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M1 Generation of maXTouch® Touchscreen Controllers

The M1 family of maXTouch® touchscreen controllers targets automotive and industrial applications. Devices in this family offer full-touch channel reconfiguration, a smart mutual acquisition system, Knob-on-Display™ technology, simultaneous serial communication interfaces and ultra-low-latency haptic control.

Key Features of M1 Family of Touchscreen Controllers

Feature ATMXT1296M1T ATMXT1296M1E
Reconfigurable Touch Channels Up to 72 Up to 72
Smart Mutual Acquisition Yes Yes
Differential Self and Mutual Capacitance Yes Yes
Noise Equalization for Free-Form Display Yes Yes
Self-Tests and Sensor Diagnostics Yes Yes
Primary Communication Interface I2C or SPI​ I2C or SPI​
Additional Discrete Touch Buttons Up to 16 Up to 16
Knob-on-Display™ Technology N/A Yes
ISO 26262 ASIL-B Ready N/A Yes
Automated-Pattern Pulse-Width Modulators (PWMs)  N/A 2
Shape Event Trigger for Ultra-Low-Latency Haptics N/A Yes
Secondary Communication Interface N/A I2C or SPI​
Sensor Data Streaming N/A Yes
Configuration and Communication Encryption N/A Yes
General Purpose Analog-to-Digital Converters (ADCs) N/A 2
View ATMXT1296M1 Family Product Details

Fast and Easy Touch Channel Reconfiguration Via Soft Parameters

The ATMXT1296M1 family supports up to 72 touch channels, and it is the industry’s first touchscreen controller to enable sensor channel reconfiguration via soft parameters. The driving and receiving channels can be reconfigured to match the exact screen format, ranging from 1:1 to 5:1 aspect ratios and including the popular 8:3 aspect ratio used in automotive applications. These parameter changes do not require any firmware modifications. You can save additional development and validation time by reusing a common PCB with single touch connector to support different touch sensor aspect ratios.

Touch Panel Adaptation With the ATMXT1296M1 and maXTouch Studio

Learn how to reconfigure the ATMXT1296M1 family of touchscreen controllers from a 16:9 to an 8:3 sensor format in less than one minute.

Flexible and Powerful Communication Interfaces

The ATMXT1296M1 family feature multiple communications interfaces. These include:

  • Two-client I2C operating at up to 3.4 MHz
  • Two SPIs operating at up to 8 MHz

As shown in the interactive diagram below, two of these interfaces can be configured to run simultaneously using the maXTouch touchscreen controller’s object-based communication protocol. This allows a bridgeless connection to the back channel of the video link for touch information and a connection to a local microcontroller (MCU). The bridgeless topology reduces touch latency to improve the user experience, ensuring full compatibility with the maXTouch technology software driver, available for all major automotive operating systems, including Linux®, Android™ and QNX®.

If you connect the second client interface to a local MCU, you can implement designs that support different display board topologies and requirements. This solution provides:

  • A redundancy link to the head unit through a CAN bus or 10BASE-T1S automotive Ethernet link for increased functional safety at the system level
  • Local access and control of features such as a capacitive keys reporting, live touch sensor diagnostics and raw data for external and custom post-processing
  • Over-the-air and secured firmware update capability using our TrustAnchor100 (TA100) companion chip

Functional Safety Features

The ATMXT1296M1 family offers a variety of functional safety features to constantly check the integrity of the following functions during run time:

  • Touch controller operation:
  • Built-in self-tests for CPU, clocks, touch acquisition engine, RAM and power supplies
  • Embedded Flash with Error Correcting Code (ECC)
  • Integrity of attached flex PCB and touch sensor:
  • Automatic detection of shorts and opens
  • Sensor baseline configurable test limits

Diagnostic information and errors are reported via standard Object Based Protocol messages or on the dedicated “Alive” pin.

We offer a Failure Modes Effects and Diagnostic Analysis (FMEDA) and a functional safety manual to ease the design, development and certification of your ISO 26262 Automotive Safety Integrity Level B (ASIL-B) applications.

Reduced RF Emissions

With larger screens in cars, the RF emissions generated by the projected capacitive touch technology are increasing proportionally. Emission limits vary in amplitude, frequency and bandwidth for each major car manufacturer, so they need a flexible solution that will meet their specific limits.

The ATMXT1296M1 family provides high-resolution transmit waveform control to reduce RF emissions and avoid interference with the car radio or RFID systems. It uses a dedicated, on-chip, 64-level Digital-to-Analog Converter (DAC) to accurately shape the waveform of the transmitting lines. This allows you to precisely control the frequency response and optimize the harmonic emissions without compromising the touch sensitivity.

Separate Touch Keys and Pulse-Width Modulation (PWM) Outputs

Additional auxiliary lines, called GKeys, allow you to implement up to 16 touch buttons without having to use the dedicated channels for the touchscreen. The dedicated configuration settings for the Gkeys allow you to select specific sensor material, thickness and overlays for the touch buttons. Up to eight of these Gkeys can be implemented in self-capacitance mode to provide superior moisture immunity.

The ATMXT1296M1 family offers two enhanced PWM ports to support digital control of the display backlighting unit and haptic feedback. Haptic actuators benefit from the ability to be manipulated using high-resolution waveforms. These waveforms are crafted from PWM control patterns that you can define and store within the chip's memory. Direct Memory Addressing (DMA) efficiently transfers these patterns to the PWM block, ensuring precise control over the haptic feedback experience.

For haptic applications that use piezo actuators, you can use the HV56266 high-voltage operational amplifier. See our HV56266 One-Channel High-Voltage Amplifier Haptics Evaluation Kit for more information.

Design Resources

Part Number: EV51W41A

ATMXT1296M1 Touchscreen Controller Evaluation Kit

Part Number: EV51W41A

This kit (ATEVK-MXT1296M1T-A) is for the evaluation and development of applications using our automotive-qualified ATMXT1296M1 family of maXTouch touchscreen controllers.

The kit contains:

  • 12.3”/8:3 aspect ratio touchscreen, 1.1 mm One Glass Solution (OGS)
  • ATMXT1296M1T-I2C-PCB
  • ATUSB-HSBB-PCB
  • G-Key PCB Mutual (up to 16 keys) with laminated cover lens
  • G-Key PCB Self-Cap (up to 8 keys) with laminated cover lens
Part Number: EV36V52A

ATMXT1296M1 Touchscreen Controller Stand-Alone Development Board

Part Number: EV36V52A

This PCB (ATMXT1296M1T-I2C-PCB) is for the evaluation and development of applications using our automotive-qualified ATMXT1296M1 family of maXTouch touchscreen controllers.