TPMS

Truck tire pressure detection scheme based on Infineon SP40T

TPMS(Tire Pressure Monitor System) Tire Pressure detection has been included in the standard equipment of cars (passenger cars) in many countries. New cars must be equipped with TPMS to meet the regulations before they can be sold. As for the medium and large commercial vehicles such as trucks, trucks have not been included in the specification, but in order to drive safety, reduce the injury caused by overloading tire burst, and the company or brand image, there have been more and more car factories or teams began to import TPMS.

Infineon has launched SP40T for tire pressure testing of medium and large vehicles. The tire pressure range is from 100KPa to 1600KPa, which can meet most requirements. SP40T integrated chip in addition to tire pressure detection module, also contains acceleration, temperature, battery voltage detection module. Compared with the previous generation SP37, the chip reduces the volume by 50%, and the static current is lower to 250uA. It has the market advantages of high integration, small size and power saving.

Infineon TPMS tire pressure module has been promoted for nearly 10 years. From the early SP30, SP35, SP37 to the current mainstream SP40, Infineon TPMS has rich experience in module adjustment. It can provide suitable solutions to customers and assist customers to adjust the matching of software, hardware and antenna to meet product requirements.

1. Software: Provide basic software solutions according to customers' specifications, which customers can learn and add to their own applications

2. Hardware part: provide reference line, help customers design, schematic and layout review

3. Antenna matching: according to the customer's antenna type and hardware design, assist the customer to match components to achieve the best transmit power.

* Fine Tune antenna matching, using spectrum analyzer measurement

4. Product testing: assist customers to solve product testing problems

* Test product functionality using Trigger/Receiver Tool

▶Scenario Application Diagram

▶Product Entity Diagram

▶Display Version Photos

▶Solution Block Diagram

▶Core Technology Advantages

· Absolute pressure detection range from 100KPa to 1600KPa maximum

· Accelerometer detection range is from -355G to 355G

· 315MHz and 434MHz FSK/ASk transmitters

· 125KHz ASK high sensitivity receiver

· 250nA ultra-low static power consumption

· 8bit MCU, 14KB Flash

· Support wireless burning

· Operating voltage range 1.6V~3.6V

· Operating temperature -40~125 degrees

▶Project Specifications

· Implement TPMS transmitter sample using SP40EVK, detection data include pressure, acceleration, battery voltage and temperature

· Supports 315MHz and 434MHz transmission frequencies

· Adjustable center frequency and offset range

· Carrier Baudrate is adjustable

· Antenna using SP40EVK pre-configured 50 ohm antenna

· Support 125KHz low frequency trigger