QT60168C-ASG

Overview

The QT60168C-ASG is a 16-key QMatrix touch sensor IC from Microchip Technology. It utilizes transverse charge-transfer technology to detect human touch on passive X-Y matrix electrodes through dielectric panels up to 5 cm thick. The device operates on a single +3V to +5V supply and features an SPI slave interface for host communication. It includes onboard EEPROM for setup storage, adaptive auto-calibration, and FMEA self-test diagnostics. The component is housed in a 32-pin lead-free TQFP package and supports operation across a temperature range of -40°C to +105°C.

Feature Summary

• Transverse charge-transfer sensing technology enabling detection through various dielectric materials
• Adaptive auto-calibration and drift compensation algorithms for robust performance in varying environments
• Integrated FMEA self-test and reporting diagnostics for critical application safety
• Spread-spectrum modulation for high noise immunity and reduced EMI

Applications

• Automotive control panels
• Machine tool interfaces
• ATM machine keypads
• Appliance controls
• Security keypans

Procurement Notes

Verify the specific suffix 'C' against official Microchip documentation to confirm its exact meaning regarding temperature grade or revision. Ensure the ordering code matches the 32-pin TQFP package requirement. Confirm RoHS compliance status directly with the manufacturer's current datasheet before procurement.

Selection Notes

Select this model for applications requiring up to 16 touch keys in a matrix configuration. It is suitable for environments subject to humidity, dirt, or vandalism due to its sealed panel capability. Ensure the host system supports SPI communication and can handle the required calibration timing. Verify that the panel thickness does not exceed the specified limits for reliable signal acquisition.

Part Context

The QT60168 is part of the QProx QMatrix family, designed specifically for digital burst mode charge-transfer sensing. It shares electrical characteristics with the QT60248, differing only in the maximum number of supported keys (16 vs 24). Both devices utilize the same 32-pin TQFP package and internal architecture for matrix scanning.

Replacement Considerations

The QT60248 is electrically identical but supports 24 keys instead of 16. If fewer than 16 keys are used, the QT60248 may serve as a functional substitute. No other direct substitutes are documented in the provided source material.