Texas Instruments TIDA-050026-23881, Design Manual, Page: 14 / 24

Hardware, Software, Testing Requirement and Test Result
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14 SLVUBN3A – May 2019 – Revised October 2019
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24-Port (4 Pair) Power Sourcing Equipment Reference Design for Multi-port
Applications
• OSS signal source (from MCU or CPLD):In a multi-power supply system, when one power supply has
faults and the remaining power supply is not able to supply the current power consumption, turn off low
priority ports to protect the remaining power supply. The OSS function of the PSE is used to fast
shutdown the low priority ports. There are 2 sources to generate the OSS signal:
1. MSP430 generates the OSS signal
2. CPLD generates the OSS signal
• Interrupt mask
The interrupt mask in Figure 5 can be configured to enable interrupt events to notify the host through
the MSP430 P6.0.
Figure 5. GUI System Configuration and PPM Configuration
PPM configuration is applied to the port power management mechanism. The following parameters can be
configured through the PPM configuration tab:
• Power limit mode: class limit mode and port limit mode
– Class limit mode: in class limit mode, the port power is limited by the class level of the PD. For
example, if the PD is class 8, the port power limit (PCUT) is set to 90 W.
– Port limit mode: in port limit mode, the port power is limited by the host. The host should set port
power limit before the port is powered on.
• Power policy:static and dynamic mode
– Static mode: in static mode, the port power allocation is set to port power limit. So in class limit
mode, port power allocation is class level power of the PD and in port limit mode, the port power
allocation is the port power limit configured from the host.
– Dynamic mode: in dynamic mode, the port power allocation equals to the actual consumed power
of the port. It allocates the unused power of the port to other ports.