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SX8661Z датащи(PDF) 22 Page - Semtech Corporation

номер детали SX8661Z
подробное описание детали  Low Power, Capacitive Button Touch and Proximity Controller with LED Drivers and Analog Output
PDF  87 Pages
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производитель  SEMTECH [Semtech Corporation]
домашняя страница  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SX8661Z датащи(HTML) 22 Page - Semtech Corporation

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ADVANCED COMMUNICATIONS & SENSING
DATASHEET
Revision v4.0, February 2016
© 2012 Semtech Corp.
www.semtech.com
22
SX8661Z
Low Power, Capacitive Button Touch and Proximity Controller
(8 sensors) with LED Drivers and Analog Output
3.10 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 17).
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 17
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.
3.11 Configuration
Figure 18 shows the building blocks used for configuring the SX8661Z.
micro
processor
MTP
NVM
I2C
SX8661Z
HOST
SPM
QSM
Figure 18
Configuration
The default configuration parameters of the SX8661Z are stored in the Quick Start Memory (QSM). This
configuration data is setup to a very common application for the SX8661Z with 8 buttons. Without any
programming or host interaction the SX8661Z will start up in the Quick Start Application.
The QSM settings are fixed and cannot be changed by the user.



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