QT111-IS

Overview

The Microchip Technology QT111-IS is a capacitive touch sensor IC from the QProx family, designed for applications requiring extended recalibration timeouts. It features an 8-pin SOIC surface-mount package and operates within a supply voltage range of 2.5V to 5.5V. The device draws a typical supply current of 26µA and supports a working temperature range of -40°C to +85°C. It provides one channel with up to 14-bit resolution and includes proximity detection capabilities.

Feature Summary

• Extended recalibration timeouts allow for continuous touch sensing without automatic reset, suitable for long-duration interactions.
• Capacitive touch and proximity detection functionality integrated into a single-channel interface.
• Low power consumption design optimized for battery-operated or energy-efficient systems.

Applications

• Hand-on-joystick sensors in industrial controls
• Dead-man switches requiring constant activation
• Machine tool and process control interfaces

Procurement Notes

Verify component authenticity through authorized distributors as the part status is discontinued. Confirm package marking 'QT1 Y' for the SOIC variant. Check RoHS compliance status against specific manufacturing dates. Ensure ordering suffixes match required output configurations.

Selection Notes

Select this model when prolonged touch duration is necessary without recalibration interference. Compare with QT110 for standard timeout requirements or QT112 for faster response speeds. Evaluate power budget constraints given the 26µA typical current draw. Consider environmental operating limits for extreme temperature deployments.

Part Context

Part of the QProx series focusing on proximity and touch sensing. Shares architecture with QT110 but modifies timeout parameters. Superseded by newer generations in some product lines. Maintains compatibility with existing QTouch/QProx design methodologies.

Replacement Considerations

Public confirmed substitute part numbers are not available in verified documentation. Consult manufacturer obsolescence notices for potential migration paths to newer sensor ICs.

FAQ

What distinguishes the QT111 from the QT110?

The QT111 offers extended recalibration timeouts of 5 minutes and infinity, whereas the QT110 has shorter default timeouts.

How does the infinite timeout mode affect drift compensation?

Drift compensation is suspended during active detection in infinite timeout mode; substantial parameter drift may cause the sensor to stick on until power is cycled.

What is the package marking for the QT111-IS?

The SOIC package is marked 'QT1 Y', while DIP packages are marked 'QT111'.