The TPS23882B is an 8-channel, IEEE 802.3bt ready PoE PSE controller and can be used in high port count semiauto or fully micro-controller managed applications (TI recommends the MSP430FR5969 micro-controller for most applications). Subsequent sections describe detailed design procedures for applications with different requirements including host control.

The schematic of Figure 10-1 depicts semiauto mode operation of the TPS23882B, providing functionality to power PoE loads. The TPS23882B can do the following:

1. Performs load detection
2. Performs classification including the 100-ms long finger for Autoclass discovery and 80.23bt reduce T_MPS support
3. Enables power on with protective foldback current limiting, and port power policing (P_CUT) value
4. Shuts down in the event of fault loads and shorts
5. Performs Maintain Power Signature function to insure removal of power if load is disconnected
6. Undervoltage lockout occurs if VPWR falls below V_{PUV_F} (typical 26.5 V)

Following a power-off command, disconnect or shutdown due to a Start, P_CUT or I_LIM fault, the port powers down. Following port power off due to a disconnect, the TPS23882B immediates restart the detection and classification cycles if the DETE and CLE bits are set in register 0x14. If the shutdown is due to a start, P_CUT or I_LIM fault, the TPS23882B enters into a cool-down period during which any Detect/Class Enable Command for that port is delayed. At the end of cool down cycle, one or more detection/class cycles are automatically restarted if the class and/or detect enable bits are set. If a port is disabled using the power off command, the DETE and CLE bits are cleared and these bits must be reset over I²C for detection and classification to resume.