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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PM8800ATR датащи(PDF) 16 Page - STMicroelectronics |
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PM8800ATR датащи(HTML) 16 Page - STMicroelectronics |
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16 / 35 page  PD interface PM8800A 16/35 5 PD interface 5.1 Detection In power over Ethernet systems, the PSE senses the connection to detect whether an IEEE 802.3af compatible device is plugged to the cable termination by applying a small voltage (2.7 to 10 V) on the Ethernet cable and measuring in two successive steps the equivalent resistance. During this phase, the Powered Device must present a resistance between 23.75 k Ω and 26.25 kΩ PM8800A integrates a 24.5 k Ω signature resistor to simplify the design of PoE powered Device appliances and to reduce the overall component count. Signature resistor is in series to a pass transistor (see Figure 7) used to disconnect the resistor itself upon completion of the detection phase. The value of the integrated detection resistance has been selected taking into account also the diode bridges typical voltage drop. During detection, most of the circuits inside the PM8800A are disabled to minimize the offset current. Figure 7. PM8800A: reference schematic of the integrated 24.5 k Ω and resistor disable logic 24.5k + - VIN VSS 11.5V PM8800A |
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