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LAN8710A-EZC 데이터시트(PDF) 39 Page - SMSC Corporation |
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LAN8710A-EZC 데이터시트(HTML) 39 Page - SMSC Corporation |
39 / 82 page Small Footprint MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX and flexPWR® Technology Datasheet SMSC LAN8710A/LAN8710Ai 39 Revision 1.4 (08-23-12) DATASHEET 3.8 Miscellaneous Functions 3.8.1 LEDs Two LED signals are provided as a convenient means to determine the transceiver's mode of operation. All LED signals are either active high or active low as described in Section 3.8.1.2, "nINTSEL and LED2 Polarity Selection" and Section 3.8.1.1, "REGOFF and LED1 Polarity Selection," on page 39. The LED1 output is driven active whenever the device detects a valid link, and blinks when CRS is active (high) indicating activity. The LED2 output is driven active when the operating speed is 100Mbps. This LED will go inactive when the operating speed is 10Mbps or during line isolation. Note: When pulling the LED1 and LED2 pins high, they must be tied to VDD2A, NOT VDDIO. 3.8.1.1 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 3.7 details the LED1 polarity for each REGOFF configuration. Note: Refer to Section 3.7.4, "REGOFF: Internal +1.2V Regulator Configuration," on page 38 for additional information on the REGOFF configuration strap. 3.8.1.2 nINTSEL and LED2 Polarity Selection The nINTSEL configuration strap is shared with the LED2 pin. The LED2 output will automatically change polarity based on the presence of an external pull-down resistor. If the LED2 pin is pulled high to VDD2A to select a logical high for nINTSEL, then the LED2 output will be active low. If the LED2 Figure 3.7 LED1/REGOFF Polarity Configuration LED1/REGOFF ~270 ohms REGOFF = 0 (Regulator ON) LED output = Active High ~270 ohms VDD2A REGOFF = 1 (Regulator OFF) LED output = Active Low LED1/REGOFF 10K |
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