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Messages - dtekumse

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Hello TinyWorld  :)

Could somebody, please, explain me how LEDs in USB TinyShield (used for TX and RX indication, designated as D1 and D2 in the schematic) were chosen?

Namely, those are amber - which means that the voltage should be around 2 V. The resistor is of 1 kOhm and the supply voltage is 3.3 V. Now, the current through the LED in this case is:

I = (3.3 - 2) / 1000 = 1.3 mA

This seems like quite a low current for a LED... I looked through some LNJ packaged amber LEDs, and almost all of them require 10 mA... so, how does this actually work?

Thank you in advance.


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