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uob-hep-cad / uob-hep-pc072

DUNE MIB
CERN Open Hardware Licence Version 2 - Strongly Reciprocal
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Replace board-sense diode (D12) with Schottky version. Move R102 so that diode can be completely decoupled from MMC uController #25

Open DavidCussans opened 1 month ago

DavidCussans commented 1 month ago

NAT PSU is not supplying 3.3V management power to MIB.

We suspect that the board sense circuit ( the diode between AMC_N-PS0 and AMC_N-PS1 ) isn't functioning correctly. The AFC design (that does work) has a schottky diode directly across AMC_N-PS0 and AMC_N-PS1 , and doesn't have the extra connections to the MMC uController that the MIB ( derived from CERN MMC design ) does.

--> Mimic AFC design. Replace PIN diode D12 in MIB design with Schottky and add ability to disconnect diode , AMC_N-PS0 and AMC_N-PS1 from the rest of the circuitry (using DNF links).

  1. Replace R103 with DNF link
  2. Add DNF link between BP.AMC_N-PS<1>
  3. Replace D12 with SS16 Schottky diode.

Suggest using SS16 as a replacement ( see AFC schematics, D2 of https://edms.cern.ch/ui/file/3060691/1/documentation_Schematic_Print_AFCv4.0.2_FMC-1.PDF )

oxfpete commented 2 weeks ago

point 1 - done

oxfpete commented 2 weeks ago

point 3 - done point 2 - not done yet

oxfpete commented 2 weeks ago

I am unable to view the cern link sadly, possible to send a screenshot by email? I will place a DNF link where I think it is meant to be to complete point 2 but I will not say this item is complete yet.

DavidCussans commented 6 days ago

Schematic looks good.