QT100A-ISG

Overview

The QT100A-ISG is a single-channel capacitive touch sensor IC utilizing patented spread-spectrum charge-transfer technology. It operates within a supply voltage range of 2.0V to 5.5V, consuming 6.5µA at 2.0V in low power mode. The device features an active-high digital output and supports three run modes: Fast, Low Power, and Sync. It is available in a 6-pin WSON package with MSL3 rating. Key electrical parameters include a threshold differential of 13 counts, hysteresis of 3 counts, and a consensus filter length of 4 samples.

Feature Summary

• Patented spread-spectrum charge-transfer technology for stable sensing
• Self-calibration with automatic drift compensation and noise filtering
• Configurable run modes including Fast, Low Power, and external Sync synchronization
• HeartBeat health indicator superimposed on the output pin

Applications

• Control panels and consumer appliances
• Toys and lighting controls
• Mechanical switch or button replacement

Procurement Notes

Verify the specific ordering suffix ISG against the manufacturer's current datasheet to confirm the package type and moisture sensitivity level. Ensure the design accounts for the center pad grounding requirements if using the WSON variant. Confirm component availability status as legacy products may have limited production runs.

Selection Notes

Select this component for applications requiring a single touch input with minimal external components. Evaluate the required panel thickness and dielectric constant to determine the appropriate sample capacitor value. Consider the trade-off between response time and power consumption when choosing between Fast and Low Power modes.

Part Context

The QT100A is designed to replace the earlier QT100 model while offering reduced package thickness in the WSON version. It belongs to the QTouch family of sensors developed by Quantum Research Group (QRG), now part of Microchip Technology. The device integrates all necessary hardware for charge-transfer sensing without requiring complex external signal processing.

Replacement Considerations

The QT100A is the direct behavioral replacement for the QT100. When transitioning from the QT100 SOT-23-6 to the QT100A 6-WSON, ensure the PCB solder mask is widened under the center pad to prevent shorts.