ATMXT449TD-ATVA2

Overview

The ATMXT449TD-ATVA2 is an automotive-grade maXTouch touchscreen controller from Microchip Technology, designed for capacitive sensing applications. It supports up to 32 transmit and 20 receive lines, allocating a maximum of 448 nodes for touch detection. The device enables tracking of up to 16 concurrent touches with a typical report rate of at least 60 Hz for ten fingers. Operating within a temperature range of –40°C to +85°C, it utilizes a unique charge-transfer acquisition engine to measure mutual and self capacitance. The controller integrates advanced algorithms for noise suppression, water compensation, and glove support, ensuring reliable performance in demanding environments.

Feature Summary

• Automotive qualification: AEC-Q100 certified and developed following Automotive SPICE Level 3 processes.
• High-performance sensing: Supports up to 16 concurrent touches with initial latency under 25 ms.
• Advanced environmental robustness: Features moisture/water compensation, hover support, and multi-finger glove detection.
• Flexible connectivity: Offers I²C (up to 1 MHz) and SPI (up to 8 MHz) interfaces with interrupt capabilities.

Applications

• Automotive infotainment systems requiring high reliability and low latency.
• In-dash displays and control panels with glass or PET front panels.
• Applications supporting on-cell or touch-on-display integration technologies.
• Systems requiring synchronization with display refresh timing.

Procurement Notes

Verify the specific ordering suffix 'VA2' corresponds to the intended sample type and packaging configuration. Confirm that the Grade 3 temperature rating (–40°C to +85°C) aligns with the target application environment. Ensure design compliance with the recommended stack-up and sensor patterns approved by Microchip or its qualified partners for optimal performance.

Selection Notes

Select this component when automotive certification (AEC-Q100) and high node count (448 max) are required. Choose the AT variant for standard automotive temperature ranges (-40°C to +85°C). Consider the AB variant if operation up to +105°C is necessary. Evaluate interface requirements to determine if I²C or SPI communication best suits the system architecture.

Part Context

This part belongs to the mXT449TD family, which includes variants like the mXT449TD-AB for extended temperature ranges. The 'V' indicates a sample type, and 'A2' denotes the specific firmware revision and pattern configuration. It is distinct from non-automotive maXTouch controllers and offers higher node density compared to smaller footprint devices.

Replacement Considerations

Direct replacements within the same package and pinout include other mXT449TD variants such as the ATMXT449TD-ABVA2 for higher temperature operation. For different node counts or packages, consult the full maXTouch portfolio datasheet to ensure compatibility with existing sensor designs and firmware configurations.