nrf_asset_tracker_v2 thingy91 accelerometer movement detection failed

[DevNetNow]

Hi 

testing with thingy91 v1.4.0, firmware 1.5.1.

I never succeeded to enable passive mode of nrf_asset_tracker_v2 no acceleration is detected. 

Someone experience the same issue?  

[Øyvind]

Hi, can you please build the asset tracker with the debug overlay, which will add additional verbose logging capabilities to the application. 

Have your verified that you are using NCS v1.5.1? There is a known bug on the master branch that will cause the first GPS fix to hang. Our team is currently working on a fix for this, but in the meantime using v1.5.1 should be sufficient. Also, what modem version are you running on your device?

Another tip is to update the Connectivity Bridge on the nRF52 device on the Thingy:91 just to be on the same side. There is a pre compiled version in the pre compiled fw package, under the downloads tab on the Thingy:91 product page.

Thanks,
-Øyvind

[DevNetNow]

Hello,

After some digging, i just found that the whole system work perfectly with external power bank, or when USB is plugged. 

I'll do more tests with the power profiler. 

the problem is the PMIC, any added external power consumer need a PMIC with higher specs. 

may be my antenna is current hangry, i'll try with another antenna. 

[DevNetNow]

Hi

Yes i'm using NCS v1.5.1 

yes i have changed the connectivity bridge of the nrf52840 to send the logs on bluetooth for unplugged tests. 

regards 

[Øyvind]

Glad to hear that it's working!

[DevNetNow]

Hello,

I found the issue origin, but still my problem is not solved. there is no way to put a power bank next to the final product. If external 5V powering is needed all the time, there is no reason to put a battery.  

I need to redesign my custom board with another PMIC, i choosed the ADP5360 for quick design convenience). 

Meanwhile, i just noticed that thingy91 v1.6.0 have power management improvements. Here is the change log "Power optimization, added circuitry to turn off RF switches when not used "

When we look at the design deltas : 

v1.6.0 : 

v1.4.0 

i suppose i'm not the first one experiencing issues with COEX and power signals managements. 

I ordered recently from mouser they still have the version 1.4.0 stocked. so i can't test if the issue is resolved in v1.6.0. 

i'm wondering if it worth a try with the modified design like in v1.6.0.

i would love to hear from hardware guys with more detailed reasons of this hardware change?

do they experience voltage drops when external antenna is plugged like in my case ? 

do they still advice usign ADP5360 for custom designs and additional  power consumers ? 

Thanks for your feedback.