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Interface circuit for providing high speed digital communication between a master universal asynchronous receiver transmitter (UART) device and a 1-wire, UART compatible sensor

  • US 9,374,255 B1
  • Filed: 06/16/2015
  • Issued: 06/21/2016
  • Est. Priority Date: 06/16/2015
  • Status: Active Grant
First Claim
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1. A circuit for providing high speed digital communication between a master universal asynchronous receiver transmitter (UART) device and a 4-20 milliamp (mA) current loop sensor that has a 1-wire, UART compatible interface pin, comprising:

  • a safety barrier circuit coupled to receive and transmit voltage and current and to limit the voltage and current to less than predetermined entity parameters;

    a slave modulator/demodulator (modem) circuit coupled to the safety barrier circuit and adapted to couple to the current loop sensor, the slave modem circuit configured to (i) selectively convert digital sensor data received from the UART compatible interface pin into current pulses and supply the current pulses to the safety barrier circuit and (ii) selectively supply digital calibration data received from the safety barrier circuit to the UART compatible interface pin;

    a master modem circuit coupled to the safety barrier circuit and adapted to couple to the master UART device, the master modem circuit configured to (i) convert the current pulses selectively supplied to the safety barrier circuit into a UART compatible signal for transmission to the master UART device and (ii) selectively supply the digital calibration data to the safety barrier circuit.

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