AT42QT1070中文资料Touch Sensing/Turnkey Products数据手册Microchip规格书

描述 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.

特性 Features

• Configurations:
• Comms mode
• Standalone mode
• Number of Keys:
• 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)
• Key Sensitivity:
• Comms mode: individually settable via simple commands over I2C-compatible interface
• Standalone mode: settings are fixed
• Interface:
• 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
• Packages:
• 14-pin SOIC RoHS compliant IC
• 20-pin VQFN RoHS compliant IC

简介

AT42QT1070属于集成电路（IC）的传感器电容式触控。由制造生产的AT42QT1070传感器，电容式触控该系列产品提供操作电容式触摸感应传感器所需的模拟激励和测量资源，并以一种便于微控制器或类似器件使用的格式（例如 I2C 或 SPI 串行接口、UART 或简单的逻辑信号）来传递由此产生的信息。这些器件常用于人机界面应用。