First prototype. Based on the reference design provided by Arribada. RF traces are calculated with JLC2313 stackup. PCB manufactured by JLCPCB.
Assembled board weighs less than 2g.
- Power regulators / switch
What didn't work:
- Solar charging
- SPI flash
Apparantly, the "optional" MPPC function on the solar charger IC was not so optional after all.
I also messed up the symbol for the flash chip. The datasheet listed the BGA balls bottom-up, I assumed it was top-down.