![]() 1).įigure 1 : Voltage droping (cable ressistance was assumed to 0.5 Ohm)ĭepending on your SBC, it’s more or less tolerant to such a voltage drop. It’s clear that the more current is needed, the more drops the voltage (fig. For the moment, let’s assume our power source delivers a stable Voltage (what isn’t true, depends on current needed) and our cable has fixed resistance (what’s more or less correct). The micro USB cable which powers our board acts as resistor between the output of the power source and the input of our board. ![]() So the only variable that we can influence is the resistance (R)! 1), your SBC needs a defined voltage (U) and current (I). Since there are a lot of issiues with underpowered boards, this ‘White Paper’ should explain why it’s recommendet to think about the powering situation of your board (especially if it’s powered throught micro USB).
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