GPIO port voltage

Post Reply
User avatar
mad_ady
Posts: 7113
Joined: Wed Jul 15, 2015 5:00 pm
languages_spoken: english
ODROIDs: XU4, C1+, C2, N1, H2, N2, Go, Go Advance
Location: Bucharest, Romania
Has thanked: 308 times
Been thanked: 212 times
Contact:
Contact mad_ady

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.
Top
joy
Posts: 993
Joined: Fri Oct 02, 2015 1:44 pm
languages_spoken: english
ODROIDs: ODROID-C1+, XU4, X
Has thanked: 39 times
Been thanked: 94 times
Contact:
Contact joy

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.
These users thanked the author joy for the post:
mad_ady (Sat Dec 28, 2019 4:27 pm)
Top
hominoid
Posts: 326
Joined: Tue Feb 28, 2017 3:55 am
languages_spoken: english
ODROIDs: C2, XU4, MC1, N1, N2
Location: Lake Superior Basin, USA
Has thanked: 13 times
Been thanked: 25 times
Contact:
Contact hominoid

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).
Top
joy
Posts: 993
Joined: Fri Oct 02, 2015 1:44 pm
languages_spoken: english
ODROIDs: ODROID-C1+, XU4, X
Has thanked: 39 times
Been thanked: 94 times
Contact:
Contact joy

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
Top
joy
Posts: 993
Joined: Fri Oct 02, 2015 1:44 pm
languages_spoken: english
ODROIDs: ODROID-C1+, XU4, X
Has thanked: 39 times
Been thanked: 94 times
Contact:
Contact joy

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
These users thanked the author joy for the post (total 2):
mad_ady (Mon Dec 30, 2019 6:26 pm) • hominoid (Tue Dec 31, 2019 1:25 am)
Top
joy
Posts: 993
Joined: Fri Oct 02, 2015 1:44 pm
languages_spoken: english
ODROIDs: ODROID-C1+, XU4, X
Has thanked: 39 times
Been thanked: 94 times
Contact:
Contact joy

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.
These users thanked the author joy for the post (total 2):
rooted (Wed Jan 08, 2020 10:43 am) • mad_ady (Wed Jan 08, 2020 4:42 pm)
Top
User avatar
rooted
Posts: 7136
Joined: Fri Dec 19, 2014 9:12 am
languages_spoken: english
Location: Gulf of Mexico, US
Has thanked: 387 times
Been thanked: 108 times
Contact:
Contact rooted

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.
Top
Post Reply

Return to “General Topics”

Who is online

Users browsing this forum: midwan and 2 guests