AT42QT1244 Series

Catalog

24-KEY QMATRIX FMEA IEC/UL60730 TOUCH IC 32 VQFN 5X5X1MM T/R ROHS COMPLIANT: YES

Part	Interface	Voltage - Supply [Max]	Voltage - Supply [Min]	Type	Resolution	Current - Supply	Mounting Type	Operating Temperature [Min]	Operating Temperature [Max]	Number of Inputs [Max]	Package / Case	Supplier Device Package
Microchip Technology AT42QT1244-MUR	I2C	5 V	3 V	Buttons	10 b	6.6 mA	Surface Mount	-40 °C	105 ░C	24	32-VFQFN Exposed Pad	32-VQFN (5x5)
Microchip Technology AT42QT1244-AUR	I2C	5 V	3 V	Buttons	10 b	6.6 mA	Surface Mount	-40 °C	105 ░C	24	32-TQFP	32-TQFP (7x7)
Microchip Technology AT42QT1244-MU	I2C	5 V	3 V	Buttons	10 b	6.6 mA	Surface Mount	-40 °C	105 ░C	24	32-VFQFN Exposed Pad	32-VQFN (5x5)

Catalog

Key Features

• * Number of keys: Up to 24

• * Technology: Patented charge-transfer (transverse mode), with frequency hopping Key outline sizes: 6 mm × 6 mm or larger (panel thickness dependent); different sizes and shapes possible

• * Key spacings: 8 mm or wider, center to center (panel thickness dependent)

• * Electrode design: Two-part electrode shapes (drive-receive); wide variety of possible layouts

• * PCB Layers required: One layer (with jumpers), two layers (no jumpers)

• * Electrode materials: PCB, FPCB, silver or carbon on film, ITO on film

• * Panel materials: Plastic, glass, composites, painted surfaces (low particle density metallic paints possible)

• * Panel thickness: Up to 50 mm glass, 20 mm plastic (key size dependent)

• * Key sensitivity: Individually settable via simple commands over communication interface

• * Interface: I2C (please use AT42QT1245 for SPI)

• * Signal processing: Self-calibration, auto drift compensation, noise filtering, Adjacent Key

• Suppression® (AKS®) technology

• * FMEA compliant design features

• * UL approval

• * VDE compliance

• * For use in both class B and class C safety-critical products

• * Detects and Reports Key Failure

• * Power supply: +3 V to 5 V

• * 32-pin 7 × 7 mm TQFP RoHS compliant

• * 32-pin 5 × 5 mm QFN RoHS compliant

• * IEC/EN/UL60730 (Ed. 5.1) / IEC/EN 60335 (Ed. 5.2) compliant design features for use in both class B and class C safety-critical appliance products.

Description

The Microchip's AT42QT1244 and 1245 are a capacitive touch controllers with configurable 24-QTouch buttons. The Microchip QMatrix sensing algorithm (mutual capacitance) enables the user to achieve more buttons than there are pins because of this matrix layout. The device includes all signal processing functions necessary to provide stable sensing under a wide variety of changing conditions and frequencies. UL approval and VDE compliance IEC/EN 60730 (Ed. 5.1) / IEC/EN 60335 (Ed. 5.2) for use in both class B and class C safety-critical products. The AT42QT1244 connects via an I2C interface while the 42QT1245 features a slave SPI port.