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【Application Exploration】Senasic TPMS Sensor Chip SNP739D: Empowering Intelligent Tire Management System TMS

2023-09-01

How often should fleet tires be replaced? Is the corresponding tire management timely and effective? How to prevent car tire blowouts? 


According to the National Bureau of Statistics' Yearbook data for 2022, the number of deaths per 10,000 vehicles in road traffic accidents was 1.46. According to CCTV News Channel's "Weekly Quality Report," 46% of highway traffic accidents are caused by tire failures, with tire blowouts alone accounting for 70% of the total accidents.



Directly addressing the pain points of traditional fleet tire management and monitoring

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Frequent-use commercial vehicle fleets often fail to effectively monitor tire conditions in routine vehicle management. The main reason is the lack of digital management and data support in traditional fleets, which prevents management personnel from collecting tire basic and real-time data in a refined, dynamic, and comprehensive manner. This leads to safety hazards during transportation, including increased tire failure rates, shortened tire lifecycles, and dramatic rises in tire usage costs. Such issues directly impact the operational efficiency of the entire fleet and increase transportation costs.



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  Monitor & analyze tire lifecycle to achieve intelligent management

SENASIC



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The Intelligent Tire Management System (referred to as TMS system below) is a new-generation, fully lifecycle information management platform. Utilizing digital means, it monitors and analyzes tire lifecycles, finely manages tires, and identifies scientific methods for tire management, thereby enhancing the management level of transportation enterprises, ensuring the safe operation of vehicles, and maximizing efficiency



The main modules of the Intelligent Tire Management System (TMS) are as follows：



  Tire Identification

The system has incorporated wireless radio-frequency identification (RFID) communication technology. It utilizes RFID chips, built-in adhesive temperature and pressure sensors, and handheld terminals as carriers for collecting electronic tag identity information of tires, thus achieving the function of electronic tire identity recognition. This establishes an information database for static and dynamic management of the "management, usage, maintenance, and repair" lifecycle processes for each tire.



  Real-time monitoring of tire pressure and temperature  

The Tire Pressure Monitoring System (TPMS) is primarily used to dynamically and automatically monitor tire pressure and temperature during vehicle operation. It detects potential risks to safe driving such as tire leakage, low pressure, high pressure, and high temperature, and promptly alerts the driver, effectively preventing tire blowouts and minimizing the occurrence of traffic accidents caused by tire blowouts. TPMS consists mainly of pressure/temperature transmitters installed inside the vehicle tires, a signal processing unit, and a digital signal processing unit receiver with a liquid crystal display installed on the vehicle dashboard.



  Tire Life-cycle Management Cloud Platform

Based on mobile internet and cloud computing technologies, tire temperature and pressure data is transmitted in real-time to servers through sensor terminals, providing users with uninterrupted data tracking, statistical analysis, and safety supervision. The platform promptly alerts users of various safety hazards it detects and pushes notifications to relevant authorized accounts (enterprises) on the platform for early inspection and elimination of risks.



Cornerstone of TMS System：

 Senasic TPMS Sensor IC SNP739D

SENASIC



In the application of TMS systems, sensors for real-time monitoring of tire pressure and temperature are particularly crucial. The core of these sensors is the TPMS sensor chip SNP739D introduced by Senasic Electronics, which is an excellent single-chip solution.

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Its characteristics are as follows：

Highly Intergrated

  • Calibrated pressure sensor for absolute pressure measurement

  • Temperature and supply voltage sensors

  • XZ-axis accelerometer with calibration

Low Power

  • Quiescent current : 0.25µA

  • RF current (5dBm): 5.4~7mA

High Accuracy

  • Pressure accuracy (-40~125°C): ±5kPa

  • Temperature accuracy (-20~70°C): ±3°C

Wide Adaptation

  • Measurement range: 900kPa/1900kPa

  • Operating temperature: -40~125°C

  • Modulation: FSK/ASK

  • Communication interface: SPI/UART/I2C/LIN

Small Package

  • Package: LGA 24pins. 6.0mm x 5.0mm x 1.9mm


The Senasic SNP739 series chip is the first domestically produced high-integration TPMS chip. Independently developed, it holds over 40 patent certifications. In October 2017, it passed the AEC-Q100 automotive-grade certification and entered mass production. Thanks to its low power consumption and high performance, it quickly gained market recognition and has been purchased by over a hundred customers, with cumulative sales reaching tens of millions.

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Alongside deep collaboration with domestic and international tire suppliers and TMS solution providers, RenJie will explore more applications such as load monitoring, tread depth, road surface monitoring, real-time friction, etc., to propel new energy vehicles towards intelligent, shared, and electrified directions.

For more product information and requirements for complementary development tools, please contact SENASIC technical support at info@senasic.com.

*Some images are sourced from the internet. If there is any infringement, please contact us for removal.





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