INFICON Spot CDS550D - Manual (Page 2)

Research & Development
SPOT CDS500D & CDS550D OEM Sensor SPI-Interface Specification_V1.1 Page 2 of 14
Christian Berg, T based on Felix Mullis, TL Created 11/10/2014 2:36:00 PM
1 Table of Contents
1 Table of Contents ............................................................................................................. 2
2 Hardware Concept ............................................................................................................ 3
2.1 Hardware Block Diagram ............................................................................................................... 3
2.2 Interface Connector and Cable ...................................................................................................... 4
2.3 Grounding Concept ........................................................................................................................ 4
2.4 Timing Specifications ..................................................................................................................... 4
2.5 Interface Hardware Specifications ................................................................................................. 5
2.5.1 Power Supply .......................................................................................................................... 5
2.5.2 Recommended operating conditions....................................................................................... 5
2.5.3 SPI Interface ............................................................................................................................ 6
3 Read Results ..................................................................................................................... 7
3.1 Pressure ......................................................................................................................................... 7
3.2 Temperature .................................................................................................................................. 8
3.3 Status and Error ............................................................................................................................. 9
3.4 Power-up reset ............................................................................................................................... 9
4 History ............................................................................................................................... 9
5 Appendix ..........................................................................................................................10
5.1 Grounding Concepts .................................................................................................................... 10
5.2 SPI Timing ................................................................................................................................... 11
5.2.1 Introduction ............................................................................................................................ 11
5.2.2 Timing .................................................................................................................................... 11
5.2.3 Total Measurement Cycle ..................................................................................................... 12
5.2.4 Ready-signal ......................................................................................................................... 12
5.2.5 Single Measurement Cycle ................................................................................................... 13
5.2.6 Readout Time Window .......................................................................................................... 13
5.2.7 Conclusion ............................................................................................................................. 14
5.2.8 FAQ’s, Comments ................................................................................................................. 14