Product Brief TLE 7729 4 Channel Airbag Satellite Receiver IC SatRIC TM Embedded Diagnostic Functions T h e T L E 7 7 2 9 – SatRICTM - is a highly integrated interface IC specially designed for automotive restraint applications. The device, located in the ECU ■ Leakage detection to GND and Battery (Electronic Control Unit) of the airbag system, is able to receive data from different ■ Ground loss detection types of intelligent sensors like inertia and pressure sensor satellites for front-, ■ Short to GND and open detection at every reference pins side-, or rear-crash sensor applications. It provides a pre-regulated power supply voltage to the satellites over a twisted pair of wires. The satellite module transmits digital data to TLE 7729 by modulating the line current. VCC 6 VSYNC12 28 VBUS12 1 VBUS34 14 22 SATREF12 Power Supply & Control IREF 23 Applications ■ VSYNC34 15 20 SATREF34 VSYNCxy Automotive Restraint Applications VBUSCxy SATFD1 - Driver Features 4 independent satellite receiver channels for current modulated data ■ Each channel can support up to two satellites with 6 V/11 V SATFD1 27 a total of up to eight sensors Data rate 125 kBaud ■ Support of 11-, 13-, 18-Bit Manchester 1 or 2 encoded messages ■ Channel configuration in pairs (Bus Mode, Protocol Type) ■ Supply of satellite channels via 4 independent voltage regulators ■ Adjustable current level detection thresholds ■ Asynchronous and synchronous data transmission modes ■ All digital I/Os are 3.3 V and 5 V compatible ■ 4 Digital outputs for voltage-converted received satellite signals ■ 16-bit 8 MHz Serial Peripheral Interface (SPI) ■ Embedded protocol handler for data preprocessing ■ Small P-TSSOP-28 Package Embedded Protection Functions ■ Current limitation in case of satellite output shorted to GND or Battery ■ Channel specific over-temperature shutdown www.infineon.com/restraint-system-IC Automotive Power 18 SATSYNC 11 RxD3 4 RxD2 25 RxD1 Logic Data ■ 8 CLK Protocol Handler & Control Logic SATFD2 2 Control ■ 24 RIN Sense & Control SATFD 2 - Driver 9 MOSI SATFD3 13 SPI Interface SATFD 3 - Driver 5 MISO 19 CS 10 SCK SATFD4 16 SATFD 4 - Driver TLE 7729 7 21 26 AGND DGND N.C. Start Bits Sensor Status CRC Communication Status Channel Address P 17 N.C. System Status 3 N.C. 12 TEST Sensor Data Protocol Handler Receiver Data HW Status Product Brief Application Examples (Side Impact) B-pillar g p p Airbag ECU Right Doors b1 c1 b2 F a1 F Airbag ECU a2 F b3 c2 b4 F ax: up-front sensors (acceleration) bx: pressure sensors in doors cx: acceleration sensor in B-pillar Line 1 Line 2 Line 3 SatRICTM (TLE7729) SYNC MCU SPI Line 4 Left Doors p p g B-pillar Product Summary Type Sales Code Description Package TLE 7729 Available upon request 4 Channel Satellite Receiver P-TSSOP-28 System Overview Pedestrian Protection Bonnet Passenger Sensing High Speed CAN Airbag ECU Safing Engine (XC866) TLE 7729 SatRICTM ER Buck Buck TLE7714 TLE7734 4 Loop Safing Signals CrosSave Buck Buckle Switch VBAT VSAT & VSYNC I/O VLOGIC Published by Infineon Technologies AG 81726 Munich, Germany © Infineon Technologies AG 2006. All Rights Reserved. Legal Disclaimer The information given in this Product Brief shall in no event be regarded as a guarantee of conditions or characteristics (“Beschaffenheitsgarantie”). With respect to any examples or hints given herein, any typical values stated herein and/or any information regarding the application of the device, Infineon Technologies hereby disclaims any and all warranties and liabilities of any kind, including without limitation warranties of non-infringement of intellectual property rights of any third party. Information For further information on technology, delivery terms and conditions and prices please contact your nearest Infineon Technologies Office (www.infineon.com). Published by Infineon Technologies AG Buckle Switch TM VBOOST How to reach us: http://www.infineon.com Doors Front Airbag TLE 6711 Battery Curtains CrosSaveTM g x g g y TLE7718 TLE7738 8 Loop Passenger DualStage p Left Door XC164 MCU Smart Power Switch Occupant DualStage g Sensor SPI TLE 7729 SatRICTM p Front Impact Side Airbag TLE 7259 LIN TLE 6250 CAN Firing SPI Side Impact Right Door p p g Warning Lamp Airbag Off Warnings Due to technical requirements components may contain dangerous substances. For information on the types in question please contact your nearest Infineon Technologies Office. Infineon Technologies Components may only be used in lifesupport devices or systems with the express written approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system, or to affect the safety or effectiveness of that device or system. Life support devices or systems are intended to be implanted in the human body, or to support and/or maintain and sustain and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other persons may be endangered. Ordering No. B112-H8941-X-X-7600 Printed in Germany PS 1106.5 nb