RAJ240071 and RAJ240075 (hereafter these are written as RAJ24007X) are Renesas Li-ion battery fuel gauge ICs (FGIC) which consist 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)




Design & Development