AT42QT4160-MU

Overview

The AT42QT4160 is a capacitive touchscreen controller utilizing the patented QField transverse charge-transfer technology. Designed for single-layer sensor elements, it supports screens up to 4.8 inches diagonal. The IC integrates self-calibration, auto drift compensation, and noise filtering to ensure stable sensing across varying environmental conditions. It operates on a supply voltage of 1.8V to 5.5V and features an I²C-compatible slave interface supporting both 100 kHz and 400 kHz speeds. The device is housed in a 32-pin 5 x 5 mm MLF package.

Feature Summary

• QField Technology: Patented spread-spectrum charge-transfer method optimized for one-layer sensor designs.
• Panel Compatibility: Supports plastic, glass (1-2mm), composites, and painted surfaces with adjacent grounded metal.
• Signal Processing: Includes self-calibration, automatic drift compensation, and noise filtering.
• Interface: I²C-compatible slave mode with address select pin (A0) and CHANGE output.

Applications

• Mobile electronics
• Terminals
• Appliances

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current catalog to confirm package type and tape/reel specifications. Confirm RoHS compliance status directly from the official datasheet or product change notifications. Ensure the component source is an authorized distributor to guarantee authenticity and traceability.

Selection Notes

Select this IC for applications requiring a single-layer PCB touch interface with minimal external components. It is suitable for panels up to 4.8 inches diagonal. Consider the 1.8V to 5.5V operating range for power supply design. Verify that the panel material thickness falls within the specified limits for glass (1-2 mm) or plastic (0.5-1.5 mm).

Part Context

The AT42QT4160 belongs to Atmel's QField family of capacitive touch controllers. It employs the QT™ acquisition method to sense electrical charge changes between X and Y electrode elements. This controller allows for simple circuit construction on single-sided PCB materials like CEM-1 or FR1, reducing overall system cost and complexity compared to multi-layer solutions.

Replacement Considerations

Consult Microchip Technology for verified cross-reference part numbers. Ensure any substitute maintains compatibility with the QField transverse charge-transfer architecture and I²C communication protocol.