RAJ240090/RAJ240100 are Renesas Li-ion battery fuel gauge ICs (FGICs) that consist of an MCU device and an AFE device in a single package. They are packed with a variety of battery management features and the Renesas RL78 CPU core, which has multiple low-power modes and is capable of achieving high performance in ultra-low power operation. RAJ240090/ RAJ240100 fuel gauge ICs have control firmware stored in embedded flash memory to control attached embedded analog and digital circuits to perform battery voltage / current / temperature measurement, remaining capacity estimation, over current / voltage / temperature protection, and other battery management operations.


  • Fully integrated battery management solution with battery capacity measurement and programmable protection capability.
  • Supports up to 10 Li-ion or Li-Polymer battery cells in series. RAJ240090 supports 3 to 8 series cells, RAJ240100 supports 3 to 10 series cells.
  • Integrated with Renesas Ultra Low Power RL78 CPU core for multi-function process
  • Memory
    • Code flash memory: 128KB
    • Data flash memory (up to 100,000 erase/write cycles): 4 KB
    • SRAM: 7KB
  • Clock generator
    • High-speed on-chip oscillator: up to 32 MHz
    • Low-speed on-chip oscillator:32 KHz
    • AFE High-speed on-chip oscillator: 4.194MHz
    • AFE low-speed on-chip oscillator: 131.072 KHz
  • General Purpose I/O Ports
    • Total: 31 pins
    • CMOS input/output: 20
    • CMOS input: 4
    • N-ch open drain input/output [6V tolerance]: 4
    • High voltage input/output [VCC tolerance]: 3
  • Serial interface
    • CSI (SPI): 2 channels
    • I2C: 1 channel
    • UART: 2 channels
    • Simplified I2C: 2 channels
    • CAN interface (RS-CAN lite): 1 channel
  • Timer
    • MCU 16-bit timer: 6 channels
    • MCU 12-bit interval timer: 1 channel
    • MCU Real-time clock: 1 channel
    • AFE timer: 2 channels
      • AFE timer A: setting range: 125 ms to 64 s
      • AFE timer B: setting range: 30.52 us to 125 ms
  • Embedded A/D converter
    • AFE 15-bit resolution sigma-delta A/D converter
    • MCU 8/10-bit resolution A/D converter
  • Battery cell voltage and temperature (AN port voltage) detection circuit
    • Monitoring over/under voltage and temperature by Sigma-delta AD converter (AFE) without controlling from MCU
  • Current integration circuit
    • 18-bit resolution sigma-delta A/D converter
  • Impedance measurement circuit
    • Simultaneous measurement of battery voltage and current
  • Over current detection circuit
    • Short circuit current detection
    • Charge overcurrent detection
    • Discharge overcurrent detection
    • Charge wakeup current detection
    • Discharge wakeup current detection
  • Series regulator
    • 3.3V or 5.0V CREG2
    • Over 100mA output current by external Nch MOSFET
  • Charge and Discharge MOSFET control
    • High-side Nch MOSFET drive circuit embedded
    • Programmable MOSFET control by 8-bit PWM
  • Support RTC function
    • To connect external crystal resonator (32.768kHz) and generate internal clock.
  • Voltage and temperature condition
    • Power supply voltage: VCC = 4.0 to 50V
    • Operating ambient temperature : TA= -40 to +85°C
  • Package Information
    • 64-pin plastic mold LQFP ([Body] 10.0mm x 10.0mm,0.5 mm pitch)



PDF 3.27 MB Datasheet
PDF 5.51 MB 日本語 Brochure
PDF 270 KB Flyer
PDF 198 KB Flyer
PDF 1.11 MB Brochure
PDF 29 KB 日本語 Tool News - Note
PDF 417 KB 日本語 , 简体中文 Flyer
PDF 4.86 MB 日本語 Product Change Notice
PDF 3.74 MB 日本語 Product Change Notice
PDF 1.46 MB 日本語 Product Change Notice
PDF 509 KB Application Note
PDF 397 KB Application Note
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Design & Development