China's auto industry has become the world's first market, marking that China's auto industry has entered an era of fierce competition. Therefore, people's requirements for car handling, safety, ease of use, comfort, and intelligence are becoming higher and higher. Large space requirements and more parts have conflicted, which requires automotive parts, especially automotive electronics, to develop in the direction of centralized functions, intelligent control, and information networking, while ensuring high-performance and low-cost products to deal with A highly competitive market. Among many automotive appliances, the first focus is on the body control module (BCM). As the main control and central nervous system of body electrical appliances, BCM's functions are getting stronger and stronger, and its integration is getting higher and higher, which requires more professional semiconductor devices as support.
As a leader in the automotive semiconductor industry, Freescale has been committed to the development and service of the Chinese market, promoting the localization of the auto parts industry, and assisting manufacturers to achieve cost-effective, safer, and more advanced products.
This article introduces Freescale's body control module solution. This solution is mainly composed of MC9S08DZ128, MC33880, MC33742, MC33596, including: lamp control, car lock control, trunk control, glass lifter control, fuel tank cap control, keyless Enter the system and the realization of CAN bus communication technology.
BCM function overview
With the increasing demand for automotive functions, the body electronics are becoming more and more complicated. Generally speaking, the functions included in the body control module are: lamp control, door control, window control, switch and Analog signal acquisition, CAN bus communication, etc., the Freescale body control module provided in this article provides customers with low-cost, high-performance solutions, mainly including the following functions:
CAN communication
Table 1. Overview of Freescale body control module functions
2. FreescaleBCM block diagram
Three, FreescaleBCM signal list
4. Control Instructions
This program is a typical input and output system, which mainly collects signals through CAN bus signals, analog signals and various interrupt signals, and controls the related body electrical equipment through BCM data processing and conversion, including: lights, motors, relays Wait for control, and process the signals collected by some sensors, and publish them to relevant professional electrical equipment through the CAN bus.
5. Schematic diagram of CAN bus
6. Description of chip functional characteristics
6.1, MC9S08DZ128
• 40-MHz HCS08 central processor (20-MHz bus)
• HC08 instruction set and supplement BGND instruction
• Supports up to 32 interrupt / reset sources
• Support 128kFlash2kEEPROM8kRAM
• Two low power consumption stop modes
• Wait mode with reduced power consumption
• Real-time interrupts with very low power consumption in run, wait and stop modes
• Multifunctional clock generator, support PLL and FLL mode
• Watchdog reset
• Low voltage detection circuit with reset and interrupt; selectable voltage threshold
• Support illegal instruction code reset
• Support illegal operation address reset
• Support Flash block protection
• Support clock signal loss protection
• Single line background debugging interface
• On-chip and online simulation (ICE) with real-time bus capture
• 24-channel ADC
• Two analog comparators ACMPx
• MSCAN—CAN protocol – V2.0A and B;
• Two SCI
• SPI
• IIC—support bus baud rate up to 100kbps;
• TPMx—one 6 channel (TPM1) and one 2 channel (TPM2);
• RTC
I • 87 general-purpose input / output (I / O) pins and one dedicated input pin
• 32 interrupt pins, each with trigger polarity selection
• All input pins with voltage hysteresis and configurable pull-down devices
• Configurable output slope and drive strength on all input pins
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