QT220-ISSG

Overview

The QT220-ISSG is a two-channel digital charge-transfer touch sensor IC designed for human-machine interfaces. It operates on a single supply voltage ranging from 3.9V to 5.5V and features independent sensing channels with active-high outputs. The device supports low-power synchronization mode consuming approximately 90µA at 4V, or fast spread-spectrum mode drawing about 1.5mA. It includes built-in drift compensation, a six-sample consensus filter for noise rejection, and strap-selectable recalibration timeouts of 10s, 60s, or infinite. The component is housed in a 20-lead SSOP package.

Feature Summary

• Independent dual-channel sensing with per-channel sensitivity adjustment via sample capacitors
• Integrated drift compensation and consensus filtering to ensure stable operation under environmental changes
• Spread-spectrum modulation capability to minimize electromagnetic interference and emissions
• External synchronization support for noise suppression and coordinated multi-device operation

Applications

• Instrument panels
• Gaming machines
• Access systems
• Pointing devices
• Appliance controls

Procurement Notes

Verify the specific ordering suffix against official Microchip documentation to confirm temperature range and packaging details. Ensure compatibility with required interface resistors and capacitor values during design review. Confirm RoHS compliance status through current datasheets before finalizing procurement specifications.

Selection Notes

Select this component for applications requiring robust capacitive sensing through dielectric materials. Evaluate power consumption requirements to choose between slow sync mode or fast spread-spectrum mode. Consider electrode size and panel thickness when determining necessary sample capacitor values for optimal sensitivity balance.

Part Context

This part belongs to the QTouch family of self-contained digital sensor ICs developed by Quantum Research Group and distributed by Microchip Technology. These devices utilize proprietary charge-transfer signal processing techniques to provide reliable touch detection without complex external hardware.

Replacement Considerations

Consult official Microchip documentation for confirmed substitute part numbers. Verify pinout compatibility and functional equivalence before considering alternative components.