lpcware

Led indicator to Reset button

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by jhd on Mon Feb 08 03:03:18 MST 2016
Hello!,

In LPC1549 Expresso board schematic in page 3, label RESET there is a Led Osram  LS Q976 with 2.2KΩ resistor.

http://www.osram-os.com/Graphics/XPic9/00128792_0.pdf

Ohm law say:

R = V / I

R = (3.3 - 2) / 0,025A = 52Ω   0.032 watts

Why the designer chose 2.2KΩ?.  I must be missing something.

Regards

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