battery management system

L9963E chip for battery management systems

Automotive chip for battery management applications with daisy chain up to 31 devices

A Li-ion battery monitoring and balancing chip, the L9963E is designed for high-reliability automotive applications and energy storage systems. Up to 14 stacked battery cells can be monitored to meet the requirements of 48 V and higher voltage systems as it is possible to daisy chain multiple (up to 31) devices ensuring high-speed, low EMI, long distance, and reliable data transmissions. In addition to a fully redundant cell measurement path, with ADC Swap, for enhanced safety and Limp Home functionality, the L9963E offers an intelligent diagnostic routine providing automatic failure validation.


Key features of L9963E

  • Measures 4 to 14 cells in series
  • On board Coulomb counter supporting pack overcurrent detection in both ignition on and off states
  • 16-bit voltage ADC with maximum error of ±2 mV in 0 to 4.3 V range
  • 2.66 Mbps isolated serial communication with dual access ring capability

  • Less than 4 µs latency between start of conversion of the 1 and the 31st device in a chain
  • 200 mA passive internal balancing current for each cell
  • Two 5 V regulators supporting external load
  • 9 GPIOs, with up to 7 analog inputs for NTC sensing

Application examples

Commercial energy storage system
eBike, eScooter
Home energy storage system

How to test and prototype with L9963E


EVAL-L9963E-MCU: L9963E BMS IC evaluation board
Evaluation board

The EVAL-L9963E-MCU is a hardware tool for evaluation of L9963E, automotive chip for battery management applications. It can be used for the development of a 48 V battery management system (BMS) or as lower stage of a distributed BMS (depending on total battery voltage. Additional stages can be added thanks to EVALL9963E-NDS).

AEK-POW-BMS63EN: battery management system module based on L9963E
Evaluation board

The AEK-POW-BMS63EN is a battery management system (BMS) evaluation board that can handle from 1 to 31 Li-ion battery nodes. Each battery node manages from 4 to 14 battery cells, for a voltage range between 48 V and 800 V.


STSW-L9963E: L9963E evaluation Graphical User Interface (GUI)

The STSW-L9963E is the PC Graphical User Interface (GUI) dedicated to set and control EVAL-L9963E-MCU hardware tool for evaluation of L9963E automotive chip for battery management applications.

Automotive general purpose SPI to isolated SPI transceiver

L9963T is a general purpose SPI to isolated SPI transceiver intended to create a communication bridge between devices located into different voltage domains. L9963T is able to transfer communication data incoming from a classical 4-wire based SPI interface to a 2-wire isolated interface (and viceversa).


Overcoming design challenges for battery management systems
On-demand webinar

Become familiar with the basic concepts of BMS in various applications

Webinar overview
  • Basic concepts of battery management systems in various applications,
  • Measuring a battery cell’s State of Charge (SoC) and State of Health (SoH) to better optimize their performance,
  • Overview of ST’s portfolio and developer resources for designing a state-of-the-art BMS,
  • Pros and cons of various topologies and design choices for typical use cases.