Melexis MLX90821 Relative Pressure Sensors

Melexis MLX90821 Relative Pressure Sensors are factory-calibrated relative pressure sensors that deliver a ratiometric analog output or a digital signal using the SENT protocol. MLX90821 features a MEMS sensor that enables reliable and accurate measurement of low pressures of a few tenths of millibars. These Melexis relative pressure sensors include an optimized architecture and high-density CMOS technology. These design features provide leading automotive electromagnetic compatibility (EMC) performance. The digital-signal-processor architecture uses a 16-bit microcontroller to provide high initial accuracy of pressure and optional external NTC temperature.


  • High accuracy relative pressure sensor
  • Ratiometric analog output or digital SENT output with available compensated ±1°C accurate NTC temperature information
  • System in a package
    • MEMS
    • Analog front-end circuitry
    • 16-bit microcontroller
    • Analog back-end circuitry
    • Voltage regulators
  • Automotive qualified and automotive diagnostic features
    • Clamping levels
    • Broken track diagnostics
    • Multiple internal fault diagnostics
  • Factory-calibrated or fully programmable through the connector for customized calibration curves
  • Backside exposed relative pressure sensor for higher resistance to common automotive media
  • Robust, easy-to-seal package 


  • Fuel vapor pressure sensors
  • Crankcase ventilation pressure sensors
  • Pressure sensors for filter monitoring


  • 18V supply voltage
  • -14V reverse voltage protection
  • 18V positive output voltage
  • -0.5V reverse output voltage
  • -40°C to +150°C automotive temperature range
  • -40°C to +125°C programming temperature range
  • 3.75bar burst pressure at room temperature

Functional Diagram

Block Diagram - Melexis MLX90821 Relative Pressure Sensors


Publicado: 2019-10-21 | Actualizado: 2023-06-05