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hysteresis value) in order to avoid the sensor dither in and out of detect if the signal level is close
to original threshold level.
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Setting of 0 = 50% of detect threshold value (HYST_50)
Setting of 1 = 25% of detect threshold value (HYST_25)
Setting of 2 = 12.5% of detect threshold value (HYST_12_5)
Setting of 3 = 6.25% of detect threshold value (HYST_6_25)
Setting
Hysteresis
Variable name
detect_hysteresis
Data Type
uint8_t (2 bits)
Unit
Enum
Min
HYST_6_25
Max
HYST_50
Typical
HYST_6_25
5.4.3 Position Resolution
The rotor or slider needs the position resolution (angle resolution in case of rotor and linear
resolution in case of slider) to be set. Resolution is the number of bits needed to report the
position of rotor or slider. It can have values from 2bits to 8 bits.
Setting
Variable
Data
Unit
Min
Reported
Max
Reported
Typica
name
Type
position
position
l
Position
position_
uint8_t
-
2 bits
0–3
8 bits
0-255
8
Resoluti
resolution
(3 bits)
on
5.4.4 Position Hysteresis
In case of QMatrix, the rotor or slider needs the position hysteresis (angle hysteresis in case of
rotor and linear hysteresis in case of slider) to be set. It is the number of positions the user has to
move back, before touch position is reported when the direction of scrolling is changed and
during the first scrolling after the touch down.
Hysteresis can range from 0 (1 position) to 7 ( 8 positions). The hysteresis is carried out at 8 bits
resolution internally and scaled to desired resolution; therefore at resolutions lower than 8 bits
there might be a difference of 1 reported position from the hysteresis setting, depending on where
the touch is detected.
At lower resolutions, where skipping of the reported positions is observed, hysteresis can be set
to 0 (1 position). At Higher resolutions (6 ..8bits) , it would be recommended to have a hysteresis
of at least 2 positions or more.
NOTE:
It is not valid to have a hysteresis value more than the available bit positions in the resolution.
Ex: do not have a hysteresis value of 5 positions with a resolution of 2 bits (4 positions).
Setting
Position
Variable name
position_hysteresis
Data Type
uint8_t (3 bits)
Unit
-
Min
0
Max
7
Typical
3
Hysteresis
NOTE:
Position hysteresis is not valid (unused) in case of QTouch acquisition method libraries.
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