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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)： | 5/12頁 |
| 文件大小： | 207K |
| 代理商： | QT110 |
2 - QT110 SPECIFICS
2.1 SIGNAL PROCESSING
The QT110 processes all signals using 16 bit math, using a
number of algorithms pioneered by Quantum. The algorithms
are specifically designed to provide for high 'survivability' in
the face of all kinds of adverse environmental changes.
2.1.1 D
RIFT
C
OMPENSATION
A
LGORITHM
Signal drift can occur because of changes in Cx and Cs over
time. It is crucial that drift be compensated for, otherwise
false detections, non-detections, and sensitivity shifts will
follow.
Drift compensation (Figure 2-1) is performed by making the
reference level track the raw signal at a slow rate, but only
while there is no detection in effect. The rate of adjustment
must be performed slowly, otherwise legitimate detections
could be ignored. The QT110 drift compensates using a
slew-rate limited change to the reference level; the threshold
and hysteresis values are slaved to this reference.
Once an object is sensed, the drift compensation mechanism
ceases since the signal is legitimately high, and therefore
should not cause the reference level to change.
The QT110's drift compensation is 'asymmetric': the
reference level drift-compensates in one direction faster than
it does in the other. Specifically, it compensates faster for
decreasing signals than for increasing signals. Increasing
signals should not be compensated for quickly, since an
approaching finger could be compensated for partially or
entirely before even touching the sense pad. However, an
obstruction over the sense pad, for which the sensor has
already made full allowance for, could suddenly be removed
leaving the sensor with an artificially elevated reference level
and thus become insensitive to touch. In this latter case, the
sensor will compensate for the object's removal very quickly,
usually in only a few seconds.
2.1.2 T
HRESHOLD
C
ALCULATION
Sensitivity is dependent on the threshold level as well as
ADC gain; threshold in turn is based on the internal signal
reference level plus a small differential value. The threshold
value is established as a percentage of the absolute signal
level. Thus, sensitivity remains constant even if Cs is altered
dramatically, so long as electrode coupling to the user
remains constant. Furthermore, as Cx and Cs drift, the
threshold level is automatically recomputed in real time so
that it is never in error.
The QT110 employs a hysteresis dropout below the
threshold level of 50% of the delta between the reference and
threshold levels.
2.1.3 M
AX
O
N
-D
URATION
If an object or material obstructs the sense pad the signal
may rise enough to create a detection, preventing further
operation. To prevent this, the sensor includes a timer which
monitors detections. If a detection exceeds the timer setting,
the timer causes the sensor to perform a full recalibration.
This is known as the Max On-Duration feature.
After the Max On-Duration interval, the sensor will once again
function normally, even if partially or fully obstructed, to the
best of its ability given electrode conditions. There are two
timeout durations available via strap option: 10 and 60
seconds.
2.1.4 D
ETECTION
I
NTEGRATOR
It is desirable to suppress detections generated by electrical
noise or from quick brushes with an object. To accomplish
this, the QT110 incorporates a detect integration counter that
increments with each detection until a limit is reached, after
which the output is activated. If no detection is sensed prior
to the final count, the counter is reset immediately to zero. In
the QT110, the required count is 4.
The Detection Integrator can also be viewed as a 'consensus'
filter, that requires four detections in four successive bursts to
create an output. As the basic burst spacing is 75ms, if this
spacing was maintained throughout all 4 counts the sensor
would react very slowly. In the QT110, after an initial
detection is sensed, the remaining three bursts are spaced
about 18ms apart, so that the slowest reaction time possible
is 75+18+18+18 or 129ms and the fastest possible is 54ms,
depending on where in the initial burst interval the contact
first occurred. The response time will thus average 92ms.
2.1.5 F
ORCED
S
ENSOR
R
ECALIBRATION
The QT110 has no recalibration pin; a forced recalibration is
accomplished only when the device is powered up. However,
supply drain is so low it is a simple matter to treat the entire
IC as a controllable load; simply driving the QT110's Vdd pin
directly from another logic gate or a microprocessor port
(Figure 2-2) will serve as both power and 'forced recal'. The
source resistance of most CMOS gates and microprocessors
is low enough to provide direct power without any problems.
Note that most 8051-based micros have only a weak pullup
drive capability and will require true CMOS buffering. Any
74HC or 74AC series gate can directly power the QT110, as
can most other microprocessors.
Option strap configurations are read by the QT110 only on
powerup. Configurations can only be changed by powering
the QT110 down and back up again; again, a microcontroller
can directly alter most of the configurations and cycle power
to put them in effect.
- 5 -
10s
Vdd
Gnd
Pulse
10s
Gnd
Gnd
Toggle
60s
Gnd
Vdd
DC Out
10s
Vdd
Vdd
DC Out
Max On-
Duration
Tie
Pin 4 to:
Tie
Pin 3 to:
Table 2-1 Output Mode Strap Options
Figure 2-2 Powering From a CMOS Port Pin
0.01μF
CMOS
microcontroller
OUT
PORT X.m
PORT X.n
Vdd
Vss
QT110
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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