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參數(shù)資料
| 型號： | QT110 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | SENSOR ICs |
| 中文描述： | 傳感器IC |
| 文件頁數(shù)： | 3/12頁 |
| 文件大?。?/td> | 207K |
| 代理商： | QT110 |
1.3 ELECTRODE DESIGN
1.3.1 E
LECTRODE
G
EOMETRY
AND
S
IZE
There is no restriction on the shape of
the electrode; in most cases common
sense and a little experimentation can
result in a good electrode design. The
QT110 will operate equally well with
long, thin electrodes as with round or
square ones; even random shapes are
acceptable. The electrode can also be
a 3-dimensional surface or object.
Sensitivity is related to electrode
surface area, orientation with respect
to the object being sensed, object
composition, and the ground coupling
quality of both the sensor circuit and
the sensed object.
If a relatively large electrode surface is
desired, and if tests show that the
electrode has more capacitance than
the QT110 can tolerate, the electrode
can be made into a sparse mesh (Figure 1-4) 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 QT110 relies on Kirchoff’s
Current Law (Figure 1-5) 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 1-5), which is more than
two orders of magnitude greater than that required to create
a return path to the QT110 via earth. The QT110's PCB
however can be physically quite small, so there may be little
‘free space’ coupling (Cx1 in Figure 1-5) between it and the
environment to complete the return path. If the QT110 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
QT110’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 when used with small
electrodes;
(4) A larger electronic device (to which its output might be
connected anyway).
- 3 -
Figure 1-3 Internal Switching & Timing
C
s
C
x
SNS2
SNS1
ELECTRODE
S
S
Charge
Amp
B
Result
Done
Start
Figure 1-4 Mesh Electrode Geometry
Figure 1-5 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 |
|---|---|
| QT110H | SENSOR ICs |
| QT113 | CHARGE-TRANSFER TOUCH SENSOR |
| QT113-D | CHARGE-TRANSFER TOUCH SENSOR |
| QT113-IS | CHARGE-TRANSFER TOUCH SENSOR |
| QT113-S | CHARGE-TRANSFER TOUCH SENSOR |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| QT110_05 | 制造商:QUANTUM 制造商全稱:QUANTUM 功能描述:QTOUCH⑩ SENSOR IC |
| QT1100A | 制造商:QUANTUM 制造商全稱:QUANTUM 功能描述:10 KEY QTOUCH SENSOR IC |
| QT1100A-IS | 功能描述:IC SENSOR 10CHAN QTOUCH 48SSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 觸摸屏控制器 系列:QTouch™ 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) |
| QT1100A-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 |
| QT1100-ISG | 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 |
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