ATMXT641TD-ATVA2

Overview

The ATMXT641TD-ATVA2 is an automotive-grade capacitive touchscreen controller from Microchip Technology, designed for high-performance multi-touch applications. It supports up to 640 nodes with a maximum configuration of 32 transmit and 20 receive lines. The device enables tracking of up to 16 concurrent touches at reporting rates up to 250 Hz for single-finger input. It integrates advanced noise suppression, moisture compensation, and hover detection capabilities. Communication is facilitated via I2C (up to 1 MHz) or SPI (up to 8 MHz) interfaces. The component operates within a temperature range of –40°C to +85°C and is housed in a 100-pin TQFP package.

Feature Summary

• AEC-Q100 qualified and developed using Automotive SPICE Level 3 certified processes.
• Supports up to 16 simultaneous touch points with initial latency under 25 ms.
• Integrated hover detection supporting one-finger hover up to 20 mm detection range.
• Advanced noise immunity handling up to 240 Vpp ambient noise between 1 Hz and 1 kHz.

Applications

• Automotive infotainment systems requiring robust touch interaction.
• Industrial control panels exposed to environmental interference.
• Consumer electronics utilizing on-cell or touch-on-display technologies.

Procurement Notes

Verify the specific ordering suffix 'VA2' corresponds to the tray packaging format as indicated in official documentation. Confirm that the Grade 3 temperature rating (-40°C to +85°C) aligns with the target application environment requirements before finalizing procurement decisions.

Selection Notes

Select this model when AEC-Q100 qualification is mandatory for the system design. Ensure the host processor supports either I2C or SPI protocols for communication. Consider the 100-pin TQFP footprint constraints during PCB layout planning to accommodate the required pitch and thermal dissipation characteristics.

Part Context

This part belongs to the maXTouch 640-node family, specifically the mXT641TD series. It utilizes Microchip's patented charge-transfer acquisition engine to implement capacitive sensing. The device distinguishes itself through integrated gesture recognition and lens bending algorithms designed to mitigate display-induced noise in modern screen assemblies.

Replacement Considerations

The ATMXT641TD-ATRVA2 serves as a functional equivalent offering identical electrical specifications but supplied in tape and reel packaging instead of trays. Verify pinout compatibility if substituting between these variants in existing designs.

FAQ

What is the maximum number of concurrent touches supported?

The device supports tracking up to 16 concurrent touches in real time.

Does the controller support glove operation?

Yes, it supports multiple-finger glove touches up to 1.5 mm thickness and single-finger glove touches up to 5 mm thickness, subject to stack-up design.

How does the device handle water interference?

It features moisture compensation that prevents false touches from condensation or water drops up to 22 mm diameter while maintaining one-finger tracking capability.