at42qt113b ATMEL Corporation, at42qt113b Datasheet - Page 3

• Manufacturer Part Number: at42qt113b
• Manufacturer: ATMEL Corporation

1.3
2. Overview of the AT42QT113B
2.1
9525B–AT42–09/10
Schematic
Introduction
Figure 1-1.
Re
The QT113B charge-transfer (QT
detecting near-proximity or touch. It will project a proximity sense field through air, and 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.
Power consumption is only 600 µA 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 QT113B requires only a common inexpensive capacitor in order to function.
The QT113B‘s RISC core employs signal processing techniques pioneered by Atmel
specifically designed to make the device survive real-world challenges, such as “stuck sensor”
conditions and signal drift.
The option-selectable toggle mode permits on/off touch control, for example for light switch
replacement. The Atmel-pioneered HeartBeat™ signal is also included, allowing a
microcontroller to monitor the health of the QT113B 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.
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Section 4.1 on page
Section 5.2 on page
Figure 1-1 on page 3
Typical Circuit
OUTPUT = DC
TIMEOUT = 10s
TOGGLE = OFF
GAIN = HIGH
12:
15: Voltage levels
2
3
4
check the following sections for component values:
OUT
OPT1
OPT2
Cs capacitor
Vdd
1
8
Vdd
Vss
SNS2
GAIN
SNS1
™
) touch sensor is a self-contained digital IC capable of
7
5
6
R
Cs
SERIES
ELECTRODE
SENSING
C x
AT42QT113B
®
; these are
3