You can connect spi nor flash like here.
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| GPIO voltage tolerance https://www.8devices.com/community/viewtopic.php?f=22&t=993 |
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| Author: | 0x4C4A [ 27 Jan 2017, 11:40 ] |
| Post subject: | GPIO voltage tolerance |
Hello! I'd like to find out what are safe voltages for the GPIO inputs. In this specific case I'm interested in whether I can connect my 3V3 SPI device directly to the SPI pins and not harm the Rambutan module or do I need to use some voltage level translator IC. |
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| Author: | gedass [ 27 Jan 2017, 11:54 ] |
| Post subject: | Re: GPIO voltage tolerance |
| Author: | iggarpe [ 24 Mar 2017, 12:49 ] |
| Post subject: | Re: GPIO voltage tolerance |
I noticed that in the Rambutan evaluation board the external SPI serial flash is powered from 3.3V. Is this an error? (and should be powered from 2.5V?) (my Rambutan development board does not have the external SPI serial flash assembled, which would be coherent with 3.3V power being an error) |
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| Author: | iggarpe [ 07 Apr 2017, 12:01 ] |
| Post subject: | Re: GPIO voltage tolerance |
Heeeellooooo? Is there anyone from 8devices actually reading this forum? |
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| Author: | gedass [ 07 Apr 2017, 13:36 ] |
| Post subject: | Re: GPIO voltage tolerance |
Support don't read this forum. All issues should be posted here: https://github.com/8devices |
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| Author: | iggarpe [ 07 Apr 2017, 15:39 ] |
| Post subject: | Re: GPIO voltage tolerance |
| Author: | gedass [ 07 Apr 2017, 18:18 ] | ||
| Post subject: | Re: GPIO voltage tolerance | ||
You can connect spi nor flash like here.
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| Author: | gedass [ 07 Apr 2017, 18:26 ] |
| Post subject: | Re: GPIO voltage tolerance |
BTW... SPI_MOSI (aka gpio7) and SPI_CLK (aka gpio6) pins are bootstrap. gpio7: high - sdram enable, low - sdram disable gpio6 (boot select): high - from ROM, low - from SPI flash. |
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| Author: | DaveHaynie [ 09 Nov 2017, 13:54 ] |
| Post subject: | Re: GPIO voltage tolerance |
| Author: | DaveHaynie [ 09 Nov 2017, 14:02 ] |
| Post subject: | Re: GPIO voltage tolerance |
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