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AT42QT2120-XU

MCHPAT42QT2120-XU

Microchip Technology
Capacitive Touch Buttons, Slider, Wheel 20-TSSOP
Active518 in stock
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Overview

The AT42QT2120-XU is a highly versatile capacitive touch controller capable of managing up to 12 individual keys, or a mix of keys and a touch slider or wheel. It utilizes patented QTouchADC charge-transfer technology to provide robust detection with automatic self-calibration and drift compensation. Operating across a wide 1.8V to 5.5V supply range, it communicates via I2C and includes 10 integrated LED driver channels for visual feedback.

Why Choose This Part

It features Adjacent Key Suppression (AKS) to ensure only the intended key is registered in dense layouts. The spread-spectrum acquisition provides high immunity to electrical noise, while the low-power mode reduces current consumption to just 1uA when idle.

Applications

Consumer Interface Panels
Ideal for kitchen appliances or home electronics requiring durable, waterproof touch buttons and circular wheels for parameter adjustment.
Proximity Sensing
Can be configured for long-range proximity detection to wake up a system or activate backlighting when a hand approaches.
Industrial Control Terminals
Used in rugged environments where mechanical switches fail, benefiting from Adjacent Key Suppression (AKS) to prevent false triggers.
LED-Integrated Keypads
Simplifies design by using the 10 onboard LED drivers to provide direct illumination of the touch surface without external transistors.

Key Specifications

Type Buttons, Slider, Wheel
Interface I2C
Mounting Type Surface Mount
Package / Case 20-TSSOP (0.173", 4.40mm Width)
Number of Inputs Up to 12
Voltage - Supply 1.8V ~ 5.5V
LED Driver Channels Up to 10
Proximity Detection Yes
Operating Temperature -40degC ~ 85degC
Supplier Device Package 20-TSSOP

Getting Started

Connect the IC to a host microcontroller via the I2C interface and utilize the Microchip QTouch Library for rapid firmware integration. Evaluation can be performed using the AT42QT2120-XPRO extension board which connects directly to Atmel Xplained Pro development platforms.

Also Consider

CapSense Express CY8CMBR3116 IFXInfineon Technologies - Offers up to 16 capacitive sensing inputs and SmartSense auto-tuning which eliminates the need for manual sensitivity calibration.
CAP1188 MCHPMicrochip Technology - Provides 8 touch inputs with integrated LED drivers and support for both I2C and SPI interfaces for design flexibility.
FDC2214 TITexas Instruments - A high-resolution noise-immune capacitance-to-digital converter suitable for ultra-high sensitivity proximity and liquid level sensing.

Categories

Microcontrollers > Microchip Consumer Electronics > Touch & Gesture Control