ATMXT641TD-ABVA1

Overview

The ATMXT641TD-ABVA1 is an automotive-grade capacitive touchscreen controller from Microchip Technology, operating within a –40°C to +105°C temperature range. It supports up to 32 X and 20 Y lines for a maximum of 640 nodes. The device features I²C interfaces supporting speeds up to 3.4 MHz and SPI up to 8 MHz. Power supplies include nominal 3.3 V for digital, I/O, and analog sections, with an internal voltage pump generating 6.6 V for the X line drive. It is housed in a 100-pin TQFP package measuring 14 × 14 × 1 mm.

Feature Summary

• AEC-Q100 qualified and developed using Automotive SPICE Level 3 certified processes.
• Supports up to 16 concurrent touches with real-time tracking and gesture reporting.
• Integrated noise suppression handling up to 240 Vpp ambient noise between 1 Hz and 1 kHz.
• Includes on-chip algorithms for lens bending, palm recovery, and adjacent key suppression.

Applications

• Automotive infotainment systems requiring CISPR-25 compliance.
• Displays utilizing TFT, IPS, or OLED technologies with on-cell or touch-on configurations.
• Systems requiring glove operation support up to 5 mm thickness.
• Applications needing moisture compensation for condensation or water drops up to 22 mm diameter.

Procurement Notes

Verify the specific ordering suffix against the manufacturer's Product Identification System documentation. Confirm that the 'B' suffix corresponds to the Grade 2 temperature range (–40°C to +105°C) and check if the 'V' indicates a specific tape and reel option or sample type as defined in the official datasheet.

Selection Notes

Select this component when an extended industrial/automotive temperature range up to +105°C is required. Ensure the host system can accommodate the 100-pin TQFP footprint. Verify that the application benefits from the integrated hover detection and advanced noise rejection capabilities provided by the maXTouch Adaptive Sensing technology.

Part Context

This part belongs to the mXT641TD-A family of maXTouch controllers. It shares core sensing engine and node architecture with the mXT641TD-AT variant, differing primarily in the operating temperature grade. The AB designation specifically denotes the wider thermal operating window suitable for harsher automotive environments.

Replacement Considerations

The mXT641TD-AT serves as a functional alternative if the application operates strictly within the –40°C to +85°C range. Both devices share identical pinouts, interface protocols, and software configuration requirements, allowing for potential hardware compatibility if thermal constraints permit.

FAQ

What is the maximum number of concurrent touches supported?

The controller supports up to 16 concurrent touches tracked in real time.

Does the device support glove operation?

Yes, it supports single-finger glove touches up to 5 mm thickness and multiple-finger glove touches up to 1.5 mm thickness, subject to stack-up design.

How does the device handle ambient noise?

It employs noise suppression technology capable of combating up to 240 Vpp sinusoidal waveform noise between 1 Hz and 1 kHz, and up to 20 Vpp between 1 kHz and 1 MHz.