Features of a new physical layer interface device MC33661 and its application in automotive electronics

This article introduces the new physical layer interface device MC33661, which is specially designed for LIN bus applications in the automotive industry, and briefly describes its application in automotive electronics.

This article introduces the new physical layer interface device MC33661, which is specially designed for LIN bus applications in the automotive industry, and briefly describes its application in automotive electronics.

LIN bus

With the rapid development of information technology, the proportion of automotive Electronic products used in automobiles is increasing, and automotive electronic technology has gradually become one of the characteristics of automotive high-tech. LIN (Local Interconnect Network) is a low-cost serial communication network, which is now more used to realize distributed electronic system control in automobiles. The goal of LIN is to provide auxiliary functions for existing automotive networks (such as the CAN bus). The LIN bus is based on the universal asynchronous serial port (UART) of a point-to-point computer, coupled with a bus driver suitable for multi-point communication, plus the LIN bus communication protocol to form an inexpensive serial bus control system. The LIN bus is High-end communication bus, such as CAN (Controller Area Network) bus, auxiliary bus. In occasions that do not require the bandwidth and functions of the CAN bus, such as the control of doors, windows, rearview mirrors, and the communication between smart sensors and braking devices, the use of LIN bus can greatly save costs. LIN bus driver MC33661

In the past, LIN bus drivers include MC33399 and so on. With the passage of time, their shortcomings have gradually emerged. For example, the mode is too single, and the flip frequency cannot be effectively adjusted, which causes the power consumption of the device sometimes to be large, and sometimes it appears that the driving power is not enough, and so on. The birth of MC33661 has greatly improved this situation.

MC33661 chip adopts ordinary 8-pin plastic package.

 Features of a new physical layer interface device MC33661 and its application in automotive electronics

Operation mode and application circuit

The multiple operation modes of MC33661 greatly improve the performance of the LIN bus driver. MC33661 has a series of operation modes such as normal mode, low-speed mode, high-speed mode, and sleep mode. This greatly enriches the functions of the chip, and users can set the chip mode according to different needs, and improve the efficiency of the chip while reducing the loss as much as possible. This gives it a great advantage in the competition with the same type of chips, and it is a strong support for LIN bus applications.

When MC33661 is selected as the normal mode, the LIN bus is in a general working state, and the operating frequency and timing of the device conform to the LIN bus protocol specification, and the communication rate is 20kbps.

When the LIN bus is in the ECU test and downloading the program to the microcontroller, the MC33661 can choose the high-speed mode, and the communication frequency can reach 100kbps.

MC33661 can enter the low-speed mode to further reduce the electromagnetic radiation level of the LIN bus, although the electromagnetic radiation level in the normal operating mode is not high.

MC33661 has a sleep mode, the power consumption is extremely low in sleep mode, and the information required for fast startup during sleep is retained, so fast startup can be achieved.

A typical circuit using MC33661 as the master node. When used as a slave node driver, there is no need to connect the diode and pull-up resistor at the pull up end of the Mask node, and directly connect to the LIN bus drive end of the LIN bus. At one end of the single-chip microcomputer, the sending and receiving ends of the SCI port are directly used to control the communication, and an I/O port of the single-chip microcomputer is used as output to control the working mode. The power terminal is directly connected to the 12V car battery. When the vehicle is powered off, the driver enters the sleep mode.

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