Description
The L9963E is a Li-ion battery monitoring and protecting 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 on-chip coulomb counting. The device can monitor up to 7 NTCs. The information is transmitted through SPI communication or isolated interface. Product status link L9963E Product summary

Features
■ AEC-Q100 qualified
■ Measures 4 to 14 cells in series, with 0 μs 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 ADC with maximum error of ±2 mV in the [0.5 – 4.3] V range, after soldering, in [-40; +105] °C Tj range
■ 2.66 Mbps isolated serial communication with regenerative buffer, supporting dual access ring. Less than 4 us latency between start of conversion of the 1st and the 31st device in a chain. Less than 4 ms to convert and read 96 cells in a system using 8 L9963E and L9963T transceiver. Less than 8 ms to convert and read 210 cells in a system using 15 L9963E and L9963T transceiver. Less than 16 ms to convert and read 434 cells in a system using 31 L9963E and L9963T transceiver. Supports both XFMR and CAP 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

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