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Overview

Description

This is a reference design of a digital load cell using an MCU with a high-precision analog front-end (AFE), the RX23E-A. Using the RX23E-A makes an external dedicated AFE unnecessary, thereby miniaturizing the board.

In the digital load cell, a board mounting ADC and MCU, and a load cell are combined into a single unit, accordingly, the board is required to be small. RX23E-A realizes MCU and AFE on a single chip, not requiring an external dedicated AFE, thereby suitable to miniaturize a board. This reference design is a design for a 22×16-millimeter small board that can be combined with a load cell. This tiny board incorporates an RS-485/RS-422 transceiver, ISL3152E, as well as RX23E-A. RX23E-A performs A/D conversion, digital filter processing, calibration, and physical quantity conversion (Voltage to Weight) on a single chip. ISL3152E transmits weight values to host devices with digital communication, such as Modbus. When creating this reference design, we evaluated weight measurement errors by incorporating this small board into a load cell. Non-linear errors of the weight measurement are within ±0.01%FS. Accordingly, it is confirmed that the precision specifications of a general load cell are well satisfied

Features

  1. Realizes a 22mm x 16mm small board
    • Small enough to be incorporated into a digital load cell
  2. Mounts MCU with high-precision AFE, RX23E-A
    • Does not require an external dedicated AFE, contributing to the reduction in BOM cost and board mounting area
    • A single RX23E-A chip realizes high-precision weight measurement, including digital filter processing and calibration
  3. Mounts RS-485/RS-422 transceiver, ISL3152E
    • Enables digital communication, such as Modbus

Components

  • Application note
  • Circuit diagram (included in application note)
  • BOM (included in application note)
  • Gerber Files

Applications

Documentation

Type Title Date
Manual - Hardware PDF 1.03 MB 日本語
1 item

Design & Development

Software & Tools

Software Downloads

Type Title Date
PCB Design Files Log in to Download ZIP 1.18 MB 日本語 Function: Application Example
1 item

Related Boards & Kits

Videos & Training

RX23E-A Digital Loadcell Solution