STMicroelectronics L99BM114 Multicell Battery Monitoring/Balancing IC
STMicroelectronics L99BM114 Multicell Battery Monitoring/Balancing IC is a Li-ion battery monitoring and protecting chip for high-reliability industrial applications and energy storage systems. Up to 14x stacked battery cells can be monitored to meet the requirements of 48V and higher voltage systems. Each cell voltage is measured with high accuracy, as well as the current for the onchip coulomb counting. The device can monitor up to seven NTCs, and information is transmitted through SPI communication or an isolated interface.
Up to 31x L99BM114 can be connected in a daisy chain and communicate with one host processor via the transformer or capacitive isolated interfaces, featuring high-speed, low EMI, long distance, and reliable data transmission. Passive balancing with programmable channel selection is offered in standard and low-power modes (silent balance).
The balancing can be terminated automatically based on an internal timer interrupt. Nine GPIOs are integrated for external monitoring and control, and up to seven of them can be configured for pack temperature monitoring via NTC. The STMicroelectronics L99BM114 features a comprehensive set of fault detection and notification functions to meet system safety standard requirements.
Features
- 4x to 14x series cells battery monitoring and balancing
- 64V operating voltage
- Supports busbar connection without altering cell results
- Independent 16-bit voltage ADC for each channel with an accuracy of less than 2mV
- 18-bit ADC current measurement with a coulomb counter
- Fully synchronized current and voltage samples
- Intelligent diagnostic routine providing automatic failure validation, redundant fault notification through both SPI Global Status Word (GSW) and the dedicated FAULT line
- 9x GPIOs, with up to 7x analog inputs for NTC sensing
- Internal passive balancing up to 200mA with a possibility to drive external balancing transistors
- 2.66Mbps isolated serial communication or up to 5MHz SPI
- 2x 5V regulators supporting external load connection with 25mA (VCOM) and 50mA (VTREF) current capability
- Embedded NVM for customer parameters storage
- System safety ready
- 64-pin TQFP package
- -40°C to +105°C operating and testing temperature range
Applications
- 48V and high-voltage battery packs
- Backup energy storage systems and UPS
- E-bikes and e-scooters
- Portable and semi-portable equipment
Typical Application
Block Diagram
Device operation in the VBAT supply voltage ranges
Related Transceiver
STMicroelectronics L99BM1T SPI-to-Isolated SPI Transceiver
Creates a communication bridge between devices in different voltage domains.
Dev Tools
STMicroelectronics STEVAL-BMS114 BMS Evaluation Board
Operates from 1 to 31 Li-ion battery nodes & supplies to sense each cell's voltage, current, & temp.
STMicroelectronics STEVAL-BMS114TX BMS Evaluation Board
The board operates from 4 to 14 battery cells and uses the L99BM1T embedded transceiver.
STMicroelectronics STEVAL-BMS1T SPI to Isolated SPI Dongle
Allows SPI signals to be converted into isolated SPI signals, decreasing wires from four to two.
Complete Your Design
STMicroelectronics Standard Products
A broad range of drop-in replacements for general-purpose analog ICs, discretes, and serial EEPROMs.