Melexis continues to make major advances in TPMS (Tire Pressure Monitoring System) technology with the introduction of its 3rd gen TPMS IC, the MLX91804. The device is supplied in a robust 14-pin DFN type lead-less package and, according to the company, has a 60% smaller footprint and draws three times lower sleep mode current than any competing TPMS IC on the market.
The MLX91804 incorporates a sophisticated MCU and MEMS-based pressure sensing element, as well as energy efficient 315/433MHz wireless transmitter (supporting data rates up to 150kb/s) and 125kHz receiver for communication with the vehicle’s relevant ECU. A 16kB embedded programme memory is included for the storing of custom application data/libraries. In addition, there is a built-in single or dual axis high-g range accelerometer to support all market available wheel sensor auto-location functionalities.
The combination of minimal footprint and high degrees of integration offered by the MLX91804 means that a significant reduction in PCB size can be realised. Likewise, the device’s low power consumption (in sleep mode as well as when fully operational) permits a downsizing of the specified battery. All this results in a smaller size and lower weight sensor module. Together with high-g range and fast data acquisition accelerometer, it also represents a step closer to the Tire Mounted Sensor (TMS) implementations that automotive Tier 1 suppliers are looking to use in the future. Best in class precision and low power fast pressure measurements allow extra new features to be implemented like tire filling assistant without a visible impact on battery life. The -40 to 125°C operational temperature range and strong resilience to shock (10,000g) allow the MLX91804 to deal with a harsh in-tire environment.
Ivan Zagan, Product Manager, TPMS, Melexis, commented: “Monitoring tire pressure is now an essential part of modern vehicle design. Global uptake of TPMS is increasing all the time, driven by international regulations and increasing emphasis on the safety of road users. The attributes shown by the MLX91804 will facilitate the next generation of TPMS deployment in automobiles, as it needs just half the board real estate and delivers three times lower sleep mode power consumption figures than ICs from rival vendors. This cutting-edge device will enable more compact solutions with greater functionality and improved energy efficiency, in line with vehicle manufacturers’ growing expectations. We are pleased to see a growing interest among major players for this technology.”