Original date: 2022-08-29

Related tweets: [1] [2] [3]

I finished designing the new X1000 SoM, and the main changes were:

• Added 32k crystal for proper shutdown of the main clock domain
  
  • Let's hope the suspend-to-RAM will work properly this time!
• Changed to a modern 2.2MHz buck DC-DC w/ PFM mode
  
  • It's supposed to use a lot less power when in idle
• Form factor changed from castellated holes to LGA pads
  • Better mass production quality and the ability to V-CUT
  • Contributes to the mechanical strength of the underlying PCB better when soldered
• Added clearance space for installing a metal cover
  • Provides a chance to improve EMI performance & mechanical strength even more

It was submitted to the PCB factory in the same day.

It's also worth noticing that this new SoM was not exclusively designed for this project. Now it can be used for other purposes, and even in harsh conditions like industry control (will industry control system designers ever choose a SoM with cute drawings on it? lol). All components on it are qualified for operating in -40 to 85 degrees. I also ensured that every wire has a near continuous ground plane this time.