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1. Used for device clock synchronization
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A: The high-precision clock solution includes a clock source and a synchronization chip. This course will explain the clock source GPS module, but the device-level synchronous Ethernet and PTP are not involved. If you are interested, you can contact your local FAE for further discussion.
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2.What functions does ADAS include?
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A: ADAS is a very broad category, mainly covering the functions in the SAE (Society of Automotive Engineers) autonomous driving classification. SAE divides autonomous driving into six levels from L0 to L5. That is, from human driving (L0) to assisted driving (L1/L2), to autonomous driving (L3/L4), and finally to unmanned driving (L5). For example, some functions that have been realized, such as AEB (automatic emergency braking system), ACC (adaptive cruise control), IPA (intelligent parking assistance), etc., are all ADAS functions.
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3.What are the main challenges of precision timing?
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A: This depends on how precise the accuracy is. Generally, wireless requires 1.5us.
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4.What are the main challenges of precision timing?
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A: In the entire network, the indicators are allocated to the time source, the transmission equipment and the wireless side have different requirements. At present, the technology is relatively mature.
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5. Can it output B code?
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A: Microchip does not output B code yet
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6.ns level
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A: We have a high-precision 1588 solution that can implement ns based on TSN in the car.
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7.ns level
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A: Implement ns
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8.ns level
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A: We can achieve ns-level synchronization accuracy, but this course does not cover this part. If you are interested, please contact me by email at charles.yang@microchip.com
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9. Question: Can I use the Beidou system?
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A: Yes, but you need to use different GNSS recorders.
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10. The 1588 solution is based on Ethernet, right? What accuracy can you achieve?
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A: We can achieve classD 5ns single-hop synchronization accuracy.
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11.Is there any EMC solution for clock?
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A: Microchip chip-level clock solutions support spread spectrum and other technologies to improve system EMC
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12. Will today's topic be related to timekeeping accuracy? After discarding external time synchronization, what about timekeeping accuracy?
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A: This is not covered yet. The accuracy of timekeeping is mainly related to the aging rate and temperature stability of the crystal oscillator used. If you are interested, please contact us.
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13.Are there any requirements for the crystal oscillator?
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A: Yes, there are requirements. Today we mainly introduce chip-level atomic clocks.
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14. Does Microchip have precise positioning solutions for indoors and outdoors?
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A: Microchip has both system-level GNSS system-level related products and chip-level solutions, as well as high-precision local oscillator OCXOs and atomic clocks that support these systems.
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15. What is the frequency stability of a chip-level atomic clock over the entire temperature range? How does it compare to a constant temperature crystal oscillator?
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A: The frequency of CSAC can be stable up to 5E-11, while the frequency of general crystal oscillator is about 4.6E-
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16. What is the frequency stability of a chip-level atomic clock over the entire temperature range? How does it compare to a constant temperature crystal oscillator?
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A: 4.6E-6. Even a good crystal can only reach -10.
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17.Same question, what is the significance of using GNSS for clock synchronization in cars?
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A: Autonomous driving requires that vehicles have the same time reference in order to achieve real-time coordination between vehicles.
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18. Could you please tell me what are the main methods and the highest accuracy that can be achieved for clock calibration or measurement in China at present?
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A: Currently, the National Time Service Center and the Institute of Metrology can achieve the highest precision calibration in China. Both use a clock group (hydrogen clock and cesium clock) to achieve 10ns.
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19. Could you please tell me what are the main methods and the highest accuracy that can be achieved for clock calibration or measurement in China at present?
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A: 10ns synchronization. In addition, the current common view system can also achieve 10ns accuracy, and some laboratories can achieve 100ps accuracy between master and slave.
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20. Precision challenge, what is the allowable error range?
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A: Class D requires 5ns, taking into account some positioning requirements
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21.Is there any way to improve the relative positioning accuracy? Is there any solution to set the location by ourselves without using satellites?
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A: RTK can achieve centimeter-level positioning accuracy, but this technology is also based on GNSS.
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22. Does car vibration affect timing accuracy?
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A: Vibration will place more stringent requirements on the crystal oscillator. This is the MEMS clock generator mentioned in the film, which meets the requirements of automotive regulations.
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23.What is the smallest package size of CSAC chip at present?
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A: Dimensions: 1.6" × 1.39" × 0.45"
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24.What does Proxy GNSS layer mean?
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A: Proxy GNSS LAYER means that GNSS timing is reduced to the street level, about 7 meters. The CASC products we just talked about are installed on street lights to provide high-precision timing and positioning services.
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25.What is the highest accuracy of the current civilian GPS positioning system?
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A: GNSS combined with RTK base stations can achieve centimeter-level positioning, but the RTK base stations are not yet particularly perfect. China Mobile and China Unicom are currently paying attention to the construction of RTK base stations.
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26.What is the time accuracy of the high-precision 1588 solution?
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A: Single jump is less than 5ns
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27.What does RTK mean?
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A: RTK (Real Time Kinematic) is a real-time dynamic measurement technology based on carrier phase observation. It is a breakthrough in the development of measurement technology. It consists of three parts: base station receiver, data link, and mobile station receiver. A receiver is placed on the base station as a reference station to continuously observe the satellite, and its observation data and station information are sent to the mobile station in real time through radio transmission equipment. While receiving GPS satellite signals, the mobile station GPS receiver receives the data transmitted by the base station through wireless receiving equipment, and then calculates the three-dimensional coordinates and accuracy of the mobile station in real time based on the principle of relative positioning (i.e., the coordinate difference △X, △Y, △H between the base station and the mobile station, plus the WGS-84 coordinates of each point obtained by the base coordinates, and the plane coordinates X, Y and altitude H of each point of the mobile station are obtained through coordinate conversion parameters). There are radio mode and network communication mode.
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The accuracy of 28.4.6E-6 cannot meet the requirement of 10min 4us error.
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A: 4.6E-6 is the uncalibrated frequency deviation. After calibration, it is still easy to meet the 10 min 4us requirement.
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29.What are the current practical application cases of Microchip's solutions?
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A: Microchip has an introduction to ADAS applications. There are also block diagrams of several modules at the bottom of the page. You can refer to https://www.microchip.com/en-us/products/clock-and-timing/applications/automotive-timing/adas
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30.What are the advantages of microchip in the field of high precision?
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A: The product range is complete and the performance is excellent, including system-level GNSS and chip-level high-precision solutions, 1588 Servo algorithms that meet various profiles, and also high-precision local oscillators
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31.A single jump is less than 5ns. What does a single jump mean?
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A: It is a single device, such as BC device with one input and one output
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32. In the ECU block diagram, the MEMS clock generator generates multiple clocks. If the routing of the multiple clocks is relatively long, how to optimize the EMI of high-frequency harmonics?
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A: There are edge slope adjustment and spread spectrum technology to deal with EMI problems
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33. Can the drift over the entire temperature range be calibrated?
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A: If it is in the tracking state, it can be calibrated. If it is in the hold state, it cannot be calibrated.
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34.What is the minimum size of a Microchip clock chip?
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A: The minimum size of MEMS is 1.6*1.2mm
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35.How is clock calibration achieved?
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A: Generally, the output of the clock chip is adjusted by a digital phase-locked loop or an atomic clock.
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36.How are the edge slope adjustment and spread spectrum adjusted? Is it through simple methods such as external resistors?
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A: You need to adjust the internal parameters through the access interface, or you can enable and adjust it through GPIO
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37. What fields of chips are there?
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A: Communications, IoT, ADAS, data centers, etc.
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38.Is high-precision 1588 a system design issue? What are the hardware requirements for the system?
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A: Yes, the hardware needs to support high-precision PTP poking. In addition, the internal routing of the system will also affect the final accuracy. If it passes through the buffer, special processing is also required.
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39. Is our solution based on SYNCE/GPS+IEEE1588?
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A: Yes, this is also our advantage in the industry
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40. Can you send us the information of this MEMS?
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A: The advantages of EMS include anti-vibration, high reliability, temperature stability, small package, multi-channel output, programmable output frequency, short startup time, etc. For more details, you can refer to the MEMS technical white paper https://ww1.microchip.com/downloads/en/DeviceDoc/00002344A.pdf You can also search the following information on the microchip official website AN2340 - Immunity of MEMS Oscillators to Mechanical Stresses - Immunity of MEMS Oscillators to Mechanical Stresses AN2399 - MEMS Oscillators Offer Immunity to EMI MEMS Clocks FAQs Microchip Oscillators and Clocks Using MEMS Technology
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41.Is there a correspondence between ADAS and the 1.5us wireless requirement?
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A: No corresponding relationship
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42.What is the minimum package size of the CSAC chip?
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A:1.6" × 1.39" × 0.45"
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43.What is the concept of precision timing?
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A:ns
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44.What are Microchip's synchronous chips? Are there any automotive-grade products?
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A: For our automotive-grade clock chips, please refer to this link: https://www.microchip.com/ParamChartSearch/Chart.aspx?branchID=9989017
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45.What are the main precision timing chips used by Microchip in ADAS systems?
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A: The chip-level atomic clock products introduced here
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46.What are the main methods used by Microchip’s chip-level clock solution to improve EMC?
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A: Clock edge slope adjustment and frequency spreading
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47.How to apply for samples?
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A: You can contact local sales.
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48. Where can I download the information? Thank you.
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A: System information about frequency/time synchronization can be obtained from the website: https://www.microsemi.com/product-directory/3425-timing-synchronization
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49. Why do cars need a universal reference clock? Cars don’t need synchronization.
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A: Smart cars need it, and now all have onboard GPS receivers. Synchronize with external GPS
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50.Does it require a high-frequency crystal oscillator?
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A:1588 depends on the application environment and network, as well as the performance requirements to choose the local oscillator type, from XO to 3E OCXO.
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51.What communication method do 1588 and MCU use?
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A: The interface of the clock chip is SPI or I2C
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52.How long does the time synchronization cycle take?
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A: This depends on the specific solution. PTP is usually adjusted 16 times per second, while GPS is adjusted once per second at the shortest. Some may adjust once in a long time. It depends on the specific hardware solution.
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53.What are the adverse consequences if the precision timing problem in ADAS is not solved?
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A: For the future ADAS L5 application, there will be higher requirements for timing and positioning.
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54. What does blocking mean?
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A: GPS signal is blocked or blocked
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55.How is the universal reference clock in a car mainly implemented?
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A: Microchip has an introduction to ADAS applications. There are also block diagrams of several modules at the bottom of the page. You can refer to https://www.microchip.com/en-us/products/clock-and-timing/applications/automotive-timing/adas
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56. What equipment do you have?
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A: We have 1588 equipment available for labs to do interoperability testing, supporting syncE
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57. What equipment do you have?
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A: We have 1588 equipment for interoperability testing in the lab, supporting syncE, 1588, NTP, and pps
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58. What equipment do you have?
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A: We have 1588 equipment available for labs to do interoperability testing. It supports syncE, 1588, NTP, pps and other signal outputs. The product name is Time Provider 4100.
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59.What are the requirements for crystal oscillators?
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A: In-vehicle applications must meet automotive standards. In terms of timing or 1588 performance, the accuracy and network PDV to be achieved determine the choice of XO/TCXO/OCXO with different stability.
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60.What are the practical scenarios for the application of microchip in automotive Ada's?
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A: Microchip has an introduction to ADAS applications. There are also block diagrams of several modules at the bottom of the page. You can refer to https://www.microchip.com/en-us/products/clock-and-timing/applications/automotive-timing/adas
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61.Is the interface an IIC interface?
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A: SPI, I2C
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62.What kind of communication interface do the clock chip and MCU use?
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A:SPI,I2C
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63. Does Microchip have a low-power positioning solution that can switch between indoor and outdoor?
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A: CSAC is a low-power solution. GNSS+1588 can be used to switch from outdoor to indoor.
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64. If safe driving depends on the absolute position of the car, it doesn’t feel good. Safe driving mainly depends on environmental perception.
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A: It should be high-precision positioning plus environmental perception. Today we mainly focus on high-precision positioning.
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65. In urban environment, the GNSS positioning signal will not be very good due to the obstruction of high-rise buildings.
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A: Yes, this is GNSS blocking.
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66. Is this timing a single-board clock or a wireless network timing correction?
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A: This can be a clock board, or it can be connected via GNSS.
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67. Is this timing a single-board clock? Or is it a wireless network timing correction?
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A: This can be a clock board, or it can be calibrated by receiving GNSS signals or other external input signals.
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68.Does it support BeiDou satellite system?
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A: Yes, you can use a BeiDou-supported receiver.
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69.What is the frequency accuracy of CSAC?
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A:0.00000000005
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70.Has Microchip's solution passed functional safety certification?
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A: Clock chip is not available at present.
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71.Is multi-channel and multi-frequency output achieved internally through PLL?
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A: Yes
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72.How is time synchronization generally handled in tunnels?
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A: If GNSS cannot cover, you can consider 1588
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73.In which devices are inertial measurement units installed?
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A: Not integrated in CSAC, but in external circuit
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74. How do we prevent blocking and deception in our design?
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A: Regarding blocking and spoofing, special analysis software is required. We have BlueSky products that can help analyze and identify such signals.
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75.Is it inside the car?
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A: Today we will introduce the contents both inside and outside the car.
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76.What are the temperature requirements for precision timekeeping?
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A: Rapid temperature changes will affect timing. Some standards specify the amount of temperature change, which should be considered in the response plan.
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77.What level of timing accuracy can be achieved?
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A:NS level
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78.What frequency interference can interfere with the timing IC?
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A: Generally, high-power transmitting equipment and frequency multipath effects will interfere with GNSS reception.
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79.What are the consequences if the precision timing problem in ADAS is not solved?
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A: Coordination between vehicles cannot be guaranteed
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80. I have used MICROCHIP chips to make switches, and the technical support is still very strong.
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A: Thank you for your recognition
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81. At present, which MCHP precision timing product has the highest resolution and accuracy? What are the subsequent product goals? Thank you!
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A: System-level timing products include TimeProvider 5000, TimeProvider 4100, SyncServer s6xx, GridTime 3000, etc. For details, please refer to the website information. https://www.microsemi.com/product-directory/3425-timing-synchronization
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82. Our application scenario is a distributed system. A project has dozens of devices that need clock synchronization.
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A: You can consider deploying our clock system-level products. Please discuss the details.
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83. Our application is not for automobiles, but for indoor and outdoor personnel and object positioning, mainly used in industrial and mining areas
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A: You can consider CSAC for positioning applications
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84.What are the adverse consequences if the precision timing problem in ADAS is not solved?
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A: For the future ADAS L5 application, there will be higher requirements for timing and positioning.
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85.What are the adverse consequences if the precision timing problem in ADAS is not solved?
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A: For the future ADAS L5 application, there will be higher requirements for timing and positioning.
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86. Does more ECU clocks mean that the whole system is less robust? When a core controller clock fails, is there a backup clock?
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A: We have not seen any demand for clock backup at this time.
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87. What are the special requirements for the environment?
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A: CSAC has a wide operating temperature range and can operate from –40°C to +80°C
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88.How does Microchip achieve high-precision design? Does the chip have temperature detection and adjustment?
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A: Temperature detection and adjustment are generally completed by peripheral circuits.
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How are 89.10G Ethernet switch and PCB switch interconnected?
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A: Through PCIE interface
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How are 90.10G Ethernet switch and PCB switch interconnected?
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A: Generally speaking, Ethernet switch
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How are 91.10G Ethernet switch and PCB switch interconnected?
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A: Some Ethernet switches support PCIE interfaces.
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92.How accurate is the ADAS system?
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A: In the future, the positioning accuracy requirement for L5 level needs to reach centimeter level.
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93.Does the ECU in smart cars also require a large number of clock units?
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A: At present, the trend seems to be like this. For example, we listed an example in the PPT. At present, a smart car is on the market, with a total of 56 clocks.
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94. Has it passed the 26262 certification? What is the security level?
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A: Clock chip is not available at present.
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95.Which code should be considered for transmission time in ADAS system communication timing?
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A: Precision timing requires consideration of transmission delay, the smaller the better
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96.Is there a high-precision clock solution?
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A: We can use chip-level atomic clocks outside the car, and we have a 1588 solution based on TSN inside the car. It can achieve ns-level accuracy.
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变色卡
千斤顶
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