Texas Instruments TPS2375EVM, Руководство пользователя, Страница: 11 / 26

2-1 Hardware Overview
The HPA028 EVM features the TPS2375 made by Texas Instruments
Incorporated. The EVM is designed to look like the front end of any Power Over
Ethernet (PoE) Powered Device (PD) module. An RJ-45 connector is provided
to connect directly to an Ethernet cable having a Power Sourcing Equipment
(PSE) driving it on the other end. The EVM also accepts power applied using
a stand-alone power supply.
According to the IEEE 802.3af specification, the PD module must provide the
circuitry needed to be detected by the PSE as it polls the Ethernet links. The
IEEE 802.3af specification also allows the option for the PD to provide
classification as to the amount of power needed by the PD Module. The
HPA028 EVM with the TPS2375 provides all the necessary hardware to
provide detection and classification.
The HPA028 EVM also has connections for connecting an external DC/DC
converter to convert the 48 V down to the voltages needed for the Ethernet
Module.
Chapter 2