Multiplexed RF isolator circuit
First Claim
1. An integrated circuit isolator for providing data transfer of digital data signals across a voltage isolation barrier, comprising:
- an integrated circuit package having a first plurality of input data pins on one side of the isolation barrier and a corresponding plurality of output data pins on the other side of the isolation boundary;
first circuitry associated with the first plurality of input data pins and second circuitry associated with the plurality of output data pins;
a communications interface for providing across the voltage isolation barrier a first communications channel for communicating data from the first circuitry to the second circuitry and a second communications channel for communicating synchronization clock data from the first circuitry to the second circuitry, wherein the communications interface comprises a first transformer for providing the first communications channel and a second transformer for providing the second communications channel and the first circuitry having communications circuitry associated therewith for transmitting data to the first transformer and to the second transformer and the second circuitry having communications circuitry for receiving data from the first transformer and the second transformer; and
the first circuitry operable to communicate information from input digital data overlapping each other in time and received on two or more of the associated first plurality of input data pins across the first communications channel and to communicate the synchronization clock signal across the second communications channel and the second circuitry operable to receive the communicated data from the first circuitry and reconstruct the data for output on the ones of the plurality of output data pins corresponding to the two or more of the associated plurality of input data pins from which the data was communicated responsive to the synchronization clock signal.
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Accused Products
Abstract
An integrated circuit isolator for providing data transfer of digital data signals across a voltage isolation barrier includes an integrated circuit package having a first plurality of input data pins on one side of the isolation barrier and a corresponding plurality of output data pins on the other side of the isolation boundary. First circuitry is associated with the first plurality of input data pins and second circuitry is associated with the plurality of output data pins. A communications interface provides across the voltage isolation barrier a first communications channel for communicating data from the first circuitry to the second circuitry and a second communications channel for communicating synchronization clock data from the first circuitry to the second circuitry. The first circuitry is operable to communicate information from input digital data overlapping each other in time and received on two or more of the associated first plurality of input data pins across the first communications channel and to communicate the synchronization clock signal across the second communications channel. The second circuitry is operable to receive the communicated data from the first circuitry and reconstruct the data for output on the ones of the plurality of output data pins corresponding to the two or more of the associated plurality of input data pins from which the data was communicated responsive to the synchronization clock signal.
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Citations
32 Claims
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1. An integrated circuit isolator for providing data transfer of digital data signals across a voltage isolation barrier, comprising:
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an integrated circuit package having a first plurality of input data pins on one side of the isolation barrier and a corresponding plurality of output data pins on the other side of the isolation boundary; first circuitry associated with the first plurality of input data pins and second circuitry associated with the plurality of output data pins; a communications interface for providing across the voltage isolation barrier a first communications channel for communicating data from the first circuitry to the second circuitry and a second communications channel for communicating synchronization clock data from the first circuitry to the second circuitry, wherein the communications interface comprises a first transformer for providing the first communications channel and a second transformer for providing the second communications channel and the first circuitry having communications circuitry associated therewith for transmitting data to the first transformer and to the second transformer and the second circuitry having communications circuitry for receiving data from the first transformer and the second transformer; and the first circuitry operable to communicate information from input digital data overlapping each other in time and received on two or more of the associated first plurality of input data pins across the first communications channel and to communicate the synchronization clock signal across the second communications channel and the second circuitry operable to receive the communicated data from the first circuitry and reconstruct the data for output on the ones of the plurality of output data pins corresponding to the two or more of the associated plurality of input data pins from which the data was communicated responsive to the synchronization clock signal. - View Dependent Claims (2, 3, 4, 5)
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6. An integrated circuit isolator providing for communications of multiple digital data signals over a pair of common communications channels across a voltage isolation barrier, comprising:
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an integrated circuit package having a plurality of input pins for receiving respective ones of a plurality of digital data signals on one side of the isolation barrier and a plurality of output pins for outputting a plurality of respective output digital data signals on the other side of the isolation barrier; first circuitry disposed within the package and on the one side of the isolation barrier and including; a serializer for receiving the plurality of digital data signals and outputting a serial data stream; a multiplexer for multiplexing a staff bit onto a beginning of the serial data stream on a first common communications channel and for placing a synchronization clock signal onto a second common communications channel; second circuitry disposed within the package and on the other side of the isolation barrier and including; a demultiplexer for removing the staff bit from the beginning of the serial data stream and separately outputting the serial data stream and the synchronization clock signal; a deserializer for receiving the serial data stream and outputting the plurality of digital data signals in parallel; and a communications interface for providing the first common communications channel and the second common communications channel, such that voltage isolation is maintained between the first an the second circuitry within the package. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An integrated circuit isolator providing for communications of multiple digital data signals over a pair of common communications channels across a voltage isolation barrier, comprising:
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an integrated circuit package having a plurality of input pins for receiving respective ones of a plurality of digital data signals on one side of the isolation barrier and a plurality of output pins for outputting a plurality of respective output digital data signals on the other side of the isolation barrier; first circuitry disposed within the package and on the one side of the isolation barrier and including; a serializer for receiving the plurality of digital data signals and outputting a serial data stream; a multiplexer for multiplexing a start bit onto a beginning of the serial data stream on a first common communications channel and for placing a synchronization clock signal onto a second common communications channel; a sync generator for generating the synchronization clock signal and for generating the start data bit responsive to a first control signal to indicate a beginning of a data frame; a first state machine for generating the first control signal; second circuitry disposed within the package and on the other side of the isolation barrier and including; a demultiplexer for removing the start bit from the beginning of the serial data stream and separately outputting the serial data stream and the synchronization clock signal; a deserializer for receiving the serial data stream and outputting the plurality of digital data signals in parallel; a sync detector connected to the first common communications channel and the second common communications channel, the sync detector detecting the start bit indicating a beginning of the serial data stream and generating a detect start frame signal responsive thereto; a second state machine for providing a third control signal to the demultiplexer responsive to detection of the detect start frame signal a communications interface for providing the first common communications channel and the second common communications channel, such that voltage isolation is maintained between the first an the second circuitry within the package. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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23. A method for providing communications of multiple digital data signals over a pair of common communications channels across a voltage isolation barrier, comprising the steps of:
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receiving on one side of the voltage isolation barrier a plurality of digital data signals on respective ones of a plurality of input pins of an integrated circuit package; converting the received plurality of digital data signals into a serial data stream; multiplexing a start bit onto a beginning of the serial data stream; transmitting the serial data stream with the start bit on a first common communications channel across the voltage isolation barrier; transmitting a synchronization clock signal onto a second common communications channel across the voltage isolation barrier; receiving the serial data stream with the start bit on the first common communications channel on the other side of the voltage isolation barrier; receiving the synchronization clock signal on the second common communications channel on the other side of the voltage isolation barrier; removing the start bit from the beginning of the serial data stream; converting the serial data stream into the plurality of digital data signals responsive to the synchronization clock signal; outputting on an other side of the voltage isolation barrier the plurality of digital data signals on respective ones of a plurality of output pins of the integrated circuit package. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31)
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32. The method of step of generating a clear signal responsive to detection of the start bit on the first common communications channel.
Specification