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ADSP2126x and LED in current sink mode

Question asked by Hfuhrhurr on May 31, 2011
Latest reply on Jun 27, 2011 by DeepV

Hi all,

 

 

from the documentation of the ADSP21261, I see that it is capable of driving only some micro-amperes from output pins (FLAGS0-15, e.g.)

I understand from the diagram (Fig. 28 in ADSP21261 data sheet) that in current sink mode, it is possible to "drive" up to 30 mili-amperes at 3.3V.

 

1. are these 30 mili-amperes valid for every single pin or for a group of pins? E.g. 30 mili-amperes for every single Flag pin?

2. is it a recommended design to use multiple LEDs in current sink mode ? Or should a buffer be used in current source mode as e.g. in the EZ-Kit lite?

 

Best regards,

 

Rainer

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