E401 KIT Atmel, E401 KIT Datasheet - Page 7

• Manufacturer Part Number: E401 KIT
• Description: KIT EVAL FOR QT401-IS QSLIDE
• Manufacturer: Atmel
• Series: Quantumr

Specifications of E401 KIT

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 427-1084

Prox Detection indicates that the
board has detected a hand at a
distance.
The Prox value sets the threshold
which will cause the chip to register
proximity; lower numbers are more
sensitive. Default = 3
Calibration should be performed with
the PCB in the intended position in
which it will be used, with hands at a
distance, to get a valid reference level.
Once positioned, the board should be
calibrated using the Fixed Cal button.
Note: Fixed Cal must precede Adap-
tive Cal, otherwise the end calibrations
will be inaccurate.
Clicking Fixed Cal alone will cancel
Adaptive Cal.
If the board is moved it may need to
be recalibrated.
If any status flags are set prior to
operation then calibration should
be repeated.
Clicking Adaptive Cal causes the
E401 to match the electrical end-
points to the physical ends using a
special calibration process.
Do this only after clicking Fixed Cal.
Slider Bar shows the reported position of
touch. This bar does not move when only
proximity is detected. It will lock on the
last reported position after touch is lifted.
Slider Detection indicates that the
board is detecting a finger touch.
Changing the associated threshold
sets the amount of signal change
which will cause the E401 to register
touch. Default = 25
Signal Error indicates that the signal
has the wrong polarity, usually due to
board movement.
Clicking the Fixed Cal then
Adaptive Cal buttons will resolve the
error.
Drift Rate sets the adaptive drift
compensation rate; the numbers
represent seconds per
compensation.
Output Ratio shows the numerical
slider position, from 0 (left) to 127
(right).
Command Return represents the
QT401’s response status byte in
hexadecimal. This is useful for
diagnostic purposes.
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