Led indicator to Reset button

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Led indicator to Reset button

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lpcware
NXP Employee
NXP Employee
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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lpcware
NXP Employee
NXP Employee
Content originally posted in LPCWare by jhd on Sun Apr 24 08:02:13 MST 2016
Thanks Ian,

Regards
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454件の閲覧回数
lpcware
NXP Employee
NXP Employee
Content originally posted in LPCWare by IanB on Sun Mar 27 09:06:34 MST 2016
because he didn't want it full brightness.
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