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AT42QT1110-MU / AT42QT1110-AU [DATASHEET]
9520J–AT42–05/2013
Note that the keys are independent of each other. It is therefore possible, for example, to have a signal of 100 on one
key and a signal of 1000 on another.
4.11.3 Adjacent Key Suppression Technology
The device includes the Atmel patented Adjacent Key Suppression (AKS) technology to allow the use of tightly
spaced keys on a keypad with no loss of selectability by the user.
AKS is enabled or disabled for each key individually; only one key out of those enabled for AKS may be reported as
touched at any one time. The first key touched dominates and stays in detect until it is released, even if another
stronger key is reported. Once it is released, the next strongest key is reported. If two keys are simultaneously
detected, the strongest key is reported, allowing a user to slide a finger across multiple keys with only the dominant
key reporting touch.
Each key can be enabled for AKS processing via the AKS mask (see Section 7.11 on page 33). Keys outside the
group of enabled keys may be in detect simultaneously.
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