NRF52 PCB inconsistent issues.

[lee.W]

I have designed a few PCBs using the NRF52 chip with a standard QFN48 pattern. On the first design, we had 8 PCB's made of which, only 2 worked correctly. The others all exhibited different issues including.

A couple of these boards seemed to 'reset' the JLink when I click 'Segger 682646773' in nRFgo Studio. One of these boards passed this stage and programmed but I saw no advertising. It was transmitting data through the RTT segger link however. The last few drew upwards of 150mA before any programming.

We know our schematics are okay as we have had working pcbs with the nordic ic in the past.

We have recently designed another circuit using this chip and unfortunately out of the 10 we received only 1 was working with the others all showing different problems.

I was wondering if anybody else has seen these issues when designing and building PCBs using the NRF52?

Thanks

[AmbystomaLabs]

We have had no issues at all on custom boards. I would be happy to review the gerbers for your board if you wish to share.

[lee.W]

That would be great thank you. What is your email address to send them too?

[AmbystomaLabs]

[email protected]

[Hung Bui]

150mA is way too much if the board only contains the nRF5 chip. You may want to post your schematic and layout for reviewing.

[lee.W]

Thanks to Richard from ambystomalabs we have found a reason for our problems. Primarily due to the pattern we used for the Nordic IC. - So thanks again Richard.