Renesas R5F10377ANA#U5

Overview

R5F10377ANA#U5 from Renesas is a 24-pin RL78/G12 16-bit microcontroller with 4 KB code flash, 256 B RAM, and no data flash memory, operating at 1.8–5.5 V. It delivers 31 DMIPS at 24 MHz, supports ultra-low-power HALT/STOP/SNOOZE modes (63 μA/MHz), and integrates an 8/10-bit 8-channel ADC, UART, CSI, and 4-channel 16-bit TAU timer - used in battery-powered sensor nodes and industrial control interfaces.

For engineers reviewing the R5F10377ANA#U5 datasheet, R5F10377ANA#U5 pinout, R5F10377ANA#U5 application, or R5F10377ANA#U5 equivalent, key selection criteria include its HWQFN-24 package, absence of DMA and data flash, ±5.0% high-speed on-chip oscillator accuracy over –40°C to +85°C, and compatibility with RL78 toolchains and IAR/CS+ IDEs.

Technical Context

The R5F10377ANA#U5 implements the RL78 CPU core with CISC architecture and 3-stage pipeline, enabling minimum instruction execution time of 0.04167 µs at 24 MHz. Its clock system combines a high-speed on-chip oscillator (1–24 MHz, ±5.0% accuracy) and low-speed 15 kHz on-chip oscillator, with external crystal support up to 20 MHz via X1/X2 pins.

Peripheral integration includes one UART channel, one simplified SPI (CSI) channel, no simplified I²C, four 16-bit timer channels (TAU0), one 12-bit interval timer, one window watchdog timer, and eight analog input channels with internal 1.45 V reference - all configured via dedicated SFRs and peripheral I/O redirection register (PIOR).

Key Specifications

Pinout & Package

Package: HWQFN-24 (4 mm × 4 mm, 0.5 mm pitch), exposed die pad (to be connected to VSS). Pin count: 24. Pin functions validated per Renesas R01DS0193EJ0250 Rev.2.50, Section 1.4.2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F10277ANA#U5, the R5F10377ANA#U5 trades data flash and tighter oscillator tolerance for lower cost and reduced firmware complexity; versus R5F10378ANA#U5, it offers smaller flash footprint ideal for minimal bootloaders or fixed-function firmware.

Availability

R5F10377ANA#U5 is available at Aetrix Electronics and suitable for smart home sensor nodes, industrial panel controllers, portable medical monitors, and energy meter communication modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for R5F10377ANA#U5 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 Japanese semiconductor manufacturer specializing in microcontrollers, analog, and power devices for automotive, industrial, and IoT markets.

The RL78/G12 product line delivers ultra-low-power 16-bit MCUs optimized for cost-sensitive, battery-operated general-purpose applications - balancing performance, integration, and energy efficiency.

FAQ

What is the maximum operating frequency and corresponding DMIPS rating for the R5F10377ANA#U5?

The R5F10377ANA#U5 achieves a maximum operating frequency of 24 MHz using its high-speed on-chip oscillator, delivering 31 DMIPS of processing performance. This rating is measured under standard conditions (VDD = 2.7–5.5 V, TA = –40°C to +85°C) and reflects the RL78 CPU core's 3-stage pipeline efficiency. The R5F10377ANA#U5 maintains this performance across its full 1.8–5.5 V supply range.

Does the R5F10377ANA#U5 include data flash memory, and how does that affect firmware updates?

No, the R5F10377ANA#U5 does not include data flash memory - unlike the R5F102x series. Firmware updates must be performed exclusively via the 4 KB code flash using Renesas Flash Self Programming Library Type01. This eliminates background data logging but simplifies memory management and reduces BOM cost. The R5F10377ANA#U5 supports secure flash shield window protection to prevent unauthorized access.

What are the key differences between the R5F10377ANA#U5 and R5F10277ANA#U5 in terms of peripherals and accuracy?

The R5F10377ANA#U5 omits data flash, DMA controller, hardware CRC, and RAM/SFR guard features present in the R5F10277ANA#U5. Its high-speed on-chip oscillator accuracy is ±5.0% (–40°C to +85°C), versus ±1.0% for the R5F10277ANA#U5. Both share identical pinout, package, and core peripherals including UART, CSI, and TAU timers - making them drop-in replacements where those omitted features are unnecessary.

Which serial interfaces are available on the R5F10377ANA#U5, and how are they mapped to pins?

The R5F10377ANA#U5 provides one UART channel (RxD0/TxD0 on P11/P12), one simplified SPI (CSI00 on P10/P11/P12), and one I²C bus (SCLA0/SDAA0 on P60/P61). It does not support simplified I²C. CSI01 is available on P41/P42 for secondary SPI use. All interfaces are configurable via the peripheral I/O redirection register (PIOR), and UART/CSI share pins - requiring careful multiplexing in PCB layout.

What is the ADC configuration of the R5F10377ANA#U5, and what reference voltage options does it support?

The R5F10377ANA#U5 integrates an 8/10-bit successive-approximation ADC with 8 input channels (ANI0–ANI3, ANI16–ANI19). It uses an internal 1.45 V reference voltage and supports single-ended analog inputs referenced to AVREFP/AVREFM. No external reference input is provided. Conversion is software-triggered or timer-triggered, with typical accuracy specified across the full 1.8–5.5 V supply range - making the R5F10377ANA#U5 suitable for supply-independent sensor measurement.