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Software module simplifies development of battery management systems

Software module simplifies development of battery management systems

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By Christoph Hammerschmidt



Renesas Electronics Corporation has introduced an Autosar-compliant complex device driver (CDD) software module for electric vehicle battery management system (BMS) designers. Tailored for the ISL78714 Li-ion BMS chip, it helps accelerate development and optimise system performance.

The CDD software is designed for Renesas’ BMS reference design hardware kit, one of Renesas’ “Winning Combinations” that includes the ISL78714 IC and RH850/P1M MCU. The CDD software includes configuration and integration of the required MCAL (Microcontroller Abstraction Layer) modules that the manufacturer provides for the RH850 MCU. It provides a complete low-level software solution for acquiring voltage and temperature measurements of the battery cells and controlling the cell balancing functions of the ISL78714. Configurable parameters can be used to define the number of cells in the BMS system and the desired frequency of battery cell data collection.

The software has an API that allows the end user’s application software to acquire battery cell measurements in real time. The software interfaces and protocol management functions required for the operation of the ISL78714 are integrated into the software. They run in addition to the SPI, GPIO and GPT (general purpose timer) drivers included in the MCAL modules. The promise Renesas makes with the CDD software offering: It is to provide customers with a practical architecture for easier software design and allow them to focus on developing their specific application functions.

The ISL78714 CDD software complies with ISO26262 ASIL D (the highest level of automotive functional safety) development processes, as do the RH850/P1M MCU and MCAL modules. Together with the ISL78714 CDD software, these provide a valuable foundation for successful ASIL D software development. Customers who want assistance with their design can work with Renesas partner TATA Elxsi to develop their system.

“As the electric vehicle market continues to grow rapidly, battery management is a critical element to the success of new vehicles,” explains Niall Lyne, vice president of the Automotive Analog Power and Video Business Division at Renesas. “Renesas’ ISL78714, combined with our new CDD software, helps our customers get the best possible performance from their battery management systems and shorten their development timelines. At the same time, the solution simplifies the difficult process of meeting stringent ASIL-D safety requirements.”

Renesas’ CDD software and BMS reference design hardware kit (ISL78714BMS5XBEKIT1Z) are available now to qualified customers.

www.renesas.com/isl78714

 

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