Renesas R5F11778GNA#U0

Overview

R5F11778GNA#U0 from Renesas Electronics is an RL78/I1D 16-bit microcontroller designed for ultra-low-power industrial applications. It features 8 KB code flash, 2 KB data flash, 0.7 KB RAM, 24-pin HWQFN (4 × 4 mm, 0.5 mm pitch), and operates from 1.6 V to 3.6 V across −40°C to +105°C. Key capabilities include dual simplified SPI/CSI, dual simplified I²C, 16-bit timer array (4 channels), 12-bit RTC with calendar, and integrated operational amplifiers - enabling compact sensor interface and battery-powered control systems.

For engineers reviewing the R5F11778GNA#U0 datasheet, R5F11778GNA#U0 pinout, R5F11778GNA#U0 application, or R5F11778GNA#U0 equivalent, this page delivers verified technical context, validated pin functions, real-world use scenarios in industrial sensing and low-power HMI, and two confirmed alternative parts with documented functional and packaging differences.

Technical Context

The R5F11778GNA#U0 implements the RL78 CPU core with CISC architecture, 3-stage pipeline, and selectable instruction execution time (0.04167 μs at 24 MHz high-speed on-chip oscillator or 66.6 μs at 15 kHz low-speed mode). It integrates a regulator-based power system supporting HALT, STOP, and SNOOZE low-power modes - achieving 58.3 μA/MHz active current and 0.64 μA in RTC+LVD-only operation.

Peripheral integration includes Event Link Controller (ELC) with 17 event inputs and 5 trigger outputs, Data Transfer Controller (DTC) with 20 activation sources, and dual CSI/I²C interfaces routed via peripheral I/O redirection register (PIOR0). All analog resources - 6-channel 8/12-bit ADC, 2 comparators, and 4 operational amplifiers - share AVDD/AVSS rails and support internal 1.45 V reference and temperature sensing.

Key Specifications

Pinout & Package

Package: 24-pin HWQFN (4 × 4 mm, 0.5 mm pitch) with exposed die pad recommended to be connected to VSS. Pin count and function mapping are specific to the R5F11778GNA#U0 variant per Renesas datasheet R01DS0244EJ0241.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F11778GNA#U0, R5F1177AGNA#U0 offers double flash and RAM in identical packaging for seamless firmware scaling, while R5F11768GSP#30 trades I/O count and serial interface density for smaller footprint and lower unit cost - making each alternative optimal for distinct design constraints.

Availability

R5F11778GNA#U0 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart meter interfaces, and low-power HMI panels requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for R5F11778GNA#U0 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, power, and SoC solutions for automotive, industrial, and IoT markets.

The RL78/I1D product line delivers true low-power 16-bit MCUs optimized for cost-sensitive industrial applications requiring extended battery life, robust analog integration, and extended temperature operation up to +105°C.

FAQ

What is the maximum operating frequency and accuracy of the high-speed on-chip oscillator in R5F11778GNA#U0?

The R5F11778GNA#U0 supports a high-speed on-chip oscillator up to 24 MHz with ±1.0% accuracy over −20°C to +85°C at VDD = 1.8–3.6 V. At 1.6–1.8 V, accuracy degrades to ±5.0%. This oscillator serves as the default startup clock and enables 0.04167 μs minimum instruction execution time at 24 MHz - critical for deterministic real-time response in industrial control loops.

Does R5F11778GNA#U0 support background data flash rewriting while executing code from program memory?

Yes, the R5F11778GNA#U0 supports Background Operation (BGO) for data flash memory. Instructions can be executed from code flash while rewriting the 2 KB data flash - enabling seamless firmware parameter updates or data logging without halting application execution. The flash library uses RAM starting at address FF300H, and data flash endurance is rated at 1,000,000 rewrite cycles (typical).

How many analog input channels and operational amplifiers does R5F11778GNA#U0 provide?

The R5F11778GNA#U0 provides 6 analog input channels (ANI0–ANI5) for its 8/12-bit ADC and integrates 4 operational amplifiers (AMP0–AMP3), each with dedicated +, −, and output pins mapped to specific GPIOs (e.g., AMP0 uses P12, P13, P14). These op-amps operate from the same AVDD/AVSS rails as the ADC and support single-ended or differential configurations for sensor signal conditioning.

What low-power modes are available on R5F11778GNA#U0, and what is the lowest achievable current draw?

The R5F11778GNA#U0 supports HALT, STOP, and SNOOZE modes. In STOP mode with only RTC2 and LVD active, it achieves 0.64 μA typical current draw at VDD = 3.0 V and TA = 25°C. This ultra-low quiescent current enables multi-year operation on coin-cell batteries in remote monitoring applications - verified per Renesas datasheet R01DS0244EJ0241 Section 1.1.

Is R5F11778GNA#U0 pin-compatible with other RL78/I1D variants in the same package?

Yes, the R5F11778GNA#U0 is pin-compatible with R5F1177AGNA#U0 in the 24-pin HWQFN package - sharing identical pin count, pitch (0.5 mm), mechanical outline (4 × 4 mm), and full pin function mapping. This allows direct substitution for firmware upgrades without PCB revision, provided layout accommodates the same thermal pad connection to VSS.