Trade Shows
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| 26.02. - 28.02.2019, Nuremberg |
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.
Application examples:
Battery Terminal Sensor 12V/24V
Smart Battery Disconnect Unit, Junction Box or Power Relay Assembly
HV DC FastCharge current sensing
Battery Management System 48V/HV
Smart Pyrofuses
Zone controller
Enabling Battery State of Charge (SoC), State of Health (SoH) and State of Function (SoF)
Smart HV relays or contactors
Key features of the MLX91230:
▪ IVT battery measurements:
- Hall and/or 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
▪ Possible Automatic Gain Control (AGC) for higher dynamic range
▪ 16-bit MCU Memories:
- 32 KB Flash
- 128 B Flash Configuration Sector
- 20 KB ROM
- 2 KB RAM
- 512 B EEPROM
▪ Ambient temperature from -40°C to 125°C
▪ ISO 26262 ASIL compliant SEooC (Safety Element out of Context)
▪ 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
▪ Supply voltage: 4.5 to 18V (12V battery supply capability)
▪ Low level SW libraries provided by Melexis
▪ AEC-Q100 Grade 1 automotive qualified
▪ Overcurrent detection functionality (<500μs)
▪ Low current consumption (<21mA), programmable duty cycled sleep mode (RAM content maintained at <100µA)
▪ Magnetic sensing range of 512mT
▪ RoHS compliant package SOIC8 (DC)
▪ User programmable transfer characteristic
