ATMXT144UD-AMTRSPIVA1

Overview

The ATMXT144UD-AMTRSPIVA1 is a maXTouch touchscreen controller from Microchip Technology, designed for automotive applications. It features a charge-transfer acquisition engine supporting up to 144 nodes, enabling tracking of up to 10 concurrent touches with an initial latency under 12 ms and a typical report rate exceeding 70 Hz. The device operates on a 3.3V nominal supply and supports SPI slave communication at 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 multi-touch sensing.
• Includes gesture reporting for one-touch and two-touch inputs.
• Features moisture compensation and noise suppression for robust operation.
• AEC-Q100 qualified and developed using Automotive SPICE Level 3 processes.

Applications

• Automotive infotainment systems
• Vehicle instrument clusters
• Touchscreen displays with glass or PET front panels

Procurement Notes

Verify the 'R' suffix indicates tape and reel packaging rather than standard tray or tube formats. Confirm that the specific ordering code matches the required SPI interface variant and Grade 3 temperature rating (-40°C to +85°C). Ensure compatibility with the host system's SPI clock speed limits.

Selection Notes

Select this part when SPI connectivity is preferred over I2C for higher bandwidth requirements. The SPI variant uniquely supports configurable mutual capacitance sensor keys. Ensure the design accommodates the 56-pin VQFN footprint and provides necessary voltage rails for AVdd, VDD, and XVdd.

Part Context

This component belongs to the mXT144UD family, which includes both I2C and SPI variants. The 'T' designation specifies the -40°C to +85°C operating range, while 'AMB' denotes the extended -40°C to +105°C grade. The 'R' suffix specifically identifies the tape and reel packaging option for automated assembly.

Replacement Considerations

Direct functional substitutes include other SPI variants within the mXT144UD series, such as ATMXT144UD-AMTSPIVA1, provided the packaging difference is managed. Cross-family replacements require verification of node count and interface compatibility.