Catalog
maXTouch Touchscreen Controller
Key Features
- IEC/UL 60730 Class B Certified (mXT640UD-CCUBHA1 only)
- Device Encryption (touch reports and/or configuration, mXT640UD 2.0 only)
- IEC 61000-4-6, 10Vrms, Class A (normal touch operation) conducted noise immunity
- Scaled Deltas (remove false touches while cleaning with bleach or ammonia)
- Superior moisture performance
- Supports multi finger thick glove (5mm) touch
- Supports thick lenses up to 10mm glass
- Adaptive Sensing (Self and Mutual cap)
- Communication via I2C (standard) or Dual I2C + SPI (HA version) interface
- I2C-HID (Human Interface Device) protocol support (mXT640UD 1.0 only)
- PWM Output for display backlight, buzzer, or simple haptic feedback (mXT640UD 2.0 only)
- Supports up to 16 concurrent touches in real time with touch area reporting
- High voltage option via internal voltage pump to increase signal to noise ratio (SNR)
- Operating temperature range of -40 to +85 deg C (+105 deg C on HA version only)
- Package: 88-ball UFBGA
Description
AI
The ATMXT640UD touchscreen controller includes three families aimed at display sizes up to 10-inch:
· General industrial/medical/payment (with Device Encryption): mXT640UD 2.0
· General Industrial Windows OS (with HID protocol): mXT640UD 1.0
· Home Appliances (with IEC/UL 60730 Class B functional safety certification): MXT640UD-HA1 and [MXT448UD-HA1](https://www.microchip.com/en-us/product/ATMXT448UD)
Proprietary differential touch sensing delivers unparalleled noise immunity ensuring superior touch performance even in harsh environments. It enables detection and tracking of multi-finger thick gloved touch through a wide variety of overlay materials and thicknesses, even in the presence of moisture, water and even salt water. This SNR combined with a high acquisition speed provides a fast, accurate and reliable a touch position. The controller also incorporates a new self and sensor diagnostic function, which constantly monitors the integrity of the touch system
The HA1 versions are aimed at the home appliance market where Functional Safety is required. These devices are IEC/UL 60730 certified and offer unique safety-related features that enable system shut off through an intuitive soft button on a touchscreen, removing the requirement for an external safety certified stop or cancel button and associated microcontroller (MCU). They also allow an appliance to detect a touchscreen failure and shut down the appliance automatically through a variety of self-test capabilities.
