Could not find core in Coresight setup nRF52840 ?

[RixtronixLAB]

Dear Members,

I got :

Could not find core in Coresight setup nRF52840 ? with PCA10059, it was working ok before,

Any solution for it ?

Kind regards,

Rixtronix LAB

[RixtronixLAB]

[RixtronixLAB]

Is the chip failed already ?

[Vidar Berg]

The correct IO voltage depends on how you are you powering the dongle (see Power supply options) and the REGOUT0 setting if you use high voltage mode.

[RixtronixLAB]

Hi Vidar,

Thanks for the reply,

I connected Vcc from J-Link to Vbus and GNd to GND,

It was working but now it's not,

Looks like the chip is faulty, do you reckon ?

Kind regards,

Rixtronix

[RixtronixLAB]

Do you reckon my internal regulator is faulty ? I used external 5V to Vbus, it's still not responding...??

Regards,

Rixtronix

[Vidar Berg]

I can't pinpoint where the fault based on the information provided here.

What is the VTarget/Vtref pin connected to since it's 3.3 volts? It should be the same as the IO voltage, which you measured to be 2.2 volts

RixtronixLAB said:

Connecting ...
 - Connecting via USB to probe/ programmer device 0
 - Probe/ Programmer firmware: J-Link ARM V8 compiled Nov 28 2014 13:44:46
 - Device "NRF52840_XXAA" selected.
 - Target interface speed: 4000 kHz (Fixed)
 - VTarget = 3.313V

[RixtronixLAB]

Hi Vidar,

thanks for the reply,

I'm not sure as well, suddenly our PCA10059 is not responding properly,

I did well before,

Worse care, we need to replace the chip,

We want use external supply and see the response,

Any suggestions ?

Thanks,

Kind regards,

Rixtronix LAB