![]() ![]() ![]() You should connect the isolated ground to the ground on the remote system to control the common mode range. There are also RS-485 hybrid transceiver modules with the DC-DC converter built-in, but they're a bit expensive, and the DC-DC converter is probably a bit inefficient compared to one with a less constrained transformer. I see 176 pages (25 per page) of different isolated DC-DC board-mount modules before filtering for required power and for input and output voltages.Įdit: One of my favorites is the TI (nee Burr-Brown) DCR01 series, which has an LDO (no problems out-of-spec voltages with light loads) and fits in an SOP that is 2.5mm high. Isolated DC-DC converters are very common, just do a parametric search at some distributor such as Digikey. TEXAS INSTRUMENTS ISO7221CD IC: interface digital isolator 25Mbps 35.5VDC Profibus SMD - This product is available in Transfer Multisort Elektronik. A high CM range transceiver would still require some kind of control of the common mode voltage. Several volts of difference is okay (-7 to +12) so any reasonable connection over a short distance should meet this requirement. Then the CM range is controlled and you're back to the original situation. You can connect the two grounds if they're truly floating wrt each other. If this is bad way to do it, is there any other approach to isolate bidirectional data lines? Is this correct? If so, how would one choose the values for these resistors? My understanding of the cicuit is, that the 4k7 Resisors dampen the feedback signal and therefor the feedback should not be visible if the line is not driven at the outher side of the isolator. Here is a scope image of the Data line after the isolation IC: Obviously this is due to the chain of the two isolator channels that feed back into the signal with a delay. The bidirectional Data signal however is severely degraded. The unidirectional CLK signal arrives in quite a good condition after the isolator. Texas Instruments ISO776x/ISO776x-Q1 High-Speed, Robust EMC Six-Channel Digital Isolators are high performance with 5000V RMS in the DW package offering. Mouser offers inventory, pricing, & datasheets for SMD/SMT 4. Transformers pulse current through a coil, as shown in Figure 1, to create a small, localized magnetic field that induces current in another coil. SMD/SMT 4 Channel SOIC-16 Unidirectional Digital Isolators are available at Mouser Electronics. I have implemented the design on a prototype pcb. Digital isolators use transformers or capacitors to magnetically or capacitively couple data across an isolation barrier, compared to optocouplers that use light from LEDs. It uses an SI8662 6-ch, digital Isolation IC. I have found a circuit that claims to be able to do this for a generic ARM Cortex. Specifically I would like to isolate the 2-wire debug interface of an STM32 and the STlinkV2. I am now faced with isolating a bidirectional digital signal line. Digital public infrastructure (DPI) can transform the agriculture. I have used digital Isolators before in unidirectional Designs.
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