ATMXT641TD-ATRVA2

Overview

The ATMXT641TD-ATRVA2 is an automotive-grade capacitive touchscreen controller from Microchip Technology, operating within a temperature range of –40°C to +85°C. It supports up to 32 transmit and 20 receive lines, enabling a maximum of 640 nodes for touch sensing. The device features I²C (up to 1 MHz) and SPI (up to 8 MHz) interfaces with interrupt support. Power supplies include nominal 3.3 V for digital, I/O, and analog sections, plus a 6.6 V internal high-voltage drive. Packaged in a 100-pin TQFP (14 × 14 × 1 mm), it is supplied in tape and reel format.

Feature Summary

• AEC-Q100 qualified and developed following Automotive SPICE Level 3 certified processes.
• Supports up to 16 concurrent touches with real-time tracking and one-finger hover detection up to 20 mm.
• Integrated noise suppression handles up to 240 Vpp ambient noise between 1 Hz and 1 kHz.
• Includes on-chip gesture reporting, palm recovery algorithms, and lens bending noise removal.

Applications

• Automotive infotainment systems requiring CISPR-25 compliance.
• Displays supporting TFT, IPS, and OLED technologies.
• Systems utilizing glass or PET film-based discrete sensors.
• Applications requiring synchronization with display refresh timing.

Procurement Notes

Verify the specific ordering suffix 'R' confirms tape and reel packaging rather than standard tube or tray supply. Confirm that the 'V2' suffix corresponds to the required firmware revision 1.0.AE and RoHS compliance status before finalizing procurement orders.

Selection Notes

Select this model for Grade 3 automotive applications (-40°C to +85°C). For environments requiring operation up to +105°C, consider the mXT641TD-AB variant instead. Ensure the host system supports the required 3.3 V logic levels and provides adequate current for the 6.6 V internal voltage pump if used.

Part Context

This component belongs to the maXTouch Adaptive Sensing Touchscreen Technology family. It utilizes a unique charge-transfer acquisition engine to implement patented capacitive sensing methods, combining mutual and self-capacitance measurements for reliable touch information processing.

Replacement Considerations

The ATMXT641TD-ATVA2 serves as the tube-packaged equivalent. The ATMXT641TD-ABRVA2 offers the same functionality but with an extended temperature range up to +105°C. Verify package compatibility when substituting these variants.

FAQ

What is the maximum number of concurrent touches supported?

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

Does the controller support glove interaction?

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

How does the device handle water interference?

It provides moisture compensation to prevent false touches from condensation or water drops up to 22 mm diameter while maintaining one-finger tracking.