AT42QT1010-12 Brief Datasheet by Microchip Technology

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Single Key Capacitive Touch Controllers
The AT42QT101x single key capacitive touch controller family provide touch key replacements
for mechanical buttons. The ICs are low cost, and as such can be added to designs with minimal
impact on the bill of materials.
Each Device has Different Operation:
n2.9 mm x 1.6 mm SOT-23 package
nLow power consumption (17 µA at 1.8V)
nLow cost
nEasy to implement
nRange of response speed settings
nCan be configured for use as a proximity sensor
nAT42QT1010 (QT1010)
Single key with timer to reset “stuck key” condition.
nAT42QT1011 (QT1011)
Single key with no reset timer.
nAT42QT1012 (QT1012)
Single key with touch-on/touch off or “toggle” operation and power down timer
Specifications
The Devices have the following Features in Common
ree speed semngs owed, a fast response semng is availame WM 5122 ms maxrrnurn response hme, Low power consomphon. at the expense of a sLower response hrne of up to 88,5 rns ce to an externaL dock wnrch makes rt possrme to synchronize severaL \Cs in the same hance horse immumtv or svncmg to a norse Source such as mains The response hme
The AT42QT1010 and AT42QT1011 have three speed settings:
nFor devices where a quick response is required, a fast response setting is available with a 12.2 ms maximum response time.
n It is also possible to set up the device for low power consumption, at the expense of a slower response time of up to 88.6 ms.
n A third option is to synchronize the device to an external clock which makes it possible to synchronize several ICs in the same
device. This technique can be used to enhance noise immunity by syncing to a noise source such as mains. The response time
is then dependent on the external clock.
When the device is in low power mode or when the synchronisation mode is selected, a HeartBeat™ output
is available. This provides a pulse whilst the device isn’t in detect which can be used to verify the device is
working correctly.
AT42QT1011
Single button or
proximity sensor
No power down, remains
active while touch present
AT42QT1012
Single button or
proximity sensor
Toggle (touch on/off)
functionality
Power down after
configurable time period
AT42QT1010
Single button or
proximity sensor
Prolonged touch
timeout after
60 seconds
Single-Key Touch Controllers
2
The AT42QT1010 and AT42QT1011 are identical apart from their behavior
when the sensor is “in detect” for an extended period.
The AT42QT1010 has a “maximum on” duration of ~ 60s. If there is an ob-
struction on the sensor, the device output will go low after the “maximum
on” detection period, so that subsequent touches can be detected.
The AT42QT1011 has no timer and the device will remain on whilst the
sensor is activate.
Speed Settings
AT42QT1012
The device is similar to the AT42QT1010 and AT42QT1011 but it has touch-on/touch-off (toggle) functionality and a power down
timer.
Auto Off Timers
The QT1012 has a number of options for automatic power down which can be used to conserve power in situations where the
device could be left on inadvertently. There are predefined power down settings which can be used to power the device down after
15 minutes or 60 minutes. There is also the option for no power down timer so the device remains on until touched again.
AT42QT1010 and AT42QT1011
go acuve on mtended touches the \CS mdude swgnal processm etecmcat nowse afld qmck brushes W‘th the Surface ‘1‘ a cations
www.atmel.com/singletouch
3
Standard Features
The following functionality is common to all three ICs in the AT42QT101X family.
Drift Compensation
Drift compensation algorithms constantly adjust the reference level in the device to ensure that the key will remain
calibrated even if there is a large change in background capacitance.
Spread Spectrum Acquisition
The devices modulate their frequency whilst measurements are taken. This has the effect of reducing emission levels
and susceptibility to interference as there is no single burst frequency.
Power Consumption
All the devices have a range of power modes depending on the response time required. The power consumption is
kept to a minimum whatever power mode the device is in. This, combined with the auto-off functionality available on
the QT1012 means that for portable devices, adding capacitive sensing functionality does not significantly impact on
the battery lifetime.
Sensitivity
By careful capacitor selection and key design, the sensitivity of a capacitive button can be set to work with a wide
range of panel thicknesses and materials. As the sensitivity of the key can be varied significantly it is also possible to
use any of the single key devices as proximity sensors. Such functionality can be used in toys or used to illuminate “hid
den until lit” user interfaces.
Calibration
The device will automatically calibrate on power up. If there is an obstruction on the key for a prolonged period, the
sensor will re-calibrate after a set time period (with the exception of the QT1011, which will indicate a touch condition
as long as the sensor is “in detect”). This ensures that the device will detect a new touch correctly.
Detection
In order for the sensors to only go active on intended touches, the ICs include signal processing which helps to
suppress detections caused by electrical noise and quick brushes with the surface.
nPower switches
nHearing aids
nIsolated buttons/sensors
nChildren’s toy
nTimers
nProximity sensors
Typical Applications
Am
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Rev.: 8287A-AT42-02/10
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Recommended Operating
Conditions
AT42QT1010 AT42QT1011 AT42QT1012
Power Supply 1.8V-5.5V 1.8V-5.5V 1.8V-5.5V
Power Supply Ripple + Noise 20 mV 20 mV 20mV
Environmental Specifications
Operating Temperature -40 to 85ºC -40 to 85ºC -40 to 85ºC
Storage Temperature -65 to 150ºC -65 to 150ºC -65 to 150ºC
DC Specifications
Supply Current (Slow mode) 17 µA 17 µA 31.5 µA
Supply Current (Fast mode) 219 µA
(1.8V Supply Current)
219 µA
(1.8V Supply Current)
N/A
Package Options
6-pin 2.9 mm x 1.6 mm
SOT-23
2.9 mm x 1.6 mm
SOT-23
2.9 mm x 1.6 mm
SOT-23
System
Number of Keys 1
Number of I/O lines 1 output channel
Key outline sizes 6 mm x 6 mm recommended or arbitrary shape
Signal processing Noise filtering, self calibration on startup, automatic drift compensation
Visit http://www.atmel.com/singletouch for more information
http://www.atmel.com/touch
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