ATMXT112UD-MAURHA1

Overview

The ATMXT112UD-MAURHA1 is a maXTouch UD Series touchscreen controller from Microchip Technology, designed for home appliance applications. It features a unique charge-transfer acquisition engine supporting both mutual and self capacitance measurements to ensure accurate touch classification and tracking. The device supports up to 14 transmit lines and 24 receive lines, allocating a maximum of 112 nodes for sensor electrodes. It operates on a nominal 3.3V supply with an internal 6.6V voltage pump for X line drive. Communication is handled via I2C interface (up to 1 MHz) with an optional SPI debug interface. The component is housed in a 56-pin XQFN package (6x6x0.4 mm) and functions within an industrial temperature range of -40°C to +85°C.

Feature Summary

• Supports up to 10 concurrent touches with real-time tracking and initial touch latency under 18 ms.
• Includes moisture/water compensation to prevent false touches from condensation or drops up to 22 mm diameter.
• Features UL/IEC 60730 Class B functional safety support with self-diagnostics and heartbeat signal output.
• Integrates noise suppression technology capable of handling up to 240 V PP ambient noise between 1 Hz and 1 kHz.

Applications

• Home appliance control panels
• Discrete or out-cell glass and PET film-based sensors
• On-cell or touch-on displays including TFT, LCD (ITPS, IPS), and OLED

Procurement Notes

Verify the specific ordering suffix 'R' confirms tape and reel packaging, distinct from the tray-supplied ATMXT112UD-MAUHA1. Confirm firmware revision 1.0.AB compatibility during integration. Ensure the design adheres to the recommended land pattern for the 56-pin XQFN package to maintain soldering integrity. Check for RoHS compliance status as detailed in the manufacturer's documentation.

Selection Notes

Select this controller for designs requiring robust multi-touch performance in noisy environments typical of home appliances. The integrated water rejection algorithms are suitable for surfaces exposed to condensation. Ensure the host system supports I2C communication speeds up to 1 MHz for optimal report rates. Verify that the display stack-up allows for the required 10 mm glass or 5 mm PMMA coverage for bare finger operation.

Part Context

This part belongs to the maXTouch UD Series, specifically optimized for home appliance use cases. It shares the core mXT112 architecture but includes specific hardware and firmware configurations for durability and environmental resistance. The 'MAURHA1' designation indicates the XQFN package, industrial temperature grade, and tape and reel shipping format.

Replacement Considerations

The tray-packaged variant ATMXT112UD-MAUHA1 offers identical electrical and functional specifications but differs only in packaging format. No other direct cross-model substitutes are documented in the provided source material.