Renesas R5F523E5MDNF#40

Overview

R5F523E5MDNF#40 from Renesas is a 32-bit RXv2 microcontroller optimized for high-precision analog measurement in industrial sensor nodes and smart transmitters, featuring a 32-MHz CPU core, 128-KB flash, 16-KB SRAM, 8-KB data flash, integrated 24-bit delta-sigma ADC (31.25 kSPS max, ±5-V input range), rail-to-rail programmable gain instrumentation amplifier (gain = 1–128), and on-chip excitation current sources (50–1000 µA) - deployed in 40-pin HWQFN (6 × 6 mm, 0.5 mm pitch) for compact industrial I/O modules.

For engineers reviewing the R5F523E5MDNF#40 datasheet, R5F523E5MDNF#40 pinout, R5F523E5MDNF#40 application, or R5F523E5MDNF#40 equivalent, this MCU delivers calibrated low-drift analog front-end performance with CAN, SCI, and RSPI interfaces - critical for load cell, pressure sensor, and RTD signal conditioning where resolution, offset drift (4 nV/°C), and system-level diagnostics (IEC60730 support) are design-critical.

Technical Context

The R5F523E5MDNF#40 implements the RXv2 CPU core with IEEE 754-compliant 32-bit FPU and DSP extensions, operating at up to 32 MHz with zero-wait-state access to on-chip memory. Its analog subsystem centers on a single 24-bit delta-sigma ADC unit with fourth- or fifth-order sinc filtering, programmable data rate (3.8 SPS to 31.25 kSPS), and ±5-V HVAIN input capability - paired with two independent excitation current sources and a 2.5-V low-drift voltage reference (8 ppm/°C).

Timing and control are managed via dedicated peripherals: MTU2a (6-channel 16-bit timer), CMT (2-channel 16-bit compare match), LPT (16-bit low-power timer active in software standby), and ELC for interrupt-free inter-module event linking. Power management includes three low-power modes, LVD with 14-level detection, and operation from 1.8–5.5 V.

Key Specifications

Pinout & Package

PWQN0040KD-A is a 40-pin HWQFN package (6 × 6 mm, 0.5 mm pitch) with exposed thermal pad, rated for –40°C to +85°C operation (D version). It provides 13 general-purpose I/O pins, 1 dedicated input pin, 14 pull-up resistors, and 13 open-drain outputs - supporting compact sensor interface designs with minimal external components.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F523E5BDNF#40 and R5F523E5KDNF#40, the R5F523E5MDNF#40 trades maximum sampling rate and input range for lower power consumption and reduced thermal load in space-constrained 40-pin designs - making it ideal for battery-powered or thermally sensitive sensor nodes where 31.25 kSPS meets application requirements.

Availability

R5F523E5MDNF#40 is available at Aetrix Electronics and suitable for industrial sensor transmitters, smart pressure modules, RTD temperature transmitters, and multi-sensor I/O modules requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for safety-certified designs.

Supply support for R5F523E5MDNF#40 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 - delivering high-reliability, functionally safe, and energy-efficient silicon.

The RX23E-B Group targets high-accuracy sensor signal conditioning applications, integrating precision analog front-ends with robust MCU functionality to replace multi-chip solutions in industrial automation, test equipment, and smart field devices.

FAQ

What is the maximum sampling rate supported by the 24-bit delta-sigma ADC in R5F523E5MDNF#40?

The R5F523E5MDNF#40 supports a maximum delta-sigma ADC sampling rate of 31.25 kSPS. This is confirmed in Table 1.3 of the datasheet (R01DS0402EJ0100 Rev.1.00), where the "M" suffix denotes the 31.25 kSPS variant with ±5-V input range. Higher rates (125 kSPS) require part numbers with "B", "J", "K", or "L" suffixes.

Does R5F523E5MDNF#40 include an integrated voltage reference, and what is its accuracy?

Yes, the R5F523E5MDNF#40 integrates a 2.5-V voltage reference with 8 ppm/°C temperature drift over –40°C to +85°C. This reference is used by the 24-bit delta-sigma ADC and can also be supplied externally via VREFH/VREFL pins. The specification is documented on page 5 of the datasheet under "Analog front end (AFEA)".

Can R5F523E5MDNF#40 drive a 4-wire RTD sensor, and how are the excitation currents configured?

Yes, the R5F523E5MDNF#40 supports 4-wire RTD measurement using its two independent excitation current sources (IEXC0 and IEXC1), each configurable from 50 µA to 1000 µA in six discrete steps. Current matching is ±0.2% and drift matching is 5 ppm/°C - enabling accurate ratiometric measurements without external current sources. Configuration is performed via the AFEA registers.

Is the R5F523E5MDNF#40 pin-compatible with other members of the RX23E-B family in the same 40-pin HWQFN package?

Yes, all RX23E-B 40-pin HWQFN variants - including R5F523E5BDNF#40, R5F523E5KDNF#40, and R5F523E5MDNF#40 - share identical pinouts and mechanical footprint (PWQN0040KD-A). Functional differences (e.g., DSAD speed, input range) are implemented internally and do not affect PCB layout or signal routing.

What IEC60730 compliance features are implemented in R5F523E5MDNF#40 for functional safety certification?

The R5F523E5MDNF#40 includes hardware-assisted self-diagnostic features for the A/D converter (offset/gain calibration, disconnect detection), clock frequency accuracy measurement circuit (CAC), independent watchdog timer (IWDT), RAM testing (via DOC), and analog voltage detectors - all documented in the "Useful functions for IEC60730 compliance" section (page 1) of the datasheet.