waveform control to reduce RF radiation and avoid interference to automotive radio or RFID system. With the increase of automobile screen size, the RF radiation generated by capacitive touch technology is expected to increase. The radiation limits of major automobile manufacturers vary in amplitude, frequency and bandwidth. The mxt1296m1t uses a dedicated on-chip 64 series analog-to-digital converter (DAC) to accurately shape the waveform of the transmission line. This enables designers to accurately control the frequency response and optimize harmonic emission to meet the limits specified by specific OEMs.

development tool

The latest version of maxtouch studio integrated development environment (IDE) supports the configuration and debugging of mxt1296m1t.

Orderable development kits include:

-Atevk-mxt1296m1t-a: various evaluation kits, including development board with USB bridge, 12.3 “/ 8:3 format / 1.1mm single glass solution (OGS) touch pad, and touch key add-on board for mutual and self capacitance

-Atmxt1296m1t-i2c-pcb: development board for connecting customer touch sensors

supply commodity

The mxt1296m1t is now in mass production. ISO 26262 fmeda and functional safety manual will be available in the first quarter of 2022.

Trustanchor 100 supporting chips are now in mass production.

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