ATMXT144UD-AMBSLI2CVAO

Overview

The ATMXT144UD-AMBSLI2CVAO is a maXTouch 144-node touchscreen controller designed for automotive applications. It utilizes a charge-transfer acquisition engine to support mutual and self-capacitance measurements, enabling accurate multi-touch tracking with up to 10 concurrent touches. The device operates within a temperature range of -40°C to +105°C (Grade 2) and features I2C communication supporting Standard, Fast, and Fast-mode Plus speeds. It is housed in a 56-pin VQFN package measuring 7 × 7 × 0.9 mm.

Feature Summary

• Supports up to 144 nodes with 12 X and 12 Y lines for slider or key arrays
• Includes moisture compensation for water drops up to 22 mm diameter
• Features burst frequency selection and Tx waveform shaping for EMC reduction
• Provides lens bending and palm recovery algorithms for display noise suppression

Applications

• Automotive on-cell and touch-on displays including OLED, TFT, and LCD
• Discrete out-cell sensors using glass or PET film materials
• Slider touch sensor patterns and key arrays

Procurement Notes

Verify the specific ordering suffix 'I2CVAO' against official Microchip documentation to confirm interface configuration and packaging details. Confirm that the Grade 2 temperature rating (-40°C to +105°C) aligns with system requirements. Ensure compliance with AEC-Q100 qualification standards for the target application environment.

Selection Notes

Select this component when a high node count (up to 144) is required for large touch surfaces or complex slider/key configurations. The Grade 2 temperature range suits demanding automotive environments. Verify that the host system supports I2C communication at the desired speed and can handle the interrupt-driven message protocol for real-time touch processing.

Part Context

This part belongs to the mXT144UD-AMxSL 1.0 series, which implements Microchip's patented capacitive sensing method. The 'B' in the model number indicates the extended temperature range compared to the 'T' variant. The device integrates a state-of-the-art CPU for fast response times and includes dedicated diagnostic capabilities for safety-critical feature implementation.

Replacement Considerations

The ATMXT144UD-AMTSLI2CVAO serves as a lower temperature grade alternative (-40°C to +85°C). Other maXTouch controllers may offer different node counts or interfaces but require re-evaluation of sensor design and firmware compatibility.