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| SENT TRAINING MODULES | ||
| Topics | Contents | |
|---|---|---|
| 1 | Rationale for the protocol. Overview of the specification. Physical layer. Fundamental Encoding Principle into Nibbles. Ticktime and how it relates to the Nibble Value. | The SENT Protocol |
| 2 | What are the Fast Channels? Encoding of physical values such as temperature, pression, differential pressure, torque, angle. Combination of several values into the payload. Auxiliary values for safety sensors. For these labs we will use the LAH10x SENT signal sources. Details can be found here: http://www.lahniss.com/_ulah10x/lah10x.shtml . | Fast Channels |
| 3 | Constitution of the Status and Control Nibble. Function of every bit in the Control Nibble. Variations over 16 and 18 messages. Synchronisation method. Contents of the Slow Channels. Distribution of information over time. Manufacturers interpretation of the specification. User controlled interpretation of the Slow Channel messages (SCDF file, its syntax and usage). Advantages of the Slow Channels versus other buses (CAN,LIN). This work will require other sensors, such as Hella and Micronas, with a variety of Slow Channel Messages. More information can be found under: http://www.lahniss.com/_psent/SENT.shtml . | Status and Control Nibbles - Slow Channel encoding. |
| 4 | Discussion of the SENT infrastructure versus the SENT payload. Invariance of infrastructure across applications. Variations of Payload across applications. Consequences on usage of tools for interpretation. | Infrastructure versus Payload |
| 5 | Observing a Fast Channel value over time. It is often required to monitor sensors over long periods of time, during test phase or for certification purpose. These tests can be conducted in ovens, cooling chambers or EMC enclosures and require a tight monitoring of the sensor output under various climatic and/or electromagentic conditions. Several methods are exposed and discussed. Visual Method in table. Method using export of Decode Table. Method using ProtobusMag. Saving values over a long period of time. Remote monitoring (developed also in another module). | Monitoring and Logging |
| 6 | How to examine the Decode Table using the Search. Principle of the Table Search. Searching by column, with or without value. Searching very long tables. | Search |
| 7 | Evolution of the specification over time. Reasons for the evolution. Dealing with different generation sensors. Anticipated new features in upcoming 2012 version. | Versions: 2007/2010/2012 |
| 8 | Physical Layer examination, validation and testing. Using parameters to measure the rise and fall time parameters. Taking advantage of the regular mesh induced by the stable Ticktime. Examining the staggered transitions with several zooms. | Physical Layer Validation |
| 9 | How to use the Pass-Fail system to monitor a sensor. Parameters that can be exposed to Pass-Fail validation. Determining the Pass-Fail limits.Usage of Statictics and Histograms to determine reasonable limits. Deriving the limits from the specification. | Application of Pass-Fail System |
| 10 | Principles of Remote Control. Accessing DSO objects. The different DSO remote objects, reading, writing in and out of objects. Accessing the decode result table. Why the table is so useful for tesing and validation of SENT sensors. Examples of programs using Remote Control. How to search the table for various values or time spans. | Remote Controlled Operations |
| 11 | Known cases of usages not conforming to specifications. | Variations of SENT outside specifications |
| 12 | The need to Monitor Multiple Sensors. Using the 4 channels of the oscilloscope. Using the digital channels. Routing the inputs to the decoders. Combinations with remote usage. | Monitoring Multiple Sensors simultaneously |
| SENT TRAINING LOGISTICS | ||
| Link | Explanation | |
|---|---|---|
| 1 | Modern oscilloscopes have grown to be powerful analysis machines with countless systems and subsystems. While digital oscilloscopes have become omnipresent, they are often underused, or used in non-optimal fashion. This training seeks to make users more efficient in their daily usage of the DSO, as well as increase the creativity of engineers confronted with various challenges. The methods explained and experimented help engineers at all stages of the life cycle of product development. Depending on the needs, the material can be applied: at the IC design stage, IC validation stage, when integrating the ICs into mass-produced sensors, in Automated Test Equipment (ATE), on production sites, whwn trouble shooting prototypes, on faulty vehicles and in documentation. | Importance of Training |
| 2 | Lahniss provides Training sessions on your site using your own Teledyne LeCroy oscilloscopes. The whole training is divided into modules, each module includes an explanatory part and a "Hands on" laboratory session, during which the principles explained earlier are applied and verified. For the sake of efficiency Lahniss provides portable, signal sources for SENT. When desired, it is also possible to use customers' signals, provided the signal sources are delivered to Lahniss sufficiently ahead of the training and packaged in a way that the signals can be readily probed. In some cases, signals stored in Memory files are used. | How is the Training organised? |
| 3 | In order to reach optimal efficiency, the organisation of the training has to be fairly well controlled. The following rows detail the requirements on the room and the equipment. | Detailed logistics |
| 4 | An ideal class room for the hands-on training on the instruments is a U-shaped table with ample space around it. The instructo'rs seat is at the base of the U and the participants take place on the wings of the U. Each seat requires power and if possible Internet access. |
Requirements on room layout |
| 5 |  |
Layout of an efficient training room |
| 6 | The instructor's setup requires power connection, if possible Internet access, space for mouse and keyboard, space for demonstration material, and a VGA connection to the beamer. If the beamer has a remote control, it also needs to be available. It is prefered to have a beamer with signal auto-detect and auto-set, so that VGA cable can be swiftly swapped to a participant's oscilloscope for showing interesting screens when needed. | Requirements on instructors slot |
| 7 | Each participant seat requires power connection, if possible Internet access, space for mouse and keyboard, as well as space for the signals sources (provided) and the probes or probing fixtures connecting the signal source to the input channels of the oscilloscope. A typical set-up is between 1.5 and 2 meters wide per participant. It is handy to have a pocket calculator available for quick conversions, such as bit time, frequency, sample rates to avoid using the on-screen calculator. | Requirements on participants' slots |
| 8 | The DSOs have to be sufficiently uptodate to support the SENT decoder and upgraded to the latest release of the firmware. The DSO must have the DECODE_MEASURE key installed. It is very convenient to have an external screen connected to each DSO, so that operations such as panel recall or automation can be monitored without having to flip windows on the single screen. Having a large external screen is also convenient when more than one participant share a DSO. | On which machines does the training take place? |
| 9 | Upon completion of the whole training, attendees will
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Objectives |
| 10 | This training is intended for engineers not familiar with SENT, who need to climb the learning curve. The training is suitable for engineers involved at every step of the process: IC development, testing, module integration and validation, system level validation and integration. While the training is focused on SENT, it makes use of several valuable tools embedded into the DSO and provides good understanding of these tools. The knowledge acquired can easily be transferred to other protocols. | Audience |
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