ATMXT144UD-AMTSPIVA1

Overview

The ATMXT144UD-AMTSPIVA1 is a maXTouch touchscreen controller from Microchip Technology, designed for automotive applications. It supports up to 144 nodes and enables multi-touch tracking of up to 10 concurrent touches with an initial latency under 12 ms. The device operates on a 3.3V nominal supply and features an SPI slave interface with speeds up to 8 MHz. Packaged in a 56-pin VQFN (7x7 mm), it functions within a temperature range of -40°C to +85°C.

Feature Summary

• Supports up to 144 nodes with 12 X and 24 Y lines for touch sensor arrays
• Tracks up to 10 concurrent touches with <12 ms initial latency
• SPI slave interface operating at frequencies up to 8 MHz
• AEC-Q100 qualified and developed using Automotive SPICE Level 3 processes

Applications

• Automotive infotainment systems
• Vehicle instrument clusters
• On-cell or touch-on display integration for TFT, LCD, and OLED panels

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet to confirm package type and temperature grade. Confirm availability through authorized distribution channels as stock levels fluctuate. Ensure the selected variant matches the required communication protocol and environmental specifications for the target application.

Selection Notes

Select this model when an SPI interface is preferred over I2C for higher bandwidth requirements. The 'T' suffix indicates Grade 3 operation (-40°C to +85°C). Ensure the system design accommodates the 56-pin VQFN footprint and provides the necessary 3.3V digital and analog power supplies. Verify that the host processor supports the required SPI clock speed and interrupt handling.

Part Context

This component belongs to the mXT144UD-AMT/AMB family of capacitive sensing controllers. It utilizes a charge-transfer acquisition engine and patented capacitive sensing technology. The device integrates both mutual and self-capacitance measurements to ensure robust touch detection and noise suppression in electrically noisy environments.

Replacement Considerations

The ATMXT144UD-AMBI2CVA1 serves as a functional alternative if an I2C interface is acceptable instead of SPI. Both variants share the same node count and package but differ in communication protocol. Verify pin compatibility and firmware configuration differences before substitution.