Ross Myers

Coldfire, driving LED's direct, good or bad?

Discussion created by Ross Myers on Jun 23, 2009
Latest reply on Jul 20, 2009 by Paul McInnes

Hi All,

 

I've seen in the MCF51JM docs the drive strength registers for the outputs. The data sheet says each pin can sink 25mA. Ignoring the max current the MCU should draw overall for now, is it really a good idea to drive an LED directly from the port? 

 

I've often used a digital FET for ease of use to control LED's off a micro, I'd be interested to hear some opinions with regards to the parts/real estate savings made in driving the LED's directly is worth the risk (if there is one).

 

Thanks,

Ross

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