Circuit Design of Intelligent Tire Pressure Monitoring System Based on MPXY8300

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Overview:
The tire pressure monitoring system is a new type of vehicle safety guarantee system that can monitor the tire pressure and temperature of each tire and display it to the driver in real time through the vehicle display system. When there is a dangerous signal such as low tire pressure, it can Issue warnings in a timely manner to enable drivers to discover the safety hazards of the car in time and avoid disasters.
The current tire pressure monitoring system faces problems such as low service life and single function. In this paper, a smart tire pressure monitoring system based on Freescale's MPXY8300 sensor chip is designed for these problems. The system has the following features:
(1) High system integration and good reliability;
(2) has a leak detection function;
(3) Low power consumption and long service life.

1 System Architecture The intelligent tire pressure monitoring system designed in this paper consists of two parts: the tire pressure monitoring module and the central control module. The system architecture is shown in Figure 1. Among them, the tire pressure monitoring module needs to reduce power consumption and reduce the size, and the central control module needs to effectively analyze the data and issue a warning in time. At present, the mainstream tire pressure monitoring circuits are Qualcomm, Infineon and Freescale [3]. Among them, Freescale's solution integrates pressure sensor, acceleration sensor, temperature sensor, RF transceiver circuit and MCU core into one chip, the integration is high, and the power consumption of the chip is very low, so this article uses Freescale's The MPXY8300 serves as the core of the tire pressure monitoring module. In order to increase the service life of the module, it is necessary to select a suitable battery while reducing the power consumption of the chip. This article uses the ER2450 to power the tire pressure monitoring module. The ER2450 is a high-quality lithium-ion battery with a very low self-discharge rate and a storage life of up to 10 years to meet the needs of the system.

2.2 Central Control Module Hardware Design The central control module consists of RF circuits, microcontrollers, LCDs, and sound and light alarms. The RF circuit is based on Freescale's MC33696 chip. The MC33696 is an integrated PLL-tuned UHF data receiving and transmitting chip. In this system, the chip is only used for RF data reception. The MC33696 integrates a 660kHz mid-band pass filter, a mirror-removable mixer, a voltage-controlled oscillator, a Manchester encoding circuit, and an SPI interface. After receiving the radio frequency signal from the tire pressure monitoring module, after amplification and demodulation, the digital signal is sent to the single chip microcomputer through the SPI interface. The circuit of MC33696 is shown as in Fig. 3.