Galvanic Isolation of SPI Devices (e.g. Arduino, MAX6675 and SI8631)

Galvanic isolation is not just for power, it’s for data too …
↓↓↓ Complete description, time index and links below ↓↓↓

You’ve got some devices on a SPI bus? They’re connected to different voltage potentials? They’re sensors that don’t like potential differences? They’re even handling mains or other high voltages? You should be worried!

Fortunately I’ve got a solution for you: Digital isolators and isolated DC-DC converters! Forget about those optocouplers! I’m talking speed here: 1 Mhz and upwards! So don’t wait any longer! Get your SPI bus galvanic isolation now!

00:00 Intro – the problem with non-insolated thermocouples
02:24 Challenge – isolate the SPI bus lines and provide isolated power
04:00 Digital isolation – one chip does it all for the SPI bus lines CUT???
10:32 Circuit 1 – schematic and breadboard build with digital isolator
16:30 Power isolation – an isolated, unregulated DC-DC converter does it
22:24 Wrap-Up – isolation for all kinds of SPI (or I²C etc.) devices

Tutorials: https://www.youtube.com/playlist?list=PLwq-2MnM58FKn3920rc1V0qoTsQDheTIw
Arduino, Thermocouples, MAX6675 and SPI – The Fine Points: https://youtu.be/qub3yzqEwek
Isolated, Unregulated DC-DC Converters – The Pitfalls: https://youtu.be/hVjs5LGEvLY
Maxim Application Note 5134 “Implementing an Isolated 1-Wire Bus” https://www.maximintegrated.com/en/app-notes/index.mvp/id/5134
Maxim Application Note 3754 “Single-Wire Serial Bus Carries Isolated Power and Data” https://www.maximintegrated.com/en/app-notes/index.mvp/id/3754

#robertssmorgasbord #tutorials #tutorial #how-to # #SPI #bus #isolation #galvanic

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