Melexis MLX91231 Shunt-Based Smart IVT Battery Sensor

Melexis MLX91231 Shunt-Based Smart IVT Battery Sensor measures three physical quantities (current, voltage, and temperature) with a dedicated 32KB Flash memory on a single IC. This ASIL-compliant SOIC8 (DC) current sensor is ideal for safety applications. MLX91231 diagnostics remove part of the burden from the integrator in developing all the safety mechanisms, including on-chip overcurrent detection. The MLX91231 features ±0.25% accuracy over temperature (-40°C to +125°C) and over lifetime all-in, boosting the accuracy of Shunt DC current sensing. An integrated MCU enables automatic gain control to cover higher dynamic ranges, and onboard Flash memory supports custom software deployment and extensive compensation of system imperfections. Supplied with a regulated 5V or directly connected to a 12V battery, the MLX91231 outputs measurements and diagnostics either on a LIN bus or via UART.

Features

IVT battery measurements
- Shunt-based current sensor
- Voltage measurement
  - Internal dividers for 12V or 24V/48V batteries
  - External divider required for HV batteries
- Internal (PTAT) temperature sensor
16-bit MCU with 32KB Flash, 128B Flash CS, 20KB ROM, 2KB RAM, and 512B EEPROM memory
LIN/UART communication interfaces
- LIN physical layer compliant with ISO17987-4 and SAE J2602
- UART as CAN MCU bridge
- Wake up on LIN and UART or on an internal timer
Overcurrent detection functionality (<500μs)
Sensing range of 256mV
Possible Automatic Gain Control (AGC) for higher dynamic range
Low-level SW libraries provided by Melexis

User programmable transfer characteristic
4.5V to 18V supply voltage range (5V regulated supply or 12V battery supply capability)
Low current consumption (<21mA), programmable duty cycled sleep mode (RAM content maintained at <100μA)
Magnetic range from -100mV to 256mV
User programmable transfer characteristics
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 SOIC8 package (DC)

Applications

12V/24V battery terminal sensors
48V/HV battery management systems
- Primary current measurement
- Redundant current measurement (homogenous or heterogenous sensing technology)
- Diagnosable overcurrent detection
SoC/SoH/SoF + Rint (pre)calculations

Smart battery disconnect units, junction boxes, or power relay assemblies
Smart pyrofuses, HV relays, or contactors
HV DC FastCharge current sensors
Zone controllers
DC/DC converters
Power distribution units

Melexis MLX91231 Shunt-Based Smart IVT Battery Sensor

Features

Applications

Block Diagram

Functional Diagram

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