Automotive Central Body Controller supervises and controls functions related to the car body such as lights, windows, door lock and works as a gateway for CAN and LIN networks. Load control can either be directly from the DBM or via CAN/LIN communication with remote ECUs. The central body controller often incorporates RFID functions like remote keyless entry and immobilizer. Today’s vehicles contain unprecedented levels of electronics, which have elevated the value of electronic intelligence and connectivity. The central body controller supervises and controls automotive body and convenience functions and works as a gateway for CAN and LIN networks.

Automotive Central Body Controller

Automotive Central Body Controller Design. Curtesy: Texas Instruments

Major Components of Automotive Central Body Controller

  • Power Management: The power supply is connected to the 12V or 24V board net and regulates down/up to voltages for DSP, uC, memory and ICs and functions like driver ICs, LF and UHV base stations and the various communication interfaces.
  • Communication Interfaces: Allow data exchange between independent electronic modules in the car, as well as remote sub modules of the Central Body Controller. High Speed CAN (up to 1Mbps, ISO 119898) is a two wire, fault tolerant differential bus. With a wide input common mode range and differential signal technology it serves as the main vehicle bus type for connecting the various electronic modules in the car with each other. LIN supports low speed (up to 20 kbps) single bus wire networks, primarily used to communicate with remote sub functions of the infotainment system.
  • Load Drivers: The main load driver types in a central body controller are lights and relay drivers. Often the switches and drivers for the exterior lighting are placed on the controller directly. Relays are used to power other electronic modules or high power loads. Current monitoring supervises demand from the distributed loads, other ECUs and can be used for charge and load management of the car battery.
  • RFID Functions: The two most common automotive RFID functions are the immobilizer and the remote keyless entry system. TI provides the LF base station IC for encrypted communication with the ignition key (immobilizer) as well as the Ultra Low power sub 1-GHz UHF transceiver for communication with the remote control for locking/ unlocking the doors and the alarm system.
  • Microcontrollers: The microcontroller (uC) works as gateway for the bus and network interfaces and controls the various load drivers in the central body controller.

To support the growing importance of automotive electronics, TI offers a wide and deep portfolio of products and design support that enables increased conversion efficiencies, data exchange, current monitoring and remote communication. TI allows designers to reduce the number of electronic control units in vehicles through higher component integration, as well as enhancing the performance, power efficiency and flexibility of body and convenience functions.