SX8663 datasheet(12/64 Pages) SEMTECH

номер детали	SX8663

подробное описание детали	Capacitive Button Matrix (up to 36) and Proximity Controller with Individual LED Drivers and Buzzer Output

PDF	64 Pages

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производитель	SEMTECH [Semtech Corporation]

домашняя страница	http://www.semtech.com

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ADVANCED COMMUNICATIONS & SENSING

Rev5 4

th August 2011

www.semtech.com

SX8663

Capacitive Button Matrix (up to 36) and Proximity Controller

with Individual LED Drivers and Buzzer Output

Figure 7

Operation modes

3.4

Sensors on the PCB

3.4.1

Matrix Keys/Buttons (MK)

In opposition to most of the other Semtech capacitive sensing products where 1 button = 1 sensor

(CAP0…CAP11)., the SX8663 requires sensors to be routed in matrix and each button is formed by the

intersection/concatenation of two sensors areas. The buttons are covered by isolating overlay material (typically

1mm...3mm). The area of a button is typically one square centimetre which corresponds about to the area of a

finger touching the overlay material.

Figure 8

Matrix Buttons Layout/Connections (Red = Top; Brown = Inner1; Blue = Inner2)

IMPORTANT: Please note that while the matrix structure allows increasing dramatically the potential maximum

number of buttons (up to 36 with only 12 sensors) it also limits the operation to max one matrix button reported at

a time (ie single button touch operation). When several matrix buttons are touched only the first one is reported.

3.4.2

Priority Key/Button (PK)

When the priority key is enabled in BtnCfg[6], CAP11 (or CAP10 if PS=ON) can be routed outside the matrix to a

separate standard button sensor. Matrix size is then reduced to 6x5 keys (or 5x5 if PS is ON). Priority key

operation/reporting is independent from the matrix and can be used for any “high priority” key (Power, Reset, etc)

or “multi-touch” function (Shift, Alt, etc).

SX8663 датащи(PDF) 12 Page - Semtech Corporation