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USB ISOLATOR THERMOCOUPLES PDF
USB ISOLATOR THERMOCOUPLES SERIAL
USB ISOLATOR THERMOCOUPLES DRIVERS

Using a digital isolator for USB, such as ADuM3160, achieves this in a wide body SOIC footprint.

USB ISOLATOR THERMOCOUPLES DRIVERS

This is particularly advantageous for isolating RS-232 or RS-485 interfaces where an IC is already required to transmit and receive at the appropriate voltages.įor USB, two signals, D+ and D−, need to be isolated transparently or have custom software drivers in order to not interfere with the USB handshaking protocol. Other IC functionality, such as transceivers, can be integrated into single chip solutions requiring a little extra PCB area compared to non-isolated solutions. Isolating Using iCoupler Digital Isolatorsĭigital isolators using iCoupler technology offer high levels of robustness for galvanic isolation with enhanced reliability and lower power requirements than optocouplers. In theory, both can be isolated in order to protect the interface module itself from either equipment, or to provide safety isolation from two basic isolation interfaces in series. In a USB to UART interface, there are two possibilities: either the USB interface can be isolated or the UART interfaces (RS-232, RS-485, and RS-422) can be isolated.

Some basic diagnostic equipment, such as a laptop, may not have the same rigorous levels of interface protection as industrial equipment.

Hazardous voltages can occur on fieldbus networks due to switching noise from motors and relays.

If the debug equipment is not grounded, static can discharge into the units under test.

If the debug equipment is grounded, differences in ground potentials can result in loop currents.

When connecting debug consoles, such as laptop computers, several hazards are apparent, as shown in Figure 1. Galvanic isolation prevents any flow of current while allowing data transfer, protecting both the unit under test and the debug unit. When interfacing with industrial equipment, it is of paramount importance to avoid interfering with the operation of those systems. Combinations of interface iCoupler ® and isoPower ® isolation technology from Analog Devices, integrated together in a variety of ICs, allow easy solutions for bridging the gap between USB and traditional industrial interfaces. In addition to the hardware interfaces required for any USB to UART translation, galvanic isolation is a functional and potential safety requirement for any interface circuit between test or monitoring equipment, as well as industrial equipment that is potentially in active use in an electrically harsh environment.

USB ISOLATOR THERMOCOUPLES SERIAL

As a result, there can be a mismatch between the available interfaces on tools used for debugging or monitoring, such as laptop computers that only have USB for serial communications, and industrial equipment that may only expose RS-232, RS-422, or RS-485 interfaces. In order to add robustness through differential communication, RS-422 or RS-485 are also widely used, and RS-485 remains the physical layer standard used by various wired multinode industrial network or fieldbus protocols. However, industrial devices still rely, in many cases, on the older standard of RS-232 for debug or master slave connections.

USB ISOLATOR THERMOCOUPLES PDF

Conal Watterson Download PDF IntroductionĪs a standard for serial communication to peripheral devices, USB is ubiquitous today. Integrated iCoupler Digital Isolation With isoPower Bridges the Gap Between USB and Traditional Industrial Interfacesĭr.