QST108KT6 STMicroelectronics, QST108KT6 Datasheet - Page 12

• Manufacturer Part Number: QST108KT6
• Manufacturer: STMicroelectronics

Specifications of QST108KT6

• Lead Free Status / Rohs Status: Compliant

QST touch sensing technology
3.11
Note:
12/51
Figure 4
change.
Figure 4.
Adjacent key suppression (AKS™)
Adjacent key suppression (AKS™) is a Quantum-patented feature which prevents multiple
keys from responding to a single touch. This can happen with closely spaced keys, or a
scroll wheel that has buttons very near it.
The QST108 supports two AKS modes:
●
●
In I
All keys belonging to the same AKS group must have the same AKS mode.
2
C mode, up to 8 AKS groups can be specified.
Locking AKS
Once a key is considered as “touched”, all other keys are locked in an untouched state.
To unlock these keys, the touched key must return to an untouched state. Then, the key
having the lowest key ID number is declared as the “touched” one.
Unlocking AKS
On each acquisition, the signal strengths from each key are compared and the key with
the highest signal level is declared as the “touched” one.
illustrates an example of the drift compensation algorithm following a temperature
Drift compensation example
Temperature Change
Time
Drift Compensation
Reference Count + PosRelTh
Reference + DeTh
Reference Count
QST108