LQ
QT102
QT
OUCH
™
T
OGGLE
-M
ODE
C
HARGE
-T
RANSFER
IC
W
ITH
P
OWER
M
ANAGEMENT
F
UNCTIONS
This datasheet is applicable to all revision 2.3 chips
The QT102 is a single key QTouch™ chip combining a touch-on / touch-off
toggle mode with timeout and timing override functions, oriented especially
towards power control of small appliances and battery-operated products. 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.
A unique 'Green' feature of the QT102 is the timeout function, which can turn
off power after a specified time delay ranging from minutes to hours.
Furthermore, external 'sustain' and 'cancel' functions permit designs where the
timeout needs to be extended further or terminated early. A user's interaction
with a product might trigger a 'sustain' input, prolonging the time to shutoff. A
safety sensor, such as a tip-over switch on a space heater, can feed the
'cancel' function to terminate early.
Like all QTouch™ devices, the QT102 features automatic self-calibration, drift
compensation, and spread-spectrum burst modulation in order to provide for
the most reliable touch sensing possible. This device brings inexpensive,
easy-to-implement capacitive touch sensing to all kinds of appliances and
equipment, from toys to coffee makers. The small, low cost SOT-23 package
lets this unique combination of features reside in almost any product.
OUT
VSS
SNSK
1
6
TIME
VDD
SNS
QT102
2
3
5
4
AT A GLANCE
Number of keys:
Technology:
Key outline sizes:
Electrode design:
PCB Layers required:
Electrode materials:
Electrode substrates:
Panel materials:
Panel thickness:
Key sensitivity:
Interface:
Moisture tolerance:
Power:
Package:
Signal processing:
Applications:
One toggle mode (touch-on / touch-off), plus programmable auto-off delay and external cancel
Patented spread-spectrum charge-transfer (direct mode)
6mm x 6mm or larger (panel thickness dependent); widely different sizes and shapes possible
Solid or ring electrode shapes
One
Etched copper, silver, carbon, Indium Tin Oxide (ITO)
PCB, FPCB, plastic films, glass
Plastic, glass, composites, painted surfaces (low particle density metallic paints possible)
Up to 50mm glass, 20mm plastic (electrode size dependent)
Settable via external capacitor
Digital output, active high or active low (hardware configurable)
Good
2V ~ 5.5V; 23µA at 2V
SOT23-6 (3x3mm) RoHS compliant
Self-calibration, auto drift compensation, noise filtering
Power switch replacement in countertop appliances, irons, battery powered toys, heaters, lighting
controls, automotive interior lighting, commercial and industrial equipment such as soldering
stations and cooking equipment
QTouch™
(patented Charge-transfer method)
Patents:
AVAILABLE OPTIONS
T
A
SOT23-6
-40ºC to +85ºC
QT102-ISG
LQ
C
Copyright © 2007 QRG Ltd
QT102_2R3.04_0807
QUANTUM [ QUANTUM RESEARCH GROUP ]
