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| Max. current on GPIO ports? https://www.8devices.com/community/viewtopic.php?f=1&t=192 |
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| Author: | starblue [ 16 Sep 2012, 11:41 ] |
| Post subject: | Max. current on GPIO ports? |
How much current can the GPIO outputs source/sink? I couldn't find anything about that in the RA3050 data sheet, only power supply currents. I want to connect opto-couplers to the outputs to control a KeyMatic door unlocker, and I'm wondering if I can connect them directly or if I need transistors to amplify the current. I guess that the LEDs on the development board use about 5mA. Jürgen |
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| Author: | gedass [ 16 Sep 2012, 11:51 ] | ||
| Post subject: | Re: Max. current on GPIO ports? | ||
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| Author: | starblue [ 16 Sep 2012, 16:26 ] |
| Post subject: | Re: Max. current on GPIO ports? |
Thanks for the very quick reply. Looks like it will work fine with the opto-coupler driven directly by the port. |
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| Author: | Theo [ 18 May 2013, 10:18 ] |
| Post subject: | Re: Max. current on GPIO ports? |
This table is a bit confusing because both IOL and IOH have the same description 'Low Level Output Current'. If you connect a LED which draws less than 10mA it should be no problem. For higher currents the information in the table becomes more important though. |
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