ATQT600 Atmel, ATQT600 Datasheet - Page 23

• 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

Values
HYST_50
HYST_25
HYST_12_5
HYST_6_25
5.6.3.2.5
Enumeration
Use
Values
RES_1_BIT
RES_2_BIT
RES_3_BIT
RES_4_BIT
RES_5_BIT
RES_6_BIT
RES_7_BIT
RES_8_BIT
5.6.3.2.6
Enumeration
Use
resolution_t
recal_threshold_t
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
8 bit resolution : reported positions range 0 – 255
Comment
50% Hysteresis
25% Hysteresis
12.5% Hysteresis
6.25% Hysteresis
HYST_x = hysteresis value is x percent of detection threshold value (rounded
down).
Note that a minimum value of 2 is used as a hard limit. Example: if detection
threshold = 20, then:
HYST_50 = 10 (50 percent of 20)
HYST_25 = 5 (25 percent of 20)
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)
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.
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)
= 20 ( 50 percent of 40)
= 10 ( 25 percent of 40)
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