LIN transceiving control circuit and dormancy and awakening control method thereof

Abstract

The invention relates to the technical field of automobile electronic controllers, in particular to an LIN transceiving control circuit and a dormancy and awakening control method thereof. The systemcomprises an MCU, an LIN transmit-receive circuit, an LIN signal detection circuit, a wake-up processing circuit, an external wake-up detection and power supply control circuit, a first power supply enable circuit, a first power supply voltage stabilizing circuit and a second power supply enable control circuit. A WK signal output end of the wake-up processing circuit is connected with an LIN transceiver circuit. An RXD _ MCU signal output end of the LIN transceiving circuit is connected with MCU. The LIN signal output end of the LIN transceiver circuit is connected with the LIN signal detection circuit, the first enable signal output end of the LIN signal detection circuit is connected with the second power supply enable control circuit, and the second enable signal output end of the external wake-up detection and power supply control circuit is connected with the second power supply enable control circuit. The phenomenon that the LIN transceiver circuit is interfered and halted by static electricity of-25kV at the temperature of-25 DEG C or below is avoided. Meanwhile, the ultra-low quiescent current requirement of the automobile electronic controller is met.

Description

technical field [0001] The invention relates to the technical field of automotive electronic controllers, in particular to a LIN transceiver control circuit and a sleep and wake-up control method thereof. Background technique [0002] LIN is a low-cost serial communication network that has been widely used in automobiles to realize distributed control of automotive electronic systems. The cost of the LIN bus is much lower than that of the CAN bus, so the LIN bus is widely used in systems that do not have high requirements for network bandwidth, performance or fault tolerance. For example, the car sunroof control, car door and window control and engine anti-theft locking system all use LIN communication. [0003] Now there are many well-known brands of LIN transceiver chips (ICs) on the market. Their functions, performance and packaging are almost the same, and they can be replaced with each other, and the recommended application circuit of each chip is also very similar. T...

AI Technical Summary

Problems solved by technology

The performance of the car BCM controller designed according to the recommended application circuit of this chip can meet the national standard, but the car equipped with this BCM has a small probability of failure to start in winter in Northeast China. After analysis, it is found that the fault is caused by the BCM The IMMO LIN transceiver chip crashes cause

After further testing and verification, it was found that the LIN transceiver circuit was easily crashed by -25kV static electricity at temperatures below -25°C, and the static electricity entered the IC through the INH pin and caused the internal circuit of the IC to latch.

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