Renesas R5F523E5NDBS#20

Overview

R5F523E5NDBS#20 from Renesas is a 32-bit RXv2 microcontroller optimized for high-precision analog measurement in industrial sensing applications. It integrates a 24-bit delta-sigma ADC with 31.25 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 a low-drift 2.5-V voltage reference (8 ppm/°C). The MCU operates at up to 32 MHz, includes 128 KB flash, 16 KB SRAM, and supports CAN, SCI, I²C, and RSPI interfaces.

For engineers reviewing the R5F523E5NDBS#20 datasheet, R5F523E5NDBS#20 pinout, R5F523E5NDBS#20 application, or R5F523E5NDBS#20 equivalent, this device is selected for embedded systems requiring simultaneous high-resolution analog acquisition, real-time control, and functional safety support per IEC 60730 - especially in load cell, pressure transducer, and weigh scale signal conditioning designs.

Technical Context

The R5F523E5NDBS#20 implements the RXv2 CPU core with IEEE 754-compliant 32-bit FPU, memory protection unit (MPU), and event link controller (ELC) enabling interrupt-free peripheral coordination during CPU sleep. Its analog subsystem centers on the DSADB module, synchronized to PCLKC (≤16 MHz), with fourth- and fifth-order sinc digital filters, ±10-V-capable HVAIN pins (configured for ±5 V in this variant), and hardware-assisted disconnect detection for excitation current sources and reference voltage.

It features dual A/D subsystems: the 24-bit delta-sigma converter (DSADB) with BGO-capable 8-KB data flash for calibration storage, and an independent 12-bit S12ADE converter (8 channels, 1.4 µs conversion) for auxiliary monitoring. Clocking uses a PLL-fed system clock (ICLK ≤ 32 MHz), sub-clock RTC, and dedicated IWDT oscillator - all managed via LVDAb voltage detectors and software standby mode with active low-power timer (LPT).

Key Specifications

Pinout & Package

Package: PTBG0100KD-A - 100-pin TFBGA, 5.5 mm × 5.5 mm, 0.5 mm pitch, 0.45 mm height, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F523E5LDBS#20 and R5F523E5NDFP#20, the R5F523E5NDBS#20 provides identical analog performance and computational capability in the smallest industrial-grade package (5.5×5.5 mm), making it optimal for compact, high-density sensor modules where board area and thermal profile are constrained.

Availability

R5F523E5NDBS#20 is available at Aetrix Electronics and suitable for industrial weigh scales, pressure transmitters, and RTD temperature monitors requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for ISO 9001-certified manufacturing.

Supply support for R5F523E5NDBS#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 - including R5F523E5NDBS#20 - was designed specifically for high-accuracy sensor signal conditioning, integrating metrology-grade analog peripherals with real-time control and functional safety features in a single chip.

FAQ

What is the maximum sampling rate of the 24-bit delta-sigma ADC in R5F523E5NDBS#20?

The R5F523E5NDBS#20 supports a maximum sampling rate of 31.25 kSPS for its 24-bit delta-sigma ADC (DSADB). This rate is achieved with a 4-MHz modulator clock and specific sinc filter configurations - notably the fourth-order sinc filter alone. Higher rates (up to 125 kSPS) are available only on variants with 'L' or 'K' suffixes (e.g., R5F523E5LDBS#20), not on the 'N' variant.

Does R5F523E5NDBS#20 include a built-in voltage reference, and what are its key specifications?

Yes, the R5F523E5NDBS#20 integrates a precision 2.5-V voltage reference with 8 ppm/°C temperature drift over –40°C to +85°C, ±10 mA output current capability, and fault detection circuitry. This reference can be used directly by the 24-bit delta-sigma ADC and 12-bit ADC, or bypassed in favor of an external reference applied to the VREFH/VREFL pins.

Can R5F523E5NDBS#20 drive an LCD panel, and how does it differ from other RX23E-B variants?

No, the R5F523E5NDBS#20 does not include an LCD controller/driver. Per Renesas' part numbering scheme, the 'N' suffix indicates the 24-bit ADC variant with 31.25 kSPS sampling and ±5-V input range but excludes LCD functionality. Variants with 'J' or 'L' suffixes (e.g., R5F523E5JDFN#20) include the LCDC peripheral - confirming LCD support is absent in R5F523E5NDBS#20.

What communication interfaces are available on R5F523E5NDBS#20, and which support automotive protocols?

The R5F523E5NDBS#20 includes CAN (RSCAN, ISO 11898-1 compliant, 1 Mbps), up to seven SCI channels (including SCIh with LIN protocol support), one I²C bus interface (400 kbps, SMBus compatible), and one RSPI channel (16 Mbps). The SCIh module explicitly supports LIN frame formatting, making R5F523E5NDBS#20 suitable for automotive body electronics and diagnostic interfaces.

How does the R5F523E5NDBS#20 support functional safety standards like IEC 60730?

The R5F523E5NDBS#20 includes hardware-assisted self-test features for IEC 60730 Class B compliance: ADC self-diagnostic and disconnect detection, clock frequency accuracy measurement (CAC), independent watchdog timer (IWDT) with dedicated oscillator, RAM test assistance via data operation circuit (DOC), and voltage detector (VDET) for analog supply monitoring - all documented in Renesas Application Note R01AN3917.