ATMXT449TD-ABVA2

Overview

The ATMXT449TD-ABVA2 is an automotive-grade capacitive touchscreen controller from Microchip Technology, designed for high-performance multi-touch applications. It supports up to 32 transmit and 20 receive lines, allocating a maximum of 448 nodes for sensor electrodes. The device operates within a temperature range of –40°C to +105°C and utilizes a charge-transfer acquisition engine for accurate touch classification. Key electrical specifications include nominal 3.3 V supplies for digital (Vdd), I/O (VddIO), and analog (AVdd) sections, with an internal voltage pump generating 6.6 V for the X line drive (XVdd). Communication interfaces include I²C (up to 1 MHz) and SPI (up to 8 MHz).

Feature Summary

• Automotive qualification: AEC-Q100 certified and developed under Automotive SPICE Level 3 processes.
• Advanced sensing: Supports mutual and self-capacitance measurements with up to 16 concurrent touches at ≥60 Hz report rate.
• Environmental robustness: Features moisture/water compensation, hover support, and noise suppression against power-line interference.
• Flexible integration: Compatible with on-cell, touch-on-display, and discrete sensors using PET or glass front panels.

Applications

• Automotive infotainment systems requiring AEC-Q100 compliance.
• Industrial control panels needing operation up to +105°C.
• Displays supporting palm rejection and glove touch detection.

Procurement Notes

Verify that the specific ordering suffix matches the required temperature grade and packaging format. The 'AB' suffix indicates the Grade 2 temperature range (-40°C to +105°C), while 'AT' denotes Grade 3 (-40°C to +85°C). Confirm whether tray or tape-and-reel packaging is needed, as this affects the final part number designation. Ensure firmware revision compatibility with existing system configurations.

Selection Notes

Select the ATMXT449TD-ABVA2 when an extended operating temperature range up to +105°C is required for automotive or industrial environments. This model provides the same node count and interface capabilities as the AT variant but meets stricter thermal specifications. Consider the 100-pin TQFP package dimensions (14 × 14 × 1 mm) during PCB layout planning. Verify that the host system supports the necessary I²C or SPI clock speeds for optimal performance.

Part Context

This component belongs to the maXTouch 449 series, which includes variants like the ATMXT449TD-ATVA2. The series is characterized by its adaptive sensing technology and support for large sensor arrays. The ABVA2 variant specifically targets applications requiring higher thermal resilience compared to the standard AT version, while maintaining identical functional parameters and pinout configurations.

Replacement Considerations

The ATMXT449TD-ATVA2 serves as a lower-temperature alternative within the same family. Substitution requires verifying that the application's maximum ambient temperature does not exceed +85°C. Pin compatibility is maintained across both variants, allowing for potential board-level swaps if thermal constraints permit.