FIELDBUS : WorldFIP RadHard Developments

Julien PALLUEL BE/CO/FE Radiation To Electronics ‘1st Combined Workshop & School-Days’ June 2nd/ 3rd 2009 1

Julien Palluel BE/CO/FE


WorldFIP Description and principleLHC problematic

RadHard SolutionsProtection systemsRe-initialisation systemsChoice of components

Radiation tests : repeater Co/Co exampleGammas radiationsProtons tests


DescriptionMaximum length of wiring

○ 8000m with a speed of 31.25Kb/s○ 1000m with a speed of 1Mb/s○ 500m with a speed of 2.5Mb/s

300 km of WorldFIP fieldbus

Consequences Repeaters RadHardDiagnostic Agent Rad-Hard (FIPDiag)


LHC problematicAll elements must be RadHard

○ Protection against latch-up○ Protection against single event○ Lifetime under radiation : >200 Gy

Components high life○ Durability of the radiation tested cards


Protection against latch-upPowercycle System

Example : Repeater RadHard Protection system : cut the power line with a MOS

power for 1 second after the detection of an

overcurrent (ex threshold 4xInom)


Principle of protection against latch-up:

Schema of protection against latch-up:


Protection against latch-up Component reference

○ Cut-off element : MOS-FET OD 22-16V ○ Current measure : LMV 393 ○ Cut-off timer : CMOS 74HC4538


Protection against Single Event module Re-initialisation

Example : Repeater RadHard

Protection system : inactivity of one of the two mediums, detected by the component FIELDRIVE generates a reset signal which is processed by an integrated function in the FPGA.


Protection against Single Event Up-set:Corruption of memory (address, configuration…)

Example : FIPDiag module

re-initialisation of the software by a remote reset triggered by a specific message (255 characters)


Lifetime under radiation selection of components not sensitive to

radiation …)

Example : Galvanic isolation provided by the

transformer in place of optocoupler Repeater RadHard A 5V supply is obtained from 230V sector.

The regulation is linear (type regulator Balasta) with transformer and diode bridge.


Principle of power supply:

Schema of power supply :


Lifetime under radiation selection of components not sensitive to radiationExample : Repeater RadHard

Repetition process embedded in a type ACTEL FPGA anti-Fuse resistant to radiation (Ref : Actel eX128 TQ100)

CMOS components

WorldFIP technology tested in 1998 (FIELDRIVE)


Lifetime under radiationRepeater RadHard WorldFIP technology tested

in 1998 (TCC2, mixed fields) Référence composant :

○ SSSB222 FIELDRIVE 0421A○ FIELDTRx.S JMF 9539 04/47

Currently these two components have evolved to a new technology that seems to be more sensitive to radiation.

Tests are planned at CNGS

!


Components turnover Period of production too shortSolution Use virtual device defined in VHDL and

integrated in FPGA already testedExample : In-sourcing WorldFIP technology

○ Purchase technology WorldFIP VHDL ○ Adaptation to CERN needs○ Realisation

Project under the responsibility of Javier Serrano’s team



General architecture of the card :


Gammas radiations tests at Pagure’s CEA, Saclay

Conditions of irradiation○ Cobalt-60 source○ Total Irradiation of the card (active part)○ Dose and period:

1h30 at 20Gy/h (2.60m from the source)5h at 60Gy/h (1.51m from the source)

○ FIP Speed : 1MB/s.○ MacroCycle period : 100ms○ Variables : 2 (1xRead + 1xWrite on FIPDIAG)


Gammas radiations tests at Pagure’s CEA, SaclayResults :

○ 1) 20Gy/h irradiationNo functionnal fault (Up-set, Latch-up and Reset) The overall current of the module remained constant at 147mA Test of the anti-latch-up was working well

○ 2) 60Gy/h irradiationNo functionnal fault (Up-set, Latch-up and Reset) until 310Gy up where the module has stopped working.

Remarks :○ The overall current of the module has increased from 147mA to 152mA, then

147mA just before stop working. ○ We have made some power reset until the end of this test. The repeater

stayed silent ○ Once testing is completed, after 5 minutes of rest, the module was working

normally. Possible reason : the supply current has drained the trapped charges in MOS thresholds and allowed them to re-operate properly.In the LHC where the modules will experience a much lower fluence, it should therefore not have any operational defect related to gamma radiation.


Protons tests at Louvain,Belgium

Conditions of irradiation○ Proton beam 62 Mev○ Flux between 5x10exp7 and 5x10exp8 P/cm2/s○ Total Irradiation of the card (active part)○ Speed : 2.5MB/s○ MacroCycle period : 20ms○ Variables : 2 (1xRead + 1xWrite on FIPDIAG)



Protons tests at Louvain,BelgiumResults

○ 235gy (1 Up-Set seen) on first repeater○ 512gy (2 Up-Sets seen) on second repeater

before first faults○ Overall current mainly constant○ Test of the anti-latch-up was working well


Main repository www.cern.ch/cern-worldfip

Repeater Rad Hardwww.cern.ch/cern-worldfip/Docs/CERN

Presentations/Radiation Hard Repeater-ENG.pdfhttp://documents.cern.ch//archive/electronic/cern/others/ab/ab-

note-2005-039.pdfwww.cern.ch/cern-worldfip/Docs/Hardware Modules/Repeater

CU-CU Radiation Hard/Manuel Repeteur Cu_Cu-FR.pdf

FIPDiagwww.cern.ch/cern-worldfip/Docs/CERN Presentations/Fipdiag

and FipADUC Modules-ENG.pdf

Radiation Répéteur FPGA Proton Gamma WorldFIP Latch-up Upset Dose

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FIELDBUS : WorldFIP RadHard Developments

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