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
GPIO port voltage
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Re: GPIO port voltage
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
Yes. You're right.hominoid wrote: ↑Sun Dec 29, 2019 2:38 amMight want to change or clarify the Specifications chart in the announcement, under External I/O It says (IC2, GPIO, IRQ at 3.3Volt).
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.

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Re: GPIO port voltage
@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.
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.

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Re: GPIO port voltage
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.
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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Re: GPIO port voltage
That's great news, 3.3v is so much more compatible.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.
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