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GLAST LAT Project CDR/CD3 May 12-15, 2003
G. Haller 4.1.7 Elec LAT Design 1
Changes since PDRChanges since PDR
• Spacecraft Selection and Meetings:– PDU was moved to opposite side of
SIU to match SC power/C&DH physical partitioning
– Signal levels (discretes, 1 PPS, Science Interface, GBM GRB signal) were officially changed to LVDS (before undefined or RS422), March 03
– Recently finalized power, analog monitoring, and discrete interface to SC
– Defined MIL1553 command set/interface
– Separated SIU prime and redundant into separate (and identical) crate assemblies since cross-connection to SC prime and redundant was solved on the SC-LAT interface level and lead to removal of direct SIU-SIU inter-connections
Before SC selection
After SC selection
• COMMENT- Add Major to title & choose 1 chart
GLAST LAT Project CDR/CD3 May 12-15, 2003
G. Haller 4.1.7 Elec LAT Design 2
Changes since PDR (Con’t)Changes since PDR (Con’t)
• Event-Builder was moved from CPU crates to GAS unit
– Reduced complexity of inter-connections– Reduced hardware from 3 event-builder
blocks to 2 (1 prime, 1 redundant), and power dissipation from two event-builder blocks to one
• SIU crate was modified to be the same as EPU crate
– Removes mechanical, thermal, electrical design effort for one assembly
– Moved SC science interface from Spacecraft Interface Board in SIU to event-builder in GASU
– Additional benefit that SIB board is almost identical to existing SECCI version (both boards are designed by NRL/Silver Engineering), major simplification
– Science interface on GASU is small change since GASU already transmits event data to LAT CPU’s, so additional target is incremental
– Added SIB board in each EPU crate to provide local EEPROM
• Simplification in software effort. • No remote booting code
development/testing required.
SIU
EventBuilder
GlobalTrigger
CommandResponse
Unit
TEM 0
CAL
TKR
TEM 1
CAL
TKR
TEM 15
CAL
TKR
ACD
ACD
ACD
ACD ElectronicsModule
GAS Unit
EPU 0 EPU 1
SCCommanding
SC ScienceData
0 1 11
GLAST LAT Project CDR/CD3 May 12-15, 2003
G. Haller 4.1.7 Elec LAT Design 3
LAT Electronics PhysicalLAT Electronics Physical
16 Tower Electronics Modules– DAQ electronics module (DAQ-EM)– Power-supplies for tower electronics
* Primary & Secondary Units shown in one chassis
ACD
spare
EPU-3
EPU-2EPU-1
spare spare
Pwr Dist. Box
GASU
spare
spare
SIU-P SIU-R
3 Event-Processor Units (2+1 spare)
– Event processing CPU– LAT Communication Board– SIBSpacecraft Interface Unit
– Spacecraft Interface Board (SIB): Spacecraft interface for MIL1553 control & data
– LAT control CPU– LAT Communication
Board (LCB): LAT command and data interface
Power-Distribution Unit (PDU)*
– Spacecraft interface, power
– LAT power distribution
– LAT health monitoring
Global-Trigger/ACD-EM/Signal-Distribution Unit*
TKR
CAL
TKR Front-End Electronics (MCM)
ACD Front-End Electronics (FREE)
CAL Front-End Electronics (AFEE)
GLAST LAT Project CDR/CD3 May 12-15, 2003
G. Haller 4.1.7 Elec LAT Design 4
Optimization – SummaryOptimization – Summary
• Serial LVDS (Low-Voltage-Differential-Swing) protocol with Data, Clock, Reset, Return-Data to each front-end system and between DAQ modules (see LAT-TD-00606)
• Buffering of event data fragments at each module stage to meet dead-time requirements– TKR front-end -> TEM -> Event-Builder -> LAT
Communication Board -> CPU -> Spacecraft Solid-State Recorder
• Flow-control between buffer stages to meet non-overwriting and data consistency requirements
• Utilization of ASIC’s to meet volume, power, and cost constraints
• COMMENT- DELETE THIS PAGE
GLAST LAT Project CDR/CD3 May 12-15, 2003
G. Haller 4.1.7 Elec LAT Design 5
HeritageHeritage
• Similar data-acquisition system was used on balloon flight (TEM, one event-processing CPU, one spacecraft-interface-equivalent control CPU)
• Electronics components: mostly components with flight-heritage (FPGA’s, LVDS converters, memories)
• ASIC technology same as for tracker, calorimeter, ACD systems
• Trigger, dataflow, event assembly, and event filter processing very similar to past high-energy physics experiments
• COMMENT- DELETE THIS PAGE
GLAST LAT Project CDR/CD3 May 12-15, 2003
G. Haller 4.1.7 Elec LAT Design 6
LAT Spacecraft InterfaceLAT Spacecraft Interface
Power
SPACECRAFT
MIL1553
LAT
1 PPS
GBM GRBCandidate
DiscretesDigital
Analogs
Science Data
• Power
– 28V regulated and unregulated
• MIL1553
– Commanding
• Science Interface (LVDS)
– Transport of science data to spacecraft solid-state recorder
• 1-PPS timing signal (LVDS)
– Timing pulse
• GBM GRB Candidate signal (LVDS)
– Notification of candidate Gamma-Ray Burst (GRB), from GBM routed through SC
• Discretes (LVDS)
– Pulsed and level digital signals from and to spacecraft
• Analog Monitoring
– Temperature and voltage monitoring by SC without having LAT powered
• Two power/signal sets: Prime and redundant
• All agreed to: Spectrum Astro SC-LAT Interface Document
LVDS: Low-Voltage-Differential-Swing signaling
GLAST LAT Project CDR/CD3 May 12-15, 2003
G. Haller 4.1.7 Elec LAT Design 7
Power Interface to SpacecraftPower Interface to Spacecraft
toUnregulatedVoltagePrimary
to
to
to
GRID or Anti-Freeze
Heaters,several
zones, eachzone has itsown set of
thermostats/heaters
VCHPsurvival/
operationalheaters
RegulatedVCHP Voltage
Primary
Turn on control fromSIU P and SIU R
RegulatedVCHP Voltage
Redundant
Prime
Prime
Redundant
RegulatedSIU-Prime
Voltage
SIUPrime
Regulated SIU-Redundant
Voltage
SIURedundant
Regulated MainDAQ Prime
Voltage
PDUPrime
Regulated MainDAQ Redundant
Voltage
PDURedundant
Spacecraft LAT
To other thermostats/heater zones
toUnregulatedVoltagePrimary
to
to
to
Redundant
To other thermostats/heater zones
Turn on control fromSIU P and SIU Rl
Cross-connected:either PDU
can useeither feed
All switches arecontrolled by
spacecraft
Power to restof LAT
To other switches(12 total)
To other switches(12 total)
• All power feeds from spacecraft can be turned off/on via ground
• Spacecraft turns off SIU/DAQ feeds when going to survival mode
• LAT start-up ICD: LAT-TD-01536
– Describes process of cold and warm boot (bring-up) of LAT
GLAST LAT Project CDR/CD3 May 12-15, 2003
G. Haller 4.1.7 Elec LAT Design 8
Spacecraft 1-PPS and GRB Candidate SignalSpacecraft 1-PPS and GRB Candidate Signal
S1S2
D
C
ENB
Multiplexer
1-PPS P
1-PPS RS1S2
D
C
ENB
Multiplexer
GASU DAQ BoardRedundant
GASU DAQ Board Prime
S1S2
D
C
ENB
MultiplexerFan-Out
E.g SIU P
Spacecraft LAT
To other crates
• 1-PPS signal from spacecraft prime and redundant are connected to both GASU DAQ boards (prime and redundant)
• GASU DAQ selects which SC signal to use
• Result is fanned out to all processor crates (SIU’s as well as EPU’s)
• Crate DAQ selects which GASU signal to use
• SC-LAT components are fully cross-connected
• Same for GBM GRB candidate signal
GLAST LAT Project CDR/CD3 May 12-15, 2003
G. Haller 4.1.7 Elec LAT Design 9
Spacecraft Discrete SignalSpacecraft Discrete Signal
Discretes P
Discretes R
SIU Crate Redundant
SIU Crate Prime
CPU
Spacecraft LAT
• Discrete Signals from SC to LAT:– Discrete LVDS-signals from spacecraft prime and redundant are connected to
both SIU crates (prime and redundant)– Reset discrete: P and R SC signal is logically Or’ed and used as CPU reset– Spare discretes: CPU selects whether to use P or R input and result is routed to
CPU discrete inputs (3 prime and 3 redundant)• Discrete Signals from LAT to SC (not shown)
– Discrete LVDS-signals from LAT SIU P and SIU R are driven to both, prime and redundant, spacecraft C&DH (Control & Data Handling) systems
GLAST LAT Project CDR/CD3 May 12-15, 2003
G. Haller 4.1.7 Elec LAT Design 10
LAT-SC Science InterfaceLAT-SC Science Interface
• GASU event builder
– Directs data from TEM’s to any of the CPU’s (not shown)
– Directs data from CPU to CPU
– Directs data from CPU to spacecraft
• Any CPU can direct data via either GASU DAQ (P or R) to SC
• Data is driven to both SC sections (P and R)
– SC needs to select which GASU to listen to
– GASU needs to know from which SC (P or R) the flow-control line is valid
– All configured via ground commanding
Receiver P
Receiver R
GASU DAQ BoardRedundant
GASU DAQ Board Prime
Switch
SIU P
Spacecraft LAT
S1S2
D
C
ENB
Multiplexer
S1S2
D
C
ENB
Multiplexer
To other LAT CPU’s
To other LAT CPU’s
EPU R
2 SIU’s,3 EPU’s
GLAST LAT Project CDR/CD3 May 12-15, 2003
G. Haller 4.1.7 Elec LAT Design 11
Power Interface to SpacecraftPower Interface to Spacecraft
toUnregulatedVoltagePrimary
to
to
to
GRID or Anti-Freeze
Heaters,several
zones, eachzone has itsown set of
thermostats/heaters
VCHPsurvival/
operationalheaters
RegulatedVCHP Voltage
Primary
Turn on control fromSIU P and SIU R
RegulatedVCHP Voltage
Redundant
Prime
Prime
Redundant
RegulatedSIU-Prime
Voltage
SIUPrime
Regulated SIU-Redundant
Voltage
SIURedundant
Regulated MainDAQ Prime
Voltage
PDUPrime
Regulated MainDAQ Redundant
Voltage
PDURedundant
Spacecraft LAT
To other thermostats/heater zones
toUnregulatedVoltagePrimary
to
to
to
Redundant
To other thermostats/heater zones
Turn on control fromSIU P and SIU Rl
Cross-connected:either PDU
can useeither feed
All switches arecontrolled by
spacecraft
Power to restof LAT
To other switches(12 total)
To other switches(12 total)
• All power feeds from spacecraft can be turned off/on via ground
• Heaters are on separate power feeds
• Each SIU is powered via one dedicated SC power feed
• Rest of LAT power is on main feed
– One primary, one redundant
• Cross-connected in LAT PDU
– Can use either SC main feed to power either PDU
GLAST LAT Project CDR/CD3 May 12-15, 2003
G. Haller 4.1.7 Elec LAT Design 12
Power AllocationPower Allocation
Quantity Cold Current Current Hot Case
Case Estimate Allocation
Total 286.20 313.79 318.00 359.85
Mech On-Board Power 1 38.00 35.00 38.00 38.00
TEM--Tower Electronics Module 43.20 46.70 48.00 54.32
TEM board 16 2.70 2.92 3.00 3.39
Power Supplies 148.50 163.29 165.00 186.72
TKR,CAL,TEM 16 9.28 10.21 11.67
GASU--Global Tgr ACD, Signal Dist. Unit 19.80 22.37 22.00 24.90
EP, AEM, Sig Dist & Supplies 1 22.37
Other Boxes 74.70 81.43 83.00 93.92
SIU--Spacecraft Interface Unit 1 21.60 23.89 24.00 27.16
EPU Total 38.70 42.60 43.00 48.66
EPU--Event Processor Unit 2 19.35 21.30 21.50 24.33
PDU--Power Distribution Unit 1 14.40 14.93 16.00 18.11
GLAST LAT Project CDR/CD3 May 12-15, 2003
G. Haller 4.1.7 Elec LAT Design 13
Grounding & ShieldingGrounding & Shielding
FILTER FILTER
TKR/CAL_FE
ACD_FEFILTER
ACD ASSY
FILTER
TEM ASSY.
EPU
FILTER
FILTER
FILTER
POWER ASSY.
DIST-GLT ASSY. SPACECRAFT
T
28 VOLTS
MIL-1553
SSR
HSKP
GRID COMMON
SPACECRAFT
SUBSYSTEM
GROUND
COMMON
SIU
FILTER
BONDINGSTRAP
( ONE PLACE )
FILTERFILTER
OUTER SHIELDGRID CABLE
LAT RF SHIELD
BOX ENCLOSURE
GLAST LAT Project CDR/CD3 May 12-15, 2003
G. Haller 4.1.7 Elec LAT Design 14
EMI/ EMC & EMI AllocationEMI/ EMC & EMI Allocation
• Primary document 433-RQMT-005• Radiated Emissions (RE101, RE102)
– 20% of total emissions are allocated to subsystems outside LAT RF shield
• ACD, Tracker, Heaters– 60% of total emissions are allocated to subsystems inside
LAT shield• Radiated Susceptibility (RS101,RS103)
– All subsystems must meet Section 5.3 of 433-RQMT-005• Conducted Emissions (CE101, CECM)
– Only the T&DF subsystem is affected and must meet requirements
• Conducted Susceptibility (CS101, CS116)– Only the T&DF subsystem is affected and must meet
requirements
• COMMENT- Radiation Hardness?
GLAST LAT Project CDR/CD3 May 12-15, 2003
G. Haller 4.1.7 Elec LAT Design 15
Connections LAT/Spacecraft and to LAT EMI Connections LAT/Spacecraft and to LAT EMI Shield (focus)Shield (focus)
GLAST LAT Project CDR/CD3 May 12-15, 2003
G. Haller 4.1.7 Elec LAT Design 16
Example: Connections LAT/Spacecraft and to Example: Connections LAT/Spacecraft and to LAT EMI ShieldLAT EMI Shield
+Y
Ra
dia
tor
Bra
cke
t-Y
Ra
dia
tor
Bra
cke
t
ACDElectronics
Box(x 24)
SIURdnt
SIUPrim
PDUBox
SC PRUPrim2.8A
regulated
+Y HeaterControl Box
JL-126
-Y HeaterControl Box
JL-139
SC PRURdnt2.8 A
regulated
JL-1
13
JL-1
12
JL-146
SC PDUPrim
unregulated
SC PDURdnt
unregulated
12 c + 6 gnd
12 c + 6 gnd
12 c + 6 gnd
12 c + 6 gnd
JL-1
07
JL-3
JL-4
JL-1
JL-2
4 pr tm +4 pr vm
JL-34
4 pr pwr +4 pr vm
4 pr pwr +4 pr vm
4 pr pwr
4 pr pwr
JL-141
6 -Y VCHP Heater Rdnt
6 -Y VCHP Heater Prim2 -Y Rad Antifreeze Heater Prim
2 -Y Grid Make Up Heater Rdnt
2 -Y Grid Make Up Heater Prim
2 -Y Rad Antifreeze Heater RdntJL-143
JL-147
JL-150
4 pr pwr
4 pr pwr
4 pr pwr
12 pr pwr
4 pr pwr
4 pr pwr
4 pr pwr12 pr pwr
48 pr tm
Grid (12 tm)Cal baseplate (16 tm)
JL-105 JL-37
JL-106
JL-149
2 pr pwr (AWG18)
2 pr pwr (AWG18)
2 pr pwr (AWG18)
JL-33JL-31
4 pr pwr
4 pr pwr
2 pr vm
2 pr tm
1 pr mil1553
1 pr mil1553
12 pr discrete
12 pr discrete
1 pr mil1553
1 pr mil1553
12 pr discrete
12 pr discrete
SCC&DHPrim
SCC&DHRdnt
SC AnalogMonitor Rdnt
SC AnalogMonitor Prim
4 pr pwr
4 pr pwr
12 pr pwr
12 pr pwr
XLAT plateJL
-12
3
JL-142
JL-140
JL-144
[ FROM ACD TO SC ]ACD Tiles (10 tm)ACD PMT Rail (8 tm)ACD Shell (10 tm)
2 pr pwr + 2 pr vm (-Y VCHP, sum of 6 Prim sw & sum of 6 Rdnt sw)
2 pr pwr + 2 pr vm (-Y VCHP, sum of 6 Prim sw & sum of 6 Rdnt sw)
2 pr pwr + 2 pr vm (+Y VCHP, sum of 6 Prim sw & sum of 6 Rdnt sw)
2 pr pwr + 2 pr vm (+Y VCHP, sum of 6 Prim sw & sum of 6 Rdnt sw)
4 pr tm
4 pr tm
32 pr tm
16 pr tm
16 pr tm
32 pr tm
16 pr tm
16 pr tm
2 pr pwr (AWG18)
-Y VCHP-XLHP Intf (4 tm)
Grid (12 tm)Cal baseplate (16 tm)
Timing Prim/Rdnt
GRBM Prim/Rdnt
JL-1
10
JL-1
09
GASUBox
JL-5
JL-7
JL-8
JL-4
4JL
-45
JL-4
1JL
-40 16 pr LATP +
8 pr pwr +2 pr tm + 2 pr vm
16 pr LATP +8 pr pwr +
2 pr tm + 2 pr vm
-Y VCHP Heaters (24 tm)-Y VCHP-XLHP Intf (12 tm)-Y VCHP-DSHP Intf (12 tm)
48 pr tm
SC PRUPrim25A
regulated
SC PRURdnt25A
regulated
16 pr pwr
16 pr pwr
4 pr tm + 4 pr vm
4 pr tm + 4 pr vm
(2 pr tm + 2 pr vm, pdu Prim & rdnt) + (2 pr tm + 2 pr vm, gasu Prim & rdnt)
(2 pr tm + 2 pr vm, pdu Prim & rdnt) + (2 pr tm + 2 pr vm, gasu Prim & rdnt)
16 pr pwr
4 pr tm +4 pr vm
16 pr pwr
4 pr vm
4 pr vm
28 pr tm
28 pr tm
JL-9,10,11
JL-13 … 28
JL-6
JL-1
08
8 pr tm
(8 c)*2 + 8 gnd
(8 c)*2 + 8 gnd
EPUBox(x 3)
TEMBox
(x 16)
JL-7
0,7
1,7
2
x 3
4 pr pwr + 2 pr tm + 2 pr vm
x 16
JL-8
9-1
04
4 pr pwr + 4 pr tm + 2 pr vm
JL-6
6,6
7,6
8
JL-46,47,48
JL-50 … 65
JL-7
3-8
8
x 3
x 16
100
51
JL-1
17
JL-230
JL-1
16
JL-1
19
JL-232
JL-1
22
JL-1
20
100
100
EPUBox
(test only)JL-1
55
JL-1
54
6 +Y VCHP Heater Rdnt
6 +Y VCHP Heater Prim
+Y Grid Rad Intf (4 tm)2 +Y Grid Make Up Heater (4 tm)+Y Radiator (8 tm)
[ FROM ACD TO PDU ]ACD BEA-Grid Intf (4 tm)ACD PMT Rail (8 tm)ACD Shell (4 tm)
Grid Rad Intf (8 tm)Radiator (20 tm)Radiator Antifreeze Heaters (8 tm)
JL-12
4 pr pwr +2 pr tm +2 pr vm
JL-49
100JL-29
JL-43JL-42
22 pr science +2 pr 1PPS +2 pr GRBM 22 pr science +
2 pr 1PPS +2 pr GRBM
JL-125
2 pr 1PPS +2 pr GRBM
2 pr 1PPS +2 pr GRBM
JL-1
24
11 pr science
11 pr science
11 pr science
11 pr science
NOTE: ONLY FIXED POSITION CONNECTORS ARESHOWN. CABLE CONNECTORS ARE NOT SHOWN.SC CONNECTORS NOT SHOWN. ACD NOT SHOWN.
JL-1
11
JL-1
14
JL-130
JL-131
JL-127
JL-129
JL-137JL-136
JL-134JL-133
2 +Y Rad Antifreeze Heater Prim
2 +Y Rad Antifreeze Heater Rdnt
2 +Y Grid Make Up Heater Prim
32 pr tm
JL-128
2 +Y Grid Make Up Heater Rdnt
AC
D T
em
pS
en
sor
Bra
cke
t
+Y VCHP Heaters (24 tm)+Y VCHP-XLHP Intf (12 tm)+Y VCHP-DSHP Intf (12 tm)
JL-69 JL-39 JL-35
16 pr tm
28 pr tm
JL-38
JL-32JL-30
JL-36
36 pr tm
-Y Grid Rad Intf (4 tm)2 -Y Grid Make Up Heater (4 tm)-Y Radiator (8 tm)
32 pr tm
14 prtm
14 prtm
JL-228
JL-1
21
JL-1
18
JL-234
JL-156 … 179
??
JL-180 … 203
x 24
GLAST LAT WIRINGDIAGRAM
REV 06
FEB 27, 2003 PY
JL-153
JL-2
04
… 2
27
8 pr tm + 40 pr vm
4 pr tm +20 pr vm
SPAREANALOGS
4 pr tm +20 pr vm
2 pr vm
2 pr vm 2 pr vm
2 pr vm
vm
vm
vm
vm
1 pr im
1 pr im
1 pr im
1 pr im
JL-1
15
2 pr tm
2 pr vm
JL-229JL-233
JL-235 JL-231
6 -Y VCHP Heater (12 tm)
6 +Y VCHP Heater (12 tm)+Y VCHP-XLHP Intf (4 tm)
JL-?
JL-151JL-148JL-145
JL-138JL-135JL-132
NOT USED CONNECTORNUMBERS
KEY:pr pairc controlgnd groundpwr powervm voltage monitorim current monitortm temp monitor
emi shieldspacecraftlocated +X sidelocated -X sidelocated +Y sidelocated -Y side
HDS high density D socketHDP high density D plugUDS micro D socketUDP micro D plugCIRC1S circular series I socketCIRC1P circular series I plugCIRC2S circular series II socketCIRC2P circular series II plug
JL-152
Reference TypeJL-1 55-CIRC1PJL-2 55-CIRC1PJL-3 55-CIRC1PJL-4 55-CIRC1PJL-5 26-HDPJL-6 26-HDPJL-7 78-HDSJL-8 78-HDSJL-9...12 26-HDSJL-13…28 26-HDSJL-29 37-UDSJL-30 100-UDSJL-31 100-UDSJL-32 100-UDSJL-33 100-UDSJL-34 100-UDSJL-35 37-CIRC2?JL-36 79-CIRC1SJL-37 100-CIRC1SJL-38 100-CIRC1SJL-39 26-HDSJL-40 78-HDPJL-41 78-HDPJL-42 62-HDSJL-43 62-HDSJL-44 100-UDSJL-45 100-UDSJL-46…49 100-UDSJL-50…65 51-UDPJL-66…68 100-UDPJL-69 100-UDSJL-70…72 26-HDPJL-73…88 51-UDPJL-89…104 26-HDPJL-105JL-106JL-107 26-HDSJL-108 26-HDSJL-109 100-UDSJL-110 100-UDSJL-111…114 26-HDPJL-115 13-CIRC1PJL-116 13-CIRC1PJL-117 66-CIRC1PJL-118 66-CIRC1PJL-119 13-CIRC1PJL-120 13-CIRC1PJL-121 66-CIRC1PJL-122 66-CIRC1PJL-123 22-CIRC1PJL-124 66-CIRC1SJL-125 66-CIRC1SJL-126JL-127JL-128JL-129JL-130JL-131JL-132 NOT USEDJL-133JL-134JL-135 NOT USEDJL-136JL-137JL-138 NOT USEDJL-139JL-140JL-141JL-142JL-143JL-144JL-145 NOT USEDJL-146JL-147JL-148 NOT USEDJL-149JL-150JL-151 NOT USEDJL-152 66-CIRC2?JL-153 51-UDPJL-154 26-HDPJL-155 100-UDPJL-156…179 100-UDPJL-180…203 79-CIRC2?JL-204…227 79-CIRC2?JL-228…235 MIL1553
GLAST LAT Project CDR/CD3 May 12-15, 2003
G. Haller 4.1.7 Elec LAT Design 17
SHIELDINGSHIELDING
GLAST LAT Project CDR/CD3 May 12-15, 2003
G. Haller 4.1.7 Elec LAT Design 18
Monitoring & Thermal Control OutlineMonitoring & Thermal Control Outline
• Overview• Temperature Monitoring (Matrix)• Voltage/Current Monitoring (Matrix)• Operating Temperature Control• Survival• Summary
GLAST LAT Project CDR/CD3 May 12-15, 2003
G. Haller 4.1.7 Elec LAT Design 19
MonitoringMonitoring
ACD
ACD
0 11
EPUP0
EPUR
SIUR
SIUP
TEM 0
CAL
TKR
TEM15
CAL
TKR
MonitoringP
PDU
Via CommunicationProtocolVia Sensor Wires
V/T toSC P/R
GASU
V/T toSC P/R
V/T toSC P/R
MonitoringR
V/T toSC P/R
Sensors Pexternal ofLAT EMIshield
Sensors Pexternal ofLAT EMIshield
T toSC P
T toSC R
V/T toSC P/R
• Spacecraft monitors – Voltages & Temperatures
• PDU• SIU• GASU• VCHP switches
– Temperatures• Locations outside LAT EMI shield
• PDU monitors– Voltages & Temperatures
• TEM• EPU• SIU
– Temperatures• Locations outside LAT EMI shield
• GASU monitors– Voltages & Temperatures
• ACD• TEM monitors
– Voltages & Temperatures• CAL• TKR
GLAST LAT Project CDR/CD3 May 12-15, 2003
G. Haller 4.1.7 Elec LAT Design 20
Temperature Monitoring (SC & PDU)Temperature Monitoring (SC & PDU)Name Type Spacecraft PDU
Prime Redundant PrimeRedundan
t
ACD Tiles Thermal 5 5
ACD TSA Shell (inside) Thermal 5 5
ACD TSA Shell (outside) Thermal 2 2
ACD BEA-Grid interface Thermal 2 2
ACD PMT Rail Thermal 4 4 4 4
Calorimeter Baseplate Thermal 16 16
SIU Thermal 2 2
PDU Thermal 2 2
EPU Thermal 3 3
GASU Thermal 2 2
TEM DAQ Board Thermal 16 16
TEM pwr Supply Thermal 16 16
Radiator Anti-Freeze Htr Thermal 4 4
Radiators Thermal 8 8 10 10
Grid-Radiator interface Thermal 4 4 4 4
Grid Make-up Heaters Thermal 4 4
VCHP-XLHP interface Thermal 4 4 12 12
X-LAT Plate Thermal 4 4
VCHP-DSHP interface Thermal 12 12
Grid Thermal 12 12
VCHP's Reservoir Htr Thermal 12 12 24 24
VCHP Reservoir Htr Pri/Sec Voltage 4 4
Spare Temp. Channels Thermal 8 8
GLAST LAT Project CDR/CD3 May 12-15, 2003
G. Haller 4.1.7 Elec LAT Design 21
Temperature Monitoring (TEM & GASU)Temperature Monitoring (TEM & GASU)
Name Type TEM GASU
Prime Redundant
ACD FREE Thermal 12 12
CAL AFEE Thermal 128
AEM Power Supply Thermal 1 1
AEM DAQ Board Thermal 1 1
TKR Cables Thermal 256
• LAT Instrumentation Plan: LAT-SS-00890• Spacecraft ICD: GSFC-IRD-433
GLAST LAT Project CDR/CD3 May 12-15, 2003
G. Haller 4.1.7 Elec LAT Design 22
Voltage/Current MonitoringVoltage/Current Monitoring
Name Type Spacecraft PDU TEM GASU
Prime Redundant Prime Redundant
VCHP Reservoir Htr Pri/Sec Voltage 4 4
SIU Pri/Sec 3.3/5V V Voltage 2 2
PDU Pri/Sec 3.3V V Voltage 2 2
GASU Pri/Sec 3.3/28V/3.3VA V Voltage 2 2 6 6
EPU 3.3V V Voltage 4 4
TEM 3.3V V Voltage 16 16
ACD FREE V Voltage 12 12
ACD FREE I Current 1 1
ACD HV (I) Current 24 24
TKR V Voltage 64
TKR I Current 64
CAL V Voltage 48
CAL I Current 48
TEM DAQ V Voltage 16
TEM DAQ I Current 16
LAT SIU Bus V Pri/Sec Voltage 2 2
LAT VCHP Bus V Pri/Sec Voltage 2 2
Spare Voltage Channels Voltage 18 18
Total 32 32 20 20 256 43 43
GLAST LAT Project CDR/CD3 May 12-15, 2003
G. Haller 4.1.7 Elec LAT Design 23
Heater ControlHeater Control
ThermostatGRID/VCHPAnti-
FreezeHeaters
SpacecraftPower
MOS FET
VCHPHeaters
SpacecraftPower
SIU
• Survival Heaters (GRID & VCHP Anti-Freeze) – Powered by SC unregulated feed– Block redundant prime and redundant
set– Thermostat control, not controlled by
LAT electronics• Survival & Operational Heaters (VCHP)
– Powered by SC regulated feed– Block redundant prime and redundant
set of 12 heaters– Controlled by LAT SIU
• Temperature monitoring• Software algorithm in CPU• 12 hardware switches in SIB• Hardware watchdog to power
heaters as default– Final responsibility of survival is by SC
• LAT-SS-00715 Thermal Control System ICD
GLAST LAT Project CDR/CD3 May 12-15, 2003
G. Haller 4.1.7 Elec LAT Design 24
Instrument ProtectionInstrument Protection
• Instrument Damage Protection Against LAT Hardware & Software Malfunction– Protection against high and low temperatures– Protection of ACD Photo-Multiplier Tubes (PMT’s) in South-
Atlantic Anomaly (SAA)– Document: LAT-TD-01553
GLAST LAT Project CDR/CD3 May 12-15, 2003
G. Haller 4.1.7 Elec LAT Design 25
High and Low TemperaturesHigh and Low Temperatures
• GRID/Anti-freeze heaters – turn on when T is below
thermostats– no LAT active control
• VCHP heaters– LAT responsible for
operational control • Survival
– if T too high or too low• SC puts LAT into safe
mode• Turns-off LAT SIU
and Main DAQ power
SC: TDRSSWarning to
Ground
Yellow HighLimit
SC: TurnsLAT SIU/
DAQ Poweroff
Red HighLimit
LAT off or LATprocessor stuck
Within T limits
LAT SIU controls VCHPheater switches
VCHP Heaterspowered, Radiators
isolated
LAT on, LAT processoroperating, Thermal
Control enabled
Within T limits
LAT-LATTemp sensors
SC: Processing of Temperatures, monitoring of Heater Feeds
LAT-SC Tempsensors
Radiators not isolated(Malfunction of SIU/
heaters/SC feed)
Red Low Limit
SC: TDRSSWarning to
Ground
Yellow Lowlimit
T out of limits
SC: TurnsLAT SIU/
DAQ Poweroff
GLAST LAT Project CDR/CD3 May 12-15, 2003
G. Haller 4.1.7 Elec LAT Design 26
ACD PMT ProtectionACD PMT Protection
• LAT turns down PMT high-voltage levels during SAA passage to protect PMT’s
– SC SAA notification• PMT’s are hardware protected within ACD in case of DAQ mishap
– ACD HV supplies have built-in protection to limit current to PMT’s
ACD high-voltagesupplies limit current
LAT power on,processor mal-function
ACD PMT high-voltagelowered
LAT on, LAT processoroperating, LAT
commanding enabled
Within currentlimit
SC SAAindicationcommands
At current limit
LAT power off
SAA
No high-voltage
SAA
GLAST LAT Project CDR/CD3 May 12-15, 2003
G. Haller 4.1.7 Elec LAT Design 27
SummarySummary
• Monitoring of temperatures, voltages, and currents defined• Heater control defined• Instrument protection tree documented
– LAT DAQ does not have final responsibility to protect instrument from damage
• Responsibility of spacecraft
GLAST LAT Project CDR/CD3 May 12-15, 2003
G. Haller 4.1.7 Elec LAT Design 28
Tracker ElectronicsTracker Electronics
• TKR sub-system electronics • Si-Strip Detectors• 24 GTFE (GLAST Tracker Front-End) ASIC (1,536 signal channels)• 2 GTRC (GLAST Tracker Readout Controller) ASIC• MCM (Multi-Chip Module) • Flex-cables
• Presented in tracker sub-system CDR
GTFE ASIC
GTRC ASIC
GLAST LAT Project CDR/CD3 May 12-15, 2003
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Calorimeter ElectronicsCalorimeter Electronics
• CAL sub-system electronics• Diodes• 48 GCFE (GLAST Calorimeter Front-End) ASIC• 4 GCRC (GLAST Calorimeter Readout Controller) ASIC• AFEE (Analog Front-End Electronics) board
• Presented in calorimeter sub-system CDR
GCFE ASIC
GCRC ASIC
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G. Haller 4.1.7 Elec LAT Design 30
ACD ElectronicsACD Electronics
• ACD sub-system electronics• PMT’s• 18 GAFE (GLAST ACD Front-End) ASIC• 1 GARC (GLAST ACD Readout Controller) ASIC• FREE (Front-End Electronics) board• High-Voltage Supply board (not shown)
• Presented in ACD sub-system CDR
GAFE ASIC GARC ASIC