at42qt1012 ATMEL Corporation, at42qt1012 Datasheet - Page 3

• Manufacturer Part Number: at42qt1012
• Description: One-channel Toggle-mode Touch Sensor Ic With Power Management Functions
• Manufacturer: ATMEL Corporation

1.3
2. Overview of the AT42QT1012
2.1
9543CS–AT42–02/10
Schematic
Introduction
Figure 1-1.
The AT42QT1012 (QT1012) is a single key device featuring a touch on/touch off (toggle) output
with a programmable auto switch-off capability.
The QT1012 is a digital burst mode charge-transfer (QT
controls. It includes all hardware and signal processing functions necessary to provide stable
sensing under a wide variety of changing conditions; only low cost, noncritical components are
required for operation. With its tiny low-cost SOT-23 package, this device can suit almost any
product needing a power switch or other toggle-mode controlled function, especially power
control of small appliances and battery-operated products.
A unique “green” feature of the QT1012 is the timeout function, which can turn off power after a
specified time delay ranging from minutes to an hour.
Like all QTouch
and spread-spectrum burst modulation in order to provide for the most reliable touch sensing
possible.
ELECTRODE
SENSE
Basic Circuit Configuration
(active high output, toggle on/off, no auto switch off)
®
devices, the QT1012 features automatic self-calibration, drift compensation,
RS
CS
3
4
SNS
SNSK
VDD
VDD
VSS
5
2
TIME
OUT
™
) sensor designed specifically for touch
6
1
Note: bypass capacitor to be tightly
wired between VDD and VSS and
kept close to pin 5.
Rop
AT42QT1012
3