QT310-IS

Overview

The QT310-IS is a single-channel digital advanced capacitive sensor IC from Microchip Technology, operating within a temperature range of -40°C to +85°C. It utilizes the charge-transfer (QT) method for proximity, touch, and fluid level sensing. The device features full autocal capability, internal EEPROM storage for user setups and calibration data, and variable drift compensation. Key electrical parameters include a supply voltage range of 1.8V to 5V DC and an operating frequency of approximately 500kHz. Configuration is achieved via a serial cloning process, allowing programmable burst rates, output polarity, and toggle modes without external analog components.

Feature Summary

• Implements direct-to-digital capacitance acquisition using a charge-transfer method with internal signal processing to reject impulse noise.
• Supports user-programmable configurations via a serial cloning process that stores setups in internal EEPROM.
• Includes HeartBeat health indicator functionality and sync pins for daisy-chaining or noise suppression.
• Features push-pull CMOS output with selectable polarity and optional toggle mode capabilities.

Applications

• Material detection and industrial panels
• Toys, games, and appliance controls
• Access controls and security systems
• Microswitch replacement and fluid level sensors

Procurement Notes

Verify the specific IS suffix indicates the industrial temperature grade (-40°C to +85°C) compared to standard variants. Confirm the package type matches the required 8-pin DIP/SOIC/TSSOP configuration. Ensure the cloning tool or software is available for programming the internal EEPROM before deployment. Check for RoHS compliance status if environmental regulations apply to the final assembly.

Selection Notes

Select the QT310-IS when an industrial temperature range is required for the capacitive sensing application. Consider the single-channel limitation if multiple independent sensors are needed, as daisy-chaining may be necessary for multi-point detection. Evaluate the electrode design requirements, specifically the need for virtual capacitive grounds or shielding to prevent walk-by interference. Ensure the host system supports the serial cloning interface for production configuration.

Part Context

The QT310 is part of the QPROX family of advanced sensor ICs designed for human-machine interfaces and material sensing. It replaces mechanical switches by detecting changes in capacitance through dielectric materials. The device integrates all necessary hardware and signal processing, requiring only minimal external passive components for operation.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing electrode designs and cloning infrastructure when considering alternative capacitive sensor ICs.