Overview
The L9963E is a Li-ion battery monitoring and protecting chip designed by STMicroelectronics for high-reliability automotive applications and energy storage systems. This device is capable of monitoring up to 14 stacked battery cells, making it suitable for 48 V and higher voltage systems. It ensures high accuracy in cell voltage measurement and current monitoring through on-chip coulomb counting. The L9963E also supports the monitoring of up to 7 NTCs (Negative Temperature Coefficients) and communicates via SPI or isolated interfaces. Multiple L9963E devices can be connected in a daisy chain, enabling high-speed, low EMI, and reliable data transmission with a host processor.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Global Supply Voltage (VBAT) | 9.6 | - | 70 | V |
| Cell Terminal Differential Voltage | 0 | - | 4.7 | V |
| Battery/High Terminal Differential Voltage | -0.3 | - | 61 | V |
| Voltage ADC Error | - | ±2 mV | - | mV |
| Operating Temperature Range | -40 | - | 105 | °C |
| Isolated Serial Communication Speed | - | 2.66 Mbps | - | Mbps |
| Passive Internal Balancing Current | - | 200 mA | - | mA |
| GPIOs | - | 9 | - | - |
Key Features
- AEC-Q100 qualified
- Monitors 4 to 14 cells in series with 0 μs desynchronization delay between samples. Supports 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.
- 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. 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 for hybrid (HE) and full electric (FE) vehicles.
- Backup energy storage systems and UPS.
- E-bikes, e-scooters.
- Portable and semi-portable equipment.
Q & A
- What is the L9963E used for? The L9963E is a Li-ion battery monitoring and protecting chip 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 ADC in the L9963E? The 16-bit voltage ADC has a maximum error of ±2 mV in the [0.5 – 4.3] V range.
- What communication interfaces does the L9963E support? The L9963E supports SPI communication and isolated interfaces.
- Can multiple L9963E devices be connected in a chain? Yes, multiple L9963E devices can be connected in a daisy chain and communicate with one host processor via transformer isolated interfaces.
- What is the passive internal balancing current of the L9963E? The L9963E has a 200 mA passive internal balancing current for each cell.
- Is the L9963E compliant with any safety standards? Yes, the L9963E is full ISO26262 compliant and 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 operation? Yes, the L9963E has robust hot-plug performance and does not require Zeners in parallel to each cell.
