Renesas R5F10378ANA#65

Overview

R5F10378ANA#65 from Renesas is a 24-pin HWQFN-packaged RL78/G12 16-bit microcontroller designed for ultra-low-power embedded control in consumer-grade applications (–40°C to +85°C). It features 8 KB code flash, 512 B RAM, 10-bit 8-channel ADC, 4-channel 16-bit TAU timer, and single UART/CSI interface - enabling compact sensor nodes and battery-powered UI controllers.

For engineers reviewing the R5F10378ANA#65 datasheet, R5F10378ANA#65 pinout, R5F10378ANA#65 application, or R5F10378ANA#65 equivalent, key selection criteria include its 24-pin HWQFN (4 × 4 mm, 0.5-mm pitch) footprint, absence of data flash and DMA, ±5% high-speed on-chip oscillator accuracy over –40°C to +85°C, and support for single UART + single simplified SPI (CSI) peripheral configuration.

Technical Context

The R5F10378ANA#65 implements the RL78 CPU core with 3-stage pipeline CISC architecture, delivering 31 DMIPS at 24 MHz while consuming only 63 μA/MHz. Its clock system combines a high-speed on-chip oscillator (selectable 1–24 MHz, ±5% accuracy) with low-speed 15 kHz on-chip oscillator for STOP/HALT modes.

Peripheral integration includes one UART channel (RxD0/TxD0), one simplified SPI (CSI00) channel, no I²C master/slave capability, and four 16-bit timer channels (TAU0 ch00–ch03) supporting PWM output, input capture, and interval timing - all mapped to dedicated pins without peripheral I/O redirection dependency in default PIOR=00H configuration.

Key Specifications

Pinout & Package

Package: HWQFN-24 (4 × 4 mm, 0.5-mm pitch), exposed die pad (to be connected to VSS), RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F10278ANA#65, the R5F10378ANA#65 trades data flash and tighter oscillator tolerance for lower cost and reduced firmware complexity; versus R5F1037AANA#65, it offers identical peripheral set at lower flash density - making it optimal for cost-constrained, fixed-function control tasks.

Availability

R5F10378ANA#65 is available at Aetrix Electronics and suitable for smart home sensors, industrial HMI panels, portable medical monitors, and white goods motor control requiring stable component supply across production lifecycles.

Supply support for R5F10378ANA#65 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 automotive, industrial, and IoT markets.

The RL78/G12 product line delivers true low-power 16-bit MCUs targeting cost-sensitive, battery-operated, and general-purpose embedded control applications with integrated analog and timing peripherals.

FAQ

What is the maximum operating frequency and instruction throughput of the R5F10378ANA#65?

The R5F10378ANA#65 operates at up to 24 MHz using its high-speed on-chip oscillator, achieving 31 DMIPS performance. Its RL78 CPU core executes instructions in as little as 0.04167 μs at 24 MHz, with minimum instruction time scaling to 1 μs at 1 MHz for ultra-low-power operation. This makes the R5F10378ANA#65 suitable for real-time control loops requiring deterministic timing without external clock sources.

Does the R5F10378ANA#65 support data flash memory or self-programming capabilities?

No, the R5F10378ANA#65 does not include data flash memory or self-programming functionality. Unlike the R5F1027x series, the R5F10378ANA#65 omits the 2 KB data flash block and associated flash shield window and background operation features. Firmware updates must be performed via the 8 KB code flash using standard in-system programming methods, and parameter storage requires external EEPROM or FRAM if non-volatile retention is needed.

Which serial communication interfaces are implemented on the R5F10378ANA#65?

The R5F10378ANA#65 integrates one UART channel (RxD0/TxD0) and one simplified SPI (CSI00) channel. It does not implement simplified I²C, full I²C, or additional UART/CSI channels. The CSI00 interface supports master-only operation with SCK00, SI00, and SO00 pins - enabling communication with SPI sensors, displays, or ADCs. No hardware I²C bus controller is present, so I²C protocol must be bit-banged if required.

What are the power supply requirements and low-power modes supported by the R5F10378ANA#65?

The R5F10378ANA#65 operates from a single 1.8 V to 5.5 V supply and supports HALT, STOP, and SNOOZE low-power modes. In STOP mode, current drops to sub-μA levels with wake-up possible via INTP0–INTP3, timer events, or reset. The on-chip voltage detector provides 12 selectable threshold levels for brown-out detection and reset generation. These features make the R5F10378ANA#65 ideal for energy-harvesting or battery-powered systems where runtime optimization is critical.

Is the R5F10378ANA#65 pin-compatible with other RL78/G12 devices in the same package?

The R5F10378ANA#65 shares the same 24-pin HWQFN package and pinout with other R5F1037x variants (e.g., R5F1037AANA#65, R5F10379ANA#65), but is not pin-compatible with R5F1027x devices due to functional differences in peripheral mapping - notably the absence of data flash control signals and DMA-related pins. While mechanical footprint matches, firmware and schematic design must account for missing peripherals and altered oscillator accuracy specifications in the R5F10378ANA#65.