JAJSES8B October 2017 – November 2018 TPS2372
The TPS2372 has a number of internal comparators with hysteresis for stable switching between the various states. Figure 16 relates the parameters in Electrical Characteristics to the PoE states. The mode labeled Idle between Classification and Operation implies that the DEN, CLSA, CLSB, and RTN pins are all high impedance. The state labeled Mark, which is drawn in dashed lines, is part of the Type 2-3-4 hardware class state machine.