Renesas Launches 3 to 8/10 Cells Battery Fuel Gauge ICs

Renesas has introduced the RAJ240090/RAJ240100, which are 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.

Key Features of RAJ240090/RAJ240100

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, and 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
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
Over-current detection circuit
- Short circuit current detection
- Charge over-current detection
- Discharge over-current detection
- Charge wakeup current detection
- Discharge wakeup current detection
Series regulator
- 3.3 V or 5.0 V CREG2
- Over 100mA output current by external N-channel MOSFET
Charge and Discharge MOSFET control
- High-side N-channel MOSFET drive circuit embedded
- Programmable MOSFET control by 8-bit PWM
Voltage and temperature condition
- Power supply voltage: VCC = 4.0 to 50 V
- 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)