Description
The L9963 is a Li-ion battery monitoring and protection chip 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. Each cell voltage is measured with high accuracy, as well as the current for the onchip coulomb counting. The device can monitor up to 7 NTCs. The information is transmitted through SPI communication or isolated interface. Multiple L9963 can be connected in a daisy chain and communicate with one host processor via the transformer isolated interfaces, featuring high-speed, low EMI, long distance, and reliable data transmission. Product status link L9963 Product label Product summary

Features
■ AEC-Q100 qualified
■ Measures 4 to 14 cells in series, with 0 us desynchronization delay between samples. Supports also busbar connection without altering cell results
■ Coulomb counter supporting pack overcurrent detection in both ignition on and off states. Fully synchronized current and voltage samples
■ 16-bit voltage measurement with maximum error of ±2 mV in the [1.7 – 4.7] V range, in whole operating temp range
■ 2.66 Mbps isolated serial communication with regenerative buffer, supporting dual access ring. Less than 2 µs latency between start of conversion of the 1st and the 15th device in a chain. Less than 4 ms to convert and read 96 cells in a system using 8 L9963. Supports both transformer and capacitive based isolation
■ 200 mA passive internal balancing current for each cell in both normal and silent-balancing mode. Possibility of executing cyclic wake-up measurements. Manual/Timed balancing, on multiple channels simultaneously; Internal/external balancing
■ Fully redundant cell measurement path, with ADC Swap, for enhanced safety and limp home functionality
■ Intelligent diagnostic routine providing automatic failure validation. Redundant fault notification through both SPI Global Status Word (GSW) and dedicated FAULT line
■ Two 5 V regulators supporting external load connection with 25 mA (VCOM) and 50 mA (VTREF) current capability
■ 9 GPIOs, with up to 7 analog inputs for NTC sensing
■ Robust hot-plug performance. No Zeners needed in parallel to each cell
■ Full ISO26262 compliant, ASIL-D systems ready
■ TQFP64EP package

Applications
■ 48 V and high-voltage battery packs
■ Backup energy storage systems and UPS
■ E-bikes, e-scooters
■ Portable and semi-portable equipment