Battery Management Systems

Renesas’ functional blocks vary widely from an analog front-end requiring a MCU to a standalone solution that runs autonomously

Image of Renesas’ Winning Combination - Battery Management SystemsRenesas’ winning combination battery management systems (BMS) can be comprised of many functional blocks, including cutoff FETs, a fuel gauge monitor, cell voltage monitor, cell voltage balance, real-time clock (RTC), temperature monitors, and a state machine.

There are many types of battery management ICs available. The grouping of the functional blocks varies widely from a simple analog front-end that offers balancing and monitoring and requires a microcontroller (MCU) to a standalone, highly integrated solution that runs autonomously.

This reference design utilizes an ISL94212 Li-ion battery manager IC, which supervises up to 12 series of connected cells. The device provides accurate monitoring and three cell balancing modes – manual balancing mode, timed balancing, and auto balance mode with extensive system diagnostics functions. The BMS IC communicates to a host MCU via an SPI and to other BMS IC devices using a robust, proprietary, two-wire daisy chain system.

Features
  • Highly integrated MCU
  • Supports both standalone and daisy-chained configurations
  • GUI provided export option for generation of detailed register and/or SPI communications log files
  • RL78/G14 MCUs
    • Low-power: as low as 66 µA/MHz and 0.60 µA for RTC + LVD
    • 1.6 V to 5.5 V operation
    • 16 KB to 512 KB Flash
    • 44 DMIPS at 32 MHz
  • ISL94212 Li-ion Battery Manager ICs
    • Supervises up to 12 series-connected cells
    • Provides accurate monitoring, cell balancing, and extensive system diagnostics functions
  • ISL8117 Synchronous Buck Controllers
    • Generates POL voltage rails and bias voltage for a wide variety of applications in industrial and general-purpose segments
    • 4.5 V to 60 V wide input voltage
    • 0.6 V to 54 V wide output voltage
  • ICL3221E RS-232 Transmitters/Receivers
    • 3.0 V to 5.5 V powered
    • Provides ±15 kV ESD protection (IEC61000-4-2 air gap and human body model) on RS-232 pins
    • Meets EIA/TIA-232 and V.28/V.24 specifications, even at VCC: 3.0 V

RL78/G14 MCUs

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
IC MCU 16BIT 64KB FLASH 32HWQFNR5F104BEANA#U0IC MCU 16BIT 64KB FLASH 32HWQFN0View Details
IC MCU 16BIT 64KB FLASH 32HWQFNR5F104BEGNA#U0IC MCU 16BIT 64KB FLASH 32HWQFN0View Details
IC MCU 16BIT 96KB FLASH 32HWQFNR5F104BFANA#U0IC MCU 16BIT 96KB FLASH 32HWQFN0View Details

ISL94212 Li-ion Battery Manager ICs

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
IC BATT MFUNC MULTI 1-12C 64QFPISL94212INZIC BATT MFUNC MULTI 1-12C 64QFP0View Details
IC BATT MFUNC MULTI 1-12C 64QFPISL94212INZ-TIC BATT MFUNC MULTI 1-12C 64QFP0View Details

ISL8117 Synchronous Buck Controllers

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
IC REG CTRLR BUCK 16QFNISL8117AFRZ-T7AIC REG CTRLR BUCK 16QFN0View Details
IC REG CTRLR BUCK 16QFNISL8117FRZ-T7AIC REG CTRLR BUCK 16QFN0View Details
IC REG CTRLR BUCK 16HTSSOPISL8117FVEZ-T7AIC REG CTRLR BUCK 16HTSSOP46 - ImmediateView Details

ICL3221E RS-232 Transmitters/Receivers

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
IC TRANSCEIVER FULL 1/1 16SSOPICL3221ECAZIC TRANSCEIVER FULL 1/1 16SSOP0View Details
IC TRANSCEIVER FULL 1/1 16SSOPICL3221ECAZ-T7AIC TRANSCEIVER FULL 1/1 16SSOP69 - ImmediateView Details
IC TRANSCEIVER FULL 1/1 16SSOPICL3221ECAZ-TIC TRANSCEIVER FULL 1/1 16SSOP3 - ImmediateView Details
Published: 2020-04-23