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PM8803TR датащи(PDF) 20 Page - STMicroelectronics |
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PM8803TR датащи(HTML) 20 Page - STMicroelectronics |
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20 / 34 page ![]() PD interface PM8803 20/34 Doc ID 018559 Rev 2 A low T2P signal after the turn-on phase of the POE means that the PD is connected to a Type2, 2-event physical layer classification PSE which may allocate power either through further LLDP negotiation or directly feedthe PD with the required power. In isolated applications, the main circuits and the PM8803 are at both sides of the galvanic isolation. The T2P signal is normally connected to an optocoupler to pass the Type 2, 2-event PSE detection information to the main circuit in the PD system. Figure 7. T2P signal when connected to PSE supporting 1-event classification Figure 8. T2P signal when connected to PSE supporting 2-event classification Time Idle or Mark Range Classification Range On range Detection Time OUTPUT VOLTAGE Soft Start V Time T2P (802.3af) V T2P stable before output soft-start AM045097v1 Time Idle or Mark Range Classification Range On range Detection Time OUTPUT VOLTAGE Soft Start V Time T2P (802.3at) V T2P stable before output soft-start AM045098v1 |
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