maybe unrelated but in the digital world, many chips won't be able to source or sink the current needed to drive an LED or drive it for long periods of time. I've often had to use drivers (or buffers) to light LEDs from the outputs of other devices like an FPGA or microcontroller.
azira said:
aren't there leds that shine different colors when driven by different voltage / current / frequency?
so you can use a driver to control the color.
Low current LEDs
Some chips can't drive standard LED's, some do. Always check datasheets for that. I use Fairchild HLMP-1700 ( red ) and HLMP-1790 ( green ) from Farnell with no problems whatsoever. Iforward is 1 to 7 mA on those.
Never heard of a chip that can't drive them 😉
http://www.fairchildsemi.com/pf/HL/HLMP-1700.html
Some chips can't drive standard LED's, some do. Always check datasheets for that. I use Fairchild HLMP-1700 ( red ) and HLMP-1790 ( green ) from Farnell with no problems whatsoever. Iforward is 1 to 7 mA on those.
Never heard of a chip that can't drive them 😉
http://www.fairchildsemi.com/pf/HL/HLMP-1700.html
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