upgrade sdk 1.9.1 to 2.0.0

[Ofir_A]

Hi,

We upgrade our SLM app from sdk 1.9.1 to sdk 2.0.0 and now when we try to look for GPS there is a reduction at the voltage from 3.3 to 2

what are we missing? what changes affect the gpio voltage?

[flaik-wayne]

Do you have two GPIOs driving in different directions? This is probably the only way a GPIO could change voltage, unless it is an analog output pin of some kind? Which pin are you referring to?

[Ofir_A]

flaik-wayne said:

Do you have two GPIOs driving in different directions?

no

flaik-wayne said:

Which pin are you referring to?

COEX0

The input for Nordic GPIO is 3.3V but I get out of the Nordic is 2.1V

Can it be somehow related to configuration of the application? when I use SDK 1.9.1 all works perfect

[JONATHAN LL]

Hi,

Seems like the is something SW related here.

Are you also getting 2.1V on any other GPIO's or is it just the COEX0?

The COEX pin follows the voltage on the VDD_GPIO on the nRF9160.


Is this a custom board?

- If it is custom, could you also test your SW on a 9160DK, see if it behaves the same way?


Regards,
Jonathan

[Ofir_A]

Hi,

JONATHAN LL said:

Are you also getting 2.1V on any other GPIO's or is it just the COEX0?

All GPIO's

JONATHAN LL said:

Seems like the is something SW related

It is software related since if I go back to SDK 1.9.1 all works perfect

There is something different at SDK2.0.0 from 1.9.1 that is doing this and I don't know what and need help to figure this out

[JONATHAN LL]

This does sound strange, can you share more details on what is going on in you system?

What pins are directly controlling this regulator? 

What is the voltage on VDD_GPIO?

Can you share your schematic or parts of it? the 9160 section and the power section?

Do you have a nRF9160DK,  can you replicate the issue you are seeing there?

Regards,
Jonathan