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PM8801 bảng dữ liệu(PDF) 20 Page - STMicroelectronics

tên linh kiện PM8801
Giải thích chi tiết về linh kiện  High-efficiency, IEEE 802.3at compliant, integrated PoE-PD interface and PWM controller
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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PM8801 bảng dữ liệu(HTML) 20 Page - STMicroelectronics

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DocID018560 Rev 2
Figure 6. PM8801: reference schematic of the PoE classification logic
The classification resistor can be disconnected for the following reasons:
–
the classification has been successfully completed
–
an auxiliary power source has been connected
–
the device is in thermal protection.
Designers can set the current by changing the value of the external resistor according to the
following table.
4.3
Indication of successful 2-event classification
PM8801 is capable of recognizing whether it is connected to a PSE performing physical
layer classification by asserting the T2P signal.
T2P is an open-drain, active-low signal which is pulled down in case a successful 2-event
classification event is completed.
T2P will be asserted as soon as the high-voltage startup regulator output is stable (see
Figure 7 and Figure 8 for timing sequences). If PM8801 sees a 1-event classification or no
classification, T2P is pulled up and the main circuit in the PD can try to establish an LLDP
connection to negotiate the power. No LLDP response from the PSE means that the PD is
connected to a Type1 PSE, and only 13 W input power will be available.
Table 7. Value of the external classification resistor for the different PD classes of
power
Class
PD max average power (W)
RCLS (Ω)
013
2 k
13.84
150
2
6.49
80.6
313
51.1
4
25.5
35.6
AM045038v1
PM8801



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