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Melexis MLX91230 Hall-Based Current Sensor

The Melexis MLX91230 is the first smart Hall-based current sensor and is part of Melexis’ Gen 3 portfolio. With a measurement of three physical quantities (current, voltage and temperature) and a dedicated 32 KB Flash memory on a single IC, this ASIL compliant product is ideal for safety applications. With its diagnostics the MLX91230 is removing an important part of the burden from the integrator in developing all the safety mechanisms. That includes an on-chip overcurrent detection.

As battery metrics such as State of Charge (SoC), State of Health (SoH) and State of Function (SoF) are directly linked to EV range, high current sensing accuracy is a key factor in these calculations. The MLX91230 comes with +/-0.5% accuracy over temperature (-40℃ to 125℃) for a +/-1% lifetime drift all-in. The MCU enables automatic gain control to cover higher dynamic ranges, and the on-board flash memory supports custom software deployment and extensive compensation of system imperfections. Supplied with a regulated 5V or directly connected to the 12V battery, the MLX91230 in SOCI8 provides measurements and diagnostics either on a LIN bus or via UART.


  • IVT battery measurements:
    • Hall based current sensor
    • Voltage measurement
    • Internal (PTAT) temperature sensor
  • 16-bit MCU with 32 KB Flash, 128 B Flash CS, 20 KB ROM, 2 KB RAM and 512 B EEPROM Memory
  • LIN/UART communication interfaces
    • LIN Physical Layer compliant to ISO17987-4 and SAE J2602
    • UART as CAN MCU bridge
    • Wake-up on LIN and UART or on internal timer
  • Overcurrent detection functionality (<500µs)
  • Magnetic range of 512mT
  • Possible Automatic Gain Control (AGC) for higher dynamic range
  • Low level SW libraries provided by Melexis
  • User programmable transfer characteristic
  • Supply voltage: 4.5 to 18V (12V battery supply capability)
  • Low current consumption (<21mA), programmable duty cycled sleep mode (RAM content maintained at <100µA)
  • Ambient temperature from -40°C to 125°C
  • ASIL compliant SEooC (Safety Element out of Context) according to ISO26262
  • AEC-Q100 Grade 1 automotive qualified
  • RoHS compliant package SOIC8 (DC)


  • Battery Terminal Sensor 12V/ 24V
  • Battery Management System 48V/ HV
  • Enabling Battery State of Charge (SoC), State of Health (SoH) and State of Function (SoF)
  • SoC/ SoH/ SoF + Rint (pre)calculations
  • Smart Battery Disconnect Unit, Junction Box Or Power Relay Assembly
  • Smart Pyrofuses
  • Smart HV relays or contactors
  • HV DC FastCharge current sensor
  • Zone controller


Melexis MLX91230 Block Diagram

Melexis MLX91230 Block Diagram


Development Kit for the Smart MLX91230

The DVK91230 provides a mother board and a sensor board to enable comprehensive performance evaluation of the MLX91230’s capabilities. Note that a Melexis Universal Master MUM (not included) is also required.

The DVK91230 includes:

  • Mother board: junction between the MUM Programmer (not included in the DVK) and the sensor board
  • Sensor board: ready to use with a MLX91230 already soldered
  • Connectors: between mother board and MUM programmer, between mother board and sensor board
  • Copper busbar
  • Ferromagnetic core
  • Plastic holder (to fix the core, sensor board and busbar)
  • Spare MLX91230 ICs (x2)


Development kit for the smart MLX91230


Development kit for the smart MLX91230 - DVK91230

Key Features

  • Simplify the evaluation of the MLX91230
  • Low level software libraries available
  • GUI (Graphical User Interface) starter toolbox for calibration and measurement
  • Hardware reference design available
  • Melexis IDE (Integrated Design Environment)



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