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LT4295 Datasheet(PDF) 19 Page - Analog Devices

Part # LT4295
Description  12-/24-/48-Port IEEE 802.3 at PoE PSE Controller
PDF  34 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LT4295 Datasheet(HTML) 19 Page - Analog Devices

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Data Sheet
LTC9101-2A/LTC9102
APPLICATIONS INFORMATION
analog.com
Rev. 0 | 19 of 34
PDs are required to have a 25k common-mode resistance at their
input. When such a PD is connected to the cable, the PSE detects
this signature resistance and applies power. When the PD is later
disconnected, the PSE senses the open circuit and removes power.
The PSE also removes power in the event of a current fault or short
circuit.
When a PD is detected, the PSE looks for a classification signature
that tells the PSE the maximum power the PD draws. The PSE
can use this information to allocate power among several ports, to
police the power consumption of the PD, or to reject a PD that
draws more power than the PSE has available.
Table 6. 802.3at-Specified Power Allocations
PD
CLASS
PSE OUTPUT
POWER
ALLOCATED CABLING
LOSS
PD INPUT POWER
1
4W
0.16W
3.84W
2
7W
0.51W
6.49W
0, 3
15.4W
1.4W
13W
4
30W
4.5W
25.5W
Figure 35. 2-Pair Power over Ethernet System Diagram, Endpoint PSE
Table 7. Device Configuration Options
CFG [1:0]
NUMBER OF
PORTS
NUMBER OF
9101s
NUMBER OF
9102s
I2C
ADDRESSES
I2C ADDRESS OFFSET
0
1
2
3
4
5
6
7
8
9
10
11
0 00
12
1
1
3
✓
✓
✓
1 01
24
1
2
6
✓
✓
✓
✓
✓
✓
2 10
36
1
3
9
✓
✓
✓
✓
✓
✓
✓
✓
✓
3 11
48
1
4
12
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓



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