AT42QT1111-MU datasheet(21/50 Pages) ATMEL

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AT42QT1111-MU Datasheet(PDF) 21 Page - ATMEL Corporation

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9571A–AT42–02/10

AT42QT1111-MU/AT42QT1111-AU

4.11.2

Burst Length Limitations

The maximum burst length is 2048 pulses. The recommended design is to use a capacitor that

gives a signal of <1000 pulses.

The number of pulses in the burst can be obtained by reading the key signal (that is, the number

of pulses to complete measurement of the key’s signal) over the SPI interface (see Section 6.8

on page 26). Alternatively, a scope can be used to measure the entire burst, and then the burst

length divided by the time for a single pulse.

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 Atmel’s 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.

Manufacturer	Part #	Datasheet	Description
ATMEL Corporation	AT42QT1111-MU	695Kb / 50P	11-key QTouch Touch Sensor IC

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