Rev B vs Rev C

Question

Hi,

Two questions:

1. How do I know if I have a Rev C board? I received a board recently that has a sticker with the following: S15-1899, SN:00014. It does not indicate Rev B or C, is this a Rev C board?

2. Is there a document that shows the changes from Rev B to Rev C?

Thanks

mbrown · Accepted Answer

Hi Darryn,

Rev B SOMs have a sticker that says RFSOM REV B located on the bottom side, as you noticed, just above the etch AES-PZSDR-Z7035-AD9361-G. Rev C SOMs have a sticker with an S15- designator and an enumerated SN, but not revision printed. No other versions have been shipped.

It sounds as though you may have both vintages. The difference between B and C are very small and result in no functional changes; mostly making the schematics match what is in the BOM and choosing a few parts that were easier to place.

Summary:

Added a pull up and pull down to the (Y1) crystal
Replaced the 2 pin Ethernet Phy crystal (Y2) with a 4 pin
Replaced the six pin BGA (U23) ADP7112-3.3 with ADP7118 sot-23
Pull up/down resistors (R26, R37) are now DNP
50 ohm series (R60) is now 0ohm

/Matt