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LAN8710A-EZC 데이터시트(PDF) 40 Page - SMSC Corporation |
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LAN8710A-EZC 데이터시트(HTML) 40 Page - SMSC Corporation |
40 / 82 page Small Footprint MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX and flexPWR® Technology Datasheet Revision 1.4 (08-23-12) 40 SMSC LAN8710A/LAN8710Ai DATASHEET pin is pulled low by an external pull-down resistor to select a logical low for nINTSEL, the LED2 output will then be an active high output. Figure 3.8 details the LED2 polarity for each nINTSEL configuration. Note: Refer to Section 3.7.5, "nINTSEL: nINT/TXER/TXD4 Configuration," on page 38 for additional information on the nINTSEL configuration strap. 3.8.2 Variable Voltage I/O The device’s digital I/O pins are variable voltage, allowing them to take advantage of low power savings from shrinking technologies. These pins can operate from a low I/O voltage of +1.62V up to +3.6V. The applied I/O voltage must maintain its value with a tolerance of ± 10%. Varying the voltage up or down after the transceiver has completed power-on reset can cause errors in the transceiver operation. Refer to Chapter 5, "Operational Characteristics," on page 66 for additional information. Note: Input signals must not be driven high before power is applied to the device. 3.8.3 Power-Down Modes There are two device power-down modes: General Power-Down Mode and Energy Detect Power- Down Mode. These modes are described in the following subsections. 3.8.3.1 General Power-Down This power-down mode is controlled via the Power Down bit of the Basic Control Register. In this mode, the entire transceiver (except the management interface) is powered-down and remains in this mode as long as the Power Down bit is “1”. When the Power Down bit is cleared, the transceiver powers up and is automatically reset. 3.8.3.2 Energy Detect Power-Down This power-down mode is activated by setting the EDPWRDOWN bit of the Mode Control/Status Register. In this mode, when no energy is present on the line the transceiver is powered down (except for the management interface, the SQUELCH circuit, and the ENERGYON logic). The ENERGYON logic is used to detect the presence of valid energy from 100BASE-TX, 10BASE-T, or Auto-negotiation signals. In this mode, when the ENERGYON bit of the Mode Control/Status Register is low, the transceiver is powered-down and nothing is transmitted. When energy is received via link pulses or packets, the ENERGYON bit goes high and the transceiver powers-up. The device automatically resets into the Figure 3.8 LED2/nINTSEL Polarity Configuration ~270 ohms nINTSEL = 0 LED output = Active High 10K ~270 ohms VDD2A nINTSEL = 1 LED output = Active Low LED2/nINTSEL LED2/nINTSEL |
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