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See Technical Specifications

AT42QT1070-MMHR

Capacitive Touch Buttons 20-VQFN (3x3)

Manufacturer:

MICROCHIP
Mfr.Part #:

AT42QT1070-MMHR
Datasheet:

AT42QT1070-MMHR Datasheet (PDF)
Package/Case:

20-VQFN (3x3)
Product Type:

Capacitive Touch Sensors
Lifecycle:

Active
EDA/CAD Models:

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AT42QT1070-MMHR General Description

The AT42QT1070 (QT1070) is a digital burst mode charge-transfer capacitive sensor driver. The device can sense from one to seven keys, dependent on mode.

The QT1070 has the optimized architecture where no external components are required and only 1-pin per channel. It includes all signal processing functions necessary to provide stable sensing under a wide variety of changing conditions, and the outputs are fully debounced.

The QT1070 modulates its bursts in a spread-spectrum fashion in order to heavily suppress the effects of external noise, and to suppress RF emissions. The QT1070 use a dual-pulse method of acquisition. This provides greater noise immunity and eliminates the need for external sampling capacitors, allowing touch sensing using a single pin.

Key Features

Comms mode
Standalone mode
Comms mode: 1 – 7 keys (or 1 – 6 keys plus a Guard Channel)
Standalone mode: 1 – 4 keys plus a fixed Guard Channel on key 0
Number of I/O Lines in Standalone mode: 5 outputs
Technology: Patented spread-spectrum charge-transfer
Key Outline Sizes: 6 mm x 6 mm or larger (panel thickness dependent); widely different sizes and shapes possible
PCB Layers Required: One
Electrode Materials: Etched copper; Silver; Carbon; Indium Tin Oxide (ITO)
Panel Materials: Plastic; Glass; Composites; Painted surfaces (low particle density metallic paints possible
Panel Thickness: Up to 10 mm glass; Up to 5 mm plastic (electrode size dependent)
Comms mode: individually settable via simple commands over I2C-compatible interface
Standalone mode: settings are fixed
I2C -compatible slave mode (400 kHz)
Discrete detection outputs
Signal Processing:
Self-calibration
Auto drift compensation
Noise filtering
Adjacent Key Suppression® (AKS®) – up to three groups possible
Power Supply: 1.8 V – 5.5 V
14-pin SOIC RoHS compliant IC
20-pin VQFN RoHS compliant IC