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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) 30 Page - Semtech Corporation |
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SX8661 датащи(HTML) 30 Page - Semtech Corporation |
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30 / 88 page  ADVANCED COMMUNICATIONS & SENSING DATASHEET Revision v3.2, January 2011 © 2011 Semtech Corp. www.semtech.com 30 SX8661 Low Power, Capacitive Button Touch and Proximity Controller (8 sensors) with LED Drivers and Analog Output 3.18 General Purpose Input and Outputs The SX8661 offers eight General Purpose Input and Outputs (GPIO) pins which can be configured in any of these modes: - GPP (General Purpose PWM) - GPO (General Purpose Output) - SPO (Special Purpose Output) The input state of the GPIO is only used during the initial phase of the power up period. Each of these GPIO modes is described in more details in the following sections. The polarity of the GPP and GPO pins is defined as in figure below, driving an LED as example. It has to be set accordingly in SPM parameter GpioPolarity. Figure 28 polarity = 1 (a), polarity = 0 (b) The PWM blocks used in GPP and GPO modes are 8-bits based and clocked at 2MHz typ. hence offering 256 selectable pulse width values with a granularity of 0.5us typ. Figure 29 PWM definition, (a) small pulse width, (b) large pulse width 3.18.1 GPP mode GPIOs configured as GPP will operate as PWM outputs directly controlled by the host. A typical application is LED dimming. Typical GPP operation is illustrated in figure below. |
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