QT160-AS

Overview

The Microchip Technology QT160-AS is a 6-channel digital charge-transfer capacitive touch sensor IC. It operates on a single supply voltage ranging from 3V to 5.5V with a typical current consumption of 5mA. The device features six independent channels capable of detecting touch or near-proximity through various dielectric materials. It includes an internal 14-bit switched capacitor ADC and supports strap-selectable toggle mode for on/off control. The component offers adjacent key suppression (AKS) functionality, drift compensation algorithms, and configurable max on-duration timeouts of 10s, 60s, or infinite. It utilizes a 10MHz oscillator clock and provides active-high logic outputs.

Feature Summary

• Six independent sensing channels with individual sensitivity tuning via external sample capacitors
• Adjacent Key Suppression (AKS) feature prevents false triggers from large fingers or water films on tightly spaced keys
• Continuous self-calibration with asymmetric drift compensation ensures stable operation under varying environmental conditions
• Strap-selectable toggle mode allows the sensor to function as a latching on/off switch

Applications

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

Procurement Notes

Verify the specific suffix 'AS' corresponds to the extended temperature range of -40°C to +105°C when sourcing. Confirm package type availability, as pinouts differ between DIP-28 and SSOP-28 variants. Ensure option pins are strapped correctly during assembly to prevent excessive power draw. Check datasheet for exact ordering information regarding the specific revision level.

Selection Notes

Select this component for applications requiring robust capacitive sensing without complex microcontroller integration. The QT160-AS is suitable where adjacent key interference is a concern due to its built-in AKS feature. Consider the fixed response time and output drive capabilities when designing interface circuits. Ensure the application environment falls within the specified operating temperature range for the AS suffix variant.

Part Context

The QT160-AS belongs to the QProx QT160/QT161 family of charge-transfer sensors. It is distinct from the QT161 model by including the Adjacent Key Suppression feature. This series is designed for human-machine interfaces replacing mechanical switches. The device integrates all necessary signal processing hardware, eliminating the need for external digital controllers for basic touch detection.

Replacement Considerations

Public confirmed substitute part numbers: None identified in verified documentation.