Powered device including a multi-use detection resistor
First Claim
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1. An integrated circuit for use in a Power Over Ethernet (POE) powered device, the integrated circuit comprising:
- a first conductive terminal configurable to couple to a first terminal of an external resistor;
a second conductive terminal configurable to couple to a second terminal of an external resistor; and
a controller configured to selectively couple the second conductive terminal to a power supply terminal to provide a powered device detection signature in response to a powered device detection signal, the controller to selectively couple the second conductive terminal to the power supply terminal through a current source to produce a powered device classification mark signature in response to a classification mark signal.
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Abstract
In a particular embodiment, a method includes receiving a powered device (PD) detection signal at a PD from a powered network and applying the PD detection signal to an external resistor to provide a detection signature to the powered network. Further, the method includes receiving a PD classification mark signal at the PD, applying the received PD classification mark signal to the external resistor, and selectively activating a classification mark current path in parallel with the external resistor to produce a classification mark signature.
25 Citations
20 Claims
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1. An integrated circuit for use in a Power Over Ethernet (POE) powered device, the integrated circuit comprising:
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a first conductive terminal configurable to couple to a first terminal of an external resistor; a second conductive terminal configurable to couple to a second terminal of an external resistor; and a controller configured to selectively couple the second conductive terminal to a power supply terminal to provide a powered device detection signature in response to a powered device detection signal, the controller to selectively couple the second conductive terminal to the power supply terminal through a current source to produce a powered device classification mark signature in response to a classification mark signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An integrated circuit comprising:
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a positive supply pin configurable to couple to a first terminal of an external circuit component; a multi-use pin configurable to couple to a second terminal of the external circuit component; and control circuitry configurable to selectively couple the multi-use pin to a selected one of a plurality of current paths, the control circuitry to couple a first path of the plurality of current paths to the multi-use pin to provide a powered device detection signature and to couple a second path of the plurality of current paths to the multi-use pin to provide a powered device classification signal. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. An apparatus comprising:
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a first pin configurable to couple to a first terminal of an external circuit component; a multi-use pin configurable to couple to a second terminal of an external circuit component; a first current flow path having a first terminal coupled to a supply terminal and having a second terminal; a second current flow path having a first terminal coupled the supply terminal and having a second terminal; and control circuitry configured to selectively couple the second terminal of one of the first current flow path and the second current flow path to the multi-use pin in response to a signal on the first pin. - View Dependent Claims (18, 19, 20)
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Specification