QT411-ISSG Atmel, QT411-ISSG Datasheet

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QT411-ISSG

Manufacturer Part Number
QT411-ISSG
Description
IC SENSOR TCH SLDR QSLDE 14TSSOP
Manufacturer
Atmel
Series
QSlide™r
Type
Capacitiver
Datasheet

Specifications of QT411-ISSG

Number Of Inputs/keys
3 Slider
Resolution (bits)
7 b
Data Interface
Serial, SPI™
Data Rate/sampling Rate (sps, Bps)
98k
Voltage - Supply
2.5 V ~ 5 V
Current - Supply
1.5mA
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
14-TSSOP
Output Type
Logic
Interface
SPI
Input Type
Logic
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
427-1116-2
l
l
l
l
APPLICATIONS
The 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
more 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.
The 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
moving along the sensing surface in real time.
This 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.
The 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
action 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
displays 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
designed 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
does not have a proximity detection function.
LQ
QT401 QSlide™ enhancement - simplified calibration
Linear finger-touch capacitive slider control
Robust Charge-Transfer sensing method
Extremely simple circuit - no external active components
SPI slave-mode interface
Self-calibration and drift compensation
Spread-spectrum operation for optimal EMC compliance
2.5 - 5.5V single supply operation; very low power
Enhanced power supply & thermal drift rejection
14-pin TSSOP Pb-free package
Compatible with clear ITO over LCD construction
Inexpensive, simple 1-sided PCB construction possible
Personal electronics
Q
Q
Q
Q
Appliance controls
Climate controls
QS
LIDE
SNS3B
SNS2B
SNS3A
™ T
SCLK
SDO
VDD
/SS
Copyright © 2005 QRG Ltd
QT411-ISSG
QT411-ISSG R6.01/1005
OUCH
1
2
3
4
5
6
7
Automotive controls
QT411
S
14
13
12
11
10
9
8
LIDER
GND
DRDY
DETECT
SDI
SNS1A
SNS1B
SNS2A
IC

Related parts for QT411-ISSG

QT411-ISSG Summary of contents

Page 1

... Also it does not require special calibration of the endpoints of the slider area. However, unlike the QT401 the QT411 does not have a proximity detection function. LQ Appliance controls Climate controls QT411-ISSG QS ™ LIDE OUCH VDD 1 SDO 2 QT411 /SS 3 SCLK 4 SNS3B 5 SNS3A 6 SNS2B 7 Automotive controls Copyright © 2005 QRG Ltd QT411-ISSG R6.01/1005 IC LIDER 14 GND 13 DRDY 12 DETECT 11 SDI 10 SNS1A 9 SNS1B 8 SNS2A ...

Page 2

... SNS3B 5 R1 22k Cs3 100nF SNS3A 6 SNS2A 8 Cs2 13 DRDY 100nF 2 SDO SNS2B 7 3 /SS Rs2 4. SCLK SNS1A Cs1 11 SDI 100nF 12 9 DETECT SNS1B C3 Rs1 4.7k VSS 1nF ~31ms ~30us ~25ms QT411-ISSG R6.01/1005 'RIGHT' Rs5 8.2k 127 ~400k 83 ~400k 45 ~400k 0 Rs4 8.2k 'LEFT' ...

Page 3

... Only the center 80% of the slider’s length will track changes in touch position in the range of 1..126. The position data will update either with a single rapid touch or will track if the finger is moved along the surface of the 3 QT411-ISSG R6.01/1005 ...

Page 4

... Under heavy capacitive loading (for example if the element Table 1-2 Recommended Cs vs. Materials Thickness, Acrylic ε ε ε ε =2.8) R 0.4 10nF 0.8 22nF 47nF 1.5 100nF 2.5 3 QT411-ISSG R6.01/1005 Borosilicate glass ε ε ε ε ( =4.8) R 5.6nF 10nF 22nF 39nF 47nF 100nF ...

Page 5

... The electrode strip can be made in various lengths least 80mm. The electrode width should be about 12mm wide or more rule. The strip can also be an arc or other irregular shape. For a 360 degree wheel, use the QT511 or consult Quantum for other options. 5 QT411-ISSG R6.01/1005 TM etc.) can also be ...

Page 6

... Slave Select /SS: Negative level frame from host Low from QT inhibits host Bit length & order: 8 bits, MSB shifts first Clock rate: 5kHz min, 40kHz max ~31ms ~31ms <1ms awake sleep 400us typ QT411-ISSG R6.01/1005 <1ms >20us >1us, <5us wake up on /SS line ...

Page 7

... QT501 or QT511), and ‘0’ means the device is a linear type (e.g. QT411, or QT401). There are 5 commands as follows. 3.3.1 0x00 - Null Command The Null command will trigger a new acquisition (if /SS rises), otherwise, it does nothing. The response to this command is the Standard Response byte, returned on the next SPI shift. 7 QT411-ISSG R6.01/1005 ...

Page 8

... The error byte is returned on the following SPI shift Bit indicates touch indicates no touch Bit indicates Linear type (QT401 or QT411 indicates Wheel type (QT510 or QT511) Bits unused (0) Bit calibration error Bit 0 reserved (reports QT411-ISSG R6.01/1005 ...

Page 9

... Null command with 0x03 where typically 0x04 (Error status) - use after any detection just after a calibration or power-up to see if there is a calibration error. QT411-ISSG R6.01/1005 ...

Page 10

... Under host control pF Variable parameter under host control kHz Modulated spread-spectrum (chirp kHz Units Notes counts Both prox and touch detection Host controlled variable Host controlled variable % % of threshold setting % % of threshold setting % % of bursts; host controlled % Depends on element linearity, layout QT411-ISSG R6.01/1005 + +125 O C ...

Page 11

... B 0.007 0.010 0.012 PACKAGE TEMP RANGE TSSOP- MILLIMETERS MIN NOM MAX 14 0.65 1.10 0.05 0.10 0.15 6.25 6.38 6.50 4.30 4.40 4.50 4.90 5.00 5.10 0.50 0.60 0. 0.09 0.15 0.20 0.19 0.25 0. MARKING 0 C QT411 QT411-ISSG R6.01/1005 ...

Page 12

Tel: +44 (0)23 8056 5600 Fax: +44 (0)23 80565600 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 ...

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