Renesas R5F523E5KDNF#20

Overview

R5F523E5KDNF#20 from Renesas is a 32-bit RXv2 microcontroller optimized for high-precision analog measurement in industrial sensor interfaces and smart transmitters. It integrates a 24-bit delta-sigma ADC with ±10-V input capability, rail-to-rail programmable gain instrumentation amplifier (gain = 1–128), on-chip excitation current sources (50–1000 µA), and 128 KB flash/16 KB SRAM - all operating at up to 32 MHz. It targets load cell, pressure sensor, and RTD signal conditioning in DIN-rail or loop-powered field devices.

For engineers reviewing the R5F523E5KDNF#20 datasheet, R5F523E5KDNF#20 pinout, R5F523E5KDNF#20 application, or R5F523E5KDNF#20 equivalent, key selection criteria include its 10-V analog input range, 125 kSPS delta-sigma sampling rate, integrated ±10-V HVAIN pins, dual excitation current sources with ±0.2% matching, and CAN 2.0B compliance - critical for precision industrial I/O modules requiring self-contained analog front-end and deterministic communication.

Technical Context

The R5F523E5KDNF#20 implements the RXv2 CPU core with IEEE 754-compliant 32-bit FPU and DSP extensions, enabling real-time floating-point sensor linearization and compensation algorithms. Its analog subsystem centers on the DSADB unit: a 24-bit delta-sigma ADC with fourth- to fifth-order sinc filtering, simultaneous 50/60 Hz rejection at 10/54 SPS, and offset/gain error calibration support.

Digital integration includes an event link controller (ELC) that triggers ADC conversions or PWM updates without CPU intervention, and a CAN module compliant with ISO 11898-1 (up to 1 Mbps). Power management features three low-power modes and a low-power timer active during software standby - essential for battery-backed or energy-harvested sensor nodes.

Key Specifications

Pinout & Package

Packaged in a 40-pin HWQFN (PWQN0040KD-A), 6 × 6 mm, 0.5 mm pitch, with exposed thermal pad. Pinout supports 13 general-purpose I/Os (5-V tolerant, open-drain, pull-up), 2 HVAIN pins (±10-V analog input), AVCC0/AVSS0 power rails, dedicated excitation current outputs (IEXC0/IEXC1), and CANH/CANL differential pair.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F523E5KDNF#20, R5F523E5KDFM offers greater I/O and peripheral headroom at the cost of PCB area, while R5F523E5KGNF delivers identical functionality with extended temperature resilience - making it the only true pin-compatible alternative for harsh thermal environments.

Availability

R5F523E5KDNF#20 is available at Aetrix Electronics and suitable for industrial sensor interfaces, smart field transmitters, and DIN-rail analog input modules requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for production ramp.

Supply support for R5F523E5KDNF#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 infrastructure markets.

The RX23E-B Group - including R5F523E5KDNF#20 - was designed specifically for high-accuracy sensor signal acquisition in industrial automation, featuring integrated 24-bit delta-sigma ADCs, programmable gain amplifiers, and excitation sources to replace multi-chip analog front-ends.

FAQ

What is the maximum sampling rate of the 24-bit delta-sigma ADC in R5F523E5KDNF#20?

The R5F523E5KDNF#20 supports a maximum delta-sigma ADC sampling rate of 125 kSPS. This is achieved with reduced effective resolution (e.g., ~16-bit at full speed) and is configurable via modulator clock (fMOD = 4 MHz) and sinc filter order selection. At lower rates like 3.8 SPS, it achieves 24-bit effective resolution with simultaneous 50/60 Hz rejection.

Does R5F523E5KDNF#20 support ±10-V analog inputs, and how are they implemented?

Yes, R5F523E5KDNF#20 supports ±10-V analog inputs via dedicated HVAIN0 and HVAIN1 pins. These pins connect directly to the 24-bit delta-sigma ADC's input multiplexer and are electrically isolated from standard I/O voltage domains. The ±10-V range is enabled by internal protection circuitry and rail-to-rail PGA front-end - eliminating external level-shifting components for industrial bridge and voltage sensor interfaces.

What are the excitation current source specifications for RTD measurement in R5F523E5KDNF#20?

R5F523E5KDNF#20 integrates two independent excitation current sources (IEXC0/IEXC1) with programmable output from 50 µA to 1000 µA in six discrete steps. They feature ±0.2% current matching and 5 ppm/°C drift matching - critical for accurate 3-/4-wire RTD measurements. Each source can drive up to 30 mA into loads, supporting common Pt100/Pt1000 configurations without external current DACs.

Is R5F523E5KDNF#20 pin-compatible with other members of the RX23E-B family in the same package?

Yes, all RX23E-B variants in the 40-pin HWQFN (PWQN0040KD-A) package - including R5F523E5KDNF#20, R5F523E5BDNF#20, and R5F523E5MDNF#20 - share identical pinouts and mechanical footprint. Differences lie in analog input range (K = ±10 V, B = ±5 V, M = 31.25 kSPS mode), memory size, and temperature grade - enabling hardware reuse across product variants with firmware configuration.

Does R5F523E5KDNF#20 include built-in support for IEC 60730 functional safety compliance?

Yes, R5F523E5KDNF#20 includes hardware-assisted IEC 60730 compliance features: self-diagnostic routines for the ADC, clock frequency accuracy measurement circuit (CAC), independent watchdog timer (IWDT), RAM test assistance via the data operation circuit (DOC), and analog input disconnect detection. These reduce software validation effort and accelerate Class B certification for household and industrial appliances.