ATAVRQTOUCHX Atmel, ATAVRQTOUCHX Datasheet - Page 134

• 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

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