RAJ240071 and RAJ240075 (hereafter these are written as RAJ24007X) are Renesas Li-ion battery fuel gauge ICs (FGIC) which consists of an MCU device and an AFE device in a single package. Packed with a variety of battery management features and Renesas RL78 CPU core which has multiple low power modes and capable of achieving high performance in ultra-low power operation. RAJ24007X fuel gauge IC has control firmware stored in embedded flash memory to control attached embedded analog and digital circuits to execute 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 5 Li-ion or Li-Polymer battery cells in series.
  • Integrated with Renesas Ultra Low Power RL78 CPU core for multi-function process
  • Memory
    • Code flash memory: 32KB (RAJ240071), 64KB (RAJ240075)
    • Data flash memory (up to 100,000 erase/write cycles): 4KB
    • SRAM: 1.5KB (RAJ240071), 4KB (RAJ240075)
  • Clock generator
    • High-Speed on-chip oscillator: up to 32MHz
    • Low speed on-chip oscillator: 32KHz
    • AFE on-chip oscillator: 4.194MHz
  • General Purpose I/O Ports
    • Total: 11 pins
    • CMOS input/output: 6
    • CMOS input: 2
    • N-ch open drain: 2
    • High voltage output [VCC tolerance]: 1
  • Serial interface
    • CSI (SPI): 1 channel
    • I2C: 1 channel
    • UART: 1 channel
    • Simplified I2C: 1 channel
  • Timer
    • MCU 16-bit timer: 3 channels
    • MCU 12-bit interval timer: 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
  • 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 CREG2
    • 1.8V CREG1
  • Charge and Discharge MOSFET control, high side Nch MOSFET drive circuit embedded, programmable MOSFET control by 8-bit PWM
  • Fuse control: FUSEOUT pin can support fuse blow function.
  • Intel® Dynamic Battery Power Technology support
  • Voltage and temperature condition
    • Power supply voltage: VCC = 4.0 to 25 V
    • Operating ambient temperature: Ta = -20 to +85°C
  • Package Information: 32 pin plastic mold QFN ([Body] 4.0 mm x 4.0 mm, 0.4 mm pitch)


PDF 4.40 MB Datasheet
PDF 5.51 MB 日本語 Brochure
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