As automated driving technology expands, it becomes increasingly important to consider a fail-operational system to keep the intended functionality of the vehicle, even in the event of a fault in the vehicle system. While conventional functional safety allows for failure detection and establishing a safe state for the vehicle, it is insufficient for responding to failure events when considering a fail-operational system.

The S-19193 Series can continue monitoring the battery cell when it is overcharged and overdischarged through the standalone operation without micro controlling. Even in case of the main monitoring system failure, it can continue the battery monitoring function and realize the fail-operational BMS.

Automotive BMS in EVs, e-bikes, and similar applications are required to comply with ISO26262. High-level functional safety levels, ASIL-C and ASIL-D, are required for functions that detect hazardous conditions, such as battery overcharging and overdischarging.

The S-19193 Series is a functional safety-compliant production developed according to a process that adheres to ISO26262. It achieves an ASIL-B(D) classification based on specific use case assumptions. By using the current monitoring circuit as the primary monitoring system and configuring the secondary monitoring system with this IC, the BMS can achieve ASIL-D classification by applying ASIL decomposition.

The S-19193 Series has a self-diagnostic (self-test) function that can detect the failure of the internal IC simply by inputting the RSTI signal from an external source. By using the self-test function, the IC can report the failure of the monitoring function to the system even if it loses the overcharged and overdischarged monitoring functions due to a ‘random failure’ which is likely to occur after prolonged use of the IC.

The S-19193 Series features a cascade connection function, allowing it to manage and monitor 7 or more cells.
In addition to the direct connection method, it also supports the other connection method using a photocoupler to connect to adjacent modules, enabling the configuration of a safety monitoring circuit in high-voltage BMS systems with a large number of stacked cells.