ATMXT641TD-ABRVA2

Overview

The ATMXT641TD-ABRVA2 is an automotive-grade capacitive touchscreen controller from Microchip Technology, operating within a temperature range of –40°C to +105°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 power supplies nominally at 3.3 V for digital/analog sections and 6.6 V for the internal X line drive. Packaged in a 100-pin TQFP (14 × 14 × 1 mm), it provides real-time tracking of up to 16 concurrent touches.

Feature Summary

• AEC-Q100 qualified and developed using Automotive SPICE® Level 3 certified processes.
• Supports up to 16 concurrent multi-touches with a typical report rate ≥60 Hz for 10 touches.
• Integrated noise suppression technology handles up to 240 Vpp ambient noise between 1 Hz and 1 kHz.
• Includes advanced algorithms for lens bending, palm recovery, and adjacent key suppression.

Applications

• Automotive infotainment systems requiring CISPR-25 compliance.
• On-cell or touch-on-display implementations for TFT, IPS, and OLED panels.
• Applications utilizing glass or PET film-based discrete sensors.

Procurement Notes

Verify that the specific ordering suffix matches the required tape and reel packaging option. Confirm the Grade 2 temperature rating (+105°C max) aligns with the target application environment. Ensure the firmware revision corresponds to the design requirements before finalizing procurement.

Selection Notes

Select this model over the Grade 3 variant when the application demands operation up to +105°C. Verify that the system interface supports either I²C Fast-mode Plus or SPI protocols. Consider the 100-pin TQFP footprint constraints during PCB layout planning.

Part Context

This component belongs to the maXTouch 640-node family. The 'AB' suffix indicates the extended temperature grade compared to the 'AT' variant. The 'R' denotes tape and reel packaging, while 'VA2' specifies the RoHS compliant version with firmware revision 1.0.AE.

Replacement Considerations

The ATMXT641TD-ATRVA2 serves as a direct functional substitute if the application operates within the –40°C to +85°C range. Both share identical pinouts and firmware capabilities, differing only in the specified thermal operating limits.

FAQ

What is the maximum number of simultaneous touches supported?

The device can track up to 16 concurrent touches in real time.

Does the controller support hover detection?

Yes, it supports one-finger hover detection up to 20 mm and tracking up to 15 mm, as well as multiple finger hover detection.

How does the device handle water interference?

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