RE: Azure Sphere Secure IOT - A closer look

Workshopshed — Sat, 17 Nov 2018 20:34:50 GMT

The thought about the antenna was correct but it's not a zero ohm resistor that needs resoldering, it's a capacitor.

[View:/resized-image/__size/322x345/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-05e45df1-7961-439a-9075-c8836d08d4e8/contentimage_5F00_189128.png:322:345]

From: https://docs.microsoft.com/en-us/azure-sphere/hardware/mt3620-user-guide#wi-fi-antennas

RE: Azure Sphere Secure IOT - A closer look

Workshopshed — Sat, 10 Nov 2018 23:27:57 GMT

From a twitter discussion it looks like I've picked the wrong chip when trying to identify the RTC. The "74LCX126" is a "Low Voltage Quad Buffer with 5V tolerant Inputs and Outputs" and that comes in the DQFN package that was the one I'd picked.

[View:/resized-image/__size/160x128/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-05e45df1-7961-439a-9075-c8836d08d4e8/2742.contentimage_5F00_189125.png:160:128]

[View:/resized-image/__size/620x347/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-05e45df1-7961-439a-9075-c8836d08d4e8/1346.contentimage_5F00_189126.png:620:347]

Some further reading of the data sheet shows that the RTC is part of the main SOC so actually we'd not expect an external chip for that one.

[View:/resized-image/__size/541x551/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-05e45df1-7961-439a-9075-c8836d08d4e8/8203.contentimage_5F00_189127.png:541:551]