QT320-IS

Overview

The QT320-IS is a two-channel digital advanced capacitive sensor IC from Microchip Technology, utilizing the charge-transfer (QT) sensing method. It operates on a supply voltage range of 1.8V to 5V with a typical current drain of 60µA. The device features an onboard EEPROM for user-defined cloning of sensing behaviors, including variable gain via sampling capacitor selection, selectable output polarities, and independent threshold and hysteresis settings per channel. It includes a HeartBeat health indicator and supports toggle or normal mode outputs. The component is housed in an 8-pin DIP package and is rated for an industrial temperature range of -40°C to +85°C.

Feature Summary

• Two-channel digital burst mode charge-transfer sensing capable of projecting fields through various dielectrics
• User-programmable internal EEPROM allows cloning of unique setups for each channel independently
• Continuous autocalibration eliminates the need for manual adjustments during operation
• Integrated HeartBeat signal provides continuous health monitoring of the sensor IC

Applications

• Computer peripherals and pointing devices
• Appliance control panels and light switches
• Security systems and access control interfaces
• Industrial control panels and entertainment devices

Procurement Notes

Verify that the specific suffix 'IS' corresponds to the industrial temperature grade (-40°C to +85°C) as defined by the manufacturer's official documentation. Confirm the package type matches the required 8-pin DIP configuration for your PCB layout. Ensure that the cloning process requirements are understood if pre-cloned units are not utilized, as this affects production integration.

Selection Notes

Select the QT320-IS when a robust, low-power solution for up to two touch inputs is required. This model is suitable for applications needing high immunity to environmental drift and EMI due to its charge-transfer architecture. Consider the external capacitor requirements and electrode design constraints, as sensitivity is heavily influenced by the Cs value and Cx load. Verify that the available GPIOs can accommodate the serial cloning interface if field programming is necessary.

Part Context

The QT320 belongs to the QPROX family of advanced capacitive sensors developed by Quantum Research Group and distributed by Microchip Technology. It represents a shift from analog capacitive solutions to fully digital, self-calibrating systems. The device is designed to replace mechanical switches in human-machine interfaces, offering superior reliability and design flexibility through its programmable nature and ability to sense through thick overlays.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Designers should consult official Microchip documentation for cross-reference information or equivalent products within the QPROX portfolio.