Transcript CELeSTA_UpdateApril2015x

CELeSTA Project Update
April 2015
Raffaello Secondo
HW Updates - ADC
 Corrections to the current PCB, (5V supply to temperature sensor, Brilliance Ground
connection.
 ADC MAX11046 SHDN pin: if enabled 38 mA reduction on the
ADC supply (38mA ·5V ≈ 190 mW).
 Perform a test with the TestBoard v2 and a test at
CHARM/PSI to see irradiation with shutdown pin OFF and
ADC enabled every hour.
HW Updates - Opamps

OPA2227 Dual
OPAMP Shows no
offset in Lab. Pins 6
and 7 are not
saturated.

To be replaced with
OPA227. Gain 6mA
current reduction (41
mW). (spice sim)

Include switching
ON/OFF every hour
(including the RTD for
temperature
compensation).
Current switch on the
RTD
HW Updates – SEL detection


SEL circuit. Voltage comparator: LMx39: 0.8 mA supply current. Date code variability.

[1]: LM139. withstand up to 500 Gy with RL = 5k. Starts degrading at 200 Gy. Tested with + 5V/ 0. Temp range: -55 to 125 C

[2]: LM339D out of specification worst case at 156 Gy. Tested with +/- 15V. Temp range: 0 to 70 C
Other candidates? (LM111). Current Limiter to ≈ 18 mA? (Resistance in series, LM317).  Try on a custom PCB
Current sense
Latchup Detection
[1]: Analysis of Total-Dose Response of a Bipolar Voltage Comparator Combining Radiation Experiments and Design Data. L. Dusseau et al. UM, CNES. IEEE Transactions
ON NUCLEAR SCIENCE, Vol 53, NO 4. 2006
[2]: CERN Radiation Test Report 1219830. G. Spiezia et al. 2011
HW Updates - COM
 CHARM/PSI tests on candidate components:
 SN65HVD234:
Vcc 3.3V
Icc 6mA.
Temp: -40 to 125.
Low current sleep stand-by mode




Ask Montpellier for current components on ROBUSTA?
CAN controllers for space (AT7908E) ?
Rad Hard Bus transceivers: HXBUSX18 ?
Other candidates?
HW Updates - COM
 Could use a RS422 circuit combined with a CAN Controller [3]
[3]: Integration of a CAN Bus in an Onboard Computer for Space Applications. Stijn Wielandt et. Al. DraMCo research Group, Catholic University
College Ghent, Association KULeuven, Belgium. 11th Int. Conf. on Development and Application System, Romania, 2012.
Sensors
 Memories:
- Testing the Brilliance with the LatMon at PSI ?
 Burst issue: Cypress 65 nm -> Luigi Dilillo ?
 RadFet:
- RadFet Temperature characterization in the full temperature range
Work Plan 2015
Raffaello
• Radfet Temperature Characterization
(F. Ravotti)
• Development and CHARM test on a second
Payload test board monitoring Supply
Voltages and Currents with Labview
Anne Sophie
• Finalize Data Analysis and comparison with
data provided by Natanael
• Mission status ? (Mezzanine Board, Supply
Voltages, constraints etc…)
• CAN transceiver tests and Reading Software.
• ADC test with SHDN pin
• LatMon development and Tests on Memories
(Brilliance/Samsung)
• Test support and data analysis.
• RadFet Temperature characterization,
analysis and support.