ATMXT449TD-ABRVA2

Overview

The ATMXT449TD-ABRVA2 is an automotive-grade maXTouch touchscreen controller from Microchip Technology, operating within a –40°C to +105°C temperature range. It utilizes a patented charge-transfer acquisition engine to support up to 32 X and 20 Y lines, allocating a maximum of 448 nodes for touch sensing. The device enables real-time tracking of up to 16 concurrent touches with a typical report rate of ≥60 Hz for ten fingers. It integrates mutual and self-capacitance measurements, offering advanced features such as moisture compensation, hover detection, and glove support. Powered by nominal 3.3 V supplies, it communicates via I²C or SPI interfaces.

Feature Summary

• AEC-Q100 qualified and developed under Automotive SPICE Level 3 processes for automotive reliability.
• Supports up to 448 nodes with 32 transmit and 20 receive lines for high-resolution sensing.
• Enables 16-point multi-touch tracking with ≤25 ms initial latency and up to 250 Hz single-finger reporting.
• Includes noise suppression technology handling up to 240 Vpp ambient noise and CISPR-25 compliance.

Applications

• Automotive infotainment systems requiring AEC-Q100 certification.
• On-cell and touch-on-display implementations for TFT, IPS, and OLED panels.
• Discrete sensor applications using glass or PET film-based front panels.
• Safety-critical interfaces utilizing automatic touch sensor diagnostics.

Procurement Notes

Verify the specific ordering suffix 'R' indicates tape and reel packaging rather than standard tray supply. Confirm that the 'AB' designation corresponds to the Grade 2 temperature range of –40°C to +105°C. Ensure firmware revision 1.0.AE compatibility requirements are met for the target application design.

Selection Notes

Select this model when an extended industrial/automotive temperature range up to 105°C is required, distinguishing it from the AT variant limited to 85°C. The AB grade is suitable for environments where higher thermal stability is critical. Verify that the 100-pin TQFP package dimensions fit the PCB layout constraints.

Part Context

This component belongs to the mXT449TD family of maXTouch controllers. The ATMXT449TD-ABRVA2 specifically denotes the automotive-grade sample version with tape and reel packaging. It shares core architecture with the ATMXT449TD-ATVA2 but differs in thermal specifications and packaging format.

Replacement Considerations

Publicly confirmed substitute part numbers are not provided in the source documentation. Designers should consult Microchip sales offices for alternative packages or updated firmware revisions if current stock is unavailable.