It turns out that there’s a nice way to measure current consumption with a commercial board by ST Microelectronics. It’s called the 32L0538-DISCOVERY, but for brevity and consistency I’m going to call it the “Disco-L053” from now on:
This is one of a long range of “Discovery” evaluation boards by STM, and as you can see it even has a touch slider and 172x72 pixel ePaper display. But the main feature for our purposes is that it includes a very nice current measuring circuit, which is used by some demo software to demonstrate that the main L053 µC on the board draws 42 µA in low-power run mode at 131 KHz and that it has a “stop” mode which draws a mere 400 nA.
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