RL78/G23 — 16-bit MCU with 192 KB Flash and capacitive touch
The Renesas R7F100GFH2DFP#HA0 is a 16-bit MCU from the RL78/G23 series, built around the RL78 core running at 32 MHz. It packs 192 KB of Flash program memory in a 44-pin LQFP, with 37 general-purpose I/O lines. The part integrates a 10-channel A/D converter (selectable 8-, 10-, or 12-bit resolution), a 2-channel 8-bit D/A converter, and a capacitive touch sensing unit — all on a single die. Typical applications include industrial control panels, home appliance user interfaces, sensor nodes, and battery-powered instrumentation where the 1.6 V minimum supply and low-power operation matter.
At 32 MHz the RL78 core delivers enough throughput for real-time tasks like motor commutation, sensor polling at a few kHz, or capacitive touch scanning without a dedicated controller. The 16-bit data path keeps code density efficient for control algorithms. If your application needs floating-point or DSP-style filtering, the RL78 is a fixed-point architecture — plan your math accordingly.
1.6 V supply — battery-friendly floor
The 1.6 V minimum operating voltage lets this MCU run directly from two alkaline cells or a single Li-ion cell near end-of-discharge. That 1.6 V floor is unusual for a 16-bit part with 192 KB Flash — most competitors need 1.8 V or higher. For a design targeting a coin cell or energy-harvesting source, this part keeps the BOM simple without a boost converter.
Capacitive touch — no extra controller needed
The built-in capacitive touch sensing unit handles button, slider, and wheel electrodes directly. That eliminates a dedicated touch controller IC and its associated firmware overhead. The RL78/G23 touch library is available from Renesas, so the firmware team can start from a reference rather than writing a driver from scratch.
It does not carry the 105°C or 125°C rating needed for under-hood automotive or downhole tools — if your environment exceeds 85°C, look at the RL78/G23 variants with the extended temperature suffix.
Connectivity and peripherals
On-chip LVD (low-voltage detect), POR (power-on reset), PWM, and WDT reduce external supervision ICs. The internal oscillator means no external crystal for many applications, though an external clock can be used when tighter timing is needed.
Renesas lists the R7F100GFH2DFP#HA0 as Active. The RL78/G23 series is a mainstream portfolio, so long-term supply looks stable.