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Melexis — MLX91231 Smart IVT Shunt Interface Current Sensor

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Melexis MLX91231 Smart IVT Shunt Interface Current Sensor

Part of the Gen 3 portfolio

The MLX91231 by Melexis is a smart Shunt-based current sensor and is part of the 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 MLX91231 is removing an important part of the burden from the integrator in developing all the safety mechanisms. That includes an on-chip overcurrent detection.

The MLX91231 comes with ±0.25% accuracy over temperature (-40℃ to 125℃) and over lifetime all-in. It is boosting the accuracy of Shunt DC current sensing. The integrated MCU enables automatic gain control to cover higher dynamic ranges. 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 MLX91231 outputs measurements and diagnostics either on a LIN bus or via UART.

Melexis’ MLX91231, in SOIC8 package, is tailored for DCDC converters, battery terminal sensors, low and high voltage power distribution and disconnection devices.

Features

  • IVT battery measurements:
    • Shunt based current sensor
    • Internal (PTAT) temperature sensor
    • Voltage measurement
      • Internal dividers for 12V or 24V/48V battery
      • External divider required for high voltage batteries
  • 16-bit MCU memories:
    • 32 KB Flash
    • 128 B Flash configuration sector
    • 20 KB ROM
    • 2 KB RAM
    • 512 B EEPROM
  • LIN/UART communication:
    • 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)
  • Possible Automatic Gain Control (AGC) for higher dynamic range
  • Ambient temperature from -40°C to 125°C
  • Supply voltage: 4.5 to 18V (regulated 5V or 12V battery supply capability)
  • Low current consumption (<21mA), programmable duty cycled sleep mode (RAM content maintained at <100µA)
  • Sensing range from -100mV to 256mV
  • ISO 26262 ASIL B(D) compliant SEooC (Safety Element out of Context)
  • AEC-Q100 Grade 1 automotive qualified
  • Low level SW libraries provided by Melexis
  • User programmable transfer characteristic
  • RoHS compliant package SOIC8 (DC)

Applications

  • 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)
  • Smart battery disconnect unit, junction box or power relay assembly

 

  • Smart Pyrofuses
  • Smart HV relays or contactors
  • HV DC FastCharge current sensing
  • Zone controller
  • Power distribution unit

 

Block Diagram

 

Melexis MLX91231 Smart IVT Shunt Interface Current Sensor

 

Melexis MLX91231 Diagram