QT1081-ISG

Overview

The AT42QT1081-ISG is an eight-key capacitive touch sensor IC based on Quantum's patented QTouch charge-transfer technology. It operates within a supply voltage range of 2.8V to 5.0V and features self-calibration, auto drift compensation, and noise filtering. The device supports one-per-key or binary coded output modes and includes Adjacent Key Suppression (AKS). It is housed in a 32-pin 5mm x 5mm QFN package and is designed for low power consumption with configurable Low Power mode options.

Feature Summary

• Patented spread-spectrum charge-transfer sensing technology for robust operation
• Integrated self-calibration and automatic drift compensation mechanisms
• Configurable Adjacent Key Suppression (AKS) to prevent false multi-key detection
• Dual output modes supporting parallel discrete pins or binary encoded signals

Applications

• Portable consumer electronics devices
• Domestic appliances and audio/video equipment controls
• PC peripherals and office equipment interfaces

Procurement Notes

Verify the specific suffix ISG corresponds to the required industrial temperature range (-40°C to +85°C) and 32-QFN package configuration. Confirm that the ordering documentation matches the revision 1 chip specifications provided in the official datasheet. Ensure compatibility with the intended PCB substrate and electrode materials before finalizing procurement orders.

Selection Notes

Select this component when designing cost-sensitive applications requiring up to eight independent touch inputs. Consider the simplified mode option if minimizing external resistor count is a priority. Evaluate the Low Power mode requirements against the application's response time constraints, as lower current draw increases detection latency. Ensure the panel thickness and electrode layout adhere to the specified minimum spacing guidelines.

Part Context

The QT1081 serves as a direct replacement for the QT1080, offering improved sensitivity and reduced power consumption. It eliminates the need for channel-specific resistors found in previous generations. This iteration is optimized for mobile and consumer electronics where board space and energy efficiency are critical design factors.

Replacement Considerations

The QT1080 is a confirmed substitute part number. Verify pinout compatibility and ensure that any existing circuit designs account for the elimination of Rs resistors and the adjusted Cs capacitor values required for optimal sensitivity.