Overview
The L9963E is a Li-ion battery monitoring and protecting chip designed by STMicroelectronics for high-reliability automotive applications and energy storage systems. It is capable of monitoring up to 14 stacked battery cells, making it suitable for 48 V and higher voltage systems. The device ensures high accuracy in cell voltage measurement and current monitoring through on-chip coulomb counting. It also supports the monitoring of up to seven external temperature sensors (NTCs) and features advanced communication interfaces, including SPI and isolated interfaces, for reliable data transmission.
Key Specifications
| Specification | Details |
|---|---|
| Part Number | L9963E, L9963E-TR |
| Marketing Status | Active |
| Package | TQFP 64 10x10x1.0 |
| Grade | Automotive Safety |
| RoHS Compliance Grade | Ecopack2 |
| Operating Temperature (°C) | -40 to 105 |
| Min Supply Voltage | 9.6V |
| Max Supply Voltage | 70V |
| ADC Resolution | 16-bit |
| ADC Error | ±2 mV in the [0.5 – 4.3] V range |
| Communication Interface | SPI, 2.66 Mbps isolated serial communication |
| Passive Balancing Current | 200 mA per cell |
| GPIOs | 9 GPIOs, with up to 7 analog inputs for NTC sensing |
Key Features
- AEC-Q100 qualified and full ISO26262 compliant, ASIL-D systems ready
- Measures 4 to 14 cells in series with 0 μs desynchronization delay between samples
- Coulomb counter supporting pack overcurrent detection in both ignition on and off states
- 16-bit voltage ADC with maximum error of ±2 mV in the [0.5 – 4.3] V range
- 2.66 Mbps isolated serial communication with regenerative buffer, supporting dual access ring
- 200 mA passive internal balancing current for each cell in both normal and silent-balancing mode
- Fully redundant cell measurement path with ADC Swap for enhanced safety and limp home functionality
- Intelligent diagnostic routine providing automatic failure validation and redundant fault notification
- Two 5 V regulators supporting external load connection with 25 mA (VCOM) and 50 mA (VTREF) current capability
- Robust hot-plug performance without the need for external Zener diodes
Applications
- Automotive: 48 V and high-voltage battery packs
- Backup energy storage systems and UPS
- E-bikes, e-scooters
- Portable and semi-portable equipment
Q & A
- What is the primary function of the L9963E chip?
The L9963E is a Li-ion battery monitoring and protecting chip designed for high-reliability automotive applications and energy storage systems.
- How many battery cells can the L9963E monitor?
The L9963E can monitor up to 14 stacked battery cells.
- What is the accuracy of the voltage measurement in the L9963E?
The voltage measurement accuracy is ±2 mV in the [0.5 – 4.3] V range.
- What communication interfaces does the L9963E support?
The L9963E supports SPI and 2.66 Mbps isolated serial communication.
- What is the passive balancing current capability of the L9963E?
The L9963E has a 200 mA passive internal balancing current for each cell in both normal and silent-balancing mode.
- Is the L9963E compliant with automotive safety standards?
Yes, the L9963E is AEC-Q100 qualified and full ISO26262 compliant, ASIL-D systems ready.
- How many GPIOs does the L9963E have?
The L9963E has 9 GPIOs, with up to 7 analog inputs for NTC sensing.
- What is the operating temperature range of the L9963E?
The operating temperature range is -40°C to 105°C.
- Does the L9963E support hot-plug functionality?
Yes, the L9963E has robust hot-plug performance without the need for external Zener diodes.
- What are some typical applications of the L9963E?
Typical applications include automotive 48 V and high-voltage battery packs, backup energy storage systems, e-bikes, e-scooters, and portable equipment.
