QT113H Datasheet, PDF (1/12 Pages) ATMEL Corporation – CHARGE-TRANSFER TOUCH SENSOR

QProx™ QT113 / QT113H
CHARGE-TRANSFER TOUCH SENSOR
! Projects a proximity field through air
! Less expensive than many mechanical switches
! Sensitivity easily adjusted via capacitor value
! Turns small objects into intrinsic touch sensors
! 100% autocal for life - no adjustments required
! 2.5 to 5V, 600µA single supply operation
! Toggle mode for on/off control (strap option)
! 10s, 60s, infinite auto-recal timeout (strap options)
! Gain settings in 2 discrete levels
! HeartBeat™ health indicator on output
! Active-low (QT113) or active-high outputs (QT113H)
! Only one external part required - a 1¢ capacitor
Vdd
1
O ut
2
O pt1
3
O pt2
4
8
Vss
7
Sn s2
6
Sn s1
5
Gain
APPLICATIONS -
! Light switches
! Prox sensors
! Appliance control
! Security systems
! Access systems
! Pointing devices
! Elevator buttons
! Toys & games
The QT113 charge-transfer (“QT’”) touch sensor is a self-contained digital IC capable of detecting near-proximity or touch. It will
project a proximity sense field through air, via almost any dielectric, like glass, plastic, stone, ceramic, and most kinds of wood. It can
also turn small metal-bearing objects into intrinsic sensors, making them responsive to proximity or touch. This capability coupled with
its ability to self calibrate continuously can lead to entirely new product concepts.
It is designed specifically for human interfaces, like control panels, appliances, toys, lighting controls, or anywhere a mechanical
switch or button may be found; it may also be used for some material sensing and control applications provided that the presence
duration of objects does not exceed the recalibration timeout interval.
The QT113 requires only a common inexpensive capacitor in order to function.
Power consumption is only 600µA in most applications. In most cases the power supply need only be minimally regulated, for example
by Zener diodes or an inexpensive 3-terminal regulator.
The QT113’s RISC core employs signal processing techniques pioneered by Quantum; these are specifically designed to make the
device survive real-world challenges, such as ‘stuck sensor’ conditions and signal drift. Even sensitivity is digitally determined and
remains constant in the face of large variations in sample capacitor CS and electrode CX. No external switches, opamps, or other
analog components aside from CS are usually required.
The option-selectable toggle mode permits on/off touch control, for example for light switch replacement. The Quantum-pioneered
HeartBeat™ signal is also included, allowing a host microcontroller to monitor the health of the QT113 continuously if desired. By
using the charge transfer principle, the IC delivers a level of performance clearly superior to older technologies in a highly
cost-effective package.
TA
0⁰C to +70⁰C
0⁰C to +70⁰C
-40⁰C to +85⁰C
-40⁰C to +85⁰C
Quantum Research Group Ltd
AVAILABLE OPTIONS
SOIC
QT113-S
QT113H-S
QT113-IS
QT113H-IS
8-PIN DIP
QT113-D
QT113H-D
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Copyright Quantum Research Group Ltd
R1.10/0104