Why I cannot download firmware into my 52840? USB cable is the only power supply.

RE: Why I cannot download firmware into my 52840? USB cable is the only power supply.

Øyvind — Fri, 22 Nov 2019 09:22:56 GMT

This is a common issue if users are programming via a DK. This is too low to be used with the onboard programmer on e.g. nRF52840 DK. If you have an external programmer i.e. Segger JLink, it will support programming down to 1.8V

RE: Why I cannot download firmware into my 52840? USB cable is the only power supply.

ndc_bee — Fri, 22 Nov 2019 01:52:58 GMT

I realize this, but the REGOUT0 is default output 1.8V, if I cannot download firmware at first, how could I configure it to 3.3V?

now our prototype is designd with high voltage mode powerd by a USB cable, and I didn't design test point for the VDD, this mean if I want to download firmware into the chip, I must power the chip from the VDD pin with 3.3V by soldering a jumper, this is very inconvenient.

The default output voltage dose not support firmware downloading is incomprehensible. Or I have some misunderstanding about this?

Do other customers have no such troubles?

RE: Why I cannot download firmware into my 52840? USB cable is the only power supply.

Øyvind — Thu, 21 Nov 2019 14:56:39 GMT

That would explain it. Please try to configure REGOUT0 to 3.3V. More information found in the Main Supply chapter.

Kind regards,
Øyvind

RE: Why I cannot download firmware into my 52840? USB cable is the only power supply.

ndc_bee — Thu, 21 Nov 2019 09:58:10 GMT

I think I have found the root couse, when I power the 52840 from VDDH by a USB cable, the VDD voltage is only 1.8V, 1.8V is not enough to burn the firmware into the chip?

RE: Why I cannot download firmware into my 52840? USB cable is the only power supply.

Øyvind — Thu, 21 Nov 2019 08:16:31 GMT

I can't find anything about this. Where have you heard this? Can you provide a link?

There should not be any issues with programming when powering the board with USB to VDDH. Have you measured the voltage on your device when powered by USB?

RE: Why I cannot download firmware into my 52840? USB cable is the only power supply.

ndc_bee — Thu, 21 Nov 2019 07:19:00 GMT

I just heard that the 52840 has 2 versions, C version and D version. and the C version has problems on VDDOUT function?

Is that mean C version cannot use high voltage mode?

RE: Why I cannot download firmware into my 52840? USB cable is the only power supply.

ndc_bee — Thu, 21 Nov 2019 01:10:59 GMT

I use JLINK to download firmware, connect VDD/VDDH , GND ,SWDIO, SWCLK to JLINK.

when I use usb cable power the 52840 from the VDDH, I cannot download firmware.

but if I use 3.3V power the 52840 from the VDD, It works.

RE: Why I cannot download firmware into my 52840? USB cable is the only power supply.

Øyvind — Wed, 20 Nov 2019 11:46:01 GMT

Hello,

Can you give me some more details? You can't download if powered by VDDH, but you can download if powered by VDD? How are you connecting to your device to download/program it?

Kind regards,
Øyvind