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[ 10 posts ] |
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0x4C4A
Joined: 07 Nov 2016, 10:43
Posts: 9
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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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| 27 Jan 2017, 11:40 |
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gedass
Joined: 07 Dec 2011, 16:01
Posts: 525
Location: Lithuania
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| 27 Jan 2017, 11:54 |
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iggarpe
Joined: 08 Nov 2013, 10:13
Posts: 10
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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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| 24 Mar 2017, 12:49 |
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iggarpe
Joined: 08 Nov 2013, 10:13
Posts: 10
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Heeeellooooo? Is there anyone from 8devices actually reading this forum?
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| 07 Apr 2017, 12:01 |
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gedass
Joined: 07 Dec 2011, 16:01
Posts: 525
Location: Lithuania
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Support don't read this forum. All issues should be posted here: https://github.com/8devices
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| 07 Apr 2017, 13:36 |
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iggarpe
Joined: 08 Nov 2013, 10:13
Posts: 10
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| 07 Apr 2017, 15:39 |
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gedass
Joined: 07 Dec 2011, 16:01
Posts: 525
Location: Lithuania
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You can connect spi nor flash like here.
Attachments:
SPI_NOR.PNG [ 72.32 KiB | Viewed 9000 times ]
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| 07 Apr 2017, 18:18 |
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gedass
Joined: 07 Dec 2011, 16:01
Posts: 525
Location: Lithuania
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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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| 07 Apr 2017, 18:26 |
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DaveHaynie
Joined: 07 Nov 2017, 17:19
Posts: 3
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| 09 Nov 2017, 13:54 |
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DaveHaynie
Joined: 07 Nov 2017, 17:19
Posts: 3
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| 09 Nov 2017, 14:02 |
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