基于Atmel的AT42QT1110容性触摸键驱动原理及应用方案
时间:02-22
来源:互联网
点击:
Atmel公司的 AT42QT1110是数字突发模式电荷传输(QT)型电容传感器驱动器,可以用于任何的触摸键应用. AT42QT1110所有的信号处理功能,可在各种变化的条件下提供稳定的检测.,输出完全是去抖动的,仅需几个外接元件就可工作.本文介绍AT42QT1110主要特性和典型的几种应用电路.
The AT42QT1110 (QT1110) is a digital burst mode charge-transfer (QT?) capacitive sensor driver designed for any touch-key applications.
The keys can be constructed in different shapes and sizes. Refer to the Touch Sensors Design Guide and Application Note QTAN0002, Secrets of a Successful QTouch? Design, for more information on construction and design methods (both downloadable from the Atmel? website).
The device includes all signal processing functions necessary to provide stable sensing under a wide variety of changing conditions, and the outputs are fully debounced. Only a few external parts are required for operation.
The QT1110 modulates its bursts in a spread-spectrum fashion in order to suppress heavily the effects of external noise, and to suppress RF emissions.
AT42QT1110主要特性:
? Sensor Keys:
– Up to 11 QTouch? channels
? Data Acquistion:
– Measurement of keys triggered either by a signal applied to the SYNC pin or at
regular intervals timed by the AT42QT1110s internal clock
Keys measured sequentially for better performance, or in parallel groups for faster operation
– Raw data for key touches can be read as a report over the SPI interface
? Discrete Outputs:
– Configurable “Detect” outputs indicating individual key touch (7-key mode)
? Device Setup:
– Device configuration can be stored in EEPROM
? Technology:
– Patented spread-spectrum charge-transfer (direct mode)
? Key Outline Sizes:
– 6 mm x 6 mm or larger (panel thickness dependent); widely different sizes and
shapes possible, including solid or ring shapes
? Key Spacings:
– 7 mm center to center or more (panel thickness dependent)
? Layers Required:
– One
? Electrode Materials:
– Etched copper, silver, carbon, Indium Tin Oxide (ITO)
? Electrode Substrates:
– PCB, FPCB, plastic films, glass
? Panel Materials:
– Plastic, glass, composites, painted surfaces (low particle density metallic paints
possible)
? Panel Thickness:
– Up to 10 mm glass, 5 mm plastic (electrode size dependent)
? Key Sensitivity:
– Individually settable via simple commands over serial interface
? Adjacent Key Suppression? (AKS?)
– Patented AKS technology to enable accurate key detection
? Interface:
– Full-duplex SPI slave mode (1.5 MHz), “change” pin, discrete detection outputs
? Moisture Tolerance Good
? Power:
– 3V ~ 5.5V
? Package:
– 32-pin 5 x 5 mm MLF RoHS compliant
– 32-pin 7 x 7 mm TQFP RoHS compliant
? Signal Processing:
– Self-calibration, auto drift compensation, noise filtering, AKS technology
AT42QT1110应用:
– Specific package qualified for automotive applications, such as radio, keyless
entry, electric windows and sat nav
![](../img/eep-analog/analog-3171n32xexrou42.jpg)
图1.AT42QT1110带检测输出和不用外接触发器的7键典型应用
![](../img/eep-analog/analog-3172tu0aseiwmmp.jpg)
图2.AT42QT1110不用外接触发器的11键典型应用
![](../img/eep-analog/analog-31735bep1nwfkii.jpg)
图3.AT42QT1110带外接触发器(SYNC模式)的10键典型应用
The AT42QT1110 (QT1110) is a digital burst mode charge-transfer (QT?) capacitive sensor driver designed for any touch-key applications.
The keys can be constructed in different shapes and sizes. Refer to the Touch Sensors Design Guide and Application Note QTAN0002, Secrets of a Successful QTouch? Design, for more information on construction and design methods (both downloadable from the Atmel? website).
The device includes all signal processing functions necessary to provide stable sensing under a wide variety of changing conditions, and the outputs are fully debounced. Only a few external parts are required for operation.
The QT1110 modulates its bursts in a spread-spectrum fashion in order to suppress heavily the effects of external noise, and to suppress RF emissions.
AT42QT1110主要特性:
? Sensor Keys:
– Up to 11 QTouch? channels
? Data Acquistion:
– Measurement of keys triggered either by a signal applied to the SYNC pin or at
regular intervals timed by the AT42QT1110s internal clock
Keys measured sequentially for better performance, or in parallel groups for faster operation
– Raw data for key touches can be read as a report over the SPI interface
? Discrete Outputs:
– Configurable “Detect” outputs indicating individual key touch (7-key mode)
? Device Setup:
– Device configuration can be stored in EEPROM
? Technology:
– Patented spread-spectrum charge-transfer (direct mode)
? Key Outline Sizes:
– 6 mm x 6 mm or larger (panel thickness dependent); widely different sizes and
shapes possible, including solid or ring shapes
? Key Spacings:
– 7 mm center to center or more (panel thickness dependent)
? Layers Required:
– One
? Electrode Materials:
– Etched copper, silver, carbon, Indium Tin Oxide (ITO)
? Electrode Substrates:
– PCB, FPCB, plastic films, glass
? Panel Materials:
– Plastic, glass, composites, painted surfaces (low particle density metallic paints
possible)
? Panel Thickness:
– Up to 10 mm glass, 5 mm plastic (electrode size dependent)
? Key Sensitivity:
– Individually settable via simple commands over serial interface
? Adjacent Key Suppression? (AKS?)
– Patented AKS technology to enable accurate key detection
? Interface:
– Full-duplex SPI slave mode (1.5 MHz), “change” pin, discrete detection outputs
? Moisture Tolerance Good
? Power:
– 3V ~ 5.5V
? Package:
– 32-pin 5 x 5 mm MLF RoHS compliant
– 32-pin 7 x 7 mm TQFP RoHS compliant
? Signal Processing:
– Self-calibration, auto drift compensation, noise filtering, AKS technology
AT42QT1110应用:
– Specific package qualified for automotive applications, such as radio, keyless
entry, electric windows and sat nav
![](../img/eep-analog/analog-3171n32xexrou42.jpg)
图1.AT42QT1110带检测输出和不用外接触发器的7键典型应用
![](../img/eep-analog/analog-3172tu0aseiwmmp.jpg)
图2.AT42QT1110不用外接触发器的11键典型应用
![](../img/eep-analog/analog-31735bep1nwfkii.jpg)
图3.AT42QT1110带外接触发器(SYNC模式)的10键典型应用
模拟电路 模拟芯片 德州仪器 放大器 ADI 模拟电子 相关文章:
- 12位串行A/D转换器MAX187的应用(10-06)
- AGC中频放大器设计(下)(10-07)
- 低功耗、3V工作电压、精度0.05% 的A/D变换器(10-09)
- PIC16C5X单片机睡眠状态的键唤醒方法(11-16)
- 用简化方法对高可用性系统中的电源进行数字化管理(10-02)
- 利用GM6801实现智能快速充电器设计(11-20)