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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LAN8740 датащи(PDF) 38 Page - Microchip Technology |
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LAN8740 датащи(HTML) 38 Page - Microchip Technology |
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38 / 136 page  LAN8740A/LAN8740Ai DS00001987A-page 38 2013-2015 Microchip Technology Inc. 3.8.1.4 LED2/nINT/nPME Usage with nINTSEL Disabled When the LED2/nINT/nPME/nINTSEL pin is low during reset, the nINT/TXER/TXD4 pin is configured to function as TXER/TXD4. After the deassertion of reset, this pin will first function as LED2. Upon configuration, it can function as nINT or nPME. Figure 3-10 illustrates the steps required to program the LED2 pin as nINT or nPME with nINTSEL dis- abled. In this configuration, it is not recommended to connect an LED to this pin. Because this pin is active high, the LED will be lit while waiting for a WoL event. 3.8.1.5 REGOFF and LED1 Polarity Selection The REGOFF configuration strap is shared with the LED1 pin. The LED1 output will automatically change polarity based on the presence of an external pull-up resistor. If the LED1 pin is pulled high to VDD2A by an external pull-up resistor to select a logical high for REGOFF, then the LED1 output will be active low. If the LED1 pin is pulled low by the internal pull-down resistor to select a logical low for REGOFF, the LED1 output will then be an active high output. Figure 3-11 details the LED1 polarity for each REGOFF configuration. FIGURE 3-10: LED2/nINT/nPME WITH nINTSEL DISABLED FIGURE 3-11: LED1/REGOFF POLARITY CONFIGURATION Note: Refer to Section 3.7.4, "REGOFF: Internal +1.2 V Regulator Configuration" for additional information on the REGOFF configuration strap. nRST LED2/nINT/ WUCSR[12:11] Link Speed nINT/nPME 00b 01b/10b nPME/nINTSEL LED1/REGOFF ~270 REGOFF = 0 (Regulator ON) LED output = Active High ~270 VDD2A REGOFF = 1 (Regulator OFF) LED output = Active Low LED1/REGOFF 10K |
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