Tyre pressure sensor with intelligent features for pressure monitoring systems

Infineon Technologies AG has combined its automotive expertise with its patented glass-silicon-glass MEMS sensor for the automotive tyre pressure monitoring system (TPMS) market to launch the XENSIV SP49 tyre pressure monitoring sensor. The sensor combines MEMS sensors and ASIC, providing smart tyre features that allow advanced tyre pressure monitoring systems. It provides a powerful 32-bit Arm M0+ core, a large flash memory and RAM, Low Power Monitoring (LPM), and optimised fast acceleration sensing. The SP49 is ideal for intelligent tyre functions such as on-tyre auto-position sensing, tyre inflation assistance, tyre blowout detection, and load detection.

The device is a pin-to-pin replacement for the company's previous generation SP40 TPMS products. With its hardware master/slave I²C interface and software-simulated UART, SPI and PWM interfaces, the SP49 is ideal for sub-1GHz and scalable for BLE TPMS. Obtainable at ASIL-A, the sensor provides a high level of integration and is optimised to perform all functions needed to implement a modern TPMS module. With its integrated microcontroller, sensors and convenient peripherals, the device needs only a few passive components to form a complete TPMS sensor unit. The device is developed for low power consumption, making it excellent for battery-powered applications.

As well as the ability to generate a wake-up from the integrated interval timer, the products are ideal for stand-alone remote pressure sensing solutions that need low power consumption. In these applications, the LF receiver with wake-up capability and best-in-class sensitivity facilitates on-demand measurements.