ATMXT144UD-AMTI2CVA1

Overview

The ATMXT144UD-AMTI2CVA1 is a maXTouch touchscreen controller from Microchip Technology, designed for automotive applications. It features a charge-transfer acquisition engine supporting up to 144 nodes, configured with 12 transmit and 24 receive lines. The device operates on a nominal 3.3V supply and communicates via an I2C slave interface supporting Standard (100 kHz), Fast (400 kHz), and Fast-mode Plus (1 MHz) speeds. It is housed in a 56-pin VQFN package (7 × 7 × 0.9 mm) and supports an operating temperature range of -40°C to +85°C.

Feature Summary

• Supports up to 144 nodes with 12 X and 24 Y lines for multi-touch tracking of up to 10 concurrent touches.
• I2C interface with Standard, Fast, and Fast-mode Plus speed options.
• AEC-Q100 qualified and developed following Automotive SPICE Level 3 certified processes.
• Includes moisture compensation, palm recovery algorithms, and burst frequency control for noise suppression.

Applications

• Automotive infotainment displays
• Vehicle instrument clusters
• Center stack touch interfaces

Procurement Notes

Verify the ordering suffix 'R' indicates tape and reel packaging, while its absence denotes tray or tube packaging. Confirm the specific firmware revision required for the application. Ensure the selected variant matches the necessary temperature grade and interface protocol before procurement.

Selection Notes

Select this model for designs requiring I2C connectivity and support for up to 144 sensor nodes. Choose the AMT variant for the -40°C to +85°C temperature range. Consider the SPI variant if higher data rates or additional key arrays are needed. Verify sensor stack-up compatibility with Microchip guidelines.

Part Context

This component belongs to the mXT144UD-AMT/mXT144UD-AMB family within the maXTouch series. It utilizes patented capacitive sensing technology and is optimized for automotive environments. The device integrates advanced algorithms for gesture recognition and touch suppression to enhance user experience in challenging conditions.

Replacement Considerations

Direct replacements include other parts within the mXT144UD family, such as the SPI variant ATMXT144UD-AMTSPIVA1, provided interface differences are accommodated. Cross-family upgrades may require firmware and hardware redesign due to node count and pinout variations.

FAQ

What is the maximum number of concurrent touches supported?

The device supports tracking up to 10 concurrent touches in real time.

Does this controller support self-capacitance measurements?

Yes, it supports both mutual and self-capacitance measurements to augment touch detection reliability.

What is the purpose of the SYNC pin?

The SYNC pin allows synchronization with display refresh timing to reduce visual artifacts.