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]

It could be that the nRF9160 have been damaged in the process, do you have other boards to test? Also check other components, it could be that you are missing other components.

Kenneth

[_bhanu]

Hi,

Kenneth said:

lso check other components, it could be that you are missing other components.

We cross checked the entire PCB board every components are placed correctly. may be the nRF9160 have been damaged.

Thanks

[Kenneth]

I suspect you have damaged the chip, considering the absolute maximum ratings says that the I/O pin voltage must maximum be <VDD_GPIO+0.3V, and since VDD_GPIO have been 0V, then I/O voltage should not have exceed 0.3V. 

https://infocenter.nordicsemi.com/topic/ps_nrf9160/abs_max_ratings.html 

[_bhanu]

Hi,

if i change the nRF9160 is their any possibility that it will work as normal?

what are causes that nRF9160 damage.

Thanks

[Kenneth]

Very likely EOS damage.

Kenneth