SI3461-KIT Silicon Laboratories Inc, SI3461-KIT Datasheet - Page 4

• Manufacturer Part Number: SI3461-KIT
• Description: BOARD EVAL FOR SI3461
• Manufacturer: Silicon Laboratories Inc
• Type: Controllers & Processorsr

Specifications of SI3461-KIT

• Main Purpose: Special Purpose DC/DC, Power Over Ethernet
• Board Type: Fully Populated
• Utilized Ic / Part: Si3461
• Ethernet Connection Type: 10/100 Base-T, IEEE 802.3
• Interface Type: Ethernet
• Operating Voltage: 12 V to 15 V
• Operating Current: 10 mA
• Product: Modules
• For Use With/related Products: Si3460
• Lead Free Status / RoHS Status: Lead free / RoHS non-compliant
• Current - Output: -
• Voltage - Output: -
• Voltage - Input: -
• Power - Output: -
• Frequency - Switching: -
• Outputs And Type: -
• Regulator Topology: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1843

Si3461-EVB
5. Introduction to PoE
IEEE 802.3 clause 33 is the standard for providing power to a remote Ethernet device on the same cable that is
carrying data. The draft standard for higher power situations, often referred to as POE+, is 802.3at. The power is
either carried common-mode on one of the data pairs (for 10/100/1000BASE-T) or on the spare pairs for
10/100BASE-T only applications. There are various different connection schemes depending on the pairs used to
carry the power (Alternative A or B), the location of power insertion (Endpoint or Midspan), and
10BASE-T/100BASE-TX or 1000BASE-T compatibility.
The Si3461-EVB implements the configuration shown in Figure 4. Midspan PSE connection (Alternative B), but the
Si3461 controller can be configured to operate in either Midspan or Endpoint applications and may be designed in
applications using any pairs.
*Note: This is the connection scheme implemented on the Si3461-EVB reference design.
4
Spare pair
Spare pair
Data pair
Data pair
SWITCH/HUB
4
5
1
2
3
6
7
8
Figure 4. Midspan PSE Connection (Alternative B)*
Ethernet IN
4
5
1
2
3
6
7
8
POWER SOURCING
EQUIPMENT (PSE)
48 V
±
±
Rev. 0.5
TX
RX
4
5
2
3
6
7
1
8
PoE
S PARE PAIR
S IGNAL P AIR
S IGNAL P AIR
SPARE PAIR
4
5
1
2
3
6
7
8
POWERED DEVICE
RX
TX
(PD)
Converter
DC- DC
PD I/F
and