QT1081 Datasheet, PDF (4/20 Pages) Quantum Research Group – 8-KEY QTOUCH SENSOR IC

The QT1081 has two different AKS groupings of keys,
selectable via option resistors. These groupings are:
y AKS operates in two groups of four keys.
y AKS operates over all eight keys.
These two modes allow the designer to provide AKS while
also providing for shift or function operations.
If AKS is disabled, all keys can operate simultaneously.
1.2.11 Outputs
There are two output modes: one-per-key, and binary coded.
One-per-key output: In this mode there is one output pin per
key. This mode has two output drive options, push-pull and
open-drain. The outputs can also be made either active-high
or active-low. These options are set via external configuration
resistors.
Binary coded output: In this mode, three output lines encode
for one possible key in detect. If more than one key is
detecting, only the first one touched will be indicated.
1.2.12 Simplified Mode
To reduce the need for option resistors, the simplified
operating mode places the part into fixed settings with only the
AKS feature being selectable. LP mode is also possible in this
configuration. Simplified mode is suitable for most
applications.
lQ
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QT1081_1R0.04_0307