GPIO port voltage

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mad_ady
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GPIO port voltage

Unread post by mad_ady » Sat Dec 28, 2019 2:59 am

I haven't seen this, but are GPIOs 3.3V or 3.0V like the N1?

Wiki seems to indicate they're 3.0V on the 10 pin header:
6 3.0V POWER
Last edited by mad_ady on Sat Dec 28, 2019 2:59 am, edited 1 time in total.

joy
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Re: GPIO port voltage

Unread post by joy » Sat Dec 28, 2019 5:30 am

Yes. Their voltage level is 3.0V.
vcc_3v0 from DCDC4 of PMIC is set as 3.0V.
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hominoid
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Re: GPIO port voltage

Unread post by hominoid » Sun Dec 29, 2019 2:38 am

joy wrote:
Sat Dec 28, 2019 5:30 am
Yes. Their voltage level is 3.0V.
vcc_3v0 from DCDC4 of PMIC is set as 3.0V.
Might want to change or clarify the Specifications chart in the announcement, under External I/O It says (IC2, GPIO, IRQ at 3.3Volt).

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Re: GPIO port voltage

Unread post by joy » Sun Dec 29, 2019 4:10 pm

hominoid wrote:
Sun Dec 29, 2019 2:38 am
Might want to change or clarify the Specifications chart in the announcement, under External I/O It says (IC2, GPIO, IRQ at 3.3Volt).
Yes. You're right.
Current output of dcdc4 of pmic is 3.0V and it's available to control the output by sw.
Let me check it and discuss with HW team to clarify the point. ;)
I think there can be something that I missed. :o

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Re: GPIO port voltage

Unread post by joy » Mon Dec 30, 2019 2:15 pm

@hominoid, @mad_ady,

The default IO voltage level 3.0V of GO advanced schematics and SW setting is based on RK3326 reference EVB.

We will put some stress and aging tests carefully to support 3.3V IO voltage by adjusting DCDC4 and related LDOs of PMIC.
According to RK3326 datasheet, it guarantees 3.3V typical operation condition of digital gpio power.
Once hw review and all tests are done, I will share the status.
If there is no big issue, related materials will be updated.

Thank you for your valuable comments again. :D
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mad_ady (Mon Dec 30, 2019 6:26 pm) • hominoid (Tue Dec 31, 2019 1:25 am)

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Re: GPIO port voltage

Unread post by joy » Wed Jan 08, 2020 9:55 am

Hi.
We've put some basic tests and heavy load tests with 3.3V IO voltage for 5 days and there was no issue.
IO voltage with 3.3V has been confirmed.
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rooted (Wed Jan 08, 2020 10:43 am) • mad_ady (Wed Jan 08, 2020 4:42 pm)

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Re: GPIO port voltage

Unread post by rooted » Wed Jan 08, 2020 10:44 am

joy wrote:Hi.
We've put some basic tests and heavy load tests with 3.3V IO voltage for 5 days and there was no issue.
IO voltage with 3.3V has been confirmed.
That's great news, 3.3v is so much more compatible.

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