The MLX91805 is a smart tire sensor integrating an 800g XZ-axis accelerometer sensing up to 10,000 samples per second, a high-accuracy pressure sensor as well as a temperature and voltage sensors.

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Top features

  • 800 g XZ-axis accelerometer, sensing up to 10,000 samples per second

  • Tiny 4 mm x 5 mm wettable flanks DFN-14 package

  • Ultra-low power operation from 3.6 V down to 1.8 V

    • 90 nA sleep current (LFO and timer running, memory retention)

  • Power efficient 315/433 MHz RF transmission up to 150 kbps data rate

  • Pressure measurement ranges: 100 - 900 kPa and 100 - 1,400 kPa

  • 16-bit RISC MCU with coprocessor including:

    • 16 KB FLASH, 512 B SRAM, 64 B NVRAM

    • 47 B register memory (On during sleep)

    • 3 GPIOs

  • Ultra-low power LFO and wake-up scheduler

  • Built-in diagnostics and fault detection

  • - 40 to 135 °C operating temperature range

  • Automotive qualified

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Smart tire sensor - MLX91805

Product description

The MLX91805 is a highly integrated System in a Package (SIP) combining an 800g XZ-axis accelerometer that senses up to 10,000 samples per second and pressure sensors with an ultra-low-power sensor interface under control of 16-bits RISC MCU in a custom, pressure ported plastic DFN14 package.

Wireless communication is ensured by an embedded 315/433 MHz RF transmitter and 125 kHz LF transceiver. Together with a few external components and a battery the MLX91805 is the most optimal solution for smart tire sensor applications.

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MLX91805 Block Diagram

Features and benefits

  • 800 g XZ-axis accelerometer, sensing up to 10,000 samples per second

  • Tiny 4 mm x 5 mm wettable flanks DFN-14 package

  • Ultra-low power operation from 3.6 V down to 1.8 V

    • 90 nA sleep current (LFO and timer running, memory retention)

  • Power efficient 315/433 MHz RF transmission up to 150 kbps data rate

  • Pressure measurement ranges: 100 - 900 kPa and 100 - 1,400 kPa

  • 16-bit RISC MCU with coprocessor including:

    • 16 KB FLASH, 512 B SRAM, 64 B NVRAM

    • 47 B register memory (On during sleep)

    • 3 GPIOs

  • Ultra-low power LFO and wake-up scheduler

  • Built-in diagnostics and fault detection

  • - 40 to 135 °C operating temperature range

  • Automotive qualified

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The MLX91805 smart tire sensor

Product

The MLX91805 smart tire sensor helps OEMs prepare for the forthcoming extension of mandatory tire pressure monitoring to include commercial heavy-duty vehicles, and to enable future generations of smart tires.