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maXTouch® Technology Class B-Certified Touch Controllers

Class B-Certified Touchscreen Controllers

Manufacturers of kitchen and laundry applications are often challenged to apply functional safety features, especially when shipping the equipment to the United States and/or Europe. To reduce the risk of fires in the kitchen and floods in the laundry room, European IEC 60730 and U.S. UL 60730 Class B specifications require safety mechanisms in home appliances such as ovens, cooktops, washing machines and clothes dryers.

Typically, these functional safety measures have been implemented in a dedicated microcontroller (MCU), but an increasing number of home appliances are now equipped with touchscreen technologies for advanced human-machine interaction.

We offer a family of Class B-certified touch controllers with unique safety features that enable system shut-off through an intuitive soft button on a touchscreen, removing the need for an external safety-certified stop or cancel button and associated MCU. They also allow an appliance to detect a touchscreen or appliance failure and shut down automatically through a variety of self-testing capabilities. For example, if the glass breaks on a cooktop, the touchscreen will turn dark and shut off the machin.e

As the number of touch-enabled home appliances continues to increase, the HA1 family of maXTouch® touchscreen controllers shifts the required safety functionality to a simplified single touchscreen interface, helping OEMs reduce costs and improve time to market.

Features of Our Class B-Enabled Touch Controllers

With five family members that range from having 112 nodes (approx 4.5 inches) to 640 nodes (up to 10 inches), our EC/UL 60730 Class B-certified touch controllers:

  • Support IEC 61000-4-6, 10 Vrms, Class A (normal touch operation) conducted noise immunity
  • Operate in a temperature range of −40° to +105°C
  • Support multi-finger thick glove (5 mm) touch
  • Support thick lenses up to 10 mm glass
  • Contain adaptive sensing (self- and mutual-capacitance)
  • Contain I2C (3.4 MHz) slave interfaces (with I2C CRC and sequence number)
  • Contain a secondary SPI (8 MHz) channel (MXT448UD/MXT640UD-HA1 only)
  • Come as comprehensive evaluation kits that include touch sensors

Functional Safety Touch Controllers

If you are developing a touchscreen-enabled home appliance or other functional safety application, our HA1 family of maXTouch® touchscreen controllers is certified to the IEC/UL 60730 Class B specification to simplify the development and qualification of your product.

Functional Safety Touch Controllers

Product Package X lines Y lines Channels Maximum Nodes (X*Y) Typical Screen Size Maximum Temperature Range
ATMXT112UD-HA1 QFN56
7 mm × 7 mm		 Up to 14 Up to 24 22 112 4.5 inches −40–85°C
ATMXT228UD-HA1 QFN56
7 mm × 7 mm		 Up to 14 Up to 24 31 228 5.8 inches −40–85°C
ATMXT336UD-HA1 QFN56
7 mm × 7 mm		 Up to 14 Up to 24 38 336 7.1 inches −40–85°C
ATMXT448UD-HA1 UFBGA88
6 mm × 6 mm		 Up to 32 Up to 20 44 448 8.3 inches −40–105°C
ATMXT640UD-HA1 UFBGA88
6 mm × 6 mm		 Up to 32 Up to 20 52 640 9.7 inches −40–105°C

As shown in the interactive diagram, the HA1 touch controller family form an integral part of the Microchip-based functional safety system solution for home appliance applications.

Design Resources

MXT640UD Touchscreen Controller Evaluation Kit

Part Number: EV52F23A

This kit (ATEVK-MXT640UD-A) is for the evaluation and development of maXTouch technology applications using the ATMXT640UD-HA1 and ATMXT448UD-HA1 touchscreen controllers.

MXT640UD Touchscreen Controller Development Board

Part Number: EV43U30A

This PCB (ATMXT640UD-DEV-PCB) is for the evaluation and development of maXTouch technology applications using the ATMXT640UD-HA1 and ATMXT448UD-HA1 touchscreen controllers.

MXT336UD Touchscreen Controller Evaluation Kit

Part Number: ATEVK-MXT336U-A

This kit (ATEVK-MXT336U-A) is for the evaluation and development of maXTouch technology applications using the ATMXT336UD-HA1, ATMXT228UD-HA1 and ATMXT112UD-HA1 touchscreen controllers.

MXT336UD Touchscreen Controller Development Board

Part Number: ATMXT336U-DEV-PCB

This PCB (ATMXT336U-DEV-PCB) is for the evaluation and development of maXTouch technology applications using the ATMXT336UD-HA1, ATMXT228UD-HA1 and ATMXT112UD-HA1 touchscreen controllers.