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QST108 bảng dữ liệu(PDF) 12 Page - STMicroelectronics

tên linh kiện QST108
Giải thích chi tiết về linh kiện  Capacitive touch sensor device 8 keys with individual key state outputs or I2C interface
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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QST108 bảng dữ liệu(HTML) 12 Page - STMicroelectronics

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QST touch sensing technology
QST108
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Figure 4 illustrates an example of the drift compensation algorithm following a temperature
change.
Figure 4.
Drift compensation example
3.11
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:
●
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.
In I2C mode, up to 8 AKS groups can be specified.
Note:
All keys belonging to the same AKS group must have the same AKS mode.
Reference + DeTh
Reference Count
Reference Count + PosRelTh
Time
Drift Compensation
Temperature Change



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