Hey, I ordered and received a Balena Fin developer kit the other week from the Resin.io store. There’s what’s looks like a revision sticker saying “F 35/18” on the back on the board I received.
We’re looking to build an outdoor-climate-proof solution, so the combination of the Balena Fin and Resin.io caught my eye as a quick way to market for the first iteration of our product, given that the Balena Fin datasheet on page 11 specifies an operating temperature range of -25C ~ 70C.
The board uses the SMSC/Microchip LAN9514 chip as a combined USB hub and Ethernet 10/100 controller/PHY. When inspecting the board, I noticed that it had the LAN9514-JZX variant, and not the LAN9514i-JZX one.
The two variants have these operating temperature specs:
- LAN9514-JZX: Commercial temperature range: 0C ~ 70C
- LAN9514i-JZX: Industrial temperature range: -40C ~ 85C
So, it seems like at least on the board I received, this chip was of the commercial temperature range kind, and thus rated at a narrower temperature range than the specified Balena Fin temperature range.
For reference, here’s a close-up of the board I received:
The relevant chip is in the middle of the photo, and as you can see, it’s the LAN9514-JZX variant. (Not LAN9515i-JZX)
So, Resin.io, what you can make of this? Misunderstanding on my part? Design mistake? Logistics/manufacturing mishap?
Either way, I hope we can eventually end up with a Balena Fin that’s designed/manufactured to work in cold temps.