QT150-D

Overview

The QT150-D is a 5-channel capacitive touch sensor IC from Microchip Technology, utilizing QTouch charge-transfer technology. It operates on a single 3V to 5.5V supply with a typical current consumption of 5mA. The device features five independent sensing channels (SNS1A/B through SNS5A/B) and corresponding logic outputs (OUT1-OUT5). It includes an active-low reset pin (/RST), synchronization capability via the SYNC pin, and configuration options for output drive type (OC) and adjacent key suppression (AKS). The component is available in a 28-pin DIP package and supports an operating temperature range of 0°C to +70°C.

Feature Summary

• Supports projection of proximity fields through various dielectric materials including glass, plastic, stone, ceramic, and wood.
• Features patent-pending Adjacent Key Suppression (AKS) to prevent false detections from large fingers or water films on tightly spaced keys.
• Includes continuous self-calibration and drift compensation algorithms to maintain stability against environmental changes and component aging.
• Provides a synchronization pin for multi-chip coordination or external noise line synchronization.

Applications

• Instrument panels
• Gaming machines
• Access systems
• Pointing devices
• Appliance controls

Procurement Notes

Verify the specific ordering suffix to confirm the package style and temperature rating. The 'D' suffix indicates a standard commercial temperature range (0°C to +70°C) and typically corresponds to the DIP-28 package. Ensure the design accounts for the distinct pinout differences between DIP and SSOP packages to prevent wiring errors. Confirm that the required channel count matches the five-channel capability of this specific model variant.

Selection Notes

Select the QT150-D when five independent sensing channels are required for human interface applications. This model is suitable for designs needing robust signal processing against impulse noise and drift. Consider the AKS feature if keys are closely spaced. Ensure the application environment falls within the specified commercial temperature range; otherwise, evaluate the industrial grade variants. Verify that the power supply voltage remains within the 3V to 5.5V operational limits.

Part Context

The QT150-D belongs to the QProx QT140/QT150 family of digital charge-transfer sensor ICs. These devices are designed specifically for touch controls and include all necessary hardware and signal processing functions. The family shares similar internal architectures but differs in channel count and packaging options. The QT150 specifically provides five channels, whereas the QT140 provides four.

Replacement Considerations

Public confirmed substitute part numbers: QT140-D (for 4-channel requirement).