Smallest Chip For Vehicle Tire Pressure Monitoring


A new tire pressure monitoring chip from Melexis not only claims industry-leading pressure accuracy to ensure that the vehicle runs on proper tyre pressure, but also draws the lowest current & takes up less board space than achieved with competing solutions.

“Offered in a robust 14-pin DFN type lead-less package, this product has a 60% smaller footprint and draws 3 times lower sleep mode current than any competing TPMS IC on the market.”

Utilising advanced tire pressure monitoring system (TPMS) technology, the MLX91804 features a sophisticated microcontroller and MEMS-based pressure sensing element, as well as energy efficient 315/433MHz wireless transmitter (supporting data rates up to 150kbits/s) and 125kHz receiver for communication with the vehicle’s relevant electronic control unit (ECU).

The chip also has a 16kB embedded program memory to store custom application data/libraries, and a built-in single or dual axis high-g range accelerometer to support all market available wheel sensor auto-location functionalities.


Battery size is minimized with the device’s low power consumption (in sleep mode as well as when fully operational). PCB size is also minimized with a smaller footprint.

Together with high-g range and fast data acquisition accelerometer, the chip is designed according 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, says the company.

Other benefits include a -40°C to 125°C operational temperature range and strong resilience to shock (10000g) which allow the MLX91804 to deal with a harsh in-tire environment.

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“Monitoring tire pressure is now an essential part of modern vehicle design. 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 3 times lower sleep mode power consumption figures than ICs from rival vendors”, states Ivan Zagan, Product Manager for TPMS at Melexis.

For further details, view the full Press release.



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