The ISL78714 automotive-grade Li-ion battery manager IC supervises up to 14 series connected cells and is optimized to meet stringent automotive performance, reliability, and safety requirements. The device provides all the functions expected of such a critical component in a battery management system, such as accurate cell voltage and temperature monitoring, cell balancing, and extensive system diagnostics. In a typical configuration, a master ISL78714 communicates to a host microcontroller through an SPI port and up to 29 additional ISL78714 devices connected together by a robust, proprietary, two-wire daisy chain. This communication system is highly flexible and can be implemented with capacitor isolation, transformer isolation, or a combination of both. Three cell balancing modes are included: Manual Balance mode, Timed Balance mode, and Auto Balance mode. Auto Balance mode terminates balancing after a host-specified amount of charge has been removed from every cell. The ISL78714 is packaged in a 64-pin TQFP and is specified for operation from -40 ºC to +105 ºC.

An NDA is required for the full datasheet. Please contact your local Renesas sales representative for more information.


  • Monitors and manages up to 14 cells; all standard Li-ion cell chemistries
  • AEC-Q100 qualified, supports ASIL D systems
  • Robust two-wire daisy chain communications system using a capacitor or transformer coupling at up to 1Mbps
  • High-coverage communication protocol based on ISO 26262
  • Cell voltage measurement accuracy 1.65V to 4.28V; -20 ºC to +85 ºC:
    • Initial Device accuracy: ±2mV
    • Post board assembly device accuracy: ±2.5mV
  • Cell input range: ±5.0V, negative voltages ideal for bus bars and fuel cells
  • Up to six external temperature monitoring inputs
  • Internal temperature monitoring with warning flag
  • Two general-purpose I/O pins
  • Automatic sensing of position in battery stack
  • Measures and performs read-back on all voltages, temperatures, and diagnostics for 112 cells in less than 10ms
  • User-selectable cell measurement averaging function
  • 14-bit voltage and temperature measurements
  • Integrated system diagnostics for all key functions
  • Watchdog shuts down device if communication is lost
  • Long term drift: -0.31 log(khrs)
  • Fully tolerant to EMC and transients – excellent Hot Plug performance
  • Available Complex Device Driver software follows AUTOSAR, Aspice, and ISO 26262 ASIL-D development processes
    • Configuration and integration of required MCAL modules provided by Renesas for the RH850 MCU




  • Automotive Battery Management Systems (BMS)
    • Battery Electric Vehicle (BEV)
    • Hybrid Electric Vehicle (HEV)
    • Plug-in Hybrid Electric Vehicle (PHEV)
  • Electric motorcycle battery packs
  • Backup battery and energy storage systems requiring high accuracy management and monitoring
  • Portable and semi-portable equipment


Type Title Date
Datasheet - Short-form PDF 208 KB
Brochure PDF 5.20 MB 日本語
Datasheet Log in to Download PDF 2.00 MB
White Paper PDF 451 KB 简体中文
White Paper PDF 451 KB 简体中文
Application Note PDF 389 KB
6 items

Design & Development

Software & Tools

Software & Tools

Software title
Software type
Automotive BMS Application Model & Software
BMS application models and software reduce the effort and time required to develop applications to estimate State Of Charge and State Of Health.
Software Package Renesas
1 item

Boards & Kits

Boards & Kits


Battery Management Solution for Electric Vehicles

In electric vehicles today, there are two key parameters, the state of health and the state of charge. Renesas' Battery Management Solution (BMS) device supports these parameters. This demonstration highlights Renesas' ISL78714 automotive-grade Li-ion battery manager IC and the RH850/P1M 32-bit automotive microcontroller (MCU). In addition to the ISL78714 battery manager IC and RH850 MCU, the demo board is supported by a host of other Renesas products including the RAA270005 power management IC (PMIC), RV1S2752Q photocoupler, and the uPD166031A/32/33/34 and RAJ2800024/34/44 integrated power devices (IPDs).