Battery Management System Solution

The BMS solution supports multiple lithium-ion chemistries including LiCoO2 (LCO), LiFePO4 (LFP), LiMn2O4 (LMO), and NMC (LiNiMnCoO2). The cell voltage monitoring range of 0-5V accommodates all common lithium-ion chemistries. Configuration parameters include cell voltage limits, charging profiles, and temperature coefficients specific to each chemistry. The reference firmware includes profiles for common chemistries that can be customized for specific cell characteristics.

Select chemistry based on application requirements: LFP for safety and cycle life, NMC for energy density, LCO for consumer electronics. Contact our FAE team for chemistry-specific optimization.

Active cell balancing transfers energy from higher-voltage cells to lower-voltage cells using inductor-based or capacitor-based circuits. The PSS2416 monitors all cell voltages and identifies cells requiring balancing. The balancing circuit moves charge from cells above average voltage to cells below average voltage. This approach is more efficient than passive balancing (which dissipates energy as heat) and can achieve 5-10% improvement in usable pack capacity. The reference design supports up to 200mA balancing current.

Use active balancing for high-value systems where capacity improvement justifies additional cost. Use passive balancing for cost-sensitive consumer applications.

SOC estimation combines Coulomb counting (current integration) with voltage-based correction and temperature compensation. The high-accuracy current sensing (±0.5%) and voltage measurement (±1mV) enable SOC accuracy of ±2-3% under normal operating conditions. The algorithm includes Kalman filtering to minimize drift from Coulomb counting errors. Regular calibration at full charge resets accumulated errors. Temperature compensation adjusts for battery characteristics across -20°C to +60°C operating range.

SOC accuracy depends on measurement accuracy and calibration frequency. Implement periodic full-charge calibration for best accuracy. Contact our FAE team for SOC algorithm customization.

The BMS includes comprehensive safety protections: Overvoltage Protection (OVP) prevents cell overcharge at 4.25V (adjustable)

Undervoltage Protection (UVP) prevents over-discharge at 2.5V

Overcurrent Protection (OCP) limits charge/discharge current

Overtemperature Protection (OTP) prevents operation outside safe temperature range

and Short-Circuit Protection detects and responds to pack shorts within 1ms. All protections include configurable thresholds and time delays. Redundant protection circuits provide backup safety.

Configure protection thresholds based on cell manufacturer specifications. Always implement redundant protection for safety-critical applications. Contact our FAE team for safety certification support.

The BMS supports multiple communication interfaces: SPI for high-speed internal communication between BMS ICs

CAN bus for automotive and industrial network integration

UART for simple debugging and configuration

and ISO SPI for isolated communication in high-voltage systems. The CAN interface supports standard protocols including SAE J1939 for vehicles and Modbus for industrial applications. All interfaces provide access to cell voltages, temperatures, current, SOC, and fault status.

Use CAN for vehicle and industrial applications. Use UART for simple monitoring. Use ISO SPI for high-voltage isolated systems. Contact our FAE team for protocol implementation support.

The BMS consumes less than 100uA in sleep mode while maintaining cell monitoring and protection functions. In this mode, the MCU enters low-power state, ADC sampling rate reduces to 1Hz, and communication interfaces are disabled. The BMS wakes periodically to check cell status or can be awakened by external events such as charger connection or ignition signal. Low sleep current is critical for applications with long standby periods to prevent battery drain.

Sleep mode is automatically entered when no activity detected. Configure wake sources based on application requirements. Contact our FAE team for power optimization.