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QT411-ISSG Schematic ( PDF Datasheet ) - Quantum Research

Teilenummer QT411-ISSG
Beschreibung Touch Slider IC
Hersteller Quantum Research
Logo Quantum Research Logo 




Gesamt 12 Seiten
QT411-ISSG Datasheet, Funktion
om QT411-ISSGlQ
et4U.c QS ™ T S ICz QT401 QSlide™ enhancement - simplified calibration
ez Linear finger-touch capacitive slider control
Shz Robust Charge-Transfer sensing method
taz Extremely simple circuit - no external active components
.Daz SPI slave-mode interface
z Self-calibration and drift compensation
wwz Spread-spectrum operation for optimal EMC compliance
wz 2.5 - 5.5V single supply operation; very low power
LIDE
OUCH LIDER
VDD
SDO
/SS
SCLK
SNS3B
1 14
2 13
3 QT411 12
4 11
5 10
GND
DRDY
DETECT
SDI
SNS1A
z Enhanced power supply & thermal drift rejection
z 14-pin TSSOP Pb-free package
mz Compatible with clear ITO over LCD construction
oz Inexpensive, simple 1-sided PCB construction possible
SNS3A
SNS2B
6
7
9 SNS1B
8 SNS2A
U.cAPPLICATIONS
y Personal electronics
y Appliance controls
y Climate controls
y Automotive controls
et4The QT411 QSlide™ IC is a new type of linear capacitive touch ‘slider’ sensor IC based on Quantum’s patented
charge-transfer (‘QT’) methods. This unique IC allows designers to create speed or volume controls, menu bars, and other
emore exotic forms of human interface on the panel of an appliance or personal electronic device. Generally it can be used to
replace any form of linear control, through a completely sealed panel.
hThe device uses a simple, inexpensive resistive sensing element between four connection points. The sense element can be a
straight line or curved. The device can report a single rapid touch anywhere along the sense element, or, it can track a finger
Smoving along the sensing surface in real time.
taThis device uses three channels of synchronous sensing across a resistive element to determine touch position, using
mathematical analysis. A positional accuracy of 5% (or better) is relatively easy to achieve. The acquisitions are performed in a
burst mode which uses proprietary spread-spectrum modulation for superior noise immunity and ultra-low RF low emissions.
aThe output of the QT411 can also be used to create discrete controls buttons in a line, by interpreting sets of number ranges
as buttons. For example, the number range 0..19 can be button A, 30..49 button B, 60..79 button C etc. Continuous slider
.Daction and number-range based discrete control points can be mixed on a single element, or, the element can be reinterpreted
differently at different times, for example when used adjacent to or on top of an LCD to act as a menu input device that
dynamically changes function in context. The device is compatible with ITO (Indium Tin Oxide) overlays on top of various
wdisplays or simply to provide for a backlighting effect.
The QT411 is significantly more stable with temperature and other environmental influences than the QT401 which it is
wdesigned to replace. In particular it can tolerate extreme temperature swings without false detection or shifts in reported touch
position. Also it does not require special calibration of the endpoints of the slider area. However, unlike the QT401 the QT411
wdoes not have a proximity detection function.
LQ
ataSheet4U.comCopyright © 2005 QRG Ltd
www.DQT411-ISSG R6.01/1005






QT411-ISSG Datasheet, Funktion
The SMT components should be oriented perpendicular to
the direction of bending so that they do not fracture when the
PCB is flexed during bonding to the panel.
Additional ground area or a ground plane on the PCB will
compromise signal strength and is to be avoided. A single
sided PCB can be made of FR-2 or CEM-1 for low cost.
‘Handshadow’ effects: With thicker and wider panels an
effect known as ‘handshadow’ can become noticeable. If the
capacitive coupling from finger to electrode element is weak,
for example due to a narrow electrode width or a thick, low
dielectric constant panel, the remaining portion of the human
hand can contribute a significant portion of the total
detectable capacitive load. This will induce an offset error,
which will depend on the proximity and orientation of the hand
to the remainder of the element. Thinner panels and those
with a smaller diameter will reduce this effect since the finger
contact surface will strongly domina te the total signal, and the
remaining handshadow capacitance will not contribute
significantly to create an error offset.
PCB Cleanliness: All capacitive sensors should be treated
as highly sensitive circuits which can be influenced by stray
conductive leakage paths. QT devices have a basic
resolution in the femtofarad range; in this region, there is no
such thing as ‘no clean flux’. Flux absorbs moisture and
becomes conductive between solder joints, causing signal
drift and resultant false detections or temporary loss of
sensitivity. Conformal coatings will trap in existing amounts of
moisture which will then become highly temperature
sensitive.
The designer should specify ultrasonic cleaning as part of the
manufacturing process, and in extreme cases, the use of
conformal coatings after cleaning.
2.6 ESD, EMC and Related Issues
Please refer to Quantum app note AN-KD02 for further
information on ESD and EMC matters.
3 Serial Communications
The serial interface is a SPI slave-only mode type which is
compatible with multi-drop operation, i.e. the MISO pin will
float after a shift operation to allow other SPI devices (master
or slave) to talk over the same bus. There should be one
dedicated /SS line for each QT411 from the host controller.
A DRDY (‘data ready’) line is used to indicate to the host
controller when it is possible to talk to the QT411.
3.1 Power-up Timing Delay
Immediately after power-up, DRDY floats for approximately
20ms, then goes low. The device requires ~525ms thereafter
before DRDY goes high again, indicating that the device has
calibrated and is able to communicate.
From power up to first communication, allow a total of 550ms
in startup delay.
3.2 SPI Timing
The SPI interface is a five-wire slave-only type; timings are
found in Figure 3-1. The phase clocking is as follows:
Clock idle: High
Data out changes on: Falling edge of CLK from host
Input data read on: Rising edge of CLK from host
Slave Select /SS: Negative level frame from host
Data Ready DRDY: Low from QT inhibits host
Bit length & order: 8 bits, MSB shifts first
Clock rate: 5kHz min, 40kHz max
The host can shift data to and from the QT on the same cycle
(with overlapping commands). Due to the nature of SPI, the
return data from a command or request is always one SPI
cycle behind.
An acquisition burst always happens about 920µs after /SS
goes high after coming out of Sleep mode . SPI clocking
lasting more than 15ms can cause the chip to self-reset.
Figure 3-1 SPI Timing Diagram
Acquire Burst
~31ms
Sleep Mode
awake
low-power sleep
DRDY from QT
/SS from host
>13us, <100us
>12us, <100us
>12us, <100us
CLK from Host
Data sampled on rising edge
Data shifts out on falling edge
Host Data Output
(Slave Input - MOSI)
?
76543210
<10us delay
command byte
edge to data
response byte
QT Data Output
(Slave Out - MISO)
3-state
?7 6 5 4 3 2 1 0
output driven
<12us after /SS
goes low
3-state if left to float
<35us
sleep until automatic wake (~3s)
data hold >=12us
after last clock
3-state
output floats
before DRDY
goes low
<1ms
awake
400us typ
~31ms
sleep
<1ms
>20us
>1us, <5us
wake up on /SS line
lQ
6 QT411-ISSG R6.01/1005

6 Page









QT411-ISSG pdf, datenblatt
lQ
Copyright © 2004-2005 QRG Ltd. All rights reserved.
Patented and patents pending
Corporate Headquarters
1 Mitchell Point
Ensign Way, Hamble SO31 4RF
Great Britain
Tel: +44 (0)23 8056 5600 Fax: +44 (0)23 80565600
www.qprox.com
North America
651 Holiday Drive Bldg. 5 / 300
Pittsburgh, PA 15220 USA
Tel: 412-391-7367 Fax: 412-291-1015
This device covered under one or more of the following United States and corresponding international patents: 5,730,165, 6,288,707,
6,377,009, 6,452,514, 6,457,355, 6,466,036, 6,535,200. Numerous further patents are pending which may apply to this device or the
applications thereof.
The specifications set out in this document are subject to change without notice. All products sold and services supplied by QRG are subject
to our Terms and Conditions of sale and supply of services which are available online at www.qprox.com and are supplied with every order
acknowledgment. QProx, QTouch, QMatrix, QLevel, QWheel, QView, QScreen, and QSlide are trademarks of QRG. QRG products are not
suitable for medical (including lifesaving equipment), safety or mission critical applications or other similar purposes. Except as expressly set
out in QRG's Terms and Conditions, no licenses to patents or other intellectual property of QRG (express or implied) are granted by QRG in
connection with the sale of QRG products or provision of QRG services. QRG will not be liable for customer product design and customers
are entirely responsible for their products and applications which incorporate QRG's products.
Development Team: Martin Simmons, Matthew Trend

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