Melexis

Smart IVT shunt interface current sensor

MLX91231
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  • Smart IVT shunt interface current sensor

The MLX91231 is a shunt interface for DC current sensing. It integrates IVT measurement capability (current, voltage and temperature), embeds a microcontroller and supports safety applications.

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Top 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)

Discover all features
Smart IVT shunt interface current sensor - MLX91231

Product description

The MLX91231 is a smart Shunt-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 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.

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

For engineering development the following tools are available:

Contact your local representative for more information.

Applications:

Shunt based primary and redundant current measurement (homogenous or heterogenous sensing technology):

  • 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

ASIL Readiness - Melexis

MLX91231 block diagram Melexis

Features and benefits

  • 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)

Documents and tools

Datasheet(s)
Product flyer(s)
Selection guide(s)
Environmental
IC handling and assembly

Videos

IC platform for DC current sensing (Shunt & Hall)

Product

Discover the MLX91230 (Hall) and MLX91231 (Shunt), DC current solution with high accuracy. They integrate IVT measurement capability, embed a microcontroller (MCU) and benefit from pre-installed safety features. The MLX91230 & MLX91231 are perfect for EV battery management and power distribution systems.

Related products

Development kit for the smart MLX91230
DVK91230
Development kit for the smart MLX91230
Development kit for the smart MLX91231
DVK91231
Development kit for the smart MLX91231
Smart IVT current sensor IC with +/-0.5% accuracy over temperature
MLX91230
Smart IVT current sensor IC with +/-0.5% accuracy over temperature

Practical applications

Application - 2-wheelers

2-wheelers

The current focus on electric vehicules is boosting the whole e-mobility industry. It is especially beneficial for the 2 and 3 wheelers which also require to solve similar constraints: from battery management (sufficient power, longevity and safety) to drive train efficiency and personalization.
Application - E-bike

E-bike

Combining exercise and mobility was never so easy thanks to E-bikes. Because they support you while moving, they are an attractive option. Modern technology optimizes the pedal assist by the electrical engine while minimizing the battery usage. Thanks to Melexis ICs you control the calories and the battery energy you burn.
Application - E-forklift

E-forklift

Industrial e-vehicles only function well if a number of sensors keep an eye on battery management, actuator positions and people safety around the vehicle. Melexis has been very industrious designing the right ICs for this market.
application Main DCDC thumbnail

main DCDC

The DC/DC converter produces low voltage DC electricity (e.g. 12 V, 14 V, 24 V) from the high voltage battery (e.g. 48 V up to 800 V) to supply the boardnet and charge the low voltage battery.
Application diagram onboard charger

Onboard charger

The function of the onboard charger is to efficiently, reliably and safely convert AC electricity from the electrical grid (e.g. household plug) to DC electricity so it can be stored in the battery of the electrified vehicle (xEV).

 
application thermal management PHEV thumbnail

PHEV thermal management

In order to optimize energy while increasing the All-Electric Range (AER), a perfect thermal management system is key. Melexis products enable higher system integration towards a safer and cost-effective thermal management, maximizing the AER and improving the driver experience.

 
Traction inverter and motor

Traction inverter & motor

In electric vehicles, the inverter converts DC power from the battery to AC power for the motor drive, which in turn transforms it into propulsion power. The efficiency of this system has a direct impact on the all-electric range, road performance and comfort.

 

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