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SX8663 датащи(PDF) 18 Page - Semtech Corporation

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
Logo SEMTECH - Semtech Corporation

SX8663 датащи(HTML) 18 Page - Semtech Corporation

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ADVANCED COMMUNICATIONS & SENSING
Rev5 4
th August 2011
© 2011 Semtech Corp.
www.semtech.com
18
SX8663
Capacitive Button Matrix (up to 36) and Proximity Controller
with Individual LED Drivers and Buzzer Output
3.8
Processing
The first processing step of the raw ticks, coming out of the ASI, is low pass filtering to obtain an estimation of the
average capacitance: tick-ave (see Figure 13).
This slowly varying average is important in the detection of slowly changing environmental changes.
ticks (raw)
compensation DCV
ASI
processing
low pass
tick-diff
tick-ave
processing
GPIO
controller
PWM LED
controller
I2C
SPM
Figure 13
Processing
The difference of the tick average and the raw ticks, tick-diff, is a good estimation of rapid changing input
capacitances.
The tick-diff, tick-ave and the configuration parameters in the SPM are then processed and determines the sensor
information, I2C registers status and PWM control.
3.9
Configuration
Figure 14 shows the building blocks used for configuring the SX8663.
Figure 14
Configuration
The default configuration parameters of the SX8663 are stored in the Quick Start Memory (QSM). This
configuration data is setup to a very common application for the SX8663 with 8 buttons. Without any programming
or host interaction the SX8663 will start up in the Quick Start Application.
The QSM settings are fixed and cannot be changed by the user.



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