TLE9012AQU multi-channel battery monitoring and balancing system IC performs multiple management and diagnostic functions for lithium ion battery packs used in automotive, industrial and consumer applications.
Each lithium monitoring and balancing IC monitor up to 12 cells in series with 12 dedicated high resolution (up to 16 bit configurable) sigma delta ADCs. The synchronized cell voltage measurements allow high accuracy measurement for SOC (State of Charge) and SOH (State of Health) calculation. Besides voltage measurement, it also supports 5 NTC temperature measurement channels.
It has 12 integrated balancing switches that allow up to 150mA balancing current per switch. As communication between the monitoring ICs and the MCU host is very important, the TLE9012AQU features a differential robust serial communication interface between the battery blocks and achieve communication robustness in the presence of 200mA bulk current injection test. The robust technology adopted in TLE9012AQU allows it to support hot plugging without using external clamping circuitry.
Features
General features
- Monitors up to 12 series connected cells
- Supports communication of up to 20 devices
- Supports hot plugging
Voltage measurement:
It provides a 16-bit temperature-compensated voltage measurement for each cell enabling high accuracy state of charge and state of health calculations, with a separate ADC for block voltage measurement
- 16 bit high-resolution ADC measurement for each cell
- Separate ADC for block voltage measurement
- High accuracy measurement for SoC (State-of-Charge) and SoH (State-of-Health) calculation
- Temperature compensated measurements
- Built in noise filtering
- Selectable measurement bit length
Temperature measurement:
The IC also offers 5 temperature measurement channels in addition to internal temperature measurement, enabling temperature-compensated voltage measurements.
- 5 temperature measurement channels for connection to external NTC
- Internal temperature measurement and monitoring
Balancing:
The device also has 12 built-in MOSFET switches that can be activated to balance each cell by dissipating energy into an external resistor.
- Passive balancing using integrated MOSFET switches and external resistors
- Integrated balancing switch allowing up to 150 mA balancing current
Communication Interface (iso UART):
A standard UART and Infineon proprietary iso UART interfaces support communication with more than 20 devices, with CRC secured communication and configuration registers.
- Standard UART and iso UART
- End-to-end CRC secured communication
- Differential robust serial interface for communication between battery blocks
- High speed communication up to 2 Mbps
- Power balanced communication scheme
Safety features:
The TLE9012AQU is an ISO-26262 ready device that can monitor up to 12 series-connected cells and supports hot plugging applications
- Two independent internal voltage references
- Block voltage measurement based on different ADC
- Configurable analog OV/UV comparators
- End-to-end CRC secured communication
- CRC secured configuration registers
- Internal open load detection
- Emergency mode for communication
- Green product (RoHS-compliant)
- AEC-Q100 qualified
- ISO-26262 ready, supporting ASIL-C BMS safety applications
- Monitors up to 12 series-connected cells
- Separate ADC for block voltage measurement
Target applications
Designed for Li-ion battery packs used in
- Hybrid electric vehicles (HEV),
- Plug-in electric vehicles (PHEV),
- Battery electric vehicles (BEV) ,
- Energy storage systems (ESS) ,
- Forklifts, ebikes and escooters.
Benefits
- Robust communication without need of transformers or common mode chokes
- State of the art voltage measurement accuracy even after soldering thanks to Stress sensor technology
- Integrated diagnosis easing Functional safety design
- Integrated UART communication for systems with a microcontroller on local ground
Diagram
Infineon Technologies’ TLE9012AQU battery monitoring and balancing IC TLE9012AQU