ATEVK1012A Atmel, ATEVK1012A Datasheet - Page 3

• Manufacturer Part Number: ATEVK1012A
• Description: BOARD EVAL FOR AT42QT1012A
• Manufacturer: Atmel
• Series: QTouch™r
• Type: Touch Button Cr

Specifications of ATEVK1012A

• Sensor Type: Touch, Capacitive
• Sensing Range: 1 Button/Key
• Utilized Ic / Part: AT42QT1012
• Silicon Manufacturer: Atmel
• Kit Application Type: Sensor
• Application Sub Type: Touch Key
• Kit Contents: Board
• Svhc: No SVHC (15-Dec-2010)
• Mcu Supported Families: AT42QT1012A
• Rohs Compliant: Yes
• Tool Type: Development Kit
• Cpu Core: AVR 8 / 32
• Data Bus Width: 8 bit, 32 bit
• Core Architecture: AVR
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Supply: -
• Interface: -
• Sensitivity: -
• Embedded: -
• Lead Free Status / Rohs Status: Details

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.
Typical Applications
n Power switches
n Hearing aids
n Isolated buttons/sensors
n Children’s toy
n Timers
n Proximity sensors