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PM8805 数据表(PDF) 21 Page - STMicroelectronics

部件名 PM8805
功能描述  IEEE 802.3bt PoE-PD interface with embedded dual active bridge
PDF  45 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

PM8805 数据表(HTML) 21 Page - STMicroelectronics

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DS12813 Rev 1
21/45
PM8805
PM8805 overview
45
Note 1. T2 output indicates the number of used bridges. If the value is 1, only one bridge is
used (2-pair), if the value is zero, both the bridges are used (4-pairs).
The Classification phase is valid only for PoE devices, so it is not required when connected
to any non-PoE power source such as a wall adapter; in that cases the CLS buffers are
never turned on. See Section 4.10 for more details on auxiliary sources. The CLS buffers
are turned off in case a thermal protection occurs.
Table 7. Classification table
PSE
PD class
(Requested)
CLS1
resistor
(
Ω)
CLS2
resistor
(
Ω)
Class
events
PD
allocated
power (W)
PD
class
(Assigned)
T0
output
T1
output
T2
output
(Note 1)
Type 1
(1-event)
0
2K
--
1
12.95
0
1
1
1
1
150
--
1
3.84
1
1
1
1
2
80.6
--
1
6.49
2
1
1
1
3
51.1
--
1
12.95
3
1
1
1
Type 2
(2-events)
4
36.5
--
2
25.5
40
1
1
--
1
12.95
3
1
1
1
Type 3 or 4
(5-events)
1st event has
a Long Pulse
1
150
--
1
3.84
1
1
1
0 or 1
2
80.6
--
1
6.49
1
1
1
0 or 1
3
51.1
--
1
12.95
1
1
1
0 or 1
4
36.5
--
2, 3
25.5
4
0
1
0 or 1
1
12.95
3
1
1
0 or 1
52K
440
51
0
0
2, 3
25.5
4
0
1
0 or 1
1
12.95
3
1
1
0 or 1
6
150
451
61
0
0
2, 3
25.5
4
0
1
0 or 1
1
12.95
3
1
1
0 or 1
7
80.6
562
70
0
0
451
6
10
0
2, 3
25.5
4
0
1
0 or 1
1
12.95
3
1
1
0 or 1
8
51.1
5
71.3
80
0
0
451
6
10
0
2, 3
25.5
4
0
1
0 or 1
1
12.95
3
1
1
0 or 1



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