A'Lebedev MIT

1
A.LebedevMIT

• DALLAS
• TEMPERATURE SENSORS
• in AMS-2
• AMS SubD Meeting at CERN, Geneva, February 2005

2
Interface to USCM
3
Tests Made by Shixiong Fang
4
Results

• The maximum number of sensors on one bus136 in
  case B length13.3m
• Voltage drop and rise time increase when connect
  more sensors or increase
• cable length, (generally voltage drop 0.4v
  when connect 32sensors to bus)
• As to the topology, linear is priority

5
Typical Waveforms
32sesors,3m Voltage 4.8v
136sensors, 13.3m Voltage 3.7v
6
New USCM Software (HBB)

• The set of USCM commands is now almost as good as
  in AMS-1
• Up to 64 Dallas sensors per each of 8 busses
  (well, only 64 x 6 sensors tested)
• USCM may (should) be used to read Dallas sensor
  IDs
• New software may be given out to trusted users
  now
• Dogmatics, please wait, when it will be
  completely finished and fully tested (in about a
  month)

7
Global Temperature Network

• Dallas busses are connected to USCMs in JPD
• There are also some PT1000 sensors read by TTCS
• Measures temperatures before subdetector
  electronics power startup
• AK and SF will make a prototype
• PCB with SMD Dallas sensors (design and
  production)
• Cable design
• Cable routing on the AMS-2 mockup
• Electrical tests
• Everybody study the next diagram and speakout
• Suggestions, as always, are welcome

8
Global Temperature Sensor Net
AST STAR
AST PORT
CC 3
CC 1
MAIN RAM RADIATOR
MAIN WAKE RADIATOR

LAS
CC 0
CC 2
P D S
A
B
RICH ECAL
RICH ECAL
DALLAS (64 shown)

9
Local Temperature Networks

• These are connected to USCMs in
• CCEB
• UG-Crate
• M-Crate
• Remider TTCS will not read non-TT Dallas sensors
• Too few USCMs coordination is required (see
  next slide)
• How signals arrive in USCM (FP/BP)?
• USCM modification needed? (remove some parts, add
  mezzanine board)?
• Nonstandard USCM front panel design?
• Modified USCM space qualification?

10
Local Temperature Networks