Renesas R5F523E5KDNF#40

Overview

R5F523E5KDNF#40 from Renesas is a 32-bit RXv2 microcontroller optimized for high-precision analog measurement in industrial sensing systems, featuring a 24-bit delta-sigma ADC with ±10-V input capability, 128 KB flash, 16 KB SRAM, 32 MHz CPU operation, and integrated programmable gain instrumentation amplifier (PGA) with 11 nVRMS noise at gain=128.

For engineers reviewing the R5F523E5KDNF#40 datasheet, R5F523E5KDNF#40 pinout, R5F523E5KDNF#40 application, or R5F523E5KDNF#40 equivalent, this MCU is selected for high-accuracy weight scales, strain gauge interfaces, and precision process transmitters requiring simultaneous 50/60 Hz rejection, on-chip excitation current sources, and IEC60730-compliant self-diagnostic functions.

Technical Context

The R5F523E5KDNF#40 implements a CISC Harvard architecture with 5-stage pipeline and variable-length instructions, delivering 64 DMIPS at 32 MHz while supporting IEEE754-compliant single-precision FPU and 32-bit multiply-accumulate DSP operations. Its analog subsystem centers on the DSADB module synchronized to PCLKC (≤16 MHz), enabling configurable sinc filter chains and background operation (BGO) for data flash writes during conversion.

Real-time control is enabled by the ELC, which routes event signals-such as timer overflows or ADC completion-to peripheral modules without CPU intervention, allowing linked operation (e.g., MTU-triggered DSAD start) during deep sleep. The device supports three low-power modes, including software standby with active LPT and IWDT driven by dedicated 15-kHz oscillator.

Key Specifications

Pinout & Package

Packaged in a 40-pin HWQFN (PWQN0040KD-A), the R5F523E5KDNF#40 features 13 general-purpose I/O pins (5-V tolerant, open-drain capable), dedicated HVAIN0–HVAIN1 ±10-V analog inputs, AVCC0/AVSS0 power rails for analog section, VREF output (2.5 V), VBIAS generator, and IEXC0/IEXC1 excitation current outputs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F523E5KDNF#40, R5F523E5KDFM#30 offers expanded I/O and RTC at the cost of larger package and higher pin count, while R5F523E5KGNF#40 provides identical functionality with extended temperature qualification-enabling drop-in replacement in thermally demanding deployments without design revision.

Availability

R5F523E5KDNF#40 is available at Aetrix Electronics and suitable for industrial weight scales, strain gauge transmitters, and process temperature transmitters requiring stable component supply, long-lifecycle assurance, and traceable sourcing for safety-critical production.

Supply support for R5F523E5KDNF#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 IoT applications.

The RX23E-B Group-including R5F523E5KDNF#40-is designed specifically for high-accuracy sensor signal conditioning in industrial automation, offering integrated delta-sigma ADCs, excitation sources, and functional safety features aligned with IEC60730 Class B.

FAQ

What is the maximum sampling rate of the 24-bit delta-sigma ADC in R5F523E5KDNF#40?

The R5F523E5KDNF#40 supports a maximum sampling rate of 125 kSPS for its 24-bit delta-sigma ADC (DSADB). This rate is achievable with reduced effective resolution and specific sinc filter configurations; at 3.8 SPS, it delivers 24-bit effective resolution with simultaneous 50/60 Hz rejection. The modulator clock is fixed at 4 MHz (typical), and oversampling ratios range from 32 to 1,048,576 depending on data rate selection.

Does R5F523E5KDNF#40 include an integrated voltage reference, and what is its accuracy?

Yes, R5F523E5KDNF#40 integrates a precision voltage reference (VREF) with nominal output of 2.5 V, temperature drift of 8 ppm/°C over –40°C to +85°C, and ±10 mA output current capability. This reference is used internally by the DSADB and S12ADE converters and can also be routed externally. It is factory-trimmed and does not require external calibration for typical metrology-grade applications.

Can R5F523E5KDNF#40 operate with a single 3.3-V supply, and what are the implications for analog performance?

R5F523E5KDNF#40 operates from a single 1.8–5.5-V VCC supply, so 3.3 V is fully supported. However, AVCC0 must be ≥4.5 V for full DSADB performance (e.g., 24-bit resolution at 3.8 SPS); at 3.3 V AVCC0, only the 12-bit S12ADE remains fully functional. For optimal 24-bit ADC accuracy, separate 5-V analog rail regulation is recommended, as specified in the datasheet's power supply requirements.

How many excitation current sources does R5F523E5KDNF#40 provide, and what are their key specifications?

R5F523E5KDNF#40 provides two independent excitation current sources (IEXC0 and IEXC1), each programmable from 50 µA to 1000 µA in six discrete steps. They feature ±0.2% current matching and 5 ppm/°C drift matching-critical for ratiometric measurements with RTDs or 4-wire strain gauges. Both sources support disconnect detection and can be gated via the low-side switch (LSW) for power cycling.

Is R5F523E5KDNF#40 pin-compatible with other members of the RX23E-B family, such as R5F523E5KDFM#30?

No, R5F523E5KDNF#40 (40-pin HWQFN) is not pin-compatible with R5F523E5KDFM#30 (64-pin LFQFP); they differ in package type, pin count, and physical dimensions. While both share identical analog peripheral functionality (±10-V HVAIN, dual IEXC, DSADB), the pin mapping, power distribution, and I/O allocation are incompatible. Migration requires PCB redesign and layout adaptation.