QT510 Datasheet, PDF (1/14 Pages) Quantum Research Group – QWHEEL TOUCH SLIDER IC

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QT510
QWHEEL™ TOUCH SLIDER IC
z Rotary finger-touch ‘wheel’ slider control
z Extremely simple circuit - no external active components
z Completely passive sensing element: no moving parts
z Compatible with clear ITO over LCD construction
z SPI slave-mode interface
z Self-calibration and drift compensation modes
z Proximity sensing for wake up function
z Spread-spectrum operation for optimal EMC compliance
z 2.5 - 5.5V single supply operation; very low power
z 14-pin SOIC and TSSOP Pb-free packages
z Inexpensive, simple 1-sided PCB construction possible
z E510 reference design board available
VDD
SDO
/SS
SCLK
SNS3B
SNS3A
SNS2B
1
14
2
13
3 QT510 12
4
11
5
10
6
9
7
8
GND
DRDY
PROX
SDI
SNS1A
SNS1B
SNS2A
APPLICATIONS
y Personal electronics
y Appliance controls
y Shaft encoders
y Automotive controls
The QT510 QSlide™ IC is a new type of rotary capacitive touch ‘slider’ sensor IC based on Quantum’s patented
charge-transfer 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. Generally it can be used to replace any form of rotary knob,
through a completely sealed panel.
The device uses a simple, inexpensive resistive sensing element between three connection points. The sense element can be
circular or any polygon shape. The sense element can also be used as a proximity sensor out to several centimeters, to wake
up an appliance or display from a sleep mode in a dramatic fashion.
The QT510 can report a single rapid touch anywhere along the sense element, or, it can track a finger moving along the wheel
surface in real time. The device self-calibrates under command from a host controller.
This device uses three channels of simultaneous sensing across a resistive element to determine finger 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 low emissions.
The output of the QT510 can also be used to create discrete controls in a circle, 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 wheel action
and discrete controls can be mixed on a single element, or, the element can be reinterpreted differently at different times, for
example when used below 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.
TA
-40⁰C ~ +85⁰C
LQ
AVAILABLE OPTIONS
SO-14
QT510-ISG
TSSOP-14
QT510-ISSG
Copyright © 2004 QRG Ltd
QT510 R6.04/0505