firmware was not uploading into nRF9160 custom board

[_bhanu]

Hi,

im trying to upload the firmware to my new nRF9160 custom board while im trying to uploading im getting below error

Failed to load readback protection status: async task failure for id: 59341008799 msg: [jlink] JLINKARM_DLL_ERROR (Origin: "Error when running operation: protection-get")

we have already another batch nRF9160 custom boards in that batch we didn't face this issue but in new batch Custom boards only i'0m getting this issue.

while i'm debugging the cause i found that SWDIO PIN i'm not getting 3.3V may i know the reason why SWDIO pin not generating 3.3V what maybe causes?

[Kenneth]

Hello,

All GPIOS (including SWD pins) should match VDD_GPIO voltage:
https://infocenter.nordicsemi.com/topic/ps_nrf9160/recommended_op_conditions.html 
https://infocenter.nordicsemi.com/topic/ps_nrf9160/pmu_regulators.html#normal 

Also, check what programmer are you using here? Have you tried a different programmer? Have the design changed?

Best regards,
Kenneth

[_bhanu]

Hi,

Kenneth said:

Have the design changed?

No design haven't changed and i have tried with nRF desktop programmer too but no use still i,m facing same. And i'm not getting 2.1V throughout RESET. 

I their any change that the assembly issue is also cause for this problem

Thank you

[Kenneth]

Hello,

If you have a working and failing board it could be interesting to compare for instance VDD_GPIO and other voltages on the board for differences, are you able to do that? 

Kenneth

[_bhanu]

Hi,

Kenneth said:

If you have a working and failing board it could be interesting to compare for instance VDD_GPIO and other voltages on the board for differences,

Yes i have cross verified the working and failing bord VDD_GPIO in working board I'm getting 3.3V but failing board I'm getting 0V.

[Kenneth]

The VDD_GPIO is an external supply to the nRF9160, it's not generated by the nRF9160. Have you looked at the circuitry that should generate this voltage?

Kenneth