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.

Features

  • Monitors and manages up to 14 cells; all standard Li-Ion cell chemistries
  • Supports ASIL D systems
  • Robust two-wire daisy chain communications system using a capacitor or transformer coupling at up to 1Mbps
  • High-security communications protocol per ISO26262
  • 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
  • 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
  • Pb-free (RoHS compliant)
  • Long term drift: -0.31 log(khrs)
  • Fully tolerant to EMC and transients

Applications

  • Hybrid Electric Vehicle (HEV)
  • Plug-in Hybrid Electric Vehicle (PHEV)
  • And Electric Vehicle (EV) battery packs
  • Electric motorcycle battery packs
  • Backup battery and energy storage systems requiring high accuracy management and monitoring
  • Portable and semi-portable equipment

descriptionDocumentation

Title language Type Format File Size Date
star ISL78714 Short-Form Datasheet Datasheet - Short-form PDF 123 KB
ISL78714 Datasheet Request Datasheet 0 KB
AN1975: Use of Optocouplers in Battery Management Systems Application Note PDF 389 KB
Putting Safety into Li-ion Battery Packs 简体中文 White Paper PDF 451 KB
Battery Management System Tutorial 简体中文 White Paper PDF 451 KB
Analog ICs Brochure 日本語 Brochure PDF 4.20 MB

memoryBoards & Kits

Part Number Title Type Company
ISL78714BMS5XBEKIT1Z Automotive Grade Multi-Cell Li-Ion Battery Manager Reference Kit Reference Renesas
ISL78714XB-EVKIT1Z Automotive Grade Multi-Cell Li-Ion Battery Manager Evaluation Kit Evaluation Renesas