Dennis Field / dvk-mx8m-bsb - History

added company logo and designers email addresses into drawing area
new library with symbol of Emcraft-SOM (for later use)

Add quartz crystal footprints, reassign BHC-18650-1P footprint & associated component properties, add BHC-18650-1P 3D model

Add FET (Q* reference designators) footprints

Some footprints are slightly edited versions of their KiCad official library equivalents, using the existing 3D models. DMG2301L's SOT-23 footprint is identical to the official one in the KiCad library.

Connect VCC of the USB1_VBUS comparitor (TLV3201AIDBVR) to 5V_SOM instead of 5V_P so that VBUS presence can be detected quickly enough for the USB Serial Downloader bootmode, connect the TVS diodes on the HDMI receptacle to the proper pins

Assign footprints and component properties to all diodes (including LEDs)

Using Lite-On's LTST-C190GKT (0603, 2.1V @ 20mA) instead of Broadcom's HSMG-C170 (0805, 2.2V @ 20mA) in the ethernet circuit.

Add decoupling/stitching capacitors to the 5V_P, 3V3_P, and 1V8_P rails which will be spread through the respective power planes (not necessarily having to be near chips)

Add preliminary Bill-of-Materials, fill in more missing component information such as inductor selection for the 3V3(_P) rail

Most critical components should now be getting ordered.

Replace the AP22800 load switch with the P-channel AP22814 load switch IC due to its reverse current & over current protection capability, add level shifter circuit to the WWAN's DPR signal

Reverse current is no longer an issue with the load switches. One more obvious "TODO" for the schematic left which is to simply place several 100nF bypass caps on the 5V_P, 3V3_P, and 1V8_P rails (investigate how EmCraft is placing these in their layout).

Add decoupling capacitors near the WLAN+BT M.2 Key E socket, assign the tantalum capacitors their various footprints, find suitable 220uF tantalum bulk capacitors for the M.2 modules which are rated to 10V

Need to figure out if the load switch IC (AP22800) that derives 3V3_P is fine with having the large output capacitance (no unwanted reverse current).