收藏本站
5.2 Acquisition Methods
There are two methods available for touch acquisition namely
1. QTouch acquisition method.
2. QMatrix acquisition method.
Libraries for AVR microcontrollers include both acquisition methods. Libraries for ATSAM
microcontrollers include only QTouch acquisition method.
5.2.1 QTouch acquisition method
The QTouch acquisition method charges an electrode of unknown capacitance to a known
potential. The resulting charge is transferred into a measurement capacitor (Cs). The cycle is
repeated until the voltage across Cs reaches a voltage Vih. The signal level is the number of
charge transfer cycles it took to reach that voltage. Placing a finger on the touch surface
introduces external capacitance that increases the amount of charge transferred each cycle,
reducing the total number of cycles required for Cs to reach the voltage. When the signal level
(number of cycles) goes below the present threshold, then the sensor is reported to be in
detected.
QTouch acquisition method sensors can drive single or multiple keys. Where multiple keys are
used, each key can be set for an individual sensitivity level. Keys of different sizes and shapes
can be used to meet both functional and aesthetic requirements.
NOTE: It is recommended to keep the size of the keys larger than 6mmx6mm to ensure reliable
and robust measurements, although actual key design requirements also depend on panel
thickness and material. Refer to the ATMEL Capacitive touch sensor design guide for details.
QTouch acquisition method can be used in two ways
?
?
normal touch contact (i.e. when pressing buttons on a panel), and
high sensitivity proximity mode (i.e. when a panel lights up before you actually contact it).
Figure 5-2 : QTouch Acquisition
QTouch circuits offers high signal-to-noise ratio, very good low power performance, and the
easiest sensor layout.
13
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
ATU6-P305T-R CABLE CAT6 FULL-BOX 305M GRAY
ATUP-P305T-R CABLE CAT5E PULL-BOX 305M GRAY
ATUP-V305T-R CABLE CAT5E REEL 305M GRAY
AWG28-05/F-1/300-R CABLE 5 COND MULTI 300' RIBBON
AWG28-05/G-1/300-R CABLE 5 COND GRAY 300' RIBBON
AWG28-09/F-1/300-R CABLE 9 COND MULTI 300' RIBBON
AWG28-09/G-1/300-R CABLE 9 COND GRAY 300' RIBBON
AWG28-25/F-1/300-R CABLE 25 COND MULTI 300' RIBBON
相关代理商/技术参数
ATQT600IB 功能描述:界面开发工具 ATQT600IB Interface Brd RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V
ATQT6-XPRO 功能描述:Xplained Pro - Extension Board 制造商:atmel 系列:- 零件状态:有效 配件类型:扩展板 配套使用产品/相关产品:Xplained Pro 标准包装:1
ATR 1078 功能描述:TOOL INSERTION TWEEZER 20 GA 制造商:astro tool corp 系列:* 零件状态:有效 标准包装:1
ATR 1079 功能描述:TWEEZER INSERTION 20 GA 制造商:astro tool corp 系列:* 零件状态:有效 标准包装:1
ATR 1080 制造商:Astro Tool Corp 功能描述:TOOL INSERTION 20 GA
ATR 1080-135 功能描述:INSERTION TOOL 20 GA ANGLED TIP 制造商:astro tool corp 系列:* 零件状态:有效 标准包装:1
ATR 1080-S 功能描述:INSERTION TOOL STRAIGHT 制造商:astro tool corp 系列:* 零件状态:有效 标准包装:1
ATR 1105 功能描述:TOOL INSERTION TWEEZER 16 GA 制造商:astro tool corp 系列:* 零件状态:有效 标准包装:1