ERROR: Low voltage detected at source, NRF52 and J-link

[NathanH]

Using latest download of nrf Command Line Tools and a J-link Plus unit with Tag-Connect interface.  Power on, all connections seem good.  Trying to upload a .hex file through a batch file command in Windows and keep getting this error.  I'm not using J-link Commander but can't connect there either when I tried.  Looking for ideas to check or fix!

[Jared]

Hi,

• Exactly what error are you getting?
• Are you using a custom board? If so, could you provide the schematics and layout?
• Could see if your device is listed if you enter this nrfjprog command:

nrfjprog --ids

regards

Jared

[awneil]

You should be able to use the Segger tools to report what voltage it is seeing from the Target.

Segger have a page on diagnosing J-Link problems:

https://wiki.segger.com/J-Link_cannot_connect_to_the_CPU

[NathanH]

Thanks for the help, I ended up finding that the momentary ON button was not being depressed during programming;  I was under the impression originally that the unit provided power on its own but found differently.  Thanks for the responses and attention on this!

[awneil]

You're welcome.

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