RL78/G23 16-bit MCU with 32 MHz core and capacitive touch
The R7F100GJF2DFA#AA0 is a 16-bit RL78/G23 MCU from Renesas, clocked at 32 MHz. The 16-bit data path handles sensor-fusion loops and control tasks where an 8-bit core would stall on 16-bit arithmetic. On-chip memory includes 96 KB flash, 12 KB RAM, and 8 KB EEPROM — enough for a modest firmware image with a non-volatile calibration table and a real-time OS footprint. The integrated capacitive touch peripheral eliminates a separate touch controller IC, reducing BOM count on panels or appliances with membrane-replacement buttons.
I/O count, data converters, and connectivity mix
44 general-purpose I/O lines are available in the 52-LQFP package — four more than the 40-pin RL78/G23 siblings (R7F100GGN2DNP#AA0 and R7F100GGH2DFB#BA0). That extra I/O matters when driving a parallel LCD or a row-column key matrix alongside the serial buses. The ADC block has 12 channels at 10-bit resolution plus 8 channels at 12-bit; the DAC provides 2 channels at 8-bit. This resolution split suits battery-voltage monitoring (10-bit is enough) and fine analog sensing (12-bit) on the same die. Serial interfaces include CSI, I²C, LINbus, SPI, and UART/USART — covering the common fieldbus and sensor protocols without external transceivers for short-reach links.
Active production and package availability
The 0.65 mm pitch is layout-friendly for a two-layer board; a four-layer stack improves signal integrity on the higher-speed I²C and SPI lines.
Supply voltage and internal oscillator
Peripherals include LVD (low-voltage detect), POR (power-on reset), PWM, and WDT — the basic supervisory blocks are on-die, no external reset or watchdog IC needed.