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VSC8540RT 数据表(PDF) 68 Page - Microchip Technology |
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VSC8540RT 数据表(HTML) 68 Page - Microchip Technology |
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68 / 87 page ![]() VSC8540RT DS60001603E-page 68 2022 Microchip Technology Inc. and its subsidiaries 8.3.10 THERMAL DIODE The device includes an on-die diode and internal circuitry for monitoring die temperature (junction temperature). The operation and accuracy of the diode is not guaranteed and should only be used as a reference. The on-die thermal diode requires an external thermal sensor, located on the board or in a stand-alone measurement kit. Temperature measurement using a thermal diode is very sensitive to noise. The following illustration shows a generic application design. FIGURE 8-1: THERMAL DIODE Note: Microchip does not support or recommend operation of the thermal diode under reverse bias. The following table provides the diode parameter and interface specifications with the pins connected internally to VSS in the device. TABLE 8-13: CURRENT CONSUMPTION (VDDMAC) Mode Typical (mA) VDDMAC (Nominal, room temp) Maximum (mA) VDDMAC (Vdd max, Tamb = 125 °C) 1.5V 1.8V 2.5V 3.3V 1.575V 1.89V 2.62V Reset < 1 < 1 < 1 1 < 1< 1< 1 < 1 Power Down < 11 < 11 < 11 11 6†2 72 102 132 ActiPHY < 11 11 11 11 72 82 112 142 No Link < 11 11 11 11 < 11 11 11 11 MII(100BASE-TX) 6 7 10 12 7 8 11 15 MII(10BASE-T/Te) 1 2 3 3 2 2 3 4 RGMII (100BASE-TX) 5 6 8 10 6 7 10 12 RGMII (10BASE-T/Te) 1 1 2 2 1 2 2 3 RMII (100BASE-TX) 8 10 14 16 9 11 15 22 RMII (10BASE-T/Te) 6 7 10 12 7 8 11 14 1. GMII/MII/RMII †2. RGMII TABLE 8-14: POWER CONSUMPTION Parameter Symbol Typical Maximum Unit Worst-case power consumption PD 400 mW TABLE 8-15: THERMAL DIODE PARAMETERS Parameter Symbol Typical Maximum Unit Forward bias current IFW See note1 1. Typical value is device dependent. 1mA Diode ideality factor n 1.008 |
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