Abstract: In some embodiments, a powered device includes a powered device circuit, which may include a maintain power signature (MPS) circuit configured to compare a sense current to a reference current. In a first mode, the MPS circuit may be configured to automatically generate an MPS signal when the sense current is less than the reference current.

Abstract: In some embodiments, powered devices, circuits, and methods are disclosed that may include biasing a hot swap switch to couple a capacitor of a DC-DC converter to negative supply node when an input voltage exceeds a threshold and biasing a telephony switch to couple a positive supply node to a negative supply node when the input voltage exceeds the threshold. Further, the method may further include deactivating the hot swap switch after a period of time, and continuing to bias the telephony switch.

Abstract: In some embodiments, powered devices, circuits, and methods are disclosed that may include biasing a hot swap switch to couple a capacitor of a DC-DC converter to negative supply node when an input voltage exceeds a threshold and biasing a telephony switch to couple a positive supply node to a negative supply node when the input voltage exceeds the threshold. Further, the method may further include deactivating the hot swap switch after a period of time, and continuing to bias the telephony switch.

Abstract: In some embodiments, a powered device includes a powered device circuit, which may include a maintain power signature (MPS) circuit configured to compare a sense current to a reference current. In a first mode, the MPS circuit may be configured to automatically generate an MPS signal when the sense current is less than the reference current.

Abstract: A gate drive circuit includes a first gate terminal, a second gate terminal, and a driver circuit including an input and including an output coupled to the first gate terminal. The driver circuit is configured to provide a drive signal to the first gate terminal to control a first switch to selectively couple a first current path to a first wire pair of a network port. The gate drive circuit further includes a switch including a first terminal coupled to the output of the driver circuit, a second terminal coupled to the second gate terminal, and a control terminal responsive to a switch control signal to selectively couple the output of the driver circuit to the second gate terminal to control a second switch to selectively couple a second current path to a second wire pair of the network port.

Abstract: In a particular embodiment, a power sourcing equipment (PSE) device includes at least one network port adapted to couple to a powered device to provide power and optionally data to the powered device via a network cable. The PSE device further includes a current limiter circuit coupled to the at least one network port and having an adjustable threshold. The PSE device also includes a logic circuit coupled to the current limiter circuit and adapted to reduce the adjustable threshold of the current limiter circuit to have a threshold level that is below a nominal operating current level. After a period of time has elapsed during which the current limiter circuit is not activated, the logic circuit is adapted to determine that the powered device is disconnected from the at least one network port.

Abstract: A gate drive circuit includes a first gate terminal, a second gate terminal, and a driver circuit including an input and including an output coupled to the first gate terminal. The driver circuit is configured to provide a drive signal to the first gate terminal to control a first switch to selectively couple a first current path to a first wire pair of a network port. The gate drive circuit further includes a switch including a first terminal coupled to the output of the driver circuit, a second terminal coupled to the second gate terminal, and a control terminal responsive to a switch control signal to selectively couple the output of the driver circuit to the second gate terminal to control a second switch to selectively couple a second current path to a second wire pair of the network port.

Abstract: In an embodiment, a circuit device includes a first counter responsive to a clock signal and to a first control word having a first precision. The counter produces a first control signal related to the first control word at a first output. The circuit device further includes a second counter responsive to the clock signal and to a second control word having the first precision. The second counter produces a second control signal related to the second control word at a second output. The circuit device also includes a filtering circuit responsive to the first output and the second output to receive the first and second control words. The filtering circuit is adapted to produce an output control signal related to the first and second control words, where the output control signal has a second precision that is greater than the first precision.

Abstract: A powered device includes a first supply terminal, a second supply terminal, and at least one input pin coupled to the first supply terminal. The powered device further includes an external capacitor having a first terminal coupled to the first supply terminal, a switch coupled to the second supply terminal and coupled to a second terminal of the external capacitor, and power surge detection logic coupled to the switch. The external capacitor is charged in response to a detected power surge that exceeds a threshold.

Abstract: In an embodiment, a circuit device includes a first counter responsive to a clock signal and to a first control word having a first precision. The counter produces a first control signal related to the first control word at a first output. The circuit device farther includes a second counter responsive to the clock signal and to a second control word having the first precision. The second counter produces a second control signal related to the second control word at a second output. The circuit device also includes a filtering circuit responsive to the first output and the second output to receive the first and second control words. The filtering circuit is adapted to produce an output control signal related to the first and second control words, where the output control signal has a second precision that is greater than the first precision.

Abstract: In a particular embodiment, a power sourcing equipment (PSE) device includes at least one network port adapted to couple to a powered device to provide power and optionally data to the powered device via a network cable. The PSE device further includes a current limiter circuit coupled to the at least one network port and having an adjustable threshold. The PSE device also includes a logic circuit coupled to the current limiter circuit and adapted to reduce the adjustable threshold of the current limiter circuit to have a threshold level that is below a nominal operating current level. After a period of time has elapsed during which the current limiter circuit is not activated, the logic circuit is adapted to determine that the powered device is disconnected from the at least one network port.

Abstract: A powered device includes a first supply terminal, a second supply terminal, and at least one input pin coupled to the first supply terminal. The powered device further includes an external capacitor having a first terminal coupled to the first supply terminal, a switch coupled to the second supply terminal and coupled to a second terminal of the external capacitor, and power surge detection logic coupled to the switch. The external capacitor is charged in response to a detected power surge that exceeds a threshold.