SLUSBX9I March 2014 – July 2019 TPS23861
The results of the detection cycle and classification cycle are each stored in a 4-bit field for each port in the Detect Pn and Class Pn fields of the Port n Status Register. The results of a detection and classification event are encoded as follows.
|DETECT Pn||DETECT STATUS|
|0000||Unknown (POR value)|
|0001||Short circuit (<500 Ω)|
|0011||Resistance too low|
|0101||Resistance too high|
|1010||Capacitance measurement invalid: Detect measurement beyond clamp voltage|
|1011||Capacitance measurement invalid: Insufficient Δv measured|
|1100||Capacitance measurement is valid, but outside the range of a legacy device.|
|CLASS Pn||CLASSIFICATION STATUS|
|0101||Reserved – read as class 0|
A class mismatch can occur only during two-event classification. If the classification statuses for the first and second event are different, and the second classification status is not “Overcurrent”, the Classification Status will be set to Class Mismatch. If the status of the first classification event is “Overcurrent”, the classification status is set to “Overcurrent” in the Class Pn field, and there will be no second classification event in any case. If in Auto Mode, the port will not power on automatically, but it still can be powered on through the Power Enable Register.