Hardware, Software, Testing Requirement and Test Result
13
SLVUBN3A – May 2019 – Revised October 2019
Copyright © 2019, Texas Instruments Incorporated
24-Port (4 Pair) Power Sourcing Equipment Reference Design for Multi-port
Applications
Select the MSP430 device you want to start with and then load the PSE system firmware code image
(request from the
or the
). Once finished,
click
Proceed
to go to the configuration page.
Figure 4. GUI Device Selection and Image Load
The configurations are split into 4 sections: system configuration, PPM (Port Power Management)
configuration, device configuration, and port configuration.
The system configuration is applied to the whole system. This tab is always available on the right side of
the GUI. The following parameters can be configured through the system configuration tab:
•
Legacy detection functions
Legacy devices released prior to the PoE standard can be powered through the Ethernet cable. The
PSE system firmware detects these legacy PDs and powers on with protection.
•
Use of external sensing circuit
The external sensing circuit is used to measure the total power consumption of the system. Once the
current exceeds the power budget, the MCU shuts down low priority ports. This increases the system
response to the load step change.
•
System boot-up setting
1. Turn on the PSE port as soon as the power is up.
2. Turn on the PSE port after the PoE enable command is sent from the host
•
Port overload retry mode
1. Re-enable immediately: after overload happens, the port is re-enabled immediately. If the overload
still presents, it will try at most 5 times and shuts down the port if the overload is not removed within
5 retries. The port is re-enabled after the PD is removed from the port and reconnects to the port.
2. Re-enable after PD is disconnected and connected: after overload happens, the port is disabled
immediately and is re-enabled after the PD is removed from the port and reconnects to the port.
3. Timer controlled: the port is re-enabled immediately after overload happens. The port keeps
retrying for a period (controller by timer) and is disabled after the timer expires. The port is re-
enabled after the PD is removed from the port and reconnects to the port.