Rainbow Electronics AT42QT1011 - Manual (Page 3)

3
9542ES–AT42–02/10
AT42QT1011
1.3 Schematic
Figure 1-1. Basic Circuit Configuration
2. Overview of the AT42QT1011
The AT42QT1011 (QT1011) is a digital burst mode charge-transfer (QT ™ ) sensor that is capable
of detecting near-proximity or touch, making it ideal for implementing touch controls.
With the proper electrode and circuit design, the self-contained digital IC will project a touch or
proximity field to several centimeters through any dielectric like glass, plastic, stone, ceramic,
and even 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, can lead to entirely new product concepts.
The QT1011 is designed specifically for human interfaces, like control panels, appliances, toys,
lighting controls, or anywhere a mechanical switch or button may be found. It includes all
hardware and signal processing functions necessary to provide stable sensing under a wide
variety of changing conditions. Only a single low-cost capacitor is required for operation.
Cs
OUT
VDD
SNSK
SNS
SYNC/MODE
VSS
2
6
4
3 1
5
VDD
Rs
Cx
SENSE
ELECTRODE
Note: A bypass capacitor should be tightly wired
between Vdd and Vss and kept close to pin 5.