SLVSF02E march 2019 – may 2023 TPS23881
PRODUCTION DATA
The TPS23881 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 TPS23881, providing functionality to power PoE loads. The TPS23881 can do the following:
Following a power-off command, disconnect or shutdown due to a Start, PCUT or ILIM fault, the port powers down. Following port power off due to a disconnect, the TPS23881 immediately restarts the detection and classification cycles if the DETE and CLE bits are set in register 0x14. If the shutdown is due to a start, PCUT or ILIM fault, the TPS23881 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, detect, or both 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.