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Automotive Airbag Solution from Freescale
 

Automotive Airbag Solution from Freescale

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To study Airbag solution ad its interface from Freescale Semiconductor

To study Airbag solution ad its interface from Freescale Semiconductor

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  • Welcome to the training module on Study on Automotive Airbag solution. This training module gives solutions based on Freescale product. It also introduces a portfolio of supporting components.
  • Airbags were originally installed to protect the driver from impacting the steering wheel or windshield during a collision, airbags are now standard on the driver and passengers' side for frontal impacts, and many vehicles have side curtain airbags to protect occupants during side impacts. Airbags use a combination of design, sensor, and chemical technologies to deploy successfully during a collision
  • An automobile airbag system is made of three general components: the airbag itself, sensor system, and deployment mechanism. The airbag itself is constructed of a nylon fabric. Each airbag is specifically designed for the specific automobile and location. Airbags use a combination of precise design and sensitive components to provide a mechanism to reduce injuries and fatalities in automobile accidents
  • Air bags are inflatable cushions built into the steering wheel or dashboard, designed to rapidly expand in a frontal crash When a sensor in the car detects a strong front-end collision, it sends an electric current through a wire. As the wire heats up, the charge in the inflator undergoes a chemical reaction, producing a gas at rapidly inflates the bag. As soon as the bag fully inflates, it starts deflating, cushioning the impact
  • The SRS (Supplemental Restraint System) airbag system has the following equipment: Driver Airbag, Front Passenger Airbag, Side/Rear Side Collision, Curtain Shield Airbag. The SRS driver and front passenger airbags are used as supplements to the seat belts to help reduce shocks applied to the head and chest of the driver or front passenger in the event of a frontal impact collision
  • There are two airbags for frontal collisions: driver and front passenger. These airbags deploy simultaneously. The driver and front passenger airbags use a dual-stage control. Airbag Sensor Assembly detects the information indicated below from various sources in order to control the dual stage activation. The driver and front passenger airbags each contain a set of two initiators and propellants. The Airbag Sensor Assembly helps optimize the airbag inflation output by controlling the inflation timing of these initiators. Front airbag sensor contains an electrical type deceleration sensor. Based on the deceleration of the vehicle during a front collision, a distortion is created in the sensor and converted into an electrical signal.
  • The MC33789 is a mixed signal IC for airbag safety applications. The MC33789 provides a cost effective and flexible system IC solution across the range of airbag partitions used in cars and other vehicles. The MC33789 connects to the 12 V vehicle battery and supplies the multiple voltages of a typical airbag system. The MC33789 can detect switched input states, communicate with both local and remote crash sensors. It offers an industry standard interface (SPI) and four PSI5 master interfaces. The MC33789 has a dedicated safing state machine that complements the airbag’s MCU hardware/ software safing approach. Also included are a diagnostic - self protection capability and a programmable analog interface accessible by the system MCU.
  • This slide shows a simplified applicationdrawing.
  • The communication interface between a master device and the MMA51xx is established via a PSI5 compatible 2-wire interface, with parallel or serial (daisy-chain) connections to the satellite modules. The device uses a two wire interface for both its power supply (VCC), and data transmission. The PSI5 master supplies a preregulated voltage. Data transmissions and synchronization control from the PSI5 master to the device are accomplished via modulation of the supply voltage. Data transmissions from the device to the PSI5 master are accomplished via modulation of the current on the power supply line. The PSI5 master modulates the supply voltage in the positive direction to provide synchronization of the satellite sensor data.
  • The typical signal for a DSI ballast is roughly a 9 Bit AC component of 12 Vp-p with a quiescent DC voltage of roughly 4V. The AC component (mark space ratios) determines the level of dimming for the ballast. The DSI ballast allows for Error Checking. The DSI output unit can only report error messages to the C-Bus software.
  • This page gives Freescale’s Airbag Portfolio for list of MCU supported for this application, it includes MPC56XX, MC9S12XE and MC9S08SG family devices
  • This page gives Freescale’s Airbag Portfolio for Sensors which includes PSI5 compatible X or Z axis satellite inertial sensor
  • This page gives Freescale’s Airbag Portfolio for CAN and LIN Transceivers', Squib Driver details.
  • This page gives Freescale’s Airbag Portfolio for Peripheral Sensor Interface.
  • This page gives broad portfolio for Squib driver for Airbag solution available from Premier Farnell.
  • This page gives broad portfolio for Satellite Sensor Interface for Airbag solution available from Premier Farnell.
  • This page gives broad portfolio for Acceleration Sensor Interface for Airbag solution available from Premier Farnell.
  • This page gives broad portfolio for Automotive MCU with LIN & CAN Interface for Airbag solution available from Premier Farnell.
  • This page gives broad portfolio for Peripheral Selection Guide for Airbag solution available from Premier Farnell.
  • Thank you for taking the time to view this presentation on “ Airbag Solution” . If you would like to learn more or go on to purchase some of these devices, you may either click on the part list link, or simply call our sales hotline. For more technical information you may either visit the Freescale site, or if you would prefer to speak to someone live, please call our hotline number, or even use our ‘live chat’ online facility. You may visit element14 e-community to post your questions.

Automotive Airbag Solution from Freescale Automotive Airbag Solution from Freescale Presentation Transcript

  • Automotive Airbag Solution from Freescale
  • Introduction
    • Purpose
      • To study Airbag solution ad its interface from Freescale Semiconductor
    • Outline
      • What is Airbag? And its components, its working principle
      • Layout of its main components, system diagram
      • MC33789: Airbag System Basis Chip (SBC) solution from Freescale
      • Freescale Airbag Portfolio for MCU, Sensors, PSI5 and DSI protocol
    • Content
      • 23 pages
  • What is Airbag?
    • Airbags are a type of automobile safety restraint like seatbelts.
    • They are gas-inflated cushions built into the steering wheel, dashboard, door, roof, or seat of your car that use a crash sensor to trigger a rapid expansion to protect you from the impact of an accident.
    • Automobile airbags are designed to save lives during collisions by cushioning the occupant as he/she decelerates after impact
    • An airbag is more formally known as a Supplementary Restraint System (SRS), an Air Cushion Restraint System (ACRS), or the Supplemental Inflatable Restraint (SIR).
  • Airbag Components and Function
    • An automobile airbag system is made of three general components :
      • The airbag itself
      • Sensor system, and
      • Deployment mechanism
    • Airbag Function During a Collision
      • Time = 0. Automobile makes initial contact with other object.
      • Time = 30 ms. Microprocessor decides to deploy airbags. Signal is sent to deployment mechanism.
      • Time = 32 ms. Pyrotechnic device ignites, and gas enters airbag
      • Time = 60 ms. Airbag is fully inflated
  • How Airbags Work Airbag working principle
  • Layout of Main Components Dashboard components
  • Airbag System Diagram Airbag System Block Diagram
  • MC33789: Airbag System Basis Chip (SBC)
    • Designed to operate 5.2 V ≤ VPWR ≤ 20 V, up to 40 V transients
    • Safing state machine with programmable sensing thresholds
    • Two configurable high side/low side drivers with PWM capability
    • Four PSI5 satellite sensor master interfaces
    • Self-protected and diagnostic capability
    • System power mode control with watchdog and system Power ON Reset (POR)
    • Supports complete airbag system power supply architecture, including supplies for squib firing (33 V), satellite sensors, and local ECU sensors and logic circuits (5.0 V)
    • Nine configurable switch input monitors for simple switch and Hall-effect sensor interfaces
    • 16-bit SPI interface, LIN 2.1 physical layer interface
  • MC33789 Simplified Application Drawing Application Block diagram of Airbag
  • Airbag System— PSI5 Protocol Block Diagram-PSI5 Protocol
  • Airbag System— DSI Protocol Block Diagram- DSI Protocol
  • Freescale Airbag Portfolio
  • Freescale Airbag Portfolio: Sensors
  • Freescale Airbag Portfolio: CAN and LIN
  • Freescale Airbag Portfolio Peripheral Sensor Interface
  • Squib Driver Logic 10A 2 2-channel Squib Driver for Air Bags TPD2004 Toshiba SPI 1.2A 4 4 Loop Airbag Deployment ASSP CrosSave™ TLE7734 Infineon SPI 1.75A 4 4 Loop Airbag Deployment ASSP CrosSave™ TLE7714 Infineon SPI 1.2A 8 8 Loop Airbag Deployment ASSP CrosSave™ TLE7738 Infineon SPI 1.75A 8 8 Loop Airbag Deployment ASSP CrosSave™ TLE7718 Infineon SPI 0.5A 4 Four Channel Squib Driver IC MC33797 Freescale Interface Iout Channels Description Part Number Manufacturer
  • Satellite Sensor Interface 125 Kbps - 4 Channel Airbag Satellite Receiver IC SatRICTM TLE7729 Infineon 5-150 Kbps DSI DSI Slave for Remote Sensing MC33793 Freescale 5-20 Mbps DSI DSI 2.02 Sensor Interface MC33784 Freescale 5-20 Mbps DSI Quad DSI 2.02 Master with Differential Drive and Frequency Spreading MC33781 Freescale 5-150 Kbps DSI Dual DBUS Master with Differential Drive and Frequency Spreading MC33780 Freescale 8 Mbps PAS3- PAS4 Satellite Sensor Interface IC CG974 Bosch Data Rate Protocol Description Part Number Manuf act urer
  • Acceleration Sensor – 40°C to +105°C X Analog ±40g 1 01M6009 1331689 MMA2201EG Freescale – 40°C to +125°C X Analog ±100g 1 81K3067 1566160 MMA2204EG Freescale – 40°C to +125°C X,Y Analog ±5g 2 12M7870 1607242 ADIS16006CCCZ ADI – 40°C to +105°C X,Y Analog ±55g 2 19M8806 1661083 AD22285-R2 ADI – 40°C to +125°C X Analog ±250g 1 19M8804 1319366 AD22283-A ADI – 40°C to +125°C X Analog ±120g 1 19M8803 1319365 AD22282-A ADI – 40°C to +105°C X Analog ±55g 1 19M8801 1319363 AD22280-A ADI – 40°C to +105°C X Analog ±37g 1 19M8800 1319362 AD22279-A ADI Operating Temperature Sensing Axis Output Acceleration (g) No of Axis Newark # Farnell # Part Number Manufacturer
  • Automotive MCU with LIN & CAN No/ Yes 8 ST7 8-bit MCU with 16 to 60K Flash/ROM, ADC, CSS, 5 timers, SPI, SCI, I2C interface 89K1030 1261305 ST72F325J6T6 ST No/ Yes 8 ST7 8-bit MCU, 3.8 to 5.5 V operating range with 8 to 32 Kbyte Flash/ROM, 10-bit ADC, 4 timers, SPI, SCI 89K1026   ST72F324BK6T6 ST No/ Yes 8 ST7 64/44-pin 8-bit MCU with 32 to 60K Flash/ROM, ADC, five timers, SPI, SCI, I2C interface 89K1024 1607941 ST72F321AR9T6 ST Yes/ Yes 20 M16C/60 M16C/29 Group 40P3120 1677799 M30290FCHP#U3A Renesas Yes /Yes 20 R8C R8C/22 Group, R8C/23 Group 40P3239 1677800 R5F21238DFP#U0 Renesas 3/6 80 MHz XC236xA 16/32-Bit Single-Chip Microcontroller with 32-Bit Performance SAK-XC2387A Infineon 3/6 80 MHz XC236xA 16/32-Bit Single-Chip Microcontroller with 32-Bit Performance SAK-XC2365A Infineon 3/6 80 MHz XC236xA 16/32-Bit Single-Chip Microcontroller with 32-Bit Performance     SAK-XC2364A Infineon 5/8 80 MHz S12 16-bit Microprocessor for Automotive 15P2078 1659666 MC9S12XEP100 Freescale 3/4 80 MHz S12 16-bit Microprocessor for Automotive 24M4749 1165814 MC9S12XDT256 Freescale 1/4 80 MHz S12 16-bit Microprocessor for Automotive 24M4755k 1165820 MC9S12XD256 Freescale 5/6 80 MHz S12 16-bit Microprocessor for Automotive 70K3338 1165810 MC9S12XDP512 Freescale CAN/ LIN Speed Core Description Newark # Farnell # Part Number Manufa cturer
  • Peripheral Selection Guide click click DC-DC Boost Regulator click click Automotive Regulator click click LIN Transceiver click click CAN Transceiver click click Pressure Sensor Newark Farnell Block
  • Additional Resource
    • For ordering Airbag Solution parts, please click the part list or
    • Call our sales hotline
    • For more product information go to
      • http://www.element-14.com/community/docs/DOC-22434
    • Visit element14 to post your question
      • www.element-14.com
    • For additional inquires contact our technical service hotline or even use our “Live Technical Chat” online facility