MLX91231 / 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.

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.

• IVT battery measurements:
  • Shunt based current sensor
  • Internal (PTAT) temperature sensor
  • Voltage measurement
• 16-bit MCU Memories:
  • 32 KB Flash
  • 128 B Flash configuration sector
  • 20 KB ROM
  • 2 KB RAM
  • 512 B EEPROM
• LIN/UART communication
• Overcurrent detection functionality (<500μs)
• 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)

• 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