Part # Application Notes Body Electronic Automotive L4979 L9638 L9950 VNH2 AN2334 datasheet

Part Manufacturer: ST Microelectronics

ST Microelectronics

Part Description: Complete car door module


Part Details:

AN2334 Application Note Complete car door module Introduction A car door module typically consists of a rubber-sealed carrier, onto which a variety of door components such as the window lift mechanism, the wing mirror electric motor, the wiring harness, the loud speaker, the door latch inner release cable, locks and various switches are fitted, forming a "cassette". The trend in both Europe and the U.S. is to increase the complexity of the door module by adding more electronic features needed to drive all door loads and functions, with the possibility to connect the module to other car subsystems via standard automotive communication protocols (LIN, CAN). Among many of these automotive subsystems, the connectivity via a single wire, decentralizing electronic modules, reduces the number of wires required and in turn reduces wiring harness weight, contributes significantly to overall vehicle weight reduction. This is of concern to auto manufacturers, who are constantly striving to reduce vehicle weight and to improve fuel efficiency. In this document, an electronic module is presented that controls all the car door functions, including the window lift, all latching/locking operations, wing mirror movement, mirror turn indicator light, defroster and some lamps. To reduce the risk of bodily injury, especially to children, this module also includes an advanced trapping detection feature for the window lift motor, which stops the window if a body member such as a finger, a hand or an arm is introduced into the window climbing area during the window climbing process. A low-cost, high performance, antipinch algorithm based on monitoring the window motor driver current, has been developed. April 2006 Rev 1 1/22 www.st.com Contents AN2334 Contents 1 Car door module description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Algorithms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3 Local Interconnect Network (LIN) messages . . . . . . . . . . . . . . . . . . . . 10 4 PC Keypad software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 5 Hardware implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Appendix A Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 2/22 AN2334 List of tables List of tables Table 1. Door module actuators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Table 2. Application Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Table 3. FR RL RR data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Table 4. Front Right Door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Table 5. PC-VNH2 Diag. data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Table 6. Dashboard data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Table 7. PC - L9950 Diag. data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Table 8. Window and door lock coding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Table 9. Mirror and door lock coding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Table 10. L9950 Loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19


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Application Notes Body Electronic Automotive L4979 L9638 L9950 VNH2 AN2334.pdf Datasheet