On March 19, 2015, Dalian United Holdings, a leading electronic component distributor dedicated to the Asia-Pacific market, announced that its product has launched a tire pressure monitoring solution based on Infineon SP37.
According to statistics from relevant departments and agencies, 70% of traffic accidents on highways in China are caused by tire pressure: tire pressure is too high, accounting for 20%, tire pressure is less than 57%, and others are 23%. A puncture occurs when the speed is above 160 km, and the death rate is 100%. Therefore, the tire pressure monitoring system (TPMS) has become the third largest car safety system after ABS and airbags.
As of 2014, China's car ownership should be around 150 million. With the gradual increase in the call for the introduction of relevant compulsory regulations, this market will heat up sharply. It is not difficult to see from the above two figures that the global TPMS market including China will usher in a rapid growth momentum in the next few years. In response to market demand, Dalian Dapin Jiashun launched a high-performance tire pressure monitoring solution based on Infineon products.
Figure 1 - Worldwide regulations and market requirements for tire pressure monitoring
Infineon's SP37 series, which is the third generation of the SP3x family, has sold more than 200 million products worldwide since 2010. The SP37 is a tire pressure sensor chip with a frequency range of 300 to 450 MHz. It integrates a sensor, a single-chip microcomputer and an RF transmitter unit. The maximum output power is +8 dBm (50 Ω load) and the minimum operation is 1.9 V. The internal circuit includes three parts: a power supply filter circuit, a crystal oscillator circuit and an antenna matching circuit.
Internally integrated sensor - Pressure sensor - Accelerometer - Temperature sensor - Battery voltage sensor Internal integrated peripheral resources - 8051 core - Flash memory - 3 GPIO
- ADC
- 125KHz low frequency receiving unit - 315/433MHz transmitting unit
Figure 2 - Integraon SP37 internal architecture diagram
Program features:
Sensor communication fault alarm duration: ≤ 10min;
Battery model: CR2450HR (electricity: 550mAh);
RF frequency: 433.92±0.1MHz;
No RF emission average operating current: ≤ 1μA;
Maximum operating current of RF emission: ≤15mA;
High frequency transmission power: 7 ~ 9dBm @ 50Ω;
High frequency modulation mode: FSK (9.6Kbps);
Low frequency receiving frequency: 125±5 KHz;
Low frequency receiving mode: ASK (3.9Kbps);
Low frequency signal receiving sensitivity: 1~50mVp-p;
Pressure measurement range: 0~4.5Bar;
Pressure measurement resolution: 25mBar;
Temperature measurement resolution: 2 ° C;
Pressure measurement accuracy: ±75 mBar @ -20°C~+70°C, ±150 mBar @ -40°C~+120°C;
Temperature measurement accuracy: ±4°C@ -20°C~+70°C;
Resistance to rotation: ≥1500g;
Operating temperature range: -40 ° C ~ +105 ° C;
Storage temperature range: -40 ° C ~ +125 ° C.
Figure 3 - The top-level architecture model of the tire pressure monitoring solution system of the Infineon SP37
Figure 4 - Terminal system frame diagram of tire pressure monitoring solution for Infineon SP37 (SP37, TDA5235/TDA5240)
Figure 5 - Dalian Dapinjia Infineon SP37 Sensor Board
Figure 6 - Large cross-section of the tire pressure monitoring solution installed by Infineon SP37
Figure 7 - Top view of the tire pressure monitoring solution installed in the Infineon SP37
Figure 8 - The specific parameters of the Infineon SP37 tire pressure monitoring sensor
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