Smart IVT current sensor IC with +/-0.5% accuracy over temperature
The MLX91230 senses DC current. It integrates IVT measurement capability, embeds a microcontroller and supports safety applications. It is ideal for EV battery management and power distribution systems.
The 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.
HALL-BASED DC CURRENT SENSING WITH UNPRECEDENTED ACCURACY
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. Boosting accuracy of Hall-effect DC current sensing, the MLX91230 comes with 0.5% accuracy over temperature (-40°C to 125°C) 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 and extensive compensation of system imperfections. Supplied with a regulated 5V or directly connected to the 12V battery, the MLX91230 in SOIC8 outputs measurements and diagnostics either on LIN bus or via UART.
Features and Benefits
- IVT battery measurements:
- Hall 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 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) forhigher 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)
Application Examples
- 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
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.
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.
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.
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.
