Renesas R5F1037AANA#65

Overview

R5F1037AANA#65 from Renesas Electronics 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 integrates 12 KB code flash, 1 KB RAM, 10-bit 8-channel ADC, single UART, and a 24 MHz high-speed on-chip oscillator with ±5.0% accuracy - enabling battery-powered sensor nodes and smart home peripherals.

For engineers reviewing the R5F1037AANA#65 datasheet, R5F1037AANA#65 pinout, R5F1037AANA#65 application, or R5F1037AANA#65 equivalent, key selection criteria include its 24-pin HWQFN (4 × 4 mm, 0.5 mm pitch) footprint, absence of data flash memory, lack of DMA and safety functions (CRC/RAM guard), and reduced serial interface count versus R5F1027x variants.

Technical Context

The R5F1037AANA#65 implements the RL78 CPU core with CISC architecture and 3-stage pipeline, delivering 31 DMIPS at 24 MHz. Its power management includes HALT, STOP, and SNOOZE modes, achieving 63 μA/MHz active current consumption under 1.8–5.5 V supply.

It supports a single UART channel, one simplified SPI (CSI) channel, no simplified I²C, and four 16-bit timer channels with PWM capability. The 10-bit A/D converter operates across eight analog input pins (ANI0–ANI3, ANI16–ANI19) with internal 1.45 V reference and integrated temperature sensor.

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 R5F1027AANA#65, the R5F1037AANA#65 omits data flash and safety features to reduce cost and power, while R5F1037ADNA#65 provides identical functionality with industrial qualification - making the latter ideal for drop-in reliability upgrades.

Availability

R5F1037AANA#65 is available at Aetrix Electronics and suitable for smart home sensors, USB-C power monitors, wireless transmitters, LED lighting controllers, and battery-operated IoT endpoints requiring stable component supply across design-in, prototyping, and volume production phases.

Supply support for R5F1037AANA#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 Corporation is a global semiconductor leader headquartered in Tokyo, Japan, specializing in microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT markets.

The RL78/G12 product line delivers true low-power 16-bit MCUs targeting cost-sensitive, battery-operated consumer and industrial control applications - emphasizing energy efficiency, integration, and ease of development.

FAQ

What is the maximum operating frequency and instruction execution time of the R5F1037AANA#65?

The R5F1037AANA#65 supports a maximum high-speed on-chip oscillator frequency of 24 MHz, yielding a minimum instruction execution time of 0.04167 µs. This timing is achievable only when using the high-speed on-chip oscillator in HS mode with VDD ≥ 2.7 V; at lower voltages or with external crystal, max frequency is reduced to 20 MHz or 16 MHz respectively. The R5F1037AANA#65 does not support 32 MHz operation.

Does the R5F1037AANA#65 include data flash memory?

No, the R5F1037AANA#65 does not include data flash memory. As confirmed in the RL78/G12 datasheet Section 1.3.1, R5F103 products - including R5F1037AANA#65 - omit the 2 KB data flash present in R5F102 variants. This affects firmware update strategies and eliminates background data rewriting capability. The R5F1037AANA#65 relies solely on its 12 KB code flash for program storage.

What are the supported serial communication interfaces on the R5F1037AANA#65?

The R5F1037AANA#65 supports exactly one UART channel (UART0), one simplified SPI (CSI) channel (CSI00), and zero simplified I²C channels - per Section 1.3.3 and Table 1-1 of the RL78/G12 datasheet. It retains full I²C bus capability via SCLA0/SDAA0 pins (P60/P61), but lacks the simplified I²C peripheral logic required for automatic protocol handling. Developers must implement bit-banged I²C if needed.

What is the package type and pin count of the R5F1037AANA#65?

The R5F1037AANA#65 uses a 24-pin HWQFN package (4 × 4 mm body, 0.5 mm pitch) with an exposed die pad that must be connected to VSS for thermal and electrical stability. This matches the "NA" package code in the part number and is documented in Table 1-1 (Page 4) and Figure 1-4 (Page 8) of the RL78/G12 datasheet R01DS0193EJ0250.

Is the R5F1037AANA#65 suitable for industrial temperature applications?

The R5F1037AANA#65 is qualified for consumer applications with an operating ambient temperature range of –40°C to +85°C (denoted by the "A" field code). It is not rated for industrial-grade screening or extended temperature validation. For industrial use, select the functionally identical R5F1037ADNA#65 ("D" grade) or R5F1037AGNA#65 ("G" grade for –40°C to +105°C), both sharing the same R5F1037AANA#65 silicon but with enhanced reliability testing.