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
- Realizes a 22mm x 16mm small board
- Small enough to be incorporated into a digital load cell
- 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
- 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
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Type | Title | Date |
Manual - Hardware | PDF 1.03 MB 日本語 | |
1 item
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Design & Development
Software & Tools
Related Boards & Kits
Renesas Solution Starter Kit for RX23E-A
Using the evaluation board (RSSK RX23E-A) equipped with RX23E-A and peripheral circuits for sensor measurement, and software that can be downloaded from the web, you can start analog characteristic evaluation immediately after purchasing the kit. By using this kit, it is possible to shorten the...