Renesas R5F104LCDFB#X0

Overview

R5F104LCDFB#X0 from Renesas is a 64-pin LFQFP (10 × 10 mm, 0.5 mm pitch), industrial-grade RL78/G14 16-bit microcontroller with 512 KB flash, 48 KB RAM, and 8 KB data flash. It operates from 1.6–5.5 V, delivers 44 DMIPS at 32 MHz, and supports ultra-low-power modes (0.60 μA in RTC+LVD mode). It targets embedded control in HVAC, motor drives, and industrial HMI.

For engineers reviewing the R5F104LCDFB#X0 datasheet, R5F104LCDFB#X0 pinout, R5F104LCDFB#X0 application, or R5F104LCDFB#X0 equivalent, key selection criteria include its 64-pin LFQFP-0.5mm package, -40°C to +85°C industrial temperature grade (D), integrated RTC with calendar, 12-bit interval timer, and dual-channel 8-bit DAC for analog output generation.

Technical Context

The R5F104LCDFB#X0 implements the RL78 CPU core with 3-stage pipeline CISC architecture, supporting instruction execution times from 0.03125 μs (32 MHz) to 30.5 μs (32.768 kHz). It integrates an Event Link Controller (ELC) enabling hardware-triggered peripheral chaining without CPU intervention.

Its power management includes HALT, STOP, and SNOOZE modes, plus on-chip LVD with 14 selectable voltage thresholds and POR circuitry. The high-accuracy ±1.0% on-chip oscillator (1–64 MHz) eliminates external crystal dependency for many timing-critical applications.

Key Specifications

Pinout & Package

Package: 64-pin LFQFP, 10 × 10 mm body, 0.5 mm pitch, exposed pad not present (non-HWQFN).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit microcontroller applications.

Compared with R5F104LCDFB#X0, the R5F104LGDFB#X0 offers 25% less flash and 33% less RAM while retaining identical packaging and peripheral functionality, whereas R5F104LEDFB#X0 further reduces memory to 256 KB/24 KB - both serve as scalable alternatives when full 512 KB/48 KB capacity is unnecessary.

Availability

R5F104LCDFB#X0 is available at Aetrix Electronics and suitable for industrial motor control, smart HVAC systems, and programmable logic relays requiring stable component supply across extended production lifecycles.

Supply support for R5F104LCDFB#X0 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Renesas Electronics is a global semiconductor leader specializing in microcontrollers, analog, and power solutions for industrial, automotive, and IoT markets.

The RL78/G14 product line delivers true low-power 16-bit MCUs optimized for cost-sensitive, battery-aware, and thermally constrained embedded control applications - balancing performance, integration, and energy efficiency.

FAQ

What is the maximum operating frequency and corresponding performance of the R5F104LCDFB#X0?

The R5F104LCDFB#X0 operates up to 32 MHz and delivers 44 DMIPS (Dhrystone MIPS) at that speed. Its RL78 CPU core uses a 3-stage pipeline and supports variable instruction timing - from 0.03125 μs at 32 MHz down to 30.5 μs at 32.768 kHz - enabling dynamic clock scaling for power optimization. This performance level supports real-time control loops, communication stack processing, and basic GUI rendering in resource-constrained systems.

Does the R5F104LCDFB#X0 support hardware debugging, and what interface is used?

Yes, the R5F104LCDFB#X0 supports on-chip debugging via dedicated TOOLRxD and TOOLTxD pins (P50 and P51), which implement a UART-based debug interface compatible with Renesas E2 emulator and CS+ IDE. This interface operates independently of application UART usage, allowing full firmware download, breakpoint setting, and real-time variable inspection without consuming user-configurable serial ports or requiring SWD/JTAG pins.

What analog peripherals are integrated into the R5F104LCDFB#X0, and what are their key specifications?

The R5F104LCDFB#X0 integrates an 8/10-bit resolution ADC with up to 20 input channels, internal 1.45 V reference voltage, and on-die temperature sensor. It also includes two 8-bit DAC channels with 0–VDD output range and real-time update capability. These analog resources operate across the full 1.6–5.5 V supply range, eliminating need for external references or op-amps in many sensor interface and actuator drive applications.

How does the R5F104LCDFB#X0 manage low-power operation, and what is its lowest active-current mode?

The R5F104LCDFB#X0 achieves ultra-low-power operation through HALT, STOP, and SNOOZE modes. In STOP mode with only RTC and LVD active, it draws just 0.60 μA (typical) at VDD = 3.0 V and TA = 25°C. This mode retains RAM content and allows wake-up via RTC alarm or external interrupt, making it ideal for battery-backed applications requiring long-term timekeeping and periodic wake-up events without full system reset.

Is the R5F104LCDFB#X0 pin-compatible with other RL78/G14 variants in the same package, and what does that mean for design reuse?

Yes, the R5F104LCDFB#X0 is pin-compatible with all other RL78/G14 devices in the 64-pin LFQFP-0.5mm package (e.g., R5F104LGDFB#X0, R5F104LEDFB#X0), sharing identical pin functions, electrical characteristics, and layout requirements. This enables hardware design reuse across memory variants - firmware can be scaled to match flash/RAM capacity, while PCBs and schematics remain unchanged, reducing qualification effort and accelerating product family development.