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Product Detailed Parameters
- Description：IC TOUCH SENSOR 12CH 20VQFN
- Series：QTouch™
- Mfr：Microchip Technology
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：Buttons, Slider, Wheel
- Proximity Detection：Yes
- Number of Inputs：Up to 12
- LED Driver Channels：Up to 10
- Interface：I2C
- Resolution：-
- Voltage - Supply：1.8V ~ 5.5V
- Current - Supply：-
- Operating Temperature：-40°C ~ 85°C
- Mounting Type：Surface Mount
- Package / Case：20-VFQFN Exposed Pad
- Supplier Device Package：20-VQFN (3x3)
- Grade：-
- Qualification：-
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Overview
The AT42QT2120-MMHR is a QTouchADC capacitance touch sensor IC manufactured by Microchip Technology. It supports up to 12 keys in communications mode or 5 keys in standalone mode, with provisions for slider and wheel configurations. The device operates on a 1.8 V to 5.5 V supply and features an I2C interface with a fixed slave address of 0x1C. It utilizes patented spread-spectrum technology for noise immunity and includes signal processing functions such as self-calibration, auto drift compensation, and Adjacent Key Suppression (AKS). The component is housed in a 20-pad VQFN package.
Feature Summary
- Patented QTouchADC charge-transfer technology providing high noise immunity without external sampling capacitors.
- Integrated signal processing including self-calibration, auto drift compensation, and Adjacent Key Suppression (AKS) for reliable detection.
- Dual operational modes: Communications mode for configurable settings via I2C, and Standalone mode for fixed firmware operation.
- Supports proximity sensing and guard channels to prevent false triggering from adjacent metal or hand coverage.
Applications
- Consumer electronics requiring multi-key touch interfaces
- Appliances with slider or rotary wheel controls
- Industrial panels requiring robust noise rejection
Procurement Notes
Verify the MMHR suffix indicates tape and reel packaging when sourcing. Confirm the specific revision level against the latest datasheet to ensure compatibility with existing designs. Check RoHS compliance status as manufacturing sites may change over time. Ensure the host system supports the fixed I2C address 0x1C.
Selection Notes
Select this model for applications requiring up to 12 independent touch inputs or combined slider/wheel functionality. Choose Communications mode if dynamic configuration of thresholds and sensitivity is required. Use Standalone mode for simpler designs where I2C communication overhead is undesirable. Ensure panel thickness and electrode materials align with the specified substrate constraints.
Part Context
This component belongs to the AT42QT2120 family of QTouchADC sensors. It shares core signal processing capabilities with other variants in the series but differs in package type and output configuration options. The MMHR suffix specifically denotes the VQFN package variant supplied in tape and reel format for automated assembly.
Replacement Considerations
Direct pin-to-pin replacements within the same package are limited. Consider the AT42QT2120-XU for TSSOP packaging or other AT42QT series devices if channel count or interface requirements differ. Verify firmware compatibility if migrating between different QTouch controller families.
