An automotive battery management system (BMS) is the “brain” of a an electric vehicle battery pack, and its performance greatly affects driving range and battery life of an electric vehicle. Renesas products are ideal for accurate and safe BMS applications.
This reference design operates as an example of a complete automotive battery management system for up to 70 series connected Li-ion cells. The RH850 microcontroller (MCU) communicates with the ISL78714 multi-cell Li-ion battery manager devices to monitor cell voltage, pack temperature and current, record significant fault detection, and control cell balance. The ISL78714 contains daisy chain hardware to provide robust, isolated communication between batteries. The RH850 can interface to multiple CAN, LIN, UART, and RS-485 buses and control multiple PWM outputs. The reference design is based of of the ISL78714BMS5XBEKIT1Z automotive-grade multi-cell Li-ion battery manager reference design kit.
System Benefits
- Best BMS accuracy and long-term drift (LTD), which extend driving range and battery life performance, with superior accuracy of 2mV and 6 sigma LTD
- Lowest BOM cost and best FuSa/EMI/EMC/hot-plug solution, which alleviates R&D effort and is easy to use with Renesas' RH850 MCU Family (with dedicated drivers and software for BMS)
- MCU line-up supporting functional safety features up to ASIL-D as well as required security features
- Intelligent power device (IPD) for external load control
- Complete assessment and development platform optimized for automotive battery management systems
System Block Diagram

Related Products
Product | Description | Featured Document | Ordering |
---|---|---|---|
Boards and Kits with MCU | |||
ISL78714BMS5XBEKIT1Z | Automotive-grade multi-cell Li-ion battery manager reference design kit | User's Manual Short User's Manual (NDA Necessary) |
Buy |
Microcontroller | |||
RH850/P1M | High-end microcomputer suitable for chassis systems that offers safety functions such as lockstep CPU, ECC, BIST (Built-in Self Test) and ECM (Error Control Module) | Select Document | Contact Sales |
Battery Management IC | |||
ISL78714 | Automotive-grade multi-cell Li-ion battery manager | Datasheet | Buy |
Power Management | |||
RAA270005 | Power management IC (PMIC) for the RH850/P1x (with built in voltage regulator for the MCU’s core) automotive microcontroller | Datasheet | Contact Sales |
Intelligent Power Devices (IPD) | |||
uPD166031A | 10mohm single-channel IPD with advanced protection method and high robustness against long term and repetitive short circuit condition | Datasheet | Contact Sales |
uPD166032 | 12mohm single-channel IPD with advanced protection method and high robustness against long term and repetitive short circuit condition | Datasheet | Contact Sales |
uPD166033 | 6mohm single-channel IPD with advanced protection method and high robustness against long term and repetitive short circuit condition | Datasheet | Contact Sales |
uPD166034 | 8mohm single-channel IPD with advanced protection method and high robustness against long term and repetitive short circuit condition | Datasheet | Contact Sales |
RAJ2800024 | 1.6mohm single-channel Automotive IPD with advanced protection method and high robustness against long term and repetitive short circuit condition | Datasheet | Contact Sales |
RAJ2800034 | 2.5mohm single-channel Automotive IPD with advanced protection method and high robustness against long term and repetitive short circuit condition | Datasheet | Contact Sales |
RAJ2800044 | 3.8mohm single-channel Automotive IPD with advanced protection method and high robustness against long term and repetitive short circuit condition | Datasheet | Contact Sales |
Photocoupler | |||
RV1S2752Q | Low input current transistor output photocoupler | Contact Sales | Contact Sales |