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Renesas Electronics RAA489255 Battery Front End

Renesas Electronics RAA489255 Battery Front End is a low-cost 3- to 5-cell battery monitor that measures voltage/temperature and communicates this to an MCU for battery management. The device includes a current monitor and a 5-pin LED driver direct from the battery voltage to enable a low-cost state-of-charge display. The hot-plug tolerant Renesas RAA489255 also features 100mV current wake-up detection and open cell/wire detection.

Features

  • Designed for use with MCU as a battery front end for higher safety BMS
  • Optimizes integration for very low cost
    • Voltage, temperature measurements, current sense, open wire detection, and built-in LED drive direct from Vbat
    • Design and package engineering choices emphasize cost optimization
  • Sample solution code accelerates design time
    • Renesas is developing an Arm®-based solution code that can serve as a complete ready-to-go solution or a starting point for code development to save pack design time
    • Code will be RA and FSP compatible
  • Simple operation
    • Minimal use of complex internal state machines makes part understanding easier
    • Provides vital information to the pack MCU but allows the pack design team the choice of how to use the information
  • Wide 4V to 30V battery voltage range for 3- to 5-cell Li-ion batteries
  • OCV status encoding for LED SOC reporting
  • No internal OV, UV, OT, UT
  • 100mV current wake-up detection
  • Open cell/wire detection (OW)
  • Two thermistor inputs support ±2.5°C temperature protection
  • 6x high-voltage general-purpose outputs (HVGPO) for LEDs, Fuses, FETs, etc
  • Hot plug tolerant
  • I2C interface with CRC
  • Low-cost BFE line-up
  • Battery monitoring function
  • 32-pin QFN package, 4mm x 4mm size, 0.4mm pitch 

Applications

  • Power tools (hand drills, gardening tools)
  • Cleaning tools (portable vacuum cleaners, robotic cleaners)
  • Telecom (ESS)

Related Development Tool

Renesas Electronics RTK489255DE0000BU Evaluation Board

Demonstrates the capabilities and functionality of the RAA489255 Battery Front End.

Learn Moreabout Renesas Electronics RTK489255DE0000BU Evaluation Board View Productsrelated to Renesas Electronics RTK489255DE0000BU Evaluation Board
Paskelbta: 2025-04-29 | Atnaujinta: 2025-05-11