Hello SparkFun folks, I was curious what the power limitations are for the QWIIC connections from the Artemis Nano and the Artemis RedBoard?
For the cable and JST connectors itself, the very conservative max current is 226mA[[1][/size]. If you want to push it, 28AWG is good for up to 1.4A for chassis wiring “isolated, unbundled wire in free air, as per the Handbook of Electronic Tables and Formulas for American Wire Gauge.” We wouldn’t recommend pushing the cables to 1.4A, but hundreds of mA should be fine.
Now for both Artemis boards, the 3.3 volt regulator on those tops out at 600mA. I don’t have a accurate figure for how much current the boards themselves require, but lets assume 50mA, to be safe. (likely way more than reality.) That would give you 550mA free for your other peripherals over the Qwiic bus but keep in mind you might see a voltage drop if you exceed 226mA.](American Wire Gauge Chart and AWG Electrical Current Load Limits table with ampacities, wire sizes, skin depth frequencies and wire breaking strength)