MLX91230
Smart IVT Sensor IC
Datasheet
REVISION 1.0 – SEPT 12, 2023
1. Features and Benefits
▪ IVT battery measurements:
o Hall based current sensor
o Voltage measurement
▪ Internal dividers for 12V or 24V/48V batteries
▪ External divider required for HV batteries
o 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
o LIN Physical Layer compliant to
ISO17987-4 and SAE J2602
o UART as CAN MCU bridge
o Wake-up on LIN and UART or on internal
timer
▪ Overcurrent detection functionality (<500µs)
▪ Magnetic range of 512mT
▪ Possible Automatic Gain Control (AGC) for
higher 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)
2. Application Examples
▪ Battery Terminal Sensor 12V/ 24V
Battery Management System 48V/ HV
o Primary current measurement
o Redundant current measurement
(homogenous or heterogenous sensing
technology)
o Diagnosable Overcurrent Detection
▪ SoC/ SoH/ SoF + R
int
(pre)calculations
▪ Smart Battery Disconnect Unit, Junction Box
or Power Relay Assembly
▪ Smart Pyrofuses
▪ Smart HV relays or contactors
▪ HV DC FastCharge current sensor
▪ Zone controller
3. Description
The MLX91230 is the first smart Hall-based current
sensor and is part of Melexis Gen3 portfolio. With a
measurement capability of three physical quantities:
Current, Voltage and Temperature, Overcurrent
detection alongside a dedicated 32 KB Flash memory
on a single IC, this ASIL-compliant chip 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. The MLX91230 comes with 0.5%
accuracy over temperature (-40°C to 125°C) for a 1%
lifetime drift all-in, hence boosting the accuracy of
Hall-effect DC current sensing. The IC’s MCU enables
automatic gain control to cover higher dynamic
ranges, and its on-board flash memory supports
custom software, extensive compensation of system
imperfections and low power modes. Supplied with a
regulated 5V or directly connected to the 12V
battery, the MLX91230 outputs measurements and
diagnostics either on LIN bus or via UART.
MLX91230
Smart IVT Sensor IC
Datasheet
Page 2 of 28
REVISION 1.0 –SEPT 12, 2023
Contents
1. Features and Benefits ......................................................................................................... 1
2. Application Examples .......................................................................................................... 1
3. Description ......................................................................................................................... 1
4. Ordering Information .......................................................................................................... 3
5. Functional Diagram ............................................................................................................. 4
6. Functional Safety ................................................................................................................ 4
7. References .......................................................................................................................... 4
8. Glossary of Terms ............................................................................................................... 5
9. Pin description, Pin Definitions and Pinout ......................................................................... 6
10. Maximum Ratings ....................................................................................................... 6
11. Normal Operating Ranges ........................................................................................... 8
12. General Timing Specification ...................................................................................... 9
13. Analog Front End ...................................................................................................... 10
13.1. Linear current measurement ................................................................. 10
13.2. Automatic gain control ........................................................................... 11
13.3. Overcurrent detection ........................................................................... 12
PWM digital OCD on TX_OCD pin .......................................................... 14
PWM digital OCD on LIN_OCD pin ......................................................... 16
13.4. VSENSE voltage measurement .............................................................. 17
LVBAT (12V) measurement .................................................................... 17
HVBAT (24V/48V) measurement ........................................................... 17
Direct voltage (HV) measurement ......................................................... 18
13.5. Internal die Temperature measurement .............................................. 19
13.6. VDD voltage measurement .................................................................... 19
14. Electrical specifications ............................................................................................. 20
14.1. UART ........................................................................................................ 20
RX ............................................................................................................. 20
TX ............................................................................................................. 20
14.2. Supply system ......................................................................................... 20
14.3. Internal Clock Generation ...................................................................... 21
15. Recommended Application Diagrams ....................................................................... 22
15.1. Resistor and Capacitor Values for LIN and UART communications ..... 22
15.2. OCD external circuit example (PWM) .................................................... 24
16. Package, IC handling and assembly ........................................................................... 25
16.1. Package information .............................................................................. 25
16.2. Storage and handling of plastic encapsulated ICs ................................ 26
16.3. Assembly of encapsulated ICs ................................................................ 27
16.4. Environment and sustainability ............................................................. 27
17. Revision History Table ............................................................................................... 28
18. Disclaimer ................................................................................................................. 28