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The Human Machine Interface (HMI) includes the electronics required to signal and control the state of industrial automation equipment. These interface products can range from a basic LED status indicator to a 20-inch TFT panel with touchscreen interface. HMI applications require mechanical robustness and resistance to water, dust, moisture, a wide range of temperatures, and, in some environments, secure communication. They should provide Ingress Protection (IP) ratings up to IP65, IP67, and IP68. The unique capacitive Atmel® QTouch technology, Atmel SAM9 microprocessors, and Atmel CryptoAuthentication™ devices enable designers to meet these requirements and more, with an optimized BOM.

Features and Benefits

  • Supports high source and sink output IO capabilities up to 60mA for direct drive of LEDs.
  • High-speed PWM units enable LED dimming and screen back lighting.
  • Robust touch technology provides reduced wear and increased product lifetime. Due to its superior field penetration, Atmel Touch technology will operate through 6mm thick, non-conductive surfaces.
  • The excellent signal-to-noise ratio of the Atmel QMatrix™ touch technology makes the design immune to water, moisture, or dust and enables operators to use gloves.
  • Capacitive touch eases design of full hermetic or sealed products, while power efficiency minimizes heat dissipation.
  • Free Atmel QTouch software library on the Atmel microcontroller lets designers avoid the cost of an additional component.
  • The Atmel touch spread spectrum frequency implementation helps designers meet electro-magnetic emission requirements.
  • The Atmel industrial microprocessor product portfolio with integrated LCD, combined with the Atmel QTouch technology, are the ideal candidates for your next control panel design.
  • The Atmel CryptoAuthentication family of hardware security devices provides cost effective solutions for authenticated and encrypted communications between HMI and industrial equipment.

HMI Devices

  • LED Indicators and Mechanical Switches are a leading HMI for industrial applications, and Atmel AVR® and AT91SAM microcontrollers offer a variety of benefits.
  • Capacitive Touch Technology for HMI helps protect industrial interface modules, while increasing design flexibility and enhancing look and feel.
  • Industrial Control Panels with LCD Displays provide the operator an efficient, flexible way to monitor and control increasingly complex automated processes.
  • Hardware Security Products protect firmware integrity from tampering to assure continuous and reliable performance.

Atmel HMI solutions help reduce board space and enable a lower BOM. They do not require a separate LCD controller chip, or an external resistive touchscreen chip. Standard DDR2 external memory provides lower cost and longer availability. Atmel solutions also provide high performance with high-speed communication, and are available with ready-to-use software support. An evaluation kit is available for each Atmel SAM9 with free Linux® distribution and Microsoft® Windows® Embedded CE BSP.

Atmel Products

TouchMemorySecure Authentication
megaAVR: megaAVRxx9x (LCD)

ARM-based Solutions:
- SAM9263
- SAM9G45
- SAM9M10
- SAM9M11
- SAM9RL64
Buttons, Sliders and Wheels

QTouch library

maXTouch Touchscreen controller


Reference Designs

[ - ] Wireless Thermostat with SAM4LC Reference Design

Abstract: This reference design is a complete wireless thermostat using Atmel ATSAM4LC microcontroller and AT86RF233 2.4GHz transceiver. The user interface consists of 6 touch buttons and a custom segment LCD with backlight. Users can change the thermostat settings for every day of the week, with a granularity of 6 hours. Communication with the HVAC system is done by ZigBee and the Atmel Lightweight Mesh stack.

Key Features:

  • Temperature/Humidity/Ambient light sense capabilities
  • FreeRTOS™ tickless implementation
  • 6 capasitive touch buttons (Atmel QTouch Library)
  • ZigBee compliant RF communication (Atmel Lightweight Mesh)
  • Atmel AT86RF233 2.4GHz RF transceiver
  • Ten-month life time with two AA alkaline batteries

Related Files:

Atmel Devices:

[ - ] QTouch Robustness Reference Design

Abstract: This reference design demonstrates a robust capacitive touch user interface solution based on Atmel ATSAMD20 with Peripheral Touch Controller (PTC). The design allows users to easily apply Atmel QTouch technology to achieve best-in-class noise immunity and moisture tolerance in challenging environments with a high level of electromagnetic noise – ideal for harsh environments.

Key Features:

  • IEC 61000-4-6 10V Conducted Immunity tolerant QTouch Safety Library
  • IEC/UL 60730 Class B certified QTouch Safety Library firmware
  • FMEA support
  • Six self-capacitance buttons with Philipp™ Spring
  • Four mutual-capacitance buttons
  • One 8-channel mutual-capacitance slider

Related Files:

Atmel Devices:

Customer Success Stories

Discover how leading Industrial Automation manufacturers are building advanced solutions with Atmel technology.

  • RAFI, a leading company for industrial HMI, is using Atmel QTouch technology to support its products.

Reference Designs and Tools

Use our reference designs, software tools, and other resources as a starting point to build and design your own solutions.

Enabling Technologies

Learn more about the Atmel solution Application Notes, Devices, and Tools and Software.