• State Not Answered
  • +1 person also asked this people also asked this
  • Replies 17 replies
  • Subscribers 75 subscribers
  • Views 3287 views
  • Users 0 members are here
Attachments (0)
Nordic Case Info
  • Case ID: 234199
Options
This post is older than 2 years and might not be relevant anymore
More Info: Consider searching for newer posts

nRF52840 Lead Finish of the BGA Balls

John

We are having a very difficult time soldering the nRF52840 to the PCB. Our Operations Department is asking what the lead finish of the BGA balls is. Would be great to get on the phone with you guys to discuss all the things we have tried. You might have some ideas. Thank you!

Parents
  • 0

    Hello,

    Haven't heard from you folks in a couple of days. Would really appreciate some help. I have some new information. Turns out we only use the HFXO when we use the BLE radio. We ran a test where we turned off BLE so we are never using the HFXO. The product goes to sleep and wakes up using the HFINT only. Will still see resets on our boards when they are running at -20C. If we switch to constant latency mode, we never see any resets. So I don't think the issue is with the 32MHz crystal. I think we are running into an issue when we are waking up from sleep. Perhaps we can run a test where we sleep/wake-up a lot more often to see if this increases our error rate. This is a huge problem for us. We have delayed the release of this product for two months while we've been trying to fix this. We thought it was a soldering issue and we have recently upgraded from a 7-zone to a 10-zone reflow oven. I'm thinking now the problem isn't a soldering issue. Hope to hear from you soon.

Reply
  • 0

    Hello,

    Haven't heard from you folks in a couple of days. Would really appreciate some help. I have some new information. Turns out we only use the HFXO when we use the BLE radio. We ran a test where we turned off BLE so we are never using the HFXO. The product goes to sleep and wakes up using the HFINT only. Will still see resets on our boards when they are running at -20C. If we switch to constant latency mode, we never see any resets. So I don't think the issue is with the 32MHz crystal. I think we are running into an issue when we are waking up from sleep. Perhaps we can run a test where we sleep/wake-up a lot more often to see if this increases our error rate. This is a huge problem for us. We have delayed the release of this product for two months while we've been trying to fix this. We thought it was a soldering issue and we have recently upgraded from a 7-zone to a 10-zone reflow oven. I'm thinking now the problem isn't a soldering issue. Hope to hear from you soon.

Children
No Data
Related
Terms of service