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Max. current on GPIO ports?
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starblue
Joined: 16 Sep 2012, 11:30 Posts: 2
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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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16 Sep 2012, 11:41 |
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gedass
Joined: 07 Dec 2011, 16:01 Posts: 525 Location: Lithuania
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re
Attachments:
3050_gpio_current.JPG [ 108.68 KiB | Viewed 3724 times ]
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16 Sep 2012, 11:51 |
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starblue
Joined: 16 Sep 2012, 11:30 Posts: 2
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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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16 Sep 2012, 16:26 |
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Theo
Joined: 26 Dec 2011, 16:49 Posts: 11
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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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18 May 2013, 10:18 |
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