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I used the clamp meter in peak mode to get an estimate of the inrush current since I don’t have an appropriate shunt resistor here.
Peak current observed was 2.2A (with a 13.5V supply and a current limit on the power supply of 5A).
This seemed like it was high than Liam’s specs, so I tested with the oscilloscope, using the power supply cable as the shunt resistor (measuring the voltage at both ends of it). The cable has a voltage drop of 28mV on a 2A current draw, and the peak current measured was about 8A. Note that this only lasted about 3uS. I am not confident in the oscilloscope measurements since we are dealing with inrush currents and thus EMC - and my test setup included long leads for the oscilloscope cables which increases the error. I propose that we find a better way to measure inrush current - we need a board or adapter that we can attach to any power supply (or ultra-fit/micro-fit connector) and oscilloscope to measure the inrush current easily, without much setup.
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Now to reconnect the isoSPI ICs and test them.
The 5V converter seems to be turning ON by default… Turns out that in the code I’m using the default state for initialized pins is high, so no issue here.
My firmware knowledge if very limited at the moment, so I will wait until I learn to generate a clock pulse or just jump straight to the AFE validation and hope it works.