Renesas offers a dedicated single-package solution with an MCU and analog front end (AFE) for battery management systems that constantly monitors the battery state.


Safety Features

  • - Built-in self-diagnostic functions for microcontroller and analog front-end (AFE)
  • - Low power mode for safe storage

High Accuracy

  • - High-precision delta-sigma A/D converter specialized for current, voltage, and temperature detection
  • - Battery level calculation takes battery deterioration into account

Design Support and Tools

  • - Starter Kits include evaluation board with reference design and sample firmware for fast prototyping.
  • - Application Notes and training videos (Under preparing)
  • - Regional support : Please consult your Renesas sales representative or office.

Product Overview

Product Series Cells Voltage [V] ROM/RAM Serial Interfaces I/O Key Features Package
Min Max
2 4 4 - 25 64 KB/4 KB
128 KB/5.5 KB
I²C, UART 12 Small package 32-pin QFN
2 5 4 - 25 32 KB/1.5 KB
48 KB/2 KB
64 KB/4 KB
I²C, UART 11 Small package, 5 series cell support 32-pin QFN
RAJ240080 2 5 4 - 28 64 KB/5.5 KB I²C, UART 22 Multiple GPIO 48-pin LQFP
RAJ240090 3 8 4 - 50 128 KB/7 KB I²C, UART, CAN 31 Multiple GPIO
High voltage
MCU and AFE in a single package
64-pin LQFP
RAJ240100 3 10 4 - 50 128 KB/7 KB I²C, UART, CAN 31 Multiple GPIO
High voltage
MCU and AFE in a single package
64-pin LQFP



Typical Applications

Click here for details.

- Power tool


Block Diagram



Development Environment

Starter Kit:

  • - Hardware and software for Initial evaluation.
  • - Enables evaluation of the device function and performance.
  • - E1 emulator connector for on-chip debugging.
  • - Provide the sample code including all basic functions of battery management.
  • - Users can monitor the battery status such as Voltage, Current and Temperature using the USB-SMBus protocol converter and PC application.

Please refer to the One Page Guides.

When you would like to get the reference boards, sample codes and standard firmware, please contact to your regional sales channels.


For safety and remaining capacity Li-ion battery