14 cells Battery Monitoring and balancing IC
L9963E chip for battery management systems
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
Home Energy Storage System 
Commercial Energy Storage System 
UPS (Uninterruptible Power Supply) 
Automotive 
eBike, eScooter How to test & prototype with L9963E
Choose a development kit to start testing the capabilities and features of L9963E:
EVAL-L9963E-MCU - L9963E Evaluation Board
Lonely or first stage of a BMS distributed system (with SPC574S64 MCU on board) allowing full L9963E evaluation.
EVAL-L9963E-NDS - L9963E single node in a distributed BMS System
Node in a distributed system (from the 2nd stage up to 32nd) allowing L9963E evaluation up to 800V battery pack
L9963T Companion chip - SPI to isolated SPI transceiver
A general-purpose SPI to isolated SPI transceiver intended to create a communication bridge between devices located into different voltage domains, the L9963T is able to transfer communication data incoming from a classical 4-wire based SPI interface to a 2-wire isolated interface (and vice-versa).
For buffering and decoupling the two different clock domains, the L9963T features an internal queue of 3 slots for the frames received on the SPI port and a queue of 20 slots for the ones received on the isolated SPI side.
Meet BMS performance requirements for your applications
Watch the on-demand webinar
Starting from a single lithium-ion cell and going towards a complete battery pack, you will explore how to manage the technological challenges of battery management using state-of-the-art semiconductor solutions.
Agenda overview
- Overview of hybrid/full-electric technologies
- Challenges for lithium-ion batteries including requirements and solutions for safe operation
- Cell monitoring and balancing: Why is it important and how it can be achieved?
- In-depth look at a state-of-the-art cell management solution
- ST's battery management portfolio and development ecosystem