QT160-ASG

Overview

The Microchip Technology QT160-ASG is a 6-channel digital charge-transfer capacitive touch sensor IC. It operates on a single 3V to 5.5V supply with a typical current consumption of 5mA. The device features six independent channels, each requiring only one external sample capacitor (Cs) ranging from 10nF to 47nF. It utilizes a 14-bit switched-capacitor ADC and includes an internal 10MHz oscillator. Key specifications include active-high outputs capable of sourcing 1mA and sinking 5mA, a fixed detection integrator count of 3, and strap-selectable Max On-Duration timeouts of 10s, 60s, or infinite. The component supports toggle mode for on/off control and offers Adjacent Key Suppression (AKS).

Feature Summary

• Charge-transfer sensing technology enabling projection through various dielectrics.
• Six independent channels with per-channel sensitivity adjustment via external capacitors.
• Adjacent Key Suppression (AKS) to prevent false triggers from large fingers or water films.
• Continuous self-calibration with asymmetric drift compensation algorithms.

Applications

• Instrument panels and appliance controls
• Gaming machines and security systems
• Pointing devices and PC peripherals

Procurement Notes

Verify the specific ordering suffix ASG confirms the lead-free package variant and the -40°C to +105°C industrial temperature range. Confirm the package type matches the design requirements, as pinouts differ between DIP and SOIC configurations. Ensure option pins are strapped correctly during assembly to define output modes and timeout durations.

Selection Notes

Select this component for applications requiring up to six independent touch inputs without complex microcontroller processing. Evaluate the need for AKS functionality, which is exclusive to the QT160 variant compared to the QT161. Consider the power supply stability, as the device derives internal references from Vdd and may experience sensitivity shifts under heavy load conditions.

Part Context

The QT160-ASG belongs to the QProx QT160/QT161 family of charge-transfer sensor ICs. This series is designed specifically for human-machine interfaces where mechanical switches are replaced by capacitive sensors. The ASG suffix denotes the lead-free version of the component, adhering to environmental compliance standards while maintaining the same electrical characteristics as standard variants.

Replacement Considerations

The QT161 serves as a functional substitute lacking the Adjacent Key Suppression feature. Verify that the absence of AKS does not impact the application's reliability regarding closely spaced keys or wet environments before substituting.