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Product Detailed Parameters
- Description：IC TOUCH SENSOR 12CH 20SOIC
- 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-SOIC (0.295", 7.50mm Width)
- Supplier Device Package：20-SOIC
- Grade：-
- Qualification：-
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Overview
The AT42QT2120-SUR 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 SUR suffix indicates the component is packaged in a 20-pin SOIC/TSSOP format.
Feature Summary
- Patented spread-spectrum QTouchADC charge-transfer technology for enhanced noise immunity
- Integrated signal processing including self-calibration, auto drift compensation, and noise filtering
- Supports both communications mode via I2C and standalone mode without host controller
- Includes Adjacent Key Suppression (AKS) technology to prevent false triggers on tightly spaced keys
Applications
- Consumer electronics requiring capacitive touch interfaces
- Industrial control panels needing robust sensing under varying conditions
- White goods and home appliances with plastic or glass overlays
- Medical devices requiring reliable touch input without mechanical switches
Procurement Notes
Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and temperature range. Ensure that the I2C bus voltage levels are compatible with the host microcontroller. Confirm RoHS compliance status through official datasheets before finalizing procurement specifications.
Selection Notes
Select this component when a solution supporting up to 12 independent touch inputs is required. Consider the standalone mode if I2C communication overhead is undesirable. Evaluate panel thickness and material constraints, as the device supports various substrates including glass and plastic up to specified limits. Ensure adequate spacing between keys to leverage the AKS feature effectively.
Part Context
The AT42QT2120 belongs to the QTouch family of capacitive touch sensor controllers from Microchip Technology. This series is designed to replace mechanical buttons and switches in modern electronic designs. The device integrates all necessary signal processing to provide stable sensing across diverse environmental conditions.
Replacement Considerations
Direct replacements within the same family include other AT42QT2120 variants with different package suffixes, such as AT42QT2120-MMH for VQFN packaging. Verify pin compatibility and firmware configuration requirements when substituting packages.
