ATAVRQTOUCHX Atmel, ATAVRQTOUCHX Datasheet - Page 134
ATAVRQTOUCHX
Manufacturer Part Number
ATAVRQTOUCHX
Description
BOARD EVAL CAPACITIVE TOUCH
Manufacturer
Atmel
Series
QTouch™r
Specifications of ATAVRQTOUCHX
Sensor Type
Touch, Capacitive
Sensing Range
1 Slider, 1 Wheel, 2 Buttons
Interface
USB
Voltage - Supply
5V, USB
Embedded
Yes, MCU, 8-Bit
Utilized Ic / Part
AT90USB1287, ATxmega128A1
Silicon Manufacturer
Atmel
Silicon Family Name
ATxmega
Kit Contents
Board
Svhc
No SVHC (15-Dec-2010)
Core Architecture
AVR
Core Sub-architecture
AVR19
Kit Features
One Slider, One Wheel And 2
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Sensitivity
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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Values
HYST_50
HYST_25
HYST_12_5
HYST_6_25
6.3.15.2.7 recal_threshold_t
Enumeration
Use
Values
RECAL_100
RECAL_50
RECAL_25
RECAL_12_5
RECAL_6_25
6.3.15.2.8 resolution_t
Enumeration
Use
Values
RES_1_BIT
RES_2_BIT
RES_3_BIT
RES_4_BIT
RES_5_BIT
RES_6_BIT
RES_7_BIT
134
HYST_12_5 = 2 (12.5 percent of 20)
HYST_6_25 = 2 (6.25 percent of 20 = 1, but set to the hard limit of 2)
recal_threshold_t
A sensor recalibration threshold. This is expressed as a percentage of the
sensor detection threshold.
This is for automatic recovery from false conditions, such as a calibration while
sensors were touched, or a significant step change in power supply voltage.
If the false condition persists the library will recalibrate according to the settings
of the recalibration threshold.
This setting is applicable to all the configured sensors.
Usage :
RECAL_x = recalibration threshold is x percent of detection threshold value
(rounded down).
Note: a minimum value of 4 is used.
Example: if detection threshold = 40, then:
RECAL_100 = 40 ( 100 percent of 40)
RECAL_50
RECAL_25
RECAL_12_5 = 5 ( 12.5 percent of 40)
RECAL_6_25 = 4 ( 6.25 percent of 40 = 2, but value is limited to 4)
resolution_t
For rotors and sliders, the resolution of the reported angle or position.
RES_x_BIT = rotor/slider reports x-bit values.
Example: if slider resolution is RES_7_BIT, then reported positions are in the
range 0..127.
Comment
1 bit resolution : reported positions range 0 – 1
2 bit resolution : reported positions range 0 – 3
3 bit resolution : reported positions range 0 – 7
4 bit resolution : reported positions range 0 – 15
5 bit resolution : reported positions range 0 – 31
6 bit resolution : reported positions range 0 – 63
7 bit resolution : reported positions range 0 – 127
= 20 ( 50 percent of 40)
= 10 ( 25 percent of 40)
12.5% recalibration threshold
6.25% recalibration threshold
Comment
100% recalibration threshold
50% recalibration threshold
25% recalibration threshold
Comment
50% Hysteresis
25% Hysteresis
12.5% Hysteresis
6.25% Hysteresis
8207J-AT42-02/11
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