Renesas R5F10366ASP#55

Overview

R5F10366ASP#55 from Renesas Electronics is a 20-pin LSSOP ultra-low-power 16-bit RL78/G12 microcontroller for consumer-grade embedded control, featuring 2 KB code flash, 256 B RAM, 1.8–5.5 V operation, 24 MHz max CPU speed (31 DMIPS), and 63 μA/MHz active current. It integrates an 8/10-bit 11-channel ADC, UART, simplified SPI (CSI), on-chip debug, and operates across –40°C to +85°C.

For engineers reviewing the R5F10366ASP#55 datasheet, R5F10366ASP#55 pinout, R5F10366ASP#55 application, or R5F10366ASP#55 equivalent, key selection criteria include its 20-pin LSSOP package, absence of data flash, single UART channel, no DMA or safety functions (CRC/RAM guard), and suitability for cost-sensitive, battery-powered sensor nodes and appliance controls requiring minimal peripheral count and low-voltage operation.

Technical Context

The R5F10366ASP#55 implements the RL78 CISC core with 3-stage pipeline, 1 MB address space, and configurable instruction timing (0.04167 µs min @ 24 MHz). Its clock system combines a high-speed on-chip oscillator (±5% accuracy over –40°C to +85°C) and external crystal support (1–20 MHz), enabling flexible power/performance trade-offs via HALT, STOP, and SNOOZE modes.

Peripheral integration includes one 16-bit timer (TAU0) with four channels, one watchdog timer, one 12-bit interval timer, and a programmable buzzer/clock output controller. I/O features 18 pins total - including two 6-V-tolerant N-ch open-drain outputs and configurable pull-ups - supporting mixed-voltage interfacing (1.8/2.5/3.3 V).

Key Specifications

Pinout & Package

Package: 20-pin plastic LSSOP (4.4 × 6.5 mm, 0.65-mm pitch), RoHS-compliant, JEDEC standard PLSP0020JB-A footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F10266ASP#55, R5F10366ASP#55 trades data flash and safety features for lower cost and reduced die size; versus R5F10367ASP#55, it provides identical functionality at lower memory capacity - making it optimal for fixed-feature, high-volume consumer controls.

Availability

R5F10366ASP#55 is available at Aetrix Electronics and suitable for home appliance control, industrial sensor nodes, portable medical devices, and consumer IoT endpoints requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.

Supply support for R5F10366ASP#55 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 Corporation is a Japanese semiconductor manufacturer specializing in microcontrollers, analog, and power management ICs for automotive, industrial, and IoT markets.

The RL78/G12 product line delivers ultra-low-power 16-bit MCUs targeting cost-sensitive, battery-operated consumer and industrial control applications - emphasizing energy efficiency, integrated analog, and simplified development.

FAQ

What is the maximum operating frequency and corresponding DMIPS performance of the R5F10366ASP#55?

The R5F10366ASP#55 operates at up to 24 MHz using its high-speed on-chip oscillator, delivering 31 DMIPS of processing performance. This speed is achievable across the full 1.8–5.5 V supply range and –40°C to +85°C ambient temperature. The RL78 core's 3-stage pipeline and efficient CISC instruction set enable deterministic real-time execution critical for motor control and sensor sampling tasks in the R5F10366ASP#55.

Does the R5F10366ASP#55 include data flash memory, and what are the implications for firmware updates?

No, the R5F10366ASP#55 does not include data flash memory - this is a defining distinction from the R5F102xx series. As a result, it cannot perform in-application data logging or store configuration parameters persistently without external EEPROM or FRAM. Firmware updates require full code flash reprogramming via the on-chip debug interface, and the R5F10366ASP#55 lacks the self-programming library support present in data-flash-equipped variants.

What serial communication interfaces are supported by the R5F10366ASP#55, and how many channels are available?

The R5F10366ASP#55 supports one UART channel, one simplified SPI (CSI) channel, and zero I²C channels - differing from the R5F10266ASP#55 which includes two CSI and two simplified I²C channels. All serial functions are implemented in the SAU0 peripheral block and share common clock sources. No DMA controller is present, so UART/CSI transfers rely on interrupt-driven or polling software routines in the R5F10366ASP#55.

What is the ADC configuration of the R5F10366ASP#55, and does it include an internal reference voltage?

The R5F10366ASP#55 integrates an 8/10-bit successive-approximation ADC with 11 input channels (ANI0–ANI3, ANI16–ANI22), internal 1.45 V reference voltage, and an on-chip temperature sensor. Conversion is performed against either the internal reference or externally supplied AVREFP/AVREFM pins, enabling ratiometric measurements. The ADC supports single-shot and continuous scan modes, with conversion times as low as 1.6 μs per sample at 24 MHz system clock - essential for responsive sensor feedback in the R5F10366ASP#55.

Is the R5F10366ASP#55 pin-compatible with other RL78/G12 20-pin variants, and what package does it use?

Yes, the R5F10366ASP#55 uses the standardized 20-pin LSSOP package (PLSP0020JB-A, 4.4 × 6.5 mm, 0.65 mm pitch) and shares identical pinout with all other R5F103xxASP and R5F102xxASP 20-pin variants. This enables drop-in replacement within the same memory and peripheral subset - for example, upgrading from R5F10366ASP#55 to R5F10367ASP#55 requires no PCB changes, as both use identical footprint, pin functions, and voltage ratings.