ATQT600 Atmel, ATQT600 Datasheet - Page 16
ATQT600
Manufacturer Part Number
ATQT600
Description
KIT EVAL TOUCH FOR QT600
Manufacturer
Atmel
Series
QTouch™r
Specifications of ATQT600
Sensor Type
Touch Screen
Interface
USB
Embedded
Yes, Other
Utilized Ic / Part
ATtiny88, ATmega324PA, ATxmega128A1
Processor To Be Evaluated
ATtiny88, ATmega324, ATxmega128
Data Bus Width
8 bit, 16 bit
Interface Type
USB
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Operating Supply Voltage
1.6 V to 3.6 V
Silicon Manufacturer
Atmel
Kit Application Type
Sensor
Application Sub Type
Touch Sensor
Kit Contents
USB Bridge, MCU Cards, Touchpad Cards
Svhc
No SVHC (15-Dec-2010)
Mcu Supported Families
ATtiny88,
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Supply
-
Sensitivity
-
Sensing Range
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATQT600
Manufacturer:
Atmel
Quantity:
135
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For example, if recalibration threshold (one of the global settings) of QMatrix acquisition method
is set as 1, all QMatrix sensors will have recalibration threshold of 1.
5.3.1
Recalibration threshold is the level above which automatic recalibration occurs. Recalibration
threshold is expressed as a percentage of the detection threshold setting. This setting is an
enumerated value and its settings are as follows:
However, an absolute value of 4 is the hard limit for this setting. For example, if the detection
threshold is say, 40 and the Recalibration threshold value is set to 4. This implies an absolute
value of 2 (40 * 6.25% = 2.5), but this is hard limited to 4.
Setting
Recalibration threshold
5.3.2
The QTouch Library features a detect integration mechanism, which acts to confirm detection in a
robust fashion. The detect integrator (DI) acts as a simple signal filter to suppress false detections
caused by spurious events like electrical noise.
A counter is incremented each time the sensor delta has exceeded its threshold and stayed there
for a specific number of acquisitions, without going below the threshold levels. When this counter
reaches a preset limit (the DI value) the sensor is finally declared to be touched. If on any
acquisition the delta is not seen to exceed the threshold level, the counter is cleared and the
process has to start from the beginning. The DI process is applicable to a ‘release’ (going out of
detect) event as well.
For example, if the DI value is 10, then the device has to exceed its threshold and stay there for
10 acquisitions in succession without going below the threshold level, before the sensor is
declared to be touched.
Setting
5.3.3
Drift Hold Time (DHT) is used to restrict drift on all sensors while one or more sensors are
activated. It defines the length of time the drift is halted after a key detection.
16
•
•
•
•
•
Recalibration Threshold
Setting of 0 = 100% of detect threshold (RECAL_100)
Setting of 1 = 50% of detect threshold (RECAL_50)
Setting of 2 = 25% of detect threshold (RECAL_25)
Setting of 3 = 12.5% of detect threshold (RECAL_12_5)
Setting of 4 = 6.25% of detect threshold (RECAL_6_25)
Detect Integration
DI
Drift Hold Time
Variable
name
qt_di
Variable name
qt_recal_threshold
Data Type
uint8_t
Unit
Data
Type
uint8_t
Cycles
Unit
Enum
Min
Min Max
4
0
8207J-AT42-02/11
Detect
threshold
Max
255
Typical
1
Typical
4
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