发明名称 Interface circuit for providing high speed digital communication between a master universal asynchronous receiver transmitter (UART) device and a 1-wire, UART compatible sensor
摘要 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 includes a safety barrier circuit, a slave modulator/demodulator (modem) circuit, and a master modem circuit. The slave modem circuit selectively converts digital sensor data received from the UART compatible interface pin into current pulses and selectively supplies digital calibration data to the UART compatible interface pin. The master modem circuit is configured to convert the current pulses into a UART compatible signal for transmission to the master UART device and selectively supply the digital calibration data.
申请公布号 US9374255(B1) 申请公布日期 2016.06.21
申请号 US201514741019 申请日期 2015.06.16
申请人 Honeywell International Inc. 发明人 Malhan Vishal;Pradhan Mahendra Kumar
分类号 G06F3/00;H04L27/12;H04B3/54 主分类号 G06F3/00
代理机构 Conley Rose, P.C. 代理人 Conley Rose, P.C. ;Harkins Kristin Jordan
主权项 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.
地址 Morris Plains NJ US