On March 19th, 2015, GreatLink Holdings, a leading distributor of electronic components dedicated to the Asia-Pacific market, announced that its premium product line is based on Infineon SP37 tire pressure monitoring solution. Illustration 1 - Worldwide regulations and market requirements for tire pressure monitoring Figure 2 - Internal Architecture Diagram of Infineon SP37 Fig. 3 - Top-level architecture model of tire pressure monitoring solution system of Daihatsu Infineon SP37 Figure 4 - Frame diagram of the tire pressure monitoring solution terminal system of Daihatsu Infineon SP37 (SP37, TDA5235/TDA5240) Figure 5 - Grand United Infineon SP37 Sensor Board Figure 6 - Mounting sectional view of tire pressure monitoring solution for Daihatsu Infineon SP37 Figure 7 - Top view of the tire pressure monitoring solution installation of Daihatsu Daiei Infineon SP37 Figure 8 - Macross Infineon SP37 tire pressure monitoring sensor specific parameters
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According to the statistics of related departments and agencies, at present, 70% of traffic accidents on China's expressways are caused by tire pressure: tire pressure is too high at 20%, tire pressure is less than 57%, and others are at 23%. A puncture occurred when the vehicle speed was over 160 kilometers, and the death rate was 100%. Therefore, the tire pressure monitoring system (TPMS) has become the third largest automotive safety system following ABS and airbags.
As of 2014, China’s auto ownership should be around 150 million vehicles, and with the gradual increase in the introduction of relevant mandatory regulations, this market will rise sharply. From the above two figures, it is not difficult to see that the global TPMS market including China will surely usher in a rapid growth momentum in the coming years. In response to market demand, Daihatsu Daiei Pinjia launched a high-performance tire pressure monitoring solution based on Infineon products. 
Infineon's SP37 series from Dainichi Pinjia Agent is the third generation of the SP3x family, which has sold more than 200 million units worldwide since 2010. The SP37 is a tire pressure sensor chip with a frequency range of 300 to 450 MHz. It integrates an internal sensor, single-chip microcomputer, and an RF transmit unit. The maximum output power is +8 dBm (50 Ω load), and the minimum operating voltage is 1.9 V. Its internal circuits include power filter circuits, crystal oscillator circuits, and antenna matching circuits.
Internally integrated sensor - Pressure sensor - Acceleration sensor - Temperature sensor - Battery voltage sensor Internally integrated peripheral resources - 8051 core - Flash memory - 3 GPIOs
- ADC
- 125KHz Low Frequency Receiver - 315/433MHz Transmitter 
Project features:
Sensor communication failure alarm time: ≤10min;
Battery Model: CR2450HR (Power: 550mAh);
RF frequency: 433.92±0.1MHz;
No radio frequency emission average operating current: ≤ 1μA;
RF emission maximum operating current: ≤15mA;
High frequency transmission power: 7 ~ 9dBm @ 50Ω;
High frequency modulation method: FSK (9.6Kbps);
Low frequency receiving frequency: 125±5 KHz;
Low-frequency reception 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;
Rotational acceleration: ≥1500g;
Operating temperature range: -40°C~+105°C;
Storage temperature range: -40°C~+125°C. 
