AT42QT1070-SSUR

Overview

The AT42QT1070-SSUR is a seven-channel QTouch capacitive sensor IC manufactured by Microchip Technology. It utilizes patented spread-spectrum charge-transfer technology to detect touch inputs across one to seven keys. The device supports both I2C-compatible communication mode and standalone operation with discrete outputs. It operates on a supply voltage ranging from 1.8 V to 5.5 V and features integrated signal processing including self-calibration, auto drift compensation, noise filtering, and Adjacent Key Suppression (AKS). The component is housed in a 14-pin SOIC package and functions within an operating temperature range of -40°C to +85°C.

Feature Summary

• Patented spread-spectrum charge-transfer technology for high noise immunity
• Configurable Comms and Standalone operational modes
• Integrated signal processing with self-calibration and drift compensation
• Supports up to three groups of Adjacent Key Suppression

Applications

• Consumer appliance control panels
• Industrial human-machine interfaces
• Medical device touch interfaces
• Home automation keypads

Procurement Notes

Verify the specific ordering suffix SSUR against the manufacturer's current datasheet to confirm the package type and tape/reel specifications. Ensure that the I2C address configuration matches the system requirements, as the default address is fixed. Confirm environmental compliance documentation is available for the intended deployment region.

Selection Notes

Select this component when a dedicated touch controller is required to offload processing from a main microcontroller. It is suitable for designs needing robust noise rejection in electrically noisy environments. Consider the standalone mode if I2C connectivity is unavailable or if discrete output signals are preferred for direct LED driving.

Part Context

This part belongs to the AT42QT1070 series of QTouch capacitive sensor drivers. It is designed to replace mechanical switches in modern electronic interfaces. The device integrates the necessary analog front-end and digital logic to provide stable sensing without requiring external sampling capacitors, simplifying the overall circuit design.

Replacement Considerations

Check for updated revisions within the AT42QT1070 family. Verify pin compatibility if substituting with other Microchip QTouch devices, noting differences in channel counts or package types such as VQFN variants.