The Cost of Digital Isolation (DC-DC Converter, SI8631, MAX6675 and Arduino)

We’re not talking bill of material, but current and power …
↓↓↓ Complete description, time index and links below ↓↓↓

So you need to galvanically isolate a part of you digital circuit. Of course you need to pay for the additional parts required, say a digital isolator and an isolated DC-DC converter. But that’s not all. You current requirements might skyrocket as well.

How much? Well it depends. In my case it was an order of magnitude. Also, the current consumed by a digital circuit can vary over time. That impacts your design in regards to the DC-DC converter, especially when using an unregulated one.

00:00 Intro – the costs, the previous three videos and the measurements ahead
01:55 Recap – of the circuit under test
03:17 Overview – of what I’ll be doing and a (mostly) wrong prediction
04:40 Datasheets – they don’t specify a minimum value for the supply current
06:34 Measuring – the supply currents of the MAX6675 and SI8631
10:59 Results – actually measured supply currents vs the datasheet values
14:13 1W DC-DC converter – definitely the wrong part for the job!
19:11 100mW DC-DC converter – the right part for the job?
22:34 Summary – smaller is much better, but only big things are really efficient
25:32 Wrap-up – digital isolation is expensive

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
Galvanic Isolation of SPI Devices (e.g. Arduino, MAX6675 and SI8631): https://youtu.be/6rEJh4yPekg

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

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