Renesas R5F523E6BDNF#20

Overview

R5F523E6BDNF#20 from Renesas is a 32-bit RXv2 microcontroller optimized for high-precision analog measurement in industrial sensor nodes and metering systems. It integrates a 24-bit delta-sigma ADC with 125 kSPS max sampling rate, ±5-V input range, rail-to-rail programmable gain instrumentation amplifier (gain = 1–128), on-chip excitation current sources (50–1000 µA), and 2.5-V low-drift voltage reference (8 ppm/°C). Operating at up to 32 MHz, it delivers 64 DMIPS and includes CAN, SCI, I²C, and RSPI interfaces.

For engineers reviewing the R5F523E6BDNF#20 datasheet, R5F523E6BDNF#20 pinout, R5F523E6BDNF#20 application, or R5F523E6BDNF#20 equivalent, key selection criteria include its 40-pin HWQFN package (6 × 6 mm), absence of LCD driver, D-version temperature grade (–40°C to +85°C), 256-KB flash / 32-KB SRAM / 8-KB data flash memory configuration, and support for IEC60730-compliant self-diagnostic functions in safety-critical analog acquisition.

Technical Context

The R5F523E6BDNF#20 implements a CISC Harvard architecture with 5-stage pipeline and variable-length instructions, enabling ultra-compact code and single-cycle instruction execution at 32 MHz. Its analog subsystem centers on the DSADB unit synchronized to PCLKC (up to 16 MHz), featuring fourth- and fifth-order sinc digital filters, simultaneous 50/60 Hz rejection at 10/54 SPS, and hardware-assisted disconnect detection for delta-sigma inputs and excitation sources.

Digital subsystem coordination relies on the Event Link Controller (ELC), allowing timer-triggered ADC conversions and peripheral module chaining without CPU intervention-critical for deterministic low-power operation in software standby mode. The MCU supports three low-power modes, with the Low Power Timer (LPT) running off the 32.768-kHz sub-clock during software standby to maintain timekeeping while minimizing current draw.

Key Specifications

Pinout & Package

Packaged in a 40-pin HWQFN (PWQN0040KD-A), 6 × 6 mm, 0.5 mm pitch, with exposed thermal pad. Pin count and I/O allocation match Table 1.2 for 40-pin variants: 13 I/O pins (or 14 depending on HVAIN configuration), 1 dedicated input pin, 14 pull-up resistors, 13 open-drain outputs, and 2 pins 5-V tolerant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-precision analog acquisition applications.

Compared with R5F523E5BDNF#20, R5F523E6BDNF#20 provides double flash/SRAM for complex metrology algorithms and OTA updates; compared with R5F523E6KDNF#20, it trades ±10-V input capability for lower BOM cost and simplified layout where ±5-V sensors dominate.

Availability

R5F523E6BDNF#20 is available at Aetrix Electronics and suitable for industrial weigh scales, energy meters, process transmitters, and condition monitoring sensors requiring stable component supply across extended product lifecycles.

Supply support for R5F523E6BDNF#20 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 industrial, automotive, and IoT applications.

The RX23E-B Group targets high-accuracy sensor signal conditioning and metrology, integrating precision analog front-ends with robust real-time processing and functional safety features for industrial automation and smart grid systems.

FAQ

What is the maximum sampling rate of the 24-bit delta-sigma ADC in R5F523E6BDNF#20?

The R5F523E6BDNF#20 supports a maximum sampling rate of 125 kSPS for its 24-bit delta-sigma ADC (DSADB unit). This rate is achievable with modulator clock fMOD = 4 MHz and appropriate sinc filter configuration. At lower data rates (e.g., 10 or 54 SPS), the device enables simultaneous 50 Hz and 60 Hz noise rejection-critical for energy metering and industrial weighing applications where mains interference must be suppressed in real time.

Does R5F523E6BDNF#20 include an LCD controller/driver?

No, R5F523E6BDNF#20 does not include an LCD controller/driver. The "B" suffix in the part number explicitly denotes exclusion of the LCD function, as confirmed in Figure 1.1 of the datasheet. This distinguishes it from "J", "L", "N", and "G" variants that integrate the LCDC module. The absence of LCD hardware reduces die size and cost, making R5F523E6BDNF#20 ideal for headless sensor nodes and metering applications relying on external displays or serial communication interfaces.

What analog input voltage range does R5F523E6BDNF#20 support?

R5F523E6BDNF#20 supports a ±5-V analog input range on its HVAIN pins, as specified by the "B" variant designation in Table 1.3 and Figure 1.1. This is distinct from "K" and "L" variants offering ±10-V range. The ±5-V capability enables direct interfacing with common industrial sensors-including strain gauges, RTDs, and pressure transducers-without external level-shifting circuitry, while maintaining 24-bit effective resolution and low-noise performance across the full range.

How many excitation current sources does R5F523E6BDNF#20 provide, and what are their specifications?

R5F523E6BDNF#20 provides two independent excitation current sources (IEXC0 and IEXC1), each programmable from 50 µA to 1000 µA in six discrete steps. These sources feature ±0.2% current matching and 5 ppm/°C drift matching-key for accurate 3- and 4-wire RTD measurements. Each channel includes hardware-assisted disconnect detection, enabling automatic fault identification in sensor wiring without software polling, thereby improving system reliability in harsh industrial environments.

What is the operating temperature range for R5F523E6BDNF#20?

R5F523E6BDNF#20 is rated for an operating ambient temperature range of –40°C to +85°C, indicated by the "D" suffix in its part number per Figure 1.1. This D-version qualification meets industrial-grade requirements for deployment in factory automation, building management, and outdoor metering applications. The MCU maintains full specification compliance-including ADC accuracy, reference stability, and timing performance-across this entire range, with the 2.5-V voltage reference exhibiting only 8 ppm/°C drift from –40°C to +85°C.