- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄361324 > QT113-D (Electronic Theatre Controls, Inc.) CHARGE-TRANSFER TOUCH SENSOR PDF資料下載
參數(shù)資料
| 型號： | QT113-D |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | CHARGE-TRANSFER TOUCH SENSOR |
| 中文描述： | 電荷轉(zhuǎn)移觸摸傳感器 |
| 文件頁數(shù)： | 3/12頁 |
| 文件大?。?/td> | 180K |
| 代理商： | QT113-D |
can be made into a sparse mesh (Figure 1-3) having lower
Cx than a solid plane. Sensitivity may even remain the same,
as the sensor will be operating in a lower region of the gain
curves.
1.3.2 K
IRCHOFF
’
S
C
URRENT
L
AW
Like all capacitance sensors, the QT113 relies on Kirchoff’s
Current Law (Figure 1-4) to detect the change in capacitance
of the electrode. This law as applied to capacitive sensing
requires that the sensor’s field current must complete a loop,
returning back to its source in order for capacitance to be
sensed. Although most designers relate to Kirchoff’s law with
regard to hardwired circuits, it applies equally to capacitive
field flows. By implication it requires that the signal ground
and the target object must both be coupled together in some
manner for a capacitive sensor to operate properly. Note that
there is no need to provide actual hardwired ground
connections; capacitive coupling to ground (Cx1) is always
sufficient, even if the coupling might seem very tenuous. For
example, powering the sensor via an isolated transformer will
provide ample ground coupling, since there is capacitance
between the windings and/or the transformer core, and from
the power wiring itself directly to 'local earth'. Even when
battery powered, just the physical size of the PCB and the
object into which the electronics is embedded will generally
be enough to couple a few picofarads back to local earth.
1.3.3 V
IRTUAL
C
APACITIVE
G
ROUNDS
When detecting human contact (e.g. a fingertip), grounding
of the person is never required. The human body naturally
has several hundred picofarads of ‘free space’ capacitance to
the local environment (Cx3 in Figure 1-4), which is more than
two orders of magnitude greater than that required to create
a return path to the QT113 via earth. The QT113's PCB
however can be physically quite small, so there may be little
‘free space’ coupling (Cx1 in Figure 1-4) between it and the
environment to complete the return path. If the QT113 circuit
ground cannot be earth grounded by wire, for example via
the supply connections, then a ‘virtual capacitive ground’ may
be required to increase return coupling.
A ‘virtual capacitive ground’ can be created by connecting the
QT113’s own circuit ground to:
(1) A nearby piece of metal or metallized housing;
(2) A floating conductive ground plane;
(3) A nail driven into a wall;
(4) A larger electronic device (to which its output might be
connected anyway).
Free-floating ground planes such as metal foils should
maximize exposed surface area in a flat plane if possible. A
square of metal foil will have little effect if it is rolled up or
crumpled into a ball. Virtual ground planes are more effective
and can be made smaller if they are physically bonded to
other surfaces, for example a wall or floor.
1.3.4 F
IELD
S
HAPING
The electrode can be prevented from sensing in undesired
directions with the assistance of metal shielding connected to
circuit ground (Figure 1-5). For example, on flat surfaces, the
field can spread laterally and create a larger touch area than
desired. To stop field spreading, it is only necessary to
surround the touch electrode on all sides with a ring of metal
connected to circuit ground; the ring can be on the same or
opposite side from the electrode. The ring will kill field
spreading from that point outwards.
If one side of the panel to which the electrode is fixed has
moving traffic near it, these objects can cause inadvertent
detections. This is called ‘walk-by’ and is caused by the fact
that the fields radiate from either surface of the electrode
equally well. Again, shielding in the form of a metal sheet or
foil connected to circuit ground will prevent walk-by; putting a
small air gap between the grounded shield and the electrode
will keep the value of Cx lower and is encouraged. In the
case of the QT113, sensitivity can be high enough
(depending on Cx and Cs) that 'walk-by' signals are a
concern; if this is a problem, then some form of rear shielding
may be required.
1.3.5 S
ENSITIVITY
The QT113 can be set for one of 2 gain levels using option
pin 5 (Table 1-1). This sensitivity change is made by altering
the internal numerical threshold level required for a detection.
Note that sensitivity is also a function of other things: like the
value of Cs, electrode size, shape, and orientation, the
composition and aspect of the object to be sensed, the
thickness and composition of any overlaying panel material,
and the degree of ground coupling of both sensor and object.
1.3.5.1 Increasing Sensitivity
In some cases it may be desirable to increase sensitivity
further, for example when using the sensor with very thick
panels having a low dielectric constant.
Sensitivity can often be increased by using a bigger
electrode, reducing panel thickness, or altering panel
composition. Increasing electrode size can have diminishing
returns, as high values of Cx will reduce sensor gain (Figures
- 3 -
Figure 1-3 Mesh Electrode Geometry
Figure 1-4 Kirchoff's Current Law
Sense Electrode
C
X2
Surround ing e nvironm ent
C
X3
SENSOR
C
X1
相關PDF資料 |
PDF描述 |
|---|---|
| QT113-IS | CHARGE-TRANSFER TOUCH SENSOR |
| QT113-S | CHARGE-TRANSFER TOUCH SENSOR |
| QT113H | CHARGE-TRANSFER TOUCH SENSOR |
| QT113H-D | CHARGE-TRANSFER TOUCH SENSOR |
| QT113H-IS | CHARGE-TRANSFER TOUCH SENSOR |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| QT113-DG | 功能描述:板機接口移動感應器和位置傳感器 INTEGRATED-CIRCUIT RoHS:否 制造商:Panasonic Electric Works 封裝 / 箱體:TO-5 感應距離:3 m 輸出類型:Digital 電源電壓-最大:6 V 電源電壓-最小:2.3 V 電源電流: 最大工作溫度:+ 60 C 封裝:Bulk |
| QT113-G | 制造商:QUANTUM 制造商全稱:QUANTUM 功能描述:CHARGE-TRANSFER TOUCH SENSOR |
| QT113H | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CHARGE-TRANSFER TOUCH SENSOR |
| QT113HA-ISG | 功能描述:接口 - 專用 Integrated Circuit RoHS:否 制造商:Texas Instruments 產(chǎn)品類型:1080p60 Image Sensor Receiver 工作電源電壓:1.8 V 電源電流:89 mA 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:BGA-59 |
| QT113H-D | 功能描述:SENSOR IC TOUCH/PROXMTY 1CH 8DIP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 觸摸屏控制器 系列:QProx™ 標準包裝:96 系列:- 類型:- 觸摸面板接口:- 輸入數(shù)/鍵:- 分辨率（位）:- 評估套件:* 數(shù)據(jù)接口:- 數(shù)據(jù)速率/采樣率 (SPS，BPS):- 電壓基準:- 電源電壓:- 電流 - 電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:16-TSSOP 包裝:帶卷 (TR) |
發(fā)布緊急采購，3分鐘左右您將得到回復。