Overview
Description
The RX23E-B Digital Load Cell Tiny Board Reference Design is a compact and efficient solution for digital load cell design that utilizes the RX23E-B 32-bit microcontroller. This microcontroller integrates a high-speed, high-precision analog front-end (AFE), which negates the necessity for a dedicated AFE, thereby minimizing the board size.
Since the load cell is integrated with the board on which the AFE or MCU is mounted, the board must be compact. The RX23E-B combines an AFE and MCU on a single chip, eliminating the need for a dedicated AFE and making it suitable for board miniaturization. For this reference design, we designed a tiny 22mm × 16mm board. In addition to the RX23E-B, this compact board includes the RAA788155 RS-485/RS-422 transceiver. The RX23E-B performs A/D conversion, digital filtering, calibration, and voltage-to-weight conversion. The RAA788155 sends the weight value to the host device via digital communication, such as Modbus.
When developing this reference design, we incorporated this tiny board into the load cell and evaluated the weight measurement error. The gravimetric error is ±0.01%FS. In addition, we evaluated the resolution using a calibration strain generator under conditions of 10 SPS output data rate and 128x PGA gain. We confirmed that the input-referred voltage noise was 23.8nVrms and the peak-to-peak voltage noise was 140nV.
Features
- Tiny board size of 22mm x 16mm
- Board can be mounted on load cells
- RX23E-B microcontroller with built-in high-precision analog front-end (AFE)
- Eliminates the need for a dedicated AFE, contributing to reductions in BOM cost and board space
- Enables highly accurate load measurement, including digital filtering and calibration with a single chip
- Integrated RAA788155 RS-485/RS-422 transceiver
- Digital communication such as Modbus is possible
- Contents
- Application notes
- Sample program
- Schematic (included in the application note)
- Bill of Materials (BOM) (included in the application note)
- Board data
Applications
Documentation
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| PCB Design Files | RX23E-B-QFN40-WT Reference Design Files
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| Application Note |
PDF
2.96 MB
日本語
AI-generated Summary:
The RX23E-B-QFN40-WT board integrates the RX23E-B MCU with an analog front end (AFE), LDO power supply, and RS-485 driver to enable precise weight measurement using a digital load cell. The sample program supports communication via QE for AFE or Modbus RTU over RS-485, allowing configuration, calibration, zero reset, and data acquisition. Measurement accuracy is validated with a 300g rated capacity load cell, achieving low noise and minimal non-linearity. The document details hardware specifications, communication protocols, sample program functions, and evaluation results, providing a comprehensive guide for implementing compact digital load cell systems with Renesas MCUs. PCB design files include BOM, schematic, and pattern diagrams.
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Design & Development
Sample Code
Related Boards & Kits
Boards & Kits
Renesas Solution Starter Kit for RX23E-B
The Renesas Solution Starter Kit for RX23E-B is an evaluation tool designed for sensor measurement using the RX23E-B 32-bit microcontroller (MCU). The kit includes an RX23E-B MCU evaluation board equipped with peripherals for sensor measurements and software that can be downloaded from our... Read More
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- Availability of RX23E tiny board for development
Hello i would require RX23E Tiny Board for my product development. kindly let me know the availability of this tiny board for purchase
Jan 10, 2026
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