Other Parts Discussed in Thread: TPS2388, MSP430F5234
Dear TI team:
I got information from community that TPS23881 can support Perpetual POE and Fast PoE,
Based on my design, there are some questions need your help.
1. I have a reset signal from host controller to POE MCU, I think this reset signal may impact MCU & PSE controller Perpetual POE feature.
Because host controller may bootup slowly or has abnormal status,then release a reset signal to POE MCU which will interrupt the POE PSE Power,
I donot know my this thinking is reasonable or not, if this is reasonable, how to avoid this interruption?
Can it be fixed by SW or need other HW circuit?
2. For Fast POE, Community previous replys that "For Fast PoE, as long as the state/setting on each port is saved in memory. At restart, the PSE system can be turned ON to the same setting it was set to before the power loss."
What is the "memory" meaning? Does that mean we need add one more E2PROM for POE?
BR
Lisa
Community previous replys about Perpetual POE and Fast PoE:
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The TPS2388 can support Perpetual PoE (sometimes called Persistent PoE) and Fast PoE at a system design level.
For Perpetual PoE, if the switch is being updated from the host controller side, the MCU and PSE controller can continue to power and control each port based on the setting before the host controller is updated.
If the switch is being updated on the MCU side, it is not required but it is recommended to do a power on reset of the PSE controller.
For Fast PoE, as long as the state/setting on each port is saved in memory. At restart, the PSE system can be turned ON to the same setting it was set to before the power loss.
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