The reason is that there is no good match in the later period:
< br >
1, the pressure monitoring sensor can change the battery itself. Tire pressure monitoring has become an essential vehicle electronic configuration, many tire pressure monitoring equipped with external sensors, the external sensor will generally install a CR1632 specification battery, normal use of 2-3 years no problem, more than 2 years after the battery ran out;
< br >
2, TPMS tire module contains components MEMS pressure sensor, temperature sensor, voltage sensor, accelerometer, microcontroller, RF circuit, antenna, LF interface, oscillator and battery. Automakers require batteries with direct TPMS to last more than a decade. The operating temperature of the battery must be -40°C to 125°C, light weight, small size and large power;
< br >
3, because of these limitations, the battery is often chosen to be a button battery rather than a large battery. The new button battery can reach the standard 550mAh power and weighs only 6.8 grams. In addition to batteries, to achieve an operating life of more than ten years, components must have integrated functions while consuming low power;
< br >
4. This type of integrated product integrates pressure sensor, temperature sensor, voltage sensor, accelerometer, LF interface, microcontroller and oscillator into one component. The complete tire module system has only three components - the SP30, the RF transmitter chip (such as Infineon's TDK510xF) and the battery.