Renesas Eases Development of BMS for EVs

Article By : Renesas Electronics Corp.

Renesas' AUTOSAR-compliant complex device driver software module complements its battery manager IC to enable ASIL D-Compliant designs.

Renesas Electronics Corp. has launched an AUTOSAR-compliant complex device driver (CDD) software module for designers of automotive battery management systems (BMS) in electric vehicles (EVs). The new software pairs with Renesas’ ISL78714 Li-Ion battery management IC to speed design and optimize performance of next-generation systems.

The CDD software is designed to work with Renesas’ Winning Combination BMS reference design hardware kit, which includes the ISL78714 IC and the RH850/P1M MCU. The CDD includes configuration and integration of required microcontroller abstraction layer (MCAL) modules provided by Renesas for the RH850 MCU. It provides an entire low-level software solution for collecting battery cell voltage and temperature measurements and controlling cell balancing functions of the ISL78714. Configurable parameters determine the number of cells in the BMS system and the desired rate of battery cell data collection.

The CDD software has a simple but full-featured API that allows the end-user’s application software to receive battery cell measurements in real time. Software interfaces and protocol management needed to operate the ISL78714 are built into the CDD software and operate on top of existing lower-level SPI, GPIO, and General Purpose Timer (GPT) drivers included in the MCAL modules. The CDD software provides customers with a practical architecture for simplifying their software design and allows them to focus efforts on their unique application features.

The new ISL78714 CDD software follows ISO26262 ASIL D (the highest level of automotive functional safety) development processes. The RH850/P1M MCU and MCAL modules also achieve ASIL D. The ISL78714 CDD software, as a template for successful ASIL D software development, is an enormous asset. Customers who desire assistance with their design can work under contract with Renesas partner TATA Elxsi to develop their system.

“As the EV market continues to expand rapidly, battery management is a critical element in the success of new vehicles,” said Niall Lyne, Vice President of the Automotive Analog Power and Video Business Division at Renesas. “The Renesas ISL78714 IC combined with our new CDD software helps our customers get the best performance possible out of their battery management systems, reduces their development schedule, and simultaneously eases the difficult process of meeting stringent ASIL D safety requirements.”

“The unique features of the Renesas ISL78714 battery management IC, combined with the new CDD software, offer a powerful platform to develop our integrated BMS,” said Chris Klesyk, Vice President, Battery Management for Our Next Energy. “This technology partnership is foundational for ONE’s immediate BMS needs and offers a path for future enhancements.”

 

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