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Product Detailed Parameters
- Description：IC TOUCH SENSOR 11KEY 32QFN
- Series：QTouch™
- Mfr：Microchip Technology
- Package：Tape & Reel (TR)
- Type：Buttons
- Proximity Detection：No
- Number of Inputs：Up to 11
- LED Driver Channels：Up to 7
- Interface：SPI
- Resolution：-
- Voltage - Supply：1.8V ~ 5.5V
- Current - Supply：12mA
- Operating Temperature：-40°C ~ 85°C
- Mounting Type：Surface Mount
- Package / Case：32-VFQFN Exposed Pad
- Supplier Device Package：32-VQFN (5x5)
- Grade：-
- Qualification：-
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Overview
The AT42QT1111-MU is a digital burst mode charge-transfer capacitive sensor driver designed for touch-key applications. It supports up to 11 QTouch channels and operates on a 1.8 V to 5.5 V supply. The device features full-duplex SPI slave communication at frequencies up to 750 kHz, alongside discrete detect outputs in 7-key configurations. It utilizes patented spread-spectrum technology for noise suppression and includes self-calibration with auto drift compensation. The component is housed in a 32-pin 5 × 5 mm QFN package.
Feature Summary
- Patented spread-spectrum charge-transfer technology suppresses external noise and RF emissions.
- Integrated signal processing provides self-calibration, auto drift compensation, and noise filtering.
- Configurable discrete detect outputs enable standalone operation without host microcontroller intervention.
- Supports both internal timed triggering and external synchronization via the SYNC pin.
Applications
- Consumer electronics such as televisions and media players
- Industrial control panels requiring robust touch interfaces
- Appliances utilizing plastic or glass panel overlays
Procurement Notes
Verify the specific ordering suffix against manufacturer documentation to confirm package type and compliance status. Ensure that the procurement source provides valid RoHS certification data. Confirm that the component matches the exact part number to avoid functional discrepancies related to firmware or hardware revisions.
Selection Notes
Select this component when designing systems requiring up to 11 independent touch keys. Consider the 7-key configuration if discrete PWM outputs are needed for direct LED indication. Evaluate panel thickness and material compatibility, as these factors influence electrode design and sensitivity tuning requirements.
Part Context
This component belongs to the Atmel QTouch series of capacitive sensor drivers. It shares core architecture with the AT42QT1110 but offers distinct pinout and configuration options. The device represents a specialized solution for embedded touch sensing within Microchip's broader portfolio of interface and sensor technologies.
Replacement Considerations
The AT42QT1110 serves as a primary alternative within the same family. Verify pin compatibility and software register mapping before substitution. Note that the AT42QT1111-MU is listed as obsolete in some distributor catalogs; check current availability and lifecycle status carefully.
