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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SX8661 датащи(PDF) 24 Page - Semtech Corporation |
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SX8661 датащи(HTML) 24 Page - Semtech Corporation |
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24 / 88 page  ADVANCED COMMUNICATIONS & SENSING DATASHEET Revision v3.2, January 2011 © 2011 Semtech Corp. www.semtech.com 24 SX8661 Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output 3.11 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 19). 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 19 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. 3.12 Configuration Figure 20 shows the building blocks used for configuring the SX8661. Figure 20 Configuration The default configuration parameters of the SX8661 are stored in the Quick Start Memory (QSM). This configuration data is setup to a very common application for the SX8661 with 8 buttons. Without any programming or host interaction the SX8661 will start up in the Quick Start Application. The QSM settings are fixed and cannot be changed by the user. |
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