Bus interface for a two-wire bus with adjustable pull-up/pull-down resistance values
AssigneeWAGO Verwaltungsgesellschaft mbH
InventorsTorsten Klinkow, Matthias Kahde, Thorsten Lindner
Life of this patent
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Abstract
Bus interface for a two-wire bus with adjustable pull-up/pull-down resistance values. A device has a bus interface for a two-wire bus comprising a first terminal and a second terminal for connection to the two-wire bus, a pull-up resistor device connected to the first terminal for a first conductor of the two-wire bus, and a pull-down resistor device connected to the second terminal for a second conductor of the two-wire bus. The pull-up resistor device is arranged to set a pull-up resistance value based on a pull-up control signal. The pull-down resistor device is arranged to set a pull-down resistance value based on a pull-down control signal.
Claims13
A device comprising:
- a bus interface for a two-wire bus comprising a first terminal and a second terminal for connection to the two-wire bus;
- a pull-up resistor device connected to the first terminal for a first conductor of the two-wire bus;
- and
- a pull-down resistor device connected to the second terminal for a second conductor of the two-wire bus,
- wherein the pull-up resistor device is arranged to set a pull-up resistance value based on a pull-up control signal,
- wherein the pull-down resistor device is arranged to set a pull-down resistance value based on a pull-down control signal, and
- wherein, with respect to the pull-up resistor device and the pull-down resistor device, the first terminal is connected solely to the pull-up resistor device and the second terminal is connected solely to the pull-down resistor device.
A device comprising:
- a bus interface for a two-wire bus comprising a first terminal and a second terminal for connection to the two-wire bus;
- a pull-up resistor device connected to the first terminal for a first conductor of the two-wire bus;
- and
- a pull-down resistor device connected to the second terminal for a second conductor of the two-wire bus;
- and
- a transceiver for communication, which is connected to the first terminal and the second terminal and derives symbols representing bus communication data from an electrical voltage between the first terminal and the second terminal,
- wherein the pull-up resistor device is arranged to set a pull-up resistance value based on a pull-up control signal, and
- wherein the pull-down resistor device is arranged to set a pull-down resistance value based on a pull-down control signal.
A method comprising:
- providing a bus interface, wherein the bus interface comprises a first input and a second input and is arranged to monitor an electrical voltage between the first input and the second input and to derive data from values of the monitored voltage;
- and
- activating, as a part of a configuration routine, a first current path, which extends from the first input via a first pull-up resistor, by the bus interface and/or activating, as a part of the configuration routine, a second current path, which extends from the second input via a first pull-down resistor, by the bus interface,
- wherein the first current path and the second current path remain activated during a control operation of the bus interface subsequent to the configuration routine.
Dependencies are inferred from the claim text.