phyCORE-AM3517 Hardware Manual

Part II, Chapter 20: Power L-761e_2

The primary input power to the phyCORE-AM3517 Carrier Board is located at connector X9. The required load current capacity of the power supply depends on the specific configuration of the phyCORE-AM3517 mounted on the Carrier Board, and the interfaces enabled while executing software. An adapter with a minimum supply of 2000mA is recommended.

A detailed list of applicable configuration jumpers is presented below.

X22 Configures primary input power source. By default this jumper is set to 1+3/2+4, sourcing board power from the wall adapter input. Alternatively this jumper can be set to 3+5/4+6, sourcing board power from the Power over Ethernet circuit.

D26 Shows the status of the input power supply (wall power or PoE). When illuminated the supply is active.

20.2 Power over Ethernet (PoE)

The Power over Ethernet (PoE) circuit provides a method of powering the board via the Ethernet interface.

In this configuration the phyCORE-AM3517 Carrier Board acts as the Powered Device (PD) while the connecting Ethernet interface acts as the Power Source Equipment (PSE). For applications that require

Ethernet connectivity, this is an extremely convenient method for simultaneously providing power. To make use of the PoE circuit you must have a PSE for connectivity. Typically a PoE enabled router or switch can be used.

Table 20-1 provides a list of possible Power Sourcing Equipment you can purchase to interface

the phyCORE-AM3517 PoE circuit if you do not already have a PSE.

Table 20-1. Possible Ethernet PSE Options

Device Description

FS108P Netgear 8-port Ethernet switch with 4-port PoE support.

TPE-101I TRENDnet single port PoE injector

The IEEE PoE standard restricts the maximum amount of power a PSE must provide and therefore a PD can consume. The phyCORE-AM3517 Carrier Board PoE circuit was designed to provide up to 8.5W of power to the board. Note that this is less than the wall adapter can supply and less than the SOM, Carrier

Board, and additional circuits can potentially consume. The base configuration of the SOM and Carrier

Board typically consume less than 2 watts. Be aware that this PoE limitation could cause board operation to fail if peak power capability is exceeded due to added peripherals. The phyCORE-AM3517 Carrier

Board Ethernet connector X17 supports both PSE power sourcing methods of power over the data wires, or power over the spare wires.

A detailed list of applicable configuration jumpers and LED indicators is presented below.

JP33 Controls the PoE signature resistor internal to the Linear Tech LTC4267 PoE IC. By default this jumper is set to the 2+3 position, enabling the 25k signature resistor. Alternatively this jumper can be set to the 1+2 position, disabling the 25k signature resistor. For normal operation this jumper should be set to the 2+3 position, but in some applications it may be necessary to disable the signature resistor.

X22 Configures primary input power source. By default this jumper is set to 1+3/2+4, sourcing board power from the wall adapter input. Alternatively this jumper can be set to 3+5/4+6, sourcing board power from the Power over Ethernet circuit.

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