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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LAN8804/ZMXC1 датащи(PDF) 25 Page - Microchip Technology |
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LAN8804/ZMXC1 датащи(HTML) 25 Page - Microchip Technology |
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25 / 91 page  LAN8804 © 2024 Microchip Technology Inc. and its subsidiaries DS00003591G-page 25 3.3.5 LED POLARITY (PORT[3:0]_LED[2:1]_POL) The PORT[3:0]_LED[2:1]_POL configuration straps set the default polarity of the LED pins. When a LED pin is used as a function mode strap (for example a PHY address bit), the default LED pin polarity is automatically selected based on the inverse of the strap value. A LED, via a resistor, is then used as a pull-up or pull-down. This is shown in Figure 3-2. LED operation is described in Section 5.17, "LEDs". FIGURE 3-2: STRAP ON LED WITH POLARITY Functional Strap = 0 LED output = Active High (LEDPOL strap = 1) VDDIO Functional Strap = 1 LED output = Active Low (LEDPOL strap = 0) LED / strap pin LED / strap pin supplemental resistor to ensur e a valid low level dur ing strap load 220 220 10K 10K supplemental resistor to ensure a valid high level dur ing strap load |
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