ATMXT228UD-MAURHA1

Overview

The ATMXT228UD-MAURHA1 is a maXTouch UD Series touchscreen controller IC designed for home appliance applications. It utilizes a charge-transfer acquisition engine and supports up to 228 nodes, configured as 14 transmit (X) lines and 24 receive (Y) lines. The device operates on a nominal 3.3V supply with an internal 6.6V voltage pump for X line drive. It features I2C communication supporting Standard, Fast, and Fast-mode Plus speeds, alongside an SPI debug interface. Packaged in a 56-pin XQFN (6x6 mm), it functions within an industrial temperature range of -40°C to +85°C.

Feature Summary

• Supports up to 10 concurrent touches with a typical report rate of ≥70 Hz and initial touch latency <18 ms.
• Includes UL/IEC 60730 Class B functional safety support with self-diagnostics and heartbeat signals.
• Features moisture/water compensation to prevent false touches from condensation or drops up to 22 mm diameter.
• 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 display integration including TFT, LCD, and OLED

Procurement Notes

Verify the 'R' suffix in the part number confirms Tape and Reel packaging, distinct from the tray-supplied ATMXT228UD-MAUHA1. Confirm firmware revision 1.0.AB compatibility during sourcing. Ensure procurement channels provide valid traceability codes and RoHS compliance documentation consistent with Microchip standards.

Selection Notes

Select this component for designs requiring robust capacitive sensing in noisy environments like home appliances. The 228-node capacity supports screens up to 5.75 inches with a 3:2 aspect ratio. Verify that the host system can accommodate the 56-pin XQFN package dimensions and provides the necessary 3.3V digital/analog supplies and 6.6V XVdd drive capability.

Part Context

This part belongs to the maXTouch UD Series, specifically optimized for home appliance use cases. It represents the tape-and-reel variant of the mXT228UD family, offering the same electrical characteristics as the tray-packaged version but tailored for automated surface-mount assembly processes.

Replacement Considerations

The ATMXT228UD-MAUHA1 serves as the tray-packaged equivalent. Other maXTouch devices may require significant schematic and firmware changes due to differing node counts or pin configurations.