Renesas RSSKRX23E-A User Manual

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All information contained in these materials, including products and product specifications,

website (http://www.renesas.com).

RSSKRX23E-A

User’s Manual

Rev.1.10 Mar 2020

User’ s Manual

www.renesas.com

represents information on the product at the time of publication and is subject to change by Renesas Electronics Corp. without notice. Please review the latest information published by Renesas Electronics Corp. through various means, including the Renesas Electronics Corp.

Corporate Headquarters

Contact information

Trademarks

Notice

1. Descriptions of circuits, software and other related information in this document are provided only to illustrate the operation of semiconductor products and application examples. You are fully responsible for the incorporation or any other use of the circuits, softw are, and information in the design of your product or system. Renesas Electronics disclaims any and all liability for any losses and damages incurred by you or third parties arising from the use of these circuits, software, or information.

2. Renesas Electronics hereby expressly disclaims any warranties against and liability for infringement or any other claims involving patents, copyrights, or other intellectual property rights of third parties, by or arising from the use of Renesas Electronics products or technical information described in this document, including but not limited to, the product data, drawings, charts, programs, algorithms, and applicati on examples.

3. No license, express, implied or otherwise, is granted hereby under any patents, copyrights or other intellectual property rights of Renesas Electronics or others.

4. You shall not alter, modify, copy, or reverse engineer any Renesas Electronics product, whether in whole or in part. Renesas Electronics disclaims any and all liability for any losses or dam ages incurred by you or third parties arising from such alteration, modification, copying or reverse engineering.

5. Renesas Electronics products are classified according to the following two quality grades: “Standard” and “High Quality”. The intended applications for each Renesas Electronics product depends on the product’s quality grade, as indicated below. "Standard": Computers; office equipment; communications equipment; test and measurement equipment; audio and visual equipment; home

"High Quality": Transportation equipment (automobiles, trains, ships, etc.); traffic control (traffic lights); large-scale communication equipment; key

Unless expressly designated as a high reliability product or a product for harsh environments in a Renesas Electronics data sheet or other Renesas Electronics document, Renesas Electronics products are not intended or authorized for use in products or systems that may pose a direct threat to human life or bodily injury (artificial life support devices or systems; surgical implantations; etc.), or may cause serious property damage (space system; undersea repeaters; nuclear power control systems; aircraft control systems; key plant systems; military equipment; etc.). Renesas Electronics disclaims any and all liability for any damages or losses incurred by you or any third parties arising from the use of any Renesas Electronics product that is inconsistent with any Renesas Electronics data sheet, user’s manual or other Renesas Electronics document.

6. When using Renesas Electronics products, refer to the latest product information (data sheets, user’s manuals, application notes, “General Notes for Handling and Using Semiconductor Devices” in the reliability handbook, etc.), and ensure that usage conditions are within the ranges specified by Renesas Electronics with respect to maximum ratings, operating power supply voltage range, heat dissipation characteristics, installation, etc. Renesas Electronics disclaims any and all liability for any malfunctions, failure or accident arising out of the use of Renesas Electronics products outside of such specified ranges.

7. Although Renesas Electronics endeavors to improve the quality and reliability of Renesas Electronics products, semiconductor products have specific characteristics, such as the occurrence of failure at a certain rate and malfunctions under certain use conditions. Unless designated as a high reliability product or a product for harsh environments in a Renesas Electronics data sheet or other Renesas Electronics document, Renesas Electronics products are not subject to radiation resistance design. You are responsible for implementing safety measures to guard against the possibility of bodily injury, injury or damage caused by fire, and/or danger to the public in the event of a failure or malfunction of Renesas Electronics products, such as safety design for hardware and software, including but not limited to redundancy, fire control and malfunction prevention, appropriate treatment for aging degradation or any other appropriate measures. Because the evaluation of microcomputer software alone is very difficult and impractical, you are responsible for evaluating the safety of the final products or systems manufactured by you.

8. Please contact a Renesas Electronics sales office for details as to environmental matters such as the environmental compatibility of each Renesas Electronics product. You are responsible for carefully and sufficiently investigating applicable laws and regulations that regulate the inclusion or use of controlled substances, including without limitation, the EU RoHS Directive, and using Renesas Electronics products in compliance with all these applicable laws and regulations. Renesas Electronics disclaims any and all liability for damages or losses occurring as a result of your noncompliance with applicable law s and regulations.

9. Renesas Electronics products and technologies shall not be used for or incorporated into any products or systems whose manufacture, use, or sale is prohibited under any applicable domestic or foreign laws or regulations. You shall comply with any applicable export control laws and regulations promulgated and administered by the governments of any countries asserting jurisdiction over the parties or transactions.

10. It is the responsibility of the buyer or distributor of Renesas Electronics products, or any other party who distributes, disposes of, or otherwise sells or transfers the product to a third party, to notify such third party in advance of the contents and conditions set forth in this document.

11. This document shall not be reprinted, reproduced or duplicated in any form, in whole or in part, without prior written consent of Renesas Electronics.

12. Please contact a Renesas Electronics sales office if you have any questions regarding the information contained in this document or Renesas Electronics products.

(Note1) “Renesas Electronics” as used in this document means Renesas Electronics Corporation and also includes its directly or indirectly controlled

(Note2) “Renesas Electronics product(s)” means any product developed or manufactured by or for Renesas Electronics.

subsidiaries.

electronic appliances; machine tools; personal electronic equipment; industrial robots; etc.

financial terminal systems; safety control equipment; etc.

(Rev.4.0-1 November 2017)

TOYOSU FORESIA, 3-2-24 Toyosu, Koto-ku, Tokyo 135-0061, Japan

www.renesas.com

Renesas and the Renesas logo are trademarks of Renesas Electronics Corporation. All trademarks and registered trademarks are the property of their respective owners.

For further information on a product, technology, the most up-to-date version of a document, or your nearest sales office, please visit:

www.renesas.com/contact/

General Precautions in the Handling of Microprocessing Unit and Microcontroller Unit Products

The following usage notes are applicable to all Microprocessing unit and Microcontroller unit products from Renesas. For detailed usage notes on the products covered by this document, refer to the relevant sections of the document as well as any technical updates that have been issued for the products.

1. Precaution against Electrostatic Discharge (ESD)

A strong electrical field, when exposed to a CMOS device, can cause destruction of the gate oxide and ultimately degrade the device operation. Steps

must be taken to stop the generation of static electricity as much as possible, and quickly dissipate it when it occurs. Environmental control must be

adequate. When it is dry, a humidifier should be used. This is recommended to avoid using insulators that can easily build up static electricity.

Semiconductor devi ces must be stored and transported in an anti-static contai ner, static shielding bag or conductive material. All test and measurement

tools including work benches and floors must be grounded. The operator must also be grounded using a wrist strap. Semiconductor devices must not be

touched with bare hands. Similar precautions must be taken for printed circuit boards with mounted semiconductor devices.

2. Processing at power-on

The state of the product is undefined at the time when power is supplied. The states of internal circuits in the LSI are indeterminate and the states of

register settings and pins are undefined at the time when power is supplied. In a finished product where the reset signal is applied to the external reset

pin, the states of pins are not guaranteed from the time when power is supplied until the reset process is completed. In a similar way, the states of pins in

a product that is reset by an on-chip power-on reset function are not guaranteed from the time when power is supplied until the power reaches the level

at which resetting is specified.

3. Input of signal during power-off state

Do not input signals or an I/O pull-up power supply while the device is powered off. The current injection that results from input of such a signal or I/O

pull-up power supply may cause malfunction and the abnormal current that passes in the device at this time may cause degradation of internal elements.

Follow the guideline for input signal during power-off state as described in your product documentation.

4. Handling of unused pins

Handle unused pins in accordance with the directions given under handling of unused pins in the manual. The input pins of CMOS products are

generally in the high-impedance state. In operation with an unused pin in the open-circuit state, extra electromagnetic noise is induced in the vicinity of

the LSI, an associated shoot-through current flows internally, and malfunctions occur due to the false recognition of the pin state as an input signal

become possible.

5. Clock signals

After applying a reset, only release the reset line after the operating clock signal becomes stable. When switching the clock signal during program

execution, wait until the target clock signal is stabilized. When the clock signal is generated with an external resonator or from an external oscillator

during a reset, ensure that the reset line is only released after full stabilization of the clock signal. Additionally, when switching to a clock signal produced

with an external resonator or by an external oscillator while program execution is in progress, wait until the target clock signal is stable.

6. Voltage application waveform at input pin

Waveform distortion due to input noise or a reflected wave may cause malfunction. If the input of the CMOS device stays in the area between V

and V

(Min.) due to noise, for example, the device may malfunction. Take care to prevent chattering noise from entering the device when the input level

is fixed, and also in the transition period when the input level passes through the area between V

7. Prohibition of access to reserved addresses

Access to reserved addresses is prohibited. The reserved addresses are provided for possible future expansion of functions. Do not access these

addresses as the correct operation of the LSI is not guaranteed.

8. Differences between products

Before changing from one product to another, for example to a product with a different part number, confirm that the change will not lead to problems.

The characteristics of a microprocessing unit or microcontroller unit products in the same group but having a different part number might differ in terms of

internal memory capacity, layout pattern, and other factors, which can affect the ranges of electrical characteristics, such as characteristic values,

operating margins, immunity to noise, and amount of radiated noise. When changing to a product with a different part number, implement a system-

evaluation test for the given product.

(Max.) and VIH (Min.).

(Max.)

CAUTION

This is a ‘Class A’ (CISPR11:2009+A1:2010) equipment. This equipment can cause radio frequency noise when used in the residential area. In such cases, the user/operator of the equipment may be required to take appropriate countermeasures under his responsibility.

CAUTION

This equipment should be handled like a CMOS semiconductor device. The user must take all precautions to avoid build-up of static electricity while working with this equipment. All test and measurement tool including the workbench must be grounded. The user/operator must be grounded using the wrist strap. The connectors and/or device pins should not be touched with bare hands.

European Union Regulatory Notices:

The WEEE (Waste Electrical and Electronic Equipment) regulations put responsibilities on producers for the collection and recycling or disposal of electrical and electronic waste. Return of WEEE under these regulations is applicable in the European Union only. This equipment (including all accessories) is not intended for household use. After use the equipment cannot be disposed of as household waste, and the WEEE must be treated, recycled and disposed of in an environmentally sound manner. Renesas Electronics Europe GmbH can take back end of life equipment, register for this service at http://www.renesas.eu/weee

Disclaimer

By using this Renesas Solution Starter Kit (RSSK), the user accepts the following terms:

The RSSK is not guaranteed to be error free, and the entire risk as to the results and performance of the RSSK is assumed by the User. The RSSK is provided by Renesas on an “as is” basis without warranty of any kind whether express or implied, including but not limited to the implied warranties of satisfactory quality, fitness for a particular purpose, title and non-infringement of intellectual property rights with regard to the RSSK. Renesas expressly disclaims all such warranties. Renesas or its affiliates shall in no event be liable for any loss of profit, loss of data, loss of contract, loss of business, damage to reputation or goodwill, any economic loss, any reprogramming or recall costs (whether the foregoing losses are direct or indirect) nor shall Renesas or its affiliates be liable for any other direct or indirect special, incidental or consequential damages arising out of or in relation to the use of this RSSK, even if Renesas or its affiliates have been advised of the possibility of such damages.

Precautions

The following precautions should be observed when operating this RSSK:

This RSSK is only intended for use in a laboratory environment under ambient temperature and humidity conditions. A safe separation distance should be used between this and any sensitive equipment. Its use outside the laboratory, classroom, study area or similar such area invalidates conformity with the protection requirements of the Electromagnetic Compatibility Directive and could lead to prosecution.

The product generates, uses, and can radiate radio frequency energy and may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment causes harmful interference to radio or television reception, which can be determined by turning the equipment off or on, you are encouraged to try to correct the interference by one or more of the following measures;

• ensure attached cables do not lie across the equipment

• reorient the receiving antenna

• increase the distance between the equipment and the receiver

• connect the equipment into an outlet on a circuit different from that which the receiver is connected

• power down the equipment when not in use

• consult the dealer or an experienced radio/TV technician for help NOTE: It is recommended that wherever possible shielded interface cables are used.

The product is potentially susceptible to certain EMC phenomena. To mitigate against them it is recommended that the following measures be undertaken;

• The user is advised to use the cable that is less than 3m in length to be connected to the product

• The user is advised that mobile phones should not be used within 10m of the product when in use.

• The user is advised to take ESD precautions when handling the equipment.

The RSSK does not represent an ideal reference design for an end product and does not fulfil the regulatory standards for an end product.

How to Use This Manual

within the body of the text, at the end of each section, and in the Usage Notes section.

the manual for details.

User's Manual

Explanation of the RSSKRX23E-A

RSSKRX23E-A

Quick Start Guide

Provides simple instructions to setup

RSSKRX23E-A

R20QS0007EJ0100

User's Manual: Hardware

Explanation of RX23E-A hardware

RX23E-A Group User's

R01UH0801EJ0100

1. Purpose and Target Readers

This manual is provided to help the users understand the outline and electrical characteristics of the board of

Renesas Solution Starter Kit for RX23E-A (called “RSSKRX23E-A board” or “the board” below)

Although this manual contains an overview of the RSSKRX23E-A board functions, it is not written as a built-in

programming or hardware design guide.

Particular attention should be paid to the precautionary notes when using RSSKRX23E-A board. These notes occur

The revision history summarizes the locations of revisions and additions. It does not list all revisions. Refer to the text of

or Renesas Solution Starter Kit for RX23E-A the following documents are available. The newest versions of

the documents listed may be obtained from the Renesas Electronics Web site.

Document Type Description Document Title Document No.

R20UT4542EJ0110

board hardware specifications

the RSSKRX23E-A board and run PC tool program

PC Tool Program Explanation of PC tool program that

communicates with the RSSKRX23E-A board, sets the AFE/DSAD of RX23E-A, and obtains A/D conversion values

or specifications of RX23E-A: R5F523E6ADFL mounted on the board, the following documents are

User's Manual

Quick Start Guide

RSSKRX23E-A PC Tool Program Operation Manual

(this document)

R20AN0540EJ0110

available. The newest versions of the documents listed may be obtained from the Renesas Electronics Web

site.

specifications (pin layout, memory map, peripheral function specifications, electrical characteristics, and timing) and operation

* For details on how to use peripheral functions, refer to "Application Notes".

Manual: Hardware

2. For Your Safety

Do not fail to read this manual before using the board

• Follow the indications in this manual when using the board

• Keep this manual near the board so you can refer to it whenever necessary.

• Transfer or sale of the board to third parties is prohibited without written approval.

• The purchaser or importer of the board is responsible for ensuring compliance with local regulations.

In addition, the customer is responsible for ensuring that the board is handled correctly and safely, in

accordance with the laws of the customer’s country (region).

• The manual for the board, and specification (the documents) are the tool that was developed for

the function and performance evaluation of Renesas Electronics semiconductor device (Renesas Electronics

device) mounted on the board, and not guarantee the same quality, function and performance.

• By purchasing the board or downloading the documents from Renesas Electronics website, the support

services provided from Renesas Electronics is not guaranteed.

• All information contained in this manual represents information on products at the time of publication

of this manual. Please note that the product data, specification, sales offices, contents of website, address,

etc., are subject to change by Renesas Electronics Corporation without notice due to product improvements

or other reasons. Please confirm the latest information on Renesas Electronics website.

Meaning of Notations

is not specified.

static electricity

In this manual, items related to the safe use of the product are indicated as described below.

The degree of injury to persons or damage to property that could result if the designated content in this

manual is not followed is indicated as follows.

Warning

Caution

Note 1. Injury refers to conditions for which treatment would necessitate hospitalization or regular hospital

visits.

Note 2. Physical damage refers to damage affecting the wider surroundings, such as the user’s home or

property.

Requirements related to the handling of the product are classified into the following categories.

• Marks indicating that an action is prohibited.

General Prohibition The indicated action is prohibited.

• Marks indicating that an action is alerted

General Caution Indicates a general need for caution that

Indicates content that, if not followed, could result in death or serious injury to the user.

Indicates content that, if not followed, could result in injury*1 to persons or physical damage.*2

Example: Caution - Static Electricity! Indicates the possibility of injury due to

• Marks directing that the specified action is required.

General Instruction The specified action is required.

Example: Turn Off (Disconnect) Power Supply! Instructs the user to turn off (disconnect) the power supply to the product.

Warnings Regarding Use of the Product

Always insert plugs, connectors, and cables securely, and confirm that they are fully

• Incomplete connections could cause fire, burns, electric shock, or injury.

•

Disconnect the power supply and unplug all cables when the system will not be used for a

•

• This will protect the system against damage due to lightning.

Use a mechanism (switch, outlet, etc.) located within reach to turn off (disconnect) the power

• In case of emergency, it may be necessary to cut off the power supply quickly.

•

shock.

•

• The product may not perform as expected if used for other than its intended purpose.

Incorrect modification or retrofitting may cause heat generation and device failures.

• Failure to do so could cause overheating or malfunction.

• Failure to do so could cause device failures or malfunction by external noise.

•

 Danger Items

Warning

inserted.

Use the power supply apparatus specified in the manual.

Failure to do so could cause fire, burns, electric shock, injury, or malfunction.

period of time or when moving the system.

Failure to do so could cause fire, burns, electric shock, or malfunction.

supply.

Turn off the power supply immediately if you notice abnormal odor, smoke, abnormal sound, or overheating.

Continuing to use the system in an abnormal condition could cause fire, burns, or electric

Do not integrate the product or any part of it into other equipment. Do not insert or remove cables or connectors when the product is powered on.

The product has no safety case.

Failure to observe the above could cause fire, electric shock, burns, or malfunction.

 Caution Items

Before modifying any part of this product, carefully check the manual.

•

Follow the procedure specified in the manual when powering the system on or off.

Use the cable that is less than 3m in length to be connected to the product.

Caution

Caution – Static Electricity

Use the antistatic band. Failure to do so could cause malfunction or unstable motion.

3.List of Abbreviations and Acronyms

Abbreviation

Full Form / Description

ADC

Analog to Digital Converter

AFE

Analog Front End

AMUX

Analog Multiplexer

BUF

Buffer Amplifier

CAN

Controller Area Network

CPU

Central Processing Unit

DSAD

Delta-Sigma Analog-to-Digital Converter

E2 Lite

Renesas On-chip Debugging Emulator

Firmware

GUI

Graphical User Interface

I2C (IIC)

Philips™ Inter-Integrated Circuit Connection Bus

I/F

Interface

LDO

Low Dropout regulator

LED

Light Emitting Diode

LSW

Low Side Switch

MCU

Micro Controller Unit

Not Mounted

Personal Computer

PGA

Programmable Gain Amplifier

PROFIBUS DP

PROFIBUS Decentralized Peripherals

PWM

Pulse Width Modulation

RAM

Random Access Memory

ROM

Read Only Memory

RS-485

Recommended Standard 485

RTD

Resistance Temperature Detector

SARADC

Successive-Approximation-Register Analog-to-Digital Converter

SCI

Serial Communications Interface

SPI

Serial Peripheral Interface

UART

Universal Asynchronous Receiver/Transmitter

User’s Manual

USB

Universal Serial Bus

All trademarks and registered trademarks are the property of their respective owners.

Overview ........................................................................................................................................................ 1

1.1 Purpose ............................................................................................................................................................. 1

1.2 Mounted MCU ................................................................................................................................................... 1

1.3 Functions and Features .................................................................................................................................. 2

1.4 Specifications .................................................................................................................................................... 3

1.5 System Block Diagram .................................................................................................................................... 4

1.6 Overview and Layout ....................................................................................................................................... 5

2. Using the RSSKRX23E-A Board ................................................................................................................... 6

2.1 Operating Conditions ....................................................................................................................................... 6

2.2 Selecting Power Supplies ............................................................................................................................... 7

2.3 Connecting a PC to the Board ....................................................................................................................... 8

2.4 Using the Analog Input Circuit ........................................................................................................................ 9

2.4.1 Overview of the Analog Input Circuit .................................................................................................... 9

2.4.2 DSAD Measurement Circuit ................................................................................................................ 11

2.4.3 Thermocouple Measurement Circuit .................................................................................................. 12

2.4.4 Reference Junction Compensation Circuit Using the On-Board RTD .......................................... 13

2.4.5 Four-Wire RTD Measurement Circuit................................................................................................. 14

2.4.6 Three-Wire RTD Measurement Circuit .............................................................................................. 15

2.4.7 Strain Gage Measurement Circuit ...................................................................................................... 16

2.4.8 Handling Unused Pins in the Analog Input Circuit ........................................................................... 18

3. Microcontroller Peripheral Circuits .............................................................................................................. 19

3.1 USB Serial Communication Circuit .............................................................................................................. 19

3.2 Emulator Peripheral Circuit ........................................................................................................................... 20

3.3 RS-485 Communication Circuit .................................................................................................................... 21

3.4 CAN Communication Circuit ......................................................................................................................... 21

3.5 LED Circuit ...................................................................................................................................................... 22

3.6 Switch Input Circuit ........................................................................................................................................ 22

3.7 External Clock Input Circuit .......................................................................................................................... 23

4. Board Information ........................................................................................................................................ 24

4.1 Using Terminal Blocks ................................................................................................................................... 24

4.2 Connectors ...................................................................................................................................................... 25

4.3 Pin Headers for Communication Interfaces ............................................................................................... 29

4.4 Jumper Pins .................................................................................................................................................... 30

4.5 Universal Through-Holes .............................................................................................................................. 33

4.6 Through-Hole Taps ........................................................................................................................................ 36

4.7 Test Points ...................................................................................................................................................... 36

4.8 Short Pads....................................................................................................................................................... 37

4.9 Initial Settings of MCU Pins .......................................................................................................................... 38

Appendix ................................................................................................................................................................ i

Appendix 1. Board Diagrams ........................................................................................................................................ i

Appendix 2. Circuit Diagram ........................................................................................................................................ iv

Appendix 3. Parts List ................................................................................................................................................... vi

RSSKRX23E-A

MCU model name

R5F523E6ADFL

Number of bits

ROM

256 KB

Operating temperature range

-40 to +85°C

Renesas Solution Starter Kit for RX23E-A

1. Overview

1.1 Purpose

The board of Renesas Solution Starter Kit for RX23E-A (called “RSSKRX23E-A board” or “the board” below)

is an evaluation tool for the Renesas microcontroller RX23E-A. This manual describes the hardware aspect of

the RSSKRX23E-A board in detail. The manual also describes how to connect the board to a PC and sensors

for evaluation.

1.2 Mounted MCU

Table 1-1 lists the specifications of the MCU mounted on the board. The RX23E-A MCU mounted on the

board contains two low-noise 24-bit ∆-Σ A/D converters (DSADs). A DSAD contains a programmable gain

instrumentation amplifier (PGA). The gain can be selected from x1, x2, x4, x8, x16, x32, x64, and x128. It also

contains an analog front-end (AFE) circuit suitable for measuring sensors such as a thermocouple, RTD, and

strain gage. Up to 6 channels of measurement can be performed by switching the analog multiplexer (AMUX)

in the AFE.

For details on the MCU operating conditions, and DSAD and AFE settings, refer to “RX23E-A Group User's

Manual: Hardware”.

Table 1-1 Mounted MCU

Product group RX23E-A

Maximum CPU operating frequency 32 MHz

Package/number of pins LFQFP/48

RAM 32 KB

Storage temperature range -55 to +125°C

R20UT4542EJ0110 Rev.1.10 Page 1 of 39 Mar.30.20

RSSKRX23E-A 1. Overview

1.3 Functions and Features

The board has the following functions and features.

(1) Functions and features for hardware and system design engineers

• A/D converter evaluation circuit

• Thermocouple measurement circuit

• Resistance temperature detector (RTD) measurement circuit

• Strain gage measurement circuit

• Power supply selection circuit

• FW controlling DSAD and AFE operation

• Transmission of measurement results and reception of AFE settings using USB communication

(2) Functions and features for software design engineers

• RX23E-A programming and debugging

• Switches, LEDs, and other user interfaces

The board has all circuits required for microcontroller operation.

R20UT4542EJ0110 Rev.1.10 Page 2 of 39 Mar.30.20

RSSKRX23E-A 1. Overview

1.4 Specifications

Table 1-2 Specifications of the RSSKRX23E-A Board

Item Specification

Board model name RTK0ESXB10C00001BJ

MCU input clock 8-MHz external crystal oscillator

Applicable emulator E1, E2, and E2 Lite

Power input terminal block

Signal input terminal block CN2: Signal input terminal block (13-pin)

Analog power output terminal block CN1: Analog power output terminal block (2-pin)

Thermocouple connector CN3: Miniature thermocouple socket (2-pin) Material: copper-copper

Emulator connector CN7: 14-pin interface connector

On-board RTD Pt100 Class F0.3 (Class B) Model: PTS060301B100RP100

Connector CN6: USB serial communication connector USB mini-B

Driver U3: FT232RL

Connector J6: Pin header (3-pin 2.54mm pitch)

Driver U5: R2A25416SP

Connector J7: Pin header (3-pin 2.54mm pitch)

Driver ISL3159EFUZ

Communication interfaces

On-board LDO

USB

CAN

RS-485

Model ISL80410IBEZ

Device specifications

CN4: System power input terminal block (2-pin)

CN5: Analog power input terminal block (2-pin)

Operating voltage range: 6 to 40 V (Note) Output setting: 5 V (2.5 to 12 V variable output)

User interfaces

LEDs

Switches SW1: User switch SW2: External MCU reset switch

Universal through-holes

Board outline 120mm x 92mm

Operating temperature Room temperature

Operating humidity No condensation allowed

Note When the on-board LDO is used, the operating voltage range of this product is 6.5 to 12 V due to limitations of

peripheral components.

LED2: Power LED (VCC) Color: Green

LED1: User LED (PH2) Color: Red

2.54-mm pitch J1: 4-pin through holes J2: 12-pin through holes J3, J4: 10-pin through holes

R20UT4542EJ0110 Rev.1.10 Page 3 of 39 Mar.30.20

RSSKRX23E-A 1. Overview

RX23E-A

USB

mini B

Terminal

Bloc ks

USB

Se ri al

Conv erter

Crystal

Oscill ator

RX23E-A RSSK

The rmo coupl e

Connector

Em ula tor

Con nect or

User ’s Swi tch

RESET Swi tch

Passive

Filters

and

Sens or

Selection

Circuit s

Analog Plane Dig ital P la ne

Terminal

Bloc ks

User ’s

LED

Terminal

Bloc ks

Head ers

USB S erial

Comm unica tion

Analo g Power

Suppl y

LDO

AVCC0

VCC

CAN

Driv er

VLD O

Vd Vbus

UART Commun ication

Terminal

Bloc ks

VCC

E1, E2, E2 Lite

RS-485

Driv er

CAN C ommun icatio n

JP1 4

TXD1 R XD1 #RTS 1

Th ro ugh

Hole s

Th ro ugh

Hole s

Powe r

LED

MD/FI NED #RE S

Si gnals

Head ers

TXD1 RXD1

CTXD0 CRXD0

CTXD CRXD

Terminal

AV SS0

AVCC0

LSW

Analo g Si gnals

Exciting Voltage

Out put

Sens ors

Ther moco uple

Sy st e m Po w er

Suppl y

Vbus

JP1 5

RS-485

Comm unica tion

Shiel d wire

Analo g Signal

Refe rence Voltage

AVCC0

Univ ersa l

Th ro ugh

Hole s

CN1

CN2

CN3

CN5 CN4

TH1

J2, J3, J4

SW1

SW2

CN7

CN6

1.5 System Block Diagram

Figure 1-1 RSSKRX23E-A Board System Block Diagram

R20UT4542EJ0110 Rev.1.10 Page 4 of 39 Mar.30.20

RSSKRX23E-A 1. Overview

1.6 Overview and Layout

Figure 1-2 Overview of the RSSKRX23E-A Board (Front Side)

Figure 1-3 Overview of the RSSKRX23E-A Board (Back Side)

R20UT4542EJ0110 Rev.1.10 Page 5 of 39 Mar.30.20

RSSKRX23E-A 2. Using the RSSKRX23E-A Board

When analog and digital power

CN2

2. Using the RSSKRX23E-A Board

2.1 Operating Conditions

Table 2-1 lists the recommended operating conditions of the board.

Observe the recommended operating conditions when using the board. The use of the board without

observing any recommended operating condition may cause unpredictable operation. The use of the

board without observing any maximum rating may cause a failure or damage to the board.

Table 2-1 Recommended Operating Conditions

Condition: VSS = AVSS0 = 0 V

Recommended

Item Symbol Input pin

System power supply

Analog power supply

Digital pin VIN See Section 4.5. -0.3 to VCC + 0.3 Absolute maximum rating

Analog pin V

LSW pin I

Note 1. Operation of USB serial communication, CAN communication, and RS-485 communication are guaranteed

Note 2. Although the operating voltage of the LDO (ISL80410) is 6 to 40 V, the recommended LDO operating range

Note 3. Supply the power to VCC and AVCC0 simultaneously or sequentially in this order. Note 4. The R0N pin is connected to the LSW pin when pins 3 and 4 of JP7 are connected. Note 5. When pins 1 and 2 are connected, Vd is directly connected to VCC.

(VCC)

CN4

AVCC0 CN5

AIN

LSW

only in condition of inside recommended operating range (4.5~5.25V). RX23E-A can operate at 1.8 to 5.5 V.

on the board is 6.5 to 12 V, considering the capacitor rated voltage, power line voltage drop, and heat generation of the LDO.

When pins 5 and 6 are connected, VBUS (USB power supply) is connected to VCC.

(R0P, R0N, 0~9)

CN3

(AN10, AN11)

(LSW, R0N (Note 4))

operating

range

4.5 to 5.25 V (Note 1)

6.5 to 12 V (Note 2)

2.7 to 5.5 V (Note 3)

-0.3 to AVCC0 + 0.3 Absolute maximum rating

－ 30 mA When the LSW is switched ON

Maximum

rating

6.0 V

20 V

6.5 V

Condition

When the LDO is not used (when pins 1-2 or 5-6 of JP14 are connected) (Note 5)

When the LDO is used (when pins 5-6 of JP14 are connected)

supplies are separated (when pins 1-2 of JP14 are connected) and VCC > 2.7 V

R20UT4542EJ0110 Rev.1.10 Page 6 of 39 Mar.30.20

RSSKRX23E-A 2. Using the RSSKRX23E-A Board

Analog power

Separate analog/digital

Pins 2-3

USB operation for

Pins 1-2

Do not supply the

RX23E-A

Vbus

LDO

VLD O

JP1 4

JP1 5

Sy st e m P o we r Select Jumper

Analo g P ower

Select Jumper

Sy ste m Po wer Supply

USB B us Power

Analo g P ower Supp ly

VCC

E2 Lite

Emula tor Power Su pply

AVCC0

241

Vbus

CN7

CN8

CN4

CN5

2.2 Selecting Power Supplies

Figure 2-1 shows the power supply configuration of the board. Table 2-2 shows how to select each power

supply on the board. Before using a combination of power supplies not listed in Table 2-2, carefully check the

recommended operating conditions in Table 2-1.

Figure 2-1 Power Supply Configuration of the RSSKRX23E-A Board

Table 2-2 Power Selection Methods

Input power

supply

Vbus Vbus Vbus Pins 5-6

Emulator

Note 1. When connecting pins 2 and 3 of JP15, do NOT supply the power to Va. If the power is supplied to Va,

VCC and AVCC0 are connected on the board, resulting in a short-circuit between Va and VCC.

Note 2. The emulator power supply is connected to VCC. If pins 3 and 4 of JP14 are left connected and the power

is supplied from the emulator, voltage is applied to the output of U2 and U2 may be damaged. Never supply the power from the emulator when the pins are connected.

Digital power

supply VCC

supply

AVCC0

JP14

connection

Vd Vd Pins 1-2

Vd Va Pins 1-2 Pins 1-2

VLDO VLDO Pins 3-4

Emulator Emulator

Emulator Va

Pins 1-2 (Note 2)

(Note 2)

JP15

connection

Pins 2-3 (Note 1)

(Note 1)

Pins 2-3 (Note 1)

Pins 1-2

Remarks

Initial default setting

power supplies

simple check

Do not supply the power to Vd or Vbus.

power to Vd or Vbus.

R20UT4542EJ0110 Rev.1.10 Page 7 of 39 Mar.30.20

RSSKRX23E-A 2. Using the RSSKRX23E-A Board

When pins 1-2 are connected

When pins 2-3 are connected

USB serial

RSSKRX23E-A EVB

RX23E

USB-

mulator

Connector

USB 2.0FS

2.3 Connecting a PC to the Board

Figure 2-2 shows a configuration used when a PC is connected to the board. Table 2-3 lists functions

available when a PC is connected to the board.

When connecting a PC to the board, supply the power to the board as described in "2.2 Selecting Power

Supplies".

The board can be connected to the Renesas on-chip debugging emulator (E1, E2, E2 Lite) to debug user

code. When using the emulator, connect the 14-pin interface cable attached with the emulator to CN7. Before

supplying the power from the emulator, check that the following conditions are satisfied. If any of the

conditions is not satisfied, a failure may occur in the board, power supply, and/or emulator.

• The power is NOT supplied to VCC.

• Pins 3 and 4 of JP14 are NOT connected.

3.3-V power is supplied from E2 Lite. Note that USB serial communication, RS-485 communication, and CAN

communication do not operate. When using the emulator, refer to the user's manual of the emulator.

The board contains a USB serial conversion IC. SCI1 interface of the MCU and USB serial conversion IC are

connected and communication with a PC is available by USB serial communication. To use USB serial

communication, connect a USB cable to CN6 (USB mini-B connector).

For details on PC Tool Programs, refer to the “RSSKRX23E-A PC Tool Program Operation Manual”.

For details on the circuits around CN6 and CN7, see “3.1 USB Serial Communication Circuit” and “3.2

Emulator Peripheral Circuit”.

UART

COM

-A

I/F

Figure 2-2 Connecting a PC

Table 2-3 Functions Available When a PC Is Connected

Item Connected to

Emulator CN7 Disabled

communication

CN6 FW write via the SCI interface Communication with PC Tool Program

mini-B

USB

Emulator

JP17 connection and function

Code debugging FW write via the FINE interface

PC Tool

Program

R20UT4542EJ0110 Rev.1.10 Page 8 of 39 Mar.30.20

RSSKRX23E-A 2. Using the RSSKRX23E-A Board

2.4 Using the Analog Input Circuit

2.4.1 Overview of the Analog Input Circuit

The analog input circuit on the board has the following functions.

• DSAD measurement circuit

• Thermocouple measurement circuit

• Reference junction compensation circuit using the on-board RTD

• Four-wire RTD measurement circuit

• Three-wire RTD measurement circuit

• Strain gage measurement circuit

This manual covers the circuit configuration required for implementing each function and the relationship

between the DSAD measurement result and input signal in two’s complement format. For details on

processing for converting the DSAD measurement result to a physical quantity, refer to the application notes

related to sensor measurement.

To switch the function, it is necessary to change the jumper pin connection and DSAD and AFE settings. The

jumper pin connection and built-in FW are factory-set for the DSAD measurement circuit using AIN3 and AIN2

or AIN9 and AIN8.

Table 2-4 lists each function of the analog input circuit and corresponding jumper pin connection. Table 2-5

lists factory settings of the DSAD and AFE.

R20UT4542EJ0110 Rev.1.10 Page 9 of 39 Mar.30.20

RSSKRX23E-A 2. Using the RSSKRX23E-A Board

Connection

X X X X X X AIN3

AIN2

N/A

Thermocouple

Three-wire

AIN4(REF1N)

Strain gage

976.563

Table 2-4 Functions of the Analog Input Circuit and Corresponding Jumper Settings

Jumper pin connection Used pins of the MCU (pin function)

Function

Factory settings

DSAD measurement circuit

JP7 JP8 JP9 JP10 JP11 JP12

5-6 5-6 1-2

1-2 and

X X X X

3-4

1-2 and

3-4

1-2 and

3-4

1-2 N/A N/A N/A

1-2 AIN9 AIN8 N/A

Positive

side

input

Negative

side

input

Others

measurement

X X X X X X AIN11 AIN10 N/A

circuit

Reference junction compensation

X X 2-3

5-6 and

7-8

1-2 and

3-4

2-3 AIN7 AIN6

circuit

RTD measurement

X X 1-2

1-2 and

3-4

5-6 and

7-8

1-2 AIN7 AIN6

circuit

Four-wire RTD measurement circuit

measurement circuit

X X 1-2

3-4 or

5-6

5-6 X X X X AIN1 AIN0

1-2 and

3-4

1-2 and

3-4

1-2 AIN7 AIN6

X: Don't care N/A: Not applicable Note The thermocouple measurement circuit is independent of the JP7 to JP12 jumper pin connection.

Table 2-5 Factory Settings of the DSAD and AFE

Setting value

Item Symbol

Polarity DSAD0 DSAD1

Remarks

AIN4(REF1N)

AIN5(REF0N)

AIN9(IEXC)

AIN5(REF1P)

AIN8(IEXC) AIN9(IEXC)

AIN4(REF1N) AIN5(REF1P)

AIN9(IEXC)

REF0N,

REF0P

Note The bias voltage generator and excitation current source are not used in the factory setting.

R20UT4542EJ0110 Rev.1.10 Page 10 of 39 Mar.30.20

Measurement pin ―

Positive AIN3 AIN9

Negative AIN2 AIN8

Positive REFOUT REFOUT

Reference voltage VREF

Negative AVSS0 AVSS0

Gain GAIN ― 1x 1x

Data rate DR ―

SPS

Directly connected to the DSAD (Both the PGA and buffer amplifier are bypassed)

Internal reference voltage used. REFOUT: 2.5 Vtyp.

Oversampling ratio: 512

RSSKRX23E-A 2. Using the RSSKRX23E-A Board

AIN 2 (Lo)

U1 RX23 E-A

AIN 8 (Lo)

AIN9 (Hi)

AIN3 (Hi)

Volt age

Measurement

AIN

R10 (0Ω)

C23

C12

R11 (0Ω)

C11

R17 (0Ω)

C26

C18

R18 (0Ω)

C17

Commo n mode I np ut

123

567

1 2 3

JP1 2

JP1 1

Signal Inp ut

Volt age

Measurement

CN2

RSSKRX23E-A

2.4.2 DSAD Measurement Circuit

Figure 2-3 shows an example usage of the DSAD measurement circuit on the board.

Figure 2-3 Example Usage of DSAD Measurement Circuit

The FW built onto the board at shipment is set to measure the differential voltage between AIN3 and AIN2 and

that between AIN9 and AIN8 using two channels DSAD0 and DSAD1 in the MCU. The input voltage between

pins 3 and 2 of CN2 (between AIN3 and AIN2) and between pins 9 and 8 of CN2 (between AIN9 and AIN8)

are being used for the measurement. The differential input voltage VID can be obtained from the DSAD

measurement result ADDATA using the following expression.

Before applying voltage to the DSAD measurement circuit, check the following conditions. If either condition is not satisfied, measurement cannot be performed correctly.

The absolute input voltage range and differential voltage input range depend on the DSAD settings. For details, refer to "RX23E-A Group User's Manual: Hardware".

During evaluation with the DSAD measurement circuit, self-noise of the DSAD and PGA can be measured by short-circuiting input pins using JP2 and JP5. To short-circuit input pins, fix the input pin potential to satisfy condition (1). The PGA input bias current may cause the input pin potential to be outside the absolute input voltage range. Sample methods for fixing the input pin potential are listed below.

When using method (a) or (b) for measurement, check that the applied voltage is within the range of condition (1). Depending on connection, the differential input impedance becomes imbalanced, and the circuit may be susceptible to common mode noise.

R20UT4542EJ0110 Rev.1.10 Page 11 of 39 Mar.30.20

=

 × 2







[V]



(1) The voltage between each AIN and AVSS0 is within the absolute input voltage range for DASD measurement. (2) The voltage between AIN pins is within the differential voltage input range.

(a) Connect an external stable potential to one measurement pin. (b) Connect one measurement pin to GND via a resistor. (c) Apply bias voltage to one measurement pin using the AFE bias voltage generator.

RSSKRX23E-A 2. Using the RSSKRX23E-A Board

Thermocoupl e

AIN11 (Hi)

AIN 1 0 (Lo )

CN3

AIN 1 0 (Lo )

AIN11 (Hi)

R19

R20

C27

C20

C19

Thermocoupl e

Measurement

U1 RX23 E-A

RSSKRX23E-A

2.4.3 Thermocouple Measurement Circuit

Figure 2-4 shows the thermocouple measurement circuit on the board.

Figure 2-4 Thermocouple Measurement Circuit

CN3 is a connector socket on board the RSSKRX23E-A (material : copper-copper) used for the thermocouple

input pins. Thermocouple attached with the board can be connected to CN3 for measurement.

Connect the positive side of the thermocouple to AIN11 pin of CN3 and the negative side to AIN10 pin. The

output from the thermocouple (thermoelectromotive force) is input to AIN11 and AIN10 and the differential

voltage between AIN11 and AIN10 is measured with the DSAD. The thermoelectromotive force V

obtained from the DSAD measurement result AD

using the following expression.

DATA





 × 2







[]



For thermocouple measurement, fix the input pin potential. The PGA input bias current may cause the input

pin potential to be outside the absolute input voltage range.

Measuring a temperature with the thermocouple requires cold junction compensation or reference junction

compensation. The board enables reference junction compensation using the on-board RTD. For details on

the reference junction compensation circuit using the on-board RTD, see 2.4.4 “Reference Junction

Compensation Circuit Using the On-Board RTD”

TEMP

can be

R20UT4542EJ0110 Rev.1.10 Page 12 of 39 Mar.30.20

RSSKRX23E-A 2. Using the RSSKRX23E-A Board

R13

R14

C14

C13

Refe rence

Resistor

Ther moco upl e

AIN11 (Hi)

AIN 10 (L o)

REF1N(AIN4)

U1 RX23 E-A

CN3

AIN 10 (L o)

AIN11 (Hi)

IEXC0 (AIN9)

AIN8 (Unused)

R17 (0Ω)

C26

C18

R19

R20

C27

C20

C19

R18 (0Ω)

AIN 6 (Lo)

C25

RTD1 pt10 0

5.1kΩ

R12

390Ω

EXC0

Refe rence Buffer

Head room Res ist or

AIN7 (Hi)

REF 1P(A IN5)

R15

R16

C16

C15

C24

RTD

Measurement

Exci tation

Curr ent

Out put

Ther moco upl e

Measurement

Ext ernal

Refe rence

Inpu t

123

678

123

567

1 2 3

JP9

JP1 0

SO10

JP1 2

CN2

0.1% 15pp m

C17

AIN

JP1 1

RSSKRX23E-A

2.4.4 Reference Junction Compensation Circuit Using the On-Board RTD

Figure 2-5 shows the reference junction compensation circuit on the board.

On the board, the temperature near CN3 is detected with the on-chip resistance temperature detector, RTD1, for reference junction compensation for thermocouple measurement. For RTD1 measurement, a four-wire ratiometric measurement method is used. The excitation current I in the path shown by the arrow. The voltages at both ends of RTD1 are input to AIN7 and AIN6 and they are measured with the DSAD. The voltages at both ends of the reference resistor R4 are input to REF1P (AIN5) and REF1N (AIN4) and used as DSAD external reference voltages. The RTD1 resistance can be indicated using the DSAD measurement result AD



× 1 =



When I

is deleted from both sides,

EXC0

Figure 2-5 Reference Junction Compensation Circuit



× × 2







as shown below.

DATA



[]



EXC0

is output from AIN9 and is made to flow







[]

EXC0

1 =

With the above expression, the RTD1 resistance can be obtained independently of the excitation current I Use a built-in reference buffer (RBUF) with AFE for external reference inputs REF1N and REF1P. The use of

the RBUF can reduce the current input to the external reference input pin. Note that the use of the RBUF

narrows the absolute input voltage range for external reference. R12 is provided to make the voltages at both

ends of R4 fall within the absolute input voltage range for external reference when the RBUF is used.

× 2



R20UT4542EJ0110 Rev.1.10 Page 13 of 39 Mar.30.20

RSSKRX23E-A 2. Using the RSSKRX23E-A Board

R13

R14

C14

C13

Refe re nce

Resistor

REF1N(AIN4)

U1 RX23 E-A

IEXC0 (AIN9 )

AIN8 (Unused)

R17 (0Ω)

C26

C18

R18 (0Ω)

AIN 6 (L o)

C25

5.1kΩ

R12

390Ω

IEXC0

AIN7 (Hi)

REF 1P(AIN5)

R15

R16

C16

C15

C24

RTD

Measure ment

Exci tation

Curr en t

Out put

Ext ernal

Refe re nce

Inpu t

123

678

123

567

1 2 3

JP9

JP1 0

JP1 1

JP1 2

CN2

0.1% 15ppm

C17

4-wire

RTD

－

＋

AIN

SO10

RSSKRX23E

-A

Refe re nce Buff er

Headroom Res istor

2.4.5 Four-Wire RTD Measurement Circuit

Figure 2-6 shows the four-wire RTD measurement circuit on the board.

Figure 2-6 Four-Wire RTD Measurement Circuit

A configuration similar to that for on-board RTD measurement is used for four-wire RTD measurement.

Connect two pins of same polarity of a four-wire RTD to pins 9 (AIN9) and 7 (AIN7) of CN2 and two pins of the

other polarity to pins 6 (AIN6) and 5 (AIN5) of CN2. The excitation current I

made to flow in the path shown by the arrow. The voltages at both ends of the RTD are input to AIN7 and

AIN6 as detection signals and they are measured with the DSAD. The voltages at both ends of the reference

resistor R4 are input to REF1P (AIN5) and REF1N (AIN4) and used as DSAD external reference voltages.

The RTD resistance RTD



× 



When I

is deleted from both sides,

EXC0





With the above expression, the RTD resistance RTD

current I

EXC0

In the same way as for on-board RTD measurement, RBUF is used for external reference input.

R20UT4542EJ0110 Rev.1.10 Page 14 of 39 Mar.30.20



× 2



can be indicated using the DSAD measurement result AD

4-wire



× × 2











[]







[]

can be obtained independently of the excitation

4-wire

is output from AIN9 and is

EXC0

as shown below.

DATA

RSSKRX23E-A 2. Using the RSSKRX23E-A Board

R13

R14

C14

C13

Refe re nce

Resistor

REF1N(AIN4)

U1 RX23 E-A

IEXC0 (AIN9)

IEXC1

（AIN8）

R17 (0Ω)

C26

C18

R18 (0Ω)

AIN 6 (L o)

C25

5.1kΩ

R12

390Ω

IEXC0

AIN7 (Hi)

REF 1P(AIN5)

R15

R16

C16

C15

C24

RTD

Measurement

Exci tation

Curr en t

Out put

Ext ernal

Refe re nce

Inpu t

123

678

234

567

1 2 3

JP9

JP1 0

JP1 1

JP1 2

CN2

0.1% 15ppm

C17

3-wire

RTD

－

＋

AIN

IEXC1

RSSKRX23E

-A

Refe re nce Buff er

Headroom Res istor

2.4.6 Three-Wire RTD Measurement Circuit

Figure 2-7 shows the three-wire RTD measurement circuit on the board.

Figure 2-7 Three-Wire RTD Measurement Circuit

Connect one pin at one side of a three-wire RTD to pin 7 (AIN7) of CN2 and two pins of the other polarity to

pins 6 (AIN6) and 5 (AIN5) of CN2. The excitation currents I

are made to flow in the path shown by the arrow. The voltages at both ends of the RTD are input to AIN7 and

AIN6 as detection signals and they are measured with the DSAD. The voltages at both ends of the reference





× 

resistor R4 are input to REF1P (AIN5) and REF1N (AIN4) and used as DSAD external reference voltages.

The RTD resistance RTD

When 





With the above expression, when the excitation currents I

RTD

can be obtained independently of the excitation currents.

3-wire





× 4



+ 



) × × 2





+ 

[]



is indicated using the DSAD measurement result AD

3-wire

(



= 





, 







= 2 × 







. When I

[]

EXC0

EXC1

and I

EXC0

are output from AIN8 and AIN9 and

EXC0

DATA

is deleted from both sides,

are equal, the RTD resistance

EXC1

as shown below.

In the same way as for on-board RTD and four-wire RTD measurement, RBUF is used for external reference

input.

R20UT4542EJ0110 Rev.1.10 Page 15 of 39 Mar.30.20

RSSKRX23E-A 2. Using the RSSKRX23E-A Board

CN2

C21

R6(0 Ω)

R7(0

Ω)

REF 0N

U1 RX23 E-A

AIN 0 (L o)

C22

AIN1 (Hi)

REF 0P

C10

Strain Gauge

Measure ment

Ext ernal

Refe rence

R0N

R0P

JP7

AVCC0

LSW

LSW Low S ide Switch

2 4 6

JP8

2 4 6

EXC Lo

Str ain

Gauge

1-Gauge 4

-Wir e

AIN

EXC Hi

Si g na l Lo

Si g nal Hi

TH1

Shielded Wire

RSSKRX23E-A

2.4.7 Strain Gage Measurement Circuit

Figure 2-8 shows the measurement circuit for a strain gage (four-wire, single-gage method) on the board.

Figure 2-8 Strain Gage (Four-wire, Single-gage Method) Measurement Circuit

For the board, as an example of strain gage measurement, a measurement circuit for the four-wire, single-

gage method using a Wheatstone bridge is used.

Connect a strain gage that configured a bridge circuit to R0N pin (REF0N), R0P pin (REF0P), pin 0 (AIN0),

and pin 1 (AIN1) of CN2. Use AVCC0 and AVSS0 as excitation voltage sources to drive the bridge circuit. The

voltages of the output pins of the strain gage are input to AIN0 and AIN1 and the differential voltage is

measured with the DSAD. AVCC0 and AVSS0 are used as external reference inputs. When the strain gage

has a shielded wire, it can be connected to TH1 or the negative pin of CN1.

As an external reference input, LSW can be connect instead of AVSS0. The LSW pin is connected to AVSS0

via an analog switch in the MCU. This switch can be changed according to the MCU register setting. Power

supply to the strain gauge can be supplied by turning on the switch, and power supply to the strain gauge can

be stopped by turning off the switch. Supplying the power to the strain gage only during measurement can

reduce power consumption. The allowable current to the LSW pin is 30 mA. When using the LSW pin,

consider the allowable current.

If the LDO is used as the power supply for strain gage measurement (by connecting pins 3 and 4 of JP14), be

careful about the LDO output current. The maximum output current of the LDO mounted on the board,

ISL80410, is 150 mA. If current exceeding the maximum output current is required, do not use the

LDO.

R20UT4542EJ0110 Rev.1.10 Page 16 of 39 Mar.30.20

RSSKRX23E-A 2. Using the RSSKRX23E-A Board

In this circuit, the relationship between the differential voltage between AIN0 and AIN1 V

can be indicated using the gage coefficient K (strain gage sensitivity) as shown below.





×  ×  ×(0  0)[V]

The differential voltage V

can be indicated using the DSAD measurement result AD

strain

expression.





2 × (0  0)









When V

, AVCC0, and AVSS0 are deleted from the above two expressions, the strain ratio ε can be

strain

indicated with the following expression.

 =

2 × 4

 × 







and strain ratio ε

strain

with the following

DATA

R20UT4542EJ0110 Rev.1.10 Page 17 of 39 Mar.30.20

RSSKRX23E-A 2. Using the RSSKRX23E-A Board

Pin name

Handling result

Handling method

REF0N

Connected to AVSS0 directly or via a resistor.

Connect pins 5-6 of JP7.

LSW

Connected to AVSS0 directly or via a resistor.

2.4.8 Handling Unused Pins in the Analog Input Circuit

If there is an unused pin in the analog input circuit, handling the unused pin according to Table 2-6 is

recommended. If the unused pin is not handled accordingly, the circuit becomes susceptible to external noise

and static electricity, which may deteriorate performance and cause a failure.

Table 2-6 Handling Unused Pins in the Analog Input Circuit

REF0P Connected to AVCC0 directly or via a resistor. Connect pins 5-6 of JP8.

AIN0 to AIN11 Connected to AVSS0 directly or via a resistor.

Use a soldering side short pad (SO1-SO13) to connect the pin to AVSS0.

R20UT4542EJ0110 Rev.1.10 Page 18 of 39 Mar.30.20

RSSKRX23E-A 3. Microcontroller Peripheral Circuits

VSS

RX23E-A

TXD

VCC

R47

VCC

R60

R69

R64

R61

R65

RXD

RTS#

CTS #

CN6 USB mi ni-B

Vbus

(To JP14)

VSS

VBUS

GN D

USBDM

USBDP

VSS

VCC IO

VCC

USBDM

U3 FT232RL

USBDP

R68

Zdiff = 90Ω±15%

USB2.0 Differential Impedance

C55C54

C52

C51

USB-Serial C onverter

3. Microcontroller Peripheral Circuits

3.1 USB Serial Communication Circuit

Figure 3-1 shows the USB serial communication circuit on this board.

Figure 3-1 USB Serial Communication Circuit

The board has a USB serial communication conversion IC (U3: FT232RL). The FT232RL operating voltage

range is 4.0 to 5.25 V. To use USB serial communication, make the following settings.

• Apply 4.0 to 5.25 V to VCC.

• Connect pins 2 and 3 of JP17.

(For details on the JP17 circuit configuration, see “3.2 Emulator Peripheral Circuit”.)

R20UT4542EJ0110 Rev.1.10 Page 19 of 39 Mar.30.20

RSSKRX23E-A 3. Microcontroller Peripheral Circuits

Boot mode

Writes the FW using the SCI

Allows you to write the FW using

VCC

VSS

RESET(SW2)

CN7

RX23E-A

R78

R79

C60

VSS

R81

JP17

R82

R83

R84

C58

Emulator

USB

Programmer

Selector

VCC

3.2 Emulator Peripheral Circuit

Figure 3-2 shows the emulator peripheral circuit on the board. Table 3-1 lists the JP17 connections and

corresponding functions.

Figure 3-2 Emulator Peripheral Circuit

Table 3-1 JP17 Connections and Corresponding Functions

JP17

connection

Pins 1-2

Pins 2-3 Single-chip mode

Operating mode Function Remarks

(SCI interface)

interface.

Debugs and writes the FW using the emulator.

USB serial communication (CN6).

Applicable emulator: E1, E2, and E2 Lite

When using the emulator, connect it to CN7. Before supplying the power from the emulator, carefully

check that the power does not collide with the input power supply or LDO output.

By pressing the RESET button (SW2) MCU RES# pin can be reset.

The MCU operating mode can be selected from the boot mode (SCI interface) or single-chip mode by

changing the JP17 setting. During power on, never change the JP17 setting. The MCU may perform

unpredictable operation.

For details on the reset operation, and boot mode operation and functions, refer to “RX23E-A Group User's

Manual: Hardware”.

For details on how to use the emulator, refer to the user's manual of the emulator.

R20UT4542EJ0110 Rev.1.10 Page 20 of 39 Mar.30.20

RSSKRX23E-A 3. Microcontroller Peripheral Circuits

VCC

VSS

120Ω

R57

RX23E-A

CAN Transceiver

TXD

VCC

RXD

GN D

CAN_ L

CAN_ H

R77

OPEN

Ter mination

JP16

VSS

R43

R44

R42

C57

CAN_ H

VSS

CAN_ L

REF

VSS

C62

R94

RX23E-A

U4 ISL3159EF

RS-485 Driver

RE#

GN D

VSS

R40

R35

VSS

A/Y

B/Z

A/Y

VCC

R93

R92

VSS

B/Z

C61

VSS

R96　　 390Ω

R97

220Ω

VCC

VSS

R95　　 390Ω

3.3 RS-485 Communication Circuit

Figure 3-3 shows the RS-485 communication circuit on the board.

The RS-485 communication circuit on the board has a PROFIBUS DP-compliant, half-duplex communication

RS-485 driver ISL3159EFUZ. A 220-Ω termination resistor and a 390-Ω failsafe bias resistor are mounted on

R95, R96, and R97.

Figure 3-3 RS-485 Communication Circuit

3.4 CAN Communication Circuit

Figure 3-4 shows the CAN communication circuit on the board.

Figure 3-4 CAN Communication Circuit

The CAN communication circuit on the board has a CAN transceiver. The CAN bus can be connected directly

from J6. As a termination resistor, a 120-Ω resistor is connected between CAN-H and CAN-L. When the

termination resistor is required, connect pins 2 and 3 of JP16. When it is not required, connect pins 1 and 2 of

JP16.

R20UT4542EJ0110 Rev.1.10 Page 21 of 39 Mar.30.20

RSSKRX23E-A 3. Microcontroller Peripheral Circuits

VCC

LED1

Red

RX23E-A

R51

VSS

R56

LED2

Green

VSS

SW1

VCC

RX23E-A

R80

R85

C59

VSS

3.5 LED Circuit

Figure 3-5 shows the LED drive circuit on the board.

ON/OFF of LED1 (red) can be controlled by a port of MCU (PH2). LED2 (green) is a VCC power indicator.

Figure 3-5 LED Drive Circuit

3.6 Switch Input Circuit

Figure 3-6 shows the switch input circuit on the board.

For details on the RESET switch (SW2), see “3.2 Emulator Peripheral Circuit”.

Figure 3-6 Switch Input Circuit

R20UT4542EJ0110 Rev.1.10 Page 22 of 39 Mar.30.20

RSSKRX23E-A 3. Microcontroller Peripheral Circuits

VSS

RX23E

-A

C34

C33

3.7 External Clock Input Circuit

Figure 3-7 shows the external clock input circuit on the board.

The board has an 8-MHz external crystal oscillator as an external clock input source.

Figure 3-7 External Clock Input Circuit

R20UT4542EJ0110 Rev.1.10 Page 23 of 39 Mar.30.20

RSSKRX23E-A 4. Board Information

Applicable crimp

Terminal-applicable

4. Board Information

4.1 Using Terminal Blocks

Table 4-1 lists the part used for terminal blocks CN1, CN2, CN4, and CN5, recommended crimp terminal,

crimping tool, and terminal-applicable wire diameter.

Table 4-1 Terminal Blocks and Applicable Crimp Terminal

Part model name

FFKDS/H-2,54 (Note)

Note FFKDSA1/H-5,08 is used as each connector termination.

terminal

AI0.25-8 CRIMPFOX CENTRUS 10S and others AWG 24

Crimping tool

wire diameter

If you want to use an applicable crimp terminal, you can push in the crimp terminal to connect it to a connector

(push-in type). If a crimp terminal or crimping tool is unavailable, you can connect a stripped wire. To use a

stripped wire, follow the procedure below.

i) Push and hold the orange button into the board.

ii) Insert a stripped wire into the pin insertion hole.

iii) Release the orange button slowly.

iv) Lightly pull the wire to confirm that it is fixed.

To remove the crimp terminal and the wire, follow the procedure below.

i) Push and hold the orange button into the board.

ii) Remove the crimp terminal and the wire from the pin insertion hole.

iii) Release the orange button slowly.

R20UT4542EJ0110 Rev.1.10 Page 24 of 39 Mar.30.20

RSSKRX23E-A 4. Board Information

Power Output

Terminal block for outputting an analog power supply.

Signal Input

Terminal block for inputting an analog power supply.

USB Serial

Connector for USB serial communication.

Connector for connecting an emulator.

4.2 Connectors

Table 4-2 lists the connectors on the board.

Table 4-2 Connectors

Reference Connector Name Explanation

CN1

CN2

CN3

CN4

CN5

CN6

CN7 Emulator Connector

Terminal Block

Thermocouple Connector

System Power Input Terminal Block

Analog power Input Terminal Block

Communication Connector

Use this connector as an excitation voltage source for a strain gage, etc.

Terminal block for inputting analog signals

Miniature thermocouple input socket. Copper is used for the material of both terminals. The terminal screws are soldered to the board. Do NOT rotate them.

Terminal block for inputting a system power supply

Use this connector to supply an analog power supply separately from the system power supply.

The connector type is USB mini-B. Use this connector for communication with PC Tool Program.

Use the 14-pin interface cable supplied with the emulator. The applicable emulator is E1, E2, and E2 Lite.

R20UT4542EJ0110 Rev.1.10 Page 25 of 39 Mar.30.20

RSSKRX23E-A 4. Board Information

Silk

GND output

Analog GND output for an external device.

Positive reference voltage input pin.

AIN1

I/O

Analog signal input pin

AIN3

I/O

Analog signal input pin

Analog signal input pin and positive reference voltage input pin.

Analog signal input pin.

Analog signal input pin and excitation current output pin.

Table 4-3 to

Table 4-9 detail each connector.

Table 4-3 CN1: Power Output Terminal Block

printing

Function I/O Explanation

Power supply

output

(AVCC0)

(AVSS0)

Analog power supply output for an external device. Connected to AVCC0. When using the LDO, carefully observe the current limitation.

Connected to AVSS0.

Table 4-4 CN2: Signal Input Terminal Block

Silk

printing

LSW LSW O LSW output pin

R0N REF0N I/O

R0P REF0P I/O

0 AIN0 I/O Analog signal input pin

2 AIN2 I/O Analog signal input pin

4 AIN4/REF1N I/O Analog signal input pin and negative reference voltage input pin

Connected

MCU pin

I/O Explanation

Negative reference voltage input pin. Can be connected to the LSW or AVSS0 by changing the JP7 setting.

Can be connected to AVCC0 by changing the JP8 setting.

5 AIN5/REF1P I/O

6 AIN6 I/O

7 AIN7 I/O

8 AIN8/IEXC1 I/O

9 AIN9/IEXC0 I/O

Note The AIN0 to AIN9 pins can be connected to excitation current sources IEXC0 to IEXC3 and used as excitation

current output pins by setting MCU registers.

Can be connected to RTD1 by changing the JP9 setting.

Analog signal input pin. Can be connected to RTD1 by changing the JP10 setting. Can be connected to AIN8/IEXC1 by changing the JP11 setting.

Can be connected to RTD1 by changing the JP10 setting. Can be connected to AIN9/IEXC0 by changing the JP11 setting.

Analog signal input pin and excitation current output pin. Can be connected to AIN6 by changing the JP11 setting.

Can be connected to AIN7 by changing the JP11 setting. Can be connected to RTD1 by changing the JP12 setting.

R20UT4542EJ0110 Rev.1.10 Page 26 of 39 Mar.30.20

RSSKRX23E-A 4. Board Information

Silk

Connected

AIN11

I/O

Analog signal input pin

Silk

GND input

Silk

GND input

Pin No.

Function

I/O

Explanation

USBDM

I/O

USB data line D-

Table 4-5 CN3: Thermocouple Connector

printing

AIN10 AIN10 I/O

Note The AIN10 and AIN11 pins can be connected to excitation current sources IEXC0 to IEXC3 and used as excitation

current output pins by setting MCU registers.

MCU pin

I/O Explanation

Analog signal input pin

Table 4-6 CN4: System Power Input Terminal Block

printing

Function I/O Explanation

Power supply

input (Vd)

(VSS)

I GND input. Connected to VSS.

System power supply input. Connected to Vd. Vd can be connected to VCC by changing the JP14 setting.

Table 4-7 CN5: Analog power Input Terminal Block

printing

Function I/O Explanation

Power supply

input (Va)

System power supply input. Connected to Va. Va can be connected to AVCC0 by changing the JP15 setting.

(AVSS0)

I GND input. Connected to AVSS0.

Table 4-8 CN6: USB Serial Communication Connector

1 Vbus I

3 USBDP I/O USB data line D+

5 GND I GND for an external USB power supply. Connected to VSS.

(Not used)

- -

USB power supply pin. Connected to Vbus. Vbus can be connected to VCC by changing the JP14 setting.

R20UT4542EJ0110 Rev.1.10 Page 27 of 39 Mar.30.20

RSSKRX23E-A 4. Board Information

Pin No.

Function

I/O

Explanation

VSS

VSS pin

(Not used)

VCC

VCC pin

(Not used)

VSS

VSS pin

VSS

VSS pin

Table 4-9 CN7: Emulator Connector

1 (Not used) - -

3 (Not used) - -

5 (Not used) - -

MD/FINED pin.

7 MD/FINED I/O

9 (Not used) - -

11 (Not used) - -

JP7 can be used to switch between the single-chip mode (pull-up) and SCI interface boot mode (pull-down).

13 RES# I RES# pin

R20UT4542EJ0110 Rev.1.10 Page 28 of 39 Mar.30.20

RSSKRX23E-A 4. Board Information

Pin header for UART communication (not mounted).

Pin header for CAN communication.

Pin No.

Function

I/O

Explanation

VCCOUT

Power output pin. Connected to VCC.

Pin No.

Function

I/O

Explanation

CAN_H pin.

VSS

Signal GND connection pin. Connected to VSS.

CAN_L pin.

Pin No.

Function

I/O

Explanation

VSS

Signal GND connection pin. Connected to VSS.

RS-485 driver non-inverting I/O pin.

4.3 Pin Headers for Communication Interfaces

Table 4-10 lists the pin headers for communication interfaces on the board.

Table 4-10 Pin Headers for Communication Interfaces

Reference Function Explanation

UART communication

CAN communication

RS-485 communication

To use this pin header, remove R64 and R66 and mount R62 and R63. Connected to TXD1 and RXD1 of the MCU.

A CAN transceiver (U5) is mounted. A 120-Ω termination resistor is mounted between CAN_H and CAN_L. Can select whether to use of the termination resistor by using JP16

Pin header for RS-485 communication. An RS-485 driver ISL3159EFUZ (U4) is mounted. A 220-Ω termination resistor and a 390-Ω failsafe bias resistor are mounted.

Table 4-11 to Table 4-13 detail each communication interface pin header.

Table 4-11 J5: Pin Header for UART Communication (Not Mounted)

RXD input pin.

2 RXIN I

3 TXOUT O

4 VSS O Signal GND connection pin. Connected to VSS.

To use this pin, remove R64 and mount R63. Connected to RXD1 of the MCU.

TXD output pin. To use this pin, remove R66 and mount R62. Connected to TXD1 of the MCU.

Table 4-12 J6: Pin Header for CAN Communication

1 CAN_H I/O

3 CAN_L I/O

Connected to termination resistor R77 by changing the JP16 setting.

Table 4-13 J7: Pin Header for RS-485 Communication

2 B/Z I/O

3 A/Y I/O

RS-485 driver inverting I/O pin. Connected to the B/Z pin of the driver.

Connected to the A/Y pin of the driver.

R20UT4542EJ0110 Rev.1.10 Page 29 of 39 Mar.30.20

RSSKRX23E-A 4. Board Information

Switches the circuit connected to AIN5 to AIN9.

Selecting whether to use the CAN

Can select whether to use the termination resistor

Pins 1-2

Select this setting to input an external reference from CN2 to REF0N.

Pins 5-6

REF0N-AVSS0

Connects AVSS0 to REF0N.

4.4 Jumper Pins

Table 4-14 lists the jumper pins on the board.

During power on, do NOT change the setting of any jumper pin. A failure, deterioration, and/or

unpredictable operation may occur.

Table 4-14 Jumper Pins

Reference Function Explanation

JP1 to JP6 Short-circuiting analog inputs Used to short-circuit analog inputs.

JP7 and JP8 Selecting a reference input Used to select REF0N or REF0P input.

JP9 to JP12

JP13 Connecting AIN5/REF1P and AIN6 Can connect AIN5/REF1P and AIN6.

JP14 and JP15 Selecting a power supply

JP16

JP17 Selecting the MCU operating mode

Switching the RTD measurement circuit

termination resistor

Can select the circuit configuration from external input, onboard RTD measurement, four-wire RTD, or three-wire RTD measurement.

JP14: Selects Vd, VLDO, or Vbus as VCC. JP15: Selects Va or VCC as AVCC0.

between CAN_H and CAN_L.

Can select the single-chip mode or boot mode as the MCU operating mode.

Table 4-15 to Table 4-26 detail each jumper pin.

Table 4-15 JP1 to JP6: Jumper Pins for Short-circuiting Analog Channels

Reference Function Explanation

JP1 Short-circuiting AIN0 and AIN1 Jumper pins for connecting AIN0 and AIN1 (not mounted)

JP2 Short-circuiting AIN2 and AIN3 Jumper pins for connecting AIN2 and AIN3

JP3 Short-circuiting AIN4 and AIN5 Jumper pins for connecting AIN4 and AIN5 (not mounted)

JP4 Short-circuiting AIN6 and AIN7 Jumper pins for connecting AIN6 and AIN7 (not mounted)

JP5 Short-circuiting AIN8 and AIN9 Jumper pins for connecting AIN8 and AIN9

JP6 Short-circuiting AIN10 and AIN11 Jumper pins for connecting AIN10 and AIN11 (not mounted)

Table 4-16 JP7: Jumper Pins for Selecting REF0N Input

JP7

connection

Pins 3-4 REF0N-LSW Connects LSW to REF0N.

Signal name Explanation

R20UT4542EJ0110 Rev.1.10 Page 30 of 39 Mar.30.20

RSSKRX23E-A 4. Board Information

JP8

Pins 3-4

Not used.

Pins 1-2

Select this setting to input signals from CN2 to AIN5/REF1P.

Pins 1-2

Select this setting to input signals from CN2 to AIN9.

Table 4-17 JP8: Jumper Pins for Selecting REF0P Input

connection

Pins 1-2 - Select this setting to input an external reference from CN2 to REF0P.

Pins 5-6 AVCC0-REF0P Connects AVCC0 to REF0P.

Signal name Explanation

Table 4-18 JP9: Jumper Pins for Connecting AIN5/REF1P to the On-Board RTD

JP9

connection

Pins 2-3 RTD1-REF1P

Signal name Explanation

Connects RTD1 to REF1P. Select this setting to use the on-board RTD.

Table 4-19 JP10: Jumper Pins for Connecting AIN6 and AIN7 to the On-Board RTD

JP10

connection

and

Pins 3-4

Pins 5-6

and

Pins 7-8

Signal name Explanation

- Select this setting to input signals from CN2 to AIN6 and AIN7.

RTD1-AIN6 AIN7-RTD1

Connects AIN6 and AIN7 to both ends of RTD1. Select this setting to use the on-board RTD.

Table 4-20 JP11: Jumper Pins for Connecting AIN8 and AIN9 to the Three-Wire RTD

JP11

connection

and

Pins 3-4

Pins 5-6

and

Pins 3-4

Signal name Explanation

- Select this setting to input signals from CN2 to AIN6, AIN7, AIN8, and AIN9.

AIN9-AIN7 AIN8-AIN6

Connects AIN6 and AIN8, and AIN7 and AIN9. Select this setting to connect the three-wire RTD to CN2.

Table 4-21 JP12: Jumper Pins for Connecting AIN9 to the On-Board RTD

JP12

connection

Pins 3-4 RTD1-AIN9

Signal name Explanation

Connects RTD1 to AIN9. Select this setting to use the on-board RTD.

R20UT4542EJ0110 Rev.1.10 Page 31 of 39 Mar.30.20

RSSKRX23E-A 4. Board Information

JP13

Connects VLDO to VCC.

JP15

Connects Va to AVCC0.

JP16

Pins 1-2

Disables the termination resistor.

Sets the MCU operating mode to the boot mode (SCI interface).

Table 4-22 JP13: Jumper Pins for Connecting AIN5/REF1P and AIN6

connection

Pins 1-2 AIN5/REF1P-AIN6 Connects AIN5/REF1P and AIN6 (not mounted).

Signal name Explanation

Table 4-23 JP14: Jumper Pins for Selecting a System Power Supply

JP14

connection

Pins 1-2 VCC-Vd

Pins 3-4 VCC-VLDO

Pins 5-6 VCC-Vbus

Signal name Explanation

Connects Vd to VCC. Select this setting to operate the board with the power supplied from CN4.

Select this setting to operate the board with the LDO output.

Connects Vbus to VCC. Select this setting to operate the board with the USB power supply.

Table 4-24 JP15: Jumper Pins for Selecting an Analog Power Supply

connection

Pins 1-2 Va-AVCC0

Pins 2-3 AVCC0-VCC

Signal name Explanation

Select this setting to operate the analog side of the MCU with the power supplied from CN5. When using this setting, supply power to VCC in advance.

Connects VCC to AVCC0. Select this setting to use the common power supply for AVCC0 and VCC.

Table 4-25 JP16: Jumper Pins for Selecting Whether to Use the CAN Bus Termination Resistor

connection

Pins 2-3

Signal name Explanation

Enables the termination resistor.

Table 4-26 JP17: Jumper Pins for Selecting the MCU Operating Mode

JP17

connection

Pins 1-2 MD/FINED pull-down

Pins 2-3 MD/FINED pull-up

Function Explanation

In the boot mode, the FW written at shipment does not operate. You can write the FW with USB serial communication (CN6).

Sets the MCU operating mode to the single-chip mode. Use this setting to operate the FW written at shipment. You can debug and write the FW using the emulator (CN7).

R20UT4542EJ0110 Rev.1.10 Page 32 of 39 Mar.30.20

RSSKRX23E-A 4. Board Information

Communication interface connection through-holes.

Pin No.

Function

I/O

Explanation

VSS

4.5 Universal Through-Holes

Table 4-27 lists the universal through-holes on the board.

All pins in the digital side of the MCU are connected to universal through-holes. The function of a pin

connected to a universal through-hole can be changed with a user program. For the initial setting of each pin,

see “4.9 Initial Settings of MCU Pins”.

For details of available functions and how to change the function, refer to “RX23E-A User's Manual:

Hardware”.

Table 4-27 Universal Through-Holes

Reference Function Explanation

J1 Power through-holes Power input through-holes. Can be connected to Vd and VSS.

J2 PWM output through-holes

J4 SCI1 interface through-holes SCI1 interface connection through-holes

Communication interface through-holes

PWM output through-holes. Can be connected to MTIOC3x of the MCU.

Can be connected to the SCI5 interface, CAN module, SPI interface, and others.

Table 4-28 to Table 4-31 detail each universal through-hole. If inputting voltage to pin whose MCU pin

number is described in the table, set the pin to input and keep in range described in the table “Table

2-1 Recommended Operating Conditions”. Failure to observe the conditions may cause failure or

damage to the MCU.

Table 4-28 J1: Power Through-Holes

2 VSS I

VSS pins

Vd pins

R20UT4542EJ0110 Rev.1.10 Page 33 of 39 Mar.30.20

RSSKRX23E-A 4. Board Information

MCU

2 －

VCC

VCC pin. Used for supplying power to an external device.

4 －

VCC

VCC pin. Used for supplying power to an external device.

PB1

I/O

PB1 pin. Pulled up to VCC with R27.

8 －

VSS

VSS pin

PC5/MTIOC3B

I/O

PC5/MTIOC3B pin

PC7/MTIOC3A

I/O

PC7/MTIOC3A pin

MCU

2 －

VCC

VCC pin. Used for supplying power to an external device.

PH0/RXD5 pin. Connected to U4.

PH2 pin. Connected to LED1.

P14/SS1#/CTXD0 pin. Connected to U5.

P16/SMOSI1/SCL

I/O

P16/SMOSI1/SCL pin

Table 4-29 J2: PWM Output Through-Holes

No.

11 26 PC6/MTIOC3C I/O PC6/MTIOC3C pin

Pin No.

1 － VSS O VSS pin

3 － VSS O VSS pin

5 31 PB0 I/O PB0 pin. Pulled up to VCC with R26.

7 － VSS O VSS pin

9 28 PC4/MTIOC3D I/O

Function I/O Explanation

PC4/MTIOC3D/RTS5# pin. Connected to U4. To use the through-hole, remove R89.

Table 4-30 J3: Communication Interface Through-Holes

No.

Pin No.

1 － VSS O VSS pin

Function I/O Explanation

3 23 PH1/TXD5 I/O

4 24 PH0/RXD5 I/O

5 21 PH3/CANMODE I/O

6 22 PH2 I/O

7 19 P15/SMISO1/CRXD0 I/O

8 20 P14/SS1#/CTXD0 I/O

9 17 P17/SCK1/SDA I/O P17/SCK1/SDA pin

PH1/TXD5 pin. Connected to U4. To use the through-hole, remove R90.

To use the through-hole, remove R91.

PH3/CANMODE pin. Pulled up to VCC with R28.

To use the through-hole, remove R51.

P15/SMISO1/CRXD0 pin. Connected to U5. To use the through-hole, remove R59.

To use the through-hole, remove R58.

R20UT4542EJ0110 Rev.1.10 Page 34 of 39 Mar.30.20

RSSKRX23E-A 4. Board Information

MCU

P26/TXD1 pin. Pulled up to VCC with R69.

P30/RXD1 pin.

P31/CTS1# pin. MD/FINED pin.

RES# pin. Pulled up with R78.

Table 4-31 J4: SCI1 Interface Through-Holes

No.

Pin No.

1 15 P27/IRQ3/SW1 I/O

2 16 P26/TXD1 I/O

3 － VSS O VSS pin

4 14 P30/RXD1 I/O

5 12 P35/NMI I P35/NMI pin. Pulled up to VCC with R29.

6 13 P31/CTS1# I/O

7 8 P36/EXTAL I/O

8 11 MD/FINED I/O

9 6 P37/XTAL I/O

Function I/O Explanation

P27/IRQ3/SW1 pin. Connected to SW1 via R85. Pulled up to VCC with R80.

To use the through-hole, remove R66. When R66 is removed, the pull-up with R69 is disabled.

Pulled up to VCC with R60. To use the through-hole, remove R64.

Pulled up to VCC with R61. To use the through-hole, remove R65.

P36 pin. Unconnected at shipment. To use the through-hole, remove R22 and R23 and mount R21. When R22 or R23 is removed, the external crystal oscillator (Y1) cannot be used.

The pull-up or pull-down can be selected with JP17.

P37 pin. Unconnected at shipment. To use the through-hole, remove R22 and R23 and mount R24. When R22 or R23 is removed, the external crystal oscillator (Y1) cannot be used.

10 5 RES# I

Connected to SW2 via R84.

R20UT4542EJ0110 Rev.1.10 Page 35 of 39 Mar.30.20

RSSKRX23E-A 4. Board Information

Reference

Signal name

Explanation

TH2 to TH5

VSS

Pads for mounting TH-1.6-x-M2 (Mac-Eight)

Reference

Signal name

Explanation

TP2

AVCC0

Connected to AVCC0.

TP4

VSS

Connected to VSS.

TP6

Connected to Vd.

TP8

Connected to Va.

4.6 Through-Hole Taps

Table 4-32 lists the through-hole taps on the board.

Table 4-32 Through-Hole Taps

TH1 AVSS0 Shielded wire can be connected to AVSS0 with an M3 screw.

4.7 Test Points

Table 4-33 lists the test points on the board.

TP1 and TP4 have a check pin.

Table 4-33 Test Points

TP1 AVSS0 Connected to AVSS0.

TP3 REFOUT Connected to REFOUT.

TP5 VCC Connected to VCC.

TP7 VLDO Connected to VLDO.

TP9 Vbus Connected to Vbus.

R20UT4542EJ0110 Rev.1.10 Page 36 of 39 Mar.30.20

RSSKRX23E-A 4. Board Information

Reference

Signal

Initial state

Explanation

SO2

AIN0

Unconnected

Can connect AIN0 to AVSS0.

SO4

AIN2

Unconnected

Can connect AIN2 to AVSS0.

SO6

AIN4

Unconnected

Can connect AIN4 to AVSS0.

SO8

AIN6

Unconnected

Can connect AIN6 to AVSS0.

SO10

AIN8

Unconnected

Can connect AIN8 to AVSS0.

SO12

AIN10

Unconnected

Can connect AIN10 to AVSS0.

VSS-

4.8 Short Pads

Table 4-34 lists the short pads on the board.

SO1 to SO13 are factory-set to the unconnected state. You can handle these unused pins simply by short-

circuiting them with soldering.

SS1 is factory-set to the connected state. You can disconnect the connection by cutting the pattern.

Table 4-34 Short Pads

name

SO1 LSW Unconnected Can connect LSW to AVSS0.

SO3 AIN1 Unconnected Can connect AIN1 to AVSS0.

SO5 AIN3 Unconnected Can connect AIN3 to AVSS0.

SO7 AIN5 Unconnected Can connect AIN5 to AVSS0.

SO9 AIN7 Unconnected Can connect AIN7 to AVSS0.

SO11 AIN9 Unconnected Can connect AIN9 to AVSS0.

SO13 AIN11 Unconnected Can connect AIN11 to AVSS0.

SS1

AVSS0

Connected Connects VSS and AVSS0.

R20UT4542EJ0110 Rev.1.10 Page 37 of 39 Mar.30.20

RSSKRX23E-A 4. Board Information

MCU

MCU pin name

Connected destination

J4 and SW1,

4.9 Initial Settings of MCU Pins

Table 4-35 and Table 4-36 list the initial settings of MCU pins.

The AIN6 to AIN11 pins can be used as AN000 to AN005 which are pins for a 12-bit successive

approximation A/D converter (S12ADE) and VREFH0 and VREFL0 which are reference voltage input pins.

For details, refer to “RX23E-A User's Manual: Hardware”.

Table 4-35 Initial Settings of MCU Pins (1/2)

pin No.

1 AIN10 AIN10 - CN3

2 AIN11 AIN11 - CN3

3 AVSS0-1 AVSS0 - AVSS0

4 AVCC0-1 AVCC0 - AVCC0

5 RES# RES# - J4 and SW2

6 P37/XTAL XTAL - Y1

7 VSS-1 VSS - VSS

8 P36/EXTAL EXTAL - Y1

9 VCC-1 VCC - VCC

10 VCL VCL - VCC

11 MD/FINED MD/FINED - CN7

12 P35 NMI Input J4, pull-up (VCC)

13 P31/CTS1# CTS#1 - J4 and U3, pull-up (VCC)

14 P30/RXD1 RXD1 - J4 and U3, pull-up (VCC)

in the circuit diagram

Pin function I/O setting

on the board

15 P27/IRQ3 P27 Input

16 P26/TXD1 TXD1 - J4 and U3

17 P17/SCK1/SDA P17 Input J3

18 P16/SMOSI1/SCL P16 Input J3

19 P15/SMISO1/CRXD0 P15 Input J3 and U5

20 P14/SS1#/CTXD0 P14 Input J3 and U5

21 PH3 PH3 Input J3, pull-up (VCC)

22 PH2 PH2 Output J3, LED1

23 PH1/TXD5 PH1 Input J3 and U4

24 PH0/RXD5 PH0 Input J3 and U4

25 PC7/MTIOC3A PC7 Input J2

26 PC6/MTIOC3C PC6 Input J2

27 PC5/MTIOC3B PC5 Input J2

28 PC4/MTIOC3D PC4 Input J2 and U4, pull-down (VSS)

pull-up (VCC)

R20UT4542EJ0110 Rev.1.10 Page 38 of 39 Mar.30.20

RSSKRX23E-A 4. Board Information

MCU

MCU pin name

Connected destination

Table 4-36 Initial Settings of MCU Pins (2/2)

pin No.

29 PB1 PB1 Input J2, pull-up (VCC)

30 VCC-2 VCC - VCC

31 PB0 PB0 Input J2, pull-up (VCC)

32 VSS-2 VSS - VSS

33 AVCC0-2 AVCC0 - AVCC0

34 AVSS0-2 AVSS0 - AVSS0

35 REFOUT REFOUT - REFOUT

36 LSW LSW (Note) - CN2

37 REF0N REF0N - CN2

38 REF0P REF0P - CN2

39 AIN0 AIN0 - CN2

40 AIN1 AIN1 - CN2

41 AIN2 AIN2 - CN2

42 AIN3 AIN3 - CN2

in the circuit diagram

Pin function I/O setting

on the board

43 AIN4/REF1N AIN4 - CN2

44 AIN5/REF1P AIN5 - CN2

45 AIN6 AIN6 - CN2

46 AIN7 AIN7 - CN2

47 AIN8/IEXC1 AIN8 - CN2

48 AIN9/IEXC0 AIN9 - CN2

Note LSW is set to the switch OFF state in the FW at shipment.

R20UT4542EJ0110 Rev.1.10 Page 39 of 39 Mar.30.20

Appendix

Appendix 1. Board Diagrams

Silkscreen on the Component (Top) Side

Silkscreen on the Soldering (Bottom) Side (Viewed from the Soldering Side)

Layer 1: Top Side Layer

Layer 2: Ground Plane

Layer 3: Power and Ground Plane

Layer 4: Bottom Side Layer (Viewed from the Component Side)

iii

Appendix 2. Circuit Diagram

SO1

REF0N-IN

LSW

246

JP7

135

AVSS0LSWEXT

R5 NM(390)

R6 0

LSW

2W EXT-RTD

RTD1EXT

0.01uF 50V C21

C10

C11

C12

C13

C14

C15

C16

C17

C18

C19

C20

0.1uF 50V

0.01uF 50V

C22

0.1uF 50V

0.01uF 50V

NM(0.01uF)

C23

NM(0.1uF)

NM(0.01uF)

0.01uF 50V

C24

0.1uF 50V

0.01uF 50V

C25

0.1uF 50V

0.01uF 50V

NM(0.01uF)

C26

NM(0.1uF)

NM(0.01uF)

0.01uF 50V

C27

0.1uF 50V

0.01uF 50V

REF0N REF0P

AIN0 AIN1

AIN2 AIN3

AIN4/REF1N AIN5/REF1P

AIN6 AIN7

AIN8/IEXC1 AIN9/IEXC0

AIN10 AIN11

VCCAVCC0

PB0

VSS-2

RX23E-A

4.7uF 50V

0.1uF 50V

PB1

VCC-2

PC5/MTIOC3B

PC4/MTIOC3D

P15/SMISO1/CRXD0

C35

C36

PB0R PB1R MTIOC3D MTIOC3B MTIOC3C MTIOC3A

PC7/MTIOC3A

PC6/MTIOC3C

PH0/RXD5

PH1/TXD5

P14/SS1#/CTXD0 P16/SMOSI1/SCL

P17/SCK1/SDA

P26/TXD1

P27/IRQ3

P30/RXD1

P31/CTS1#

R33 33 R34 33 R35 33 R36 33 R37 33 R38 33

24 23 22

PH2

PH3

20 19 18 17 16 15 14 13

R51 3k

RXD5R TXD5R PH2R PH3R SS#/CTXDR SMISO/CRXDR SMOSI/SCLR SCK/SDAR TXD1R IRQ3R

RXD1R

CTS1#R

R39 33 R40 33 R41 33 R42 33 R43 33 R44 33 R45 33 R46 33

R47 33 R48 0 R49 0 R50 0

PH2

LED1

LED Red

PB0 PB1 PC4/MTIOC3D PC5/MTIOC3B PC6/MTIOC3C PC7/MTIOC3A

VCC

PH0/RXD5 PH1/TXD5 PH2

PH3/CANMODE P14/SS1#/CTXD0

P15/SMISO1/CRXD0 P16/SMOSI1/SCL P17/SCK1/SDA

P26/TXD1

P27/IRQ3/SW1 P30/RXD1 P31/CTS1#

LSW

REF0N REF0P

AIN0

AIN1 AIN2

AIN3

AIN4/REF1N AIN5/REF1P

AIN6 AIN7

AIN8/IEXC1 AIN9/IEXC0

REFOUT

TP3

REFOUT

37 38 39 40 41 42 43 44 45 46 47 48

0.1uF 50V

C30

0.47uF 25V

REF0N REF0P AIN0 AIN1 AIN2 AIN3 AIN4/REF1N AIN5/REF1P AIN6 AIN7 AIN8/IEXC1 AIN9/IEXC0

C31

4.7uF 50V C32

LSW

AVSS0-234REFOUT

AVCC0-2

AIN101AIN112AVSS0-13AVCC0-14RES#5P37/XTAL6VSS-17P36/EXTAL8VCC-19VCL10MD/FINED11P35

AIN10 AIN11

C28

0.1uF 50V

4.7uF 50V

AVCC0AVSS0 VSS VCC

TP1

TP2

AVCC0 VCC

AVCC0

C29

VCC VCC VCC

R26 10k

PB0

R30 NM(10k)

R21 NM(0)

C33

XTAL_R

EXTAL_R

R22 0

R25 NM(0)

XTAL

8MHz 100ppm

8pF 50V

R27 10k

R31 NM(10k)

VCC

C37

4.7uF 50V C38

0.1uF 50V C39

4.7uF 50V

VCC

R29 10k

VCL

R24 NM(0)

R23 0

EXTAL

C34

8pF 50V

R28 10k

R32 NM(10k)

P35/NMI

MD/FINED

P36

P37

RES#

P35/NMIPH3/CANMODEPB1

TP4

Title

RSSKRX23E-A Board

Size Document Number Rev

Date: Sheet of

TP5

1 2Friday, October 25, 2019

1.00

D D

AVCC0-OUT

CN1

Terminal Block 2

AVSS0

TH1

M3 Terminal

Analog Input

CN2

LSW

R0N R0P

C C

Terminal Block 13

B B

A A

Thermocouple Connector

0 1 2 3 4 5 6 7 8 9

RTD1 Pt100

CN3

AIN10 AIN11

AVCC0

246

135

123

246

135

246

135

123

RTD1EXT

JP8

AVCC0

R3 NM(5.1k)

JP11

3W EXT-RTD

R7 0

- AVCC0EXT

R8 1k

R9 1k

R10 0

R11 0 R12 390

R13 1k

5.1k 0.1%

R14 1k

JP13

1 2

R15 1k

R16 1k

R17 0

R18 0

R19 1k

R20 1k

RTD1-L RTD1-H

4.7uF 50V

0.1uF 50V

REF0P/IN

REF0P-IN

R86 NM(0)

AIN0-IN

SO2

SO3

AIN1-IN

AIN2-IN

SO4

SO5

AIN3-IN

AIN4-IN

AIN4/REF1N

SO6

SO7

AIN5/REF1P

AIN5-IN

R87 NM(0)

R88 0

AIN6-IN

SO8

SO9

AIN7-IN

AIN8-IN/IEXC1OUT

SO10

SO11

AIN9-IN/IEXC0OUT

AIN10-IN

SO12

SO13

AIN11-IN

JP1

JP2

JP3

JP4

JP5

JP6

AIN0

1 2

AIN1

AIN2

1 2

AIN6

1 2

AIN7

AIN8

1 2

AIN9

AIN10

1 2

AIN11

R1 0

JP9

JP10

R2 0

JP12

EXT RTD1

Power Input

VCC VCC

Vd System Power

CN4

D D

Terminal Block 2

C42

C43

4.7uF 50V

TP6

RB060LAM-40

1 2 3

0.1uF 50V

C41

C40

0.1uF 50V

RB551VM-30

U2 ISL80410

IN NC NC-1 EN

R52 0

OUT

ADJ

NC-2

GND PAD

VLDOin

P30/RXD1

P31/CTS1#

47uF 35V

TP7

8 7 6 5 9

VLDO

C45

C44

ADJ

10uF 50V

0.1uF 50V

VLDO VbusVd

VdVLDOin

Vbus

246

JP14

R53 68k

135

VCC

R55 200k

R54 22k

P26/TXD1

R61 10k

R60 10k

R64 33 R65 33 R66 0

R63 NM(0)

R62 NM(0)

R69 10k

FT_RTS#OUT

C51

R67 NM(0)

R68 0

FT_TXOUT

0.1uF 50V

TXD DTR# RTS# VCCIO RXD RI# GND NC DSR# DCD# CTS# CBUS4 CBUS2 CBUS3

FT232RLU3

OSCO

OSCI TEST

AGND

CBUS0 CBUS1

GND2

VCC

RESET#

GND1

3V3OUT

USBDM USBDP

1 2 3 4 5 6 7 8

9 10 11 12 13 14

R70 0

28 27 26 25 24 23 22 21 20 19 18 17 16 15

Vbus

TP9

Vbus

3.3VOUT

C53

C52

0.1uF 50V

BEAD FERRITE

USBDPCTS#-IN USBDM

C54

0.1uF 50V

4.7uF 50V

D4 RCLAMP0502BA

Vbus_IN

C55

VCC

C56

CN6

FG4

FG3

FG2

FG1

GND

USBDP

USBDM

VBUS

USB mini-B

0.1uF 50V

UART

VCCOUT

RXIN TXOUT

0.1uF 50V

RXIN

TXOUT

VSS

TP8

Va Analog Power

CN5

C C

Terminal Block 2

C46

0.1uF 50V

RB060LAM-40

C47

47uF 35V

AVCC0 VCC

123

JP15

VCC

C48

0.1uF 50V

VCC

R92 NM(10k)

R94 33

R93 10k

VCC

R96 390

ISL3159EF

RO RE# DE DI

VCC

GND

B/Z A/Y

2 3 4

R98 0

8 7 6 5

C61

VCC

R97 220

0.1uF 50V

VCC

R95 390

D5 SM712

RS-485

OFIBUS DP

VSS

B/Z

A/Y

SS1

AVSS0 - VSS

R56 3.9k

POWER

LED2 LED Green

RXD5/RO

PC4/DE

TXD5/DI

0.1uF 50V

U5 MAX13053

TXD

GND

VCC RXD4REF

CAN_H

CAN_L

MD/FINED

RES#

P27/IRQ3/SW1

8 7 6 5

C62

0.1uF

R74 0

VCC

Programmer

Selector

R78 4.7k

R79 4.7k

R81 4.7k

VCC

R80 4.7k

C59

1000pF 50V

R77 120

JP17

1 2 3

C58

JP16

OPEN

2 3

Termination

USB

Emulator

R82 33

R83 33

R84 100

1000pF 50V

R85 100

E2 Lite

CN7

1 3 5 7

9 11 13

7614-5002PL

FSM1LPAS

R75 NM(0)

R73 NM(0)

CAN-H CAN-L

RESET

1 4

SW2

2 3

SW1

1 4

SW1

2 3

CAN

CAN_H

VSS

CAN_L

2 4

VCC

6 8 10 12 14

C60

0.1uF 50V

Title

RSSKRX23E-A Board

Size Document Number Rev

Date: Sheet of

2 2Friday, October 25, 2019

1.00

Digital Output

R72 NM(10k)

PWM Output

0.1uF 50V

B B

TH2

NM(TH-1.6-M2)

PB0 PB1

PC4/MTIOC3D

PC6/MTIOC3C PC7/MTIOC3A

Communication I/F

0.1uF 50V

PH1/TXD5 PH0/RXD5

PH3/CANMODE PH2

P15/SMISO1/CRXD0

P17/SCK1/SDA

A A

TH3

NM(TH-1.6-M2)

P27/IRQ3/SW1

P35/NMI

P36 P37

SCI1 I/F

VCC

C49

PC5/MTIOC3B

TH4

NM(TH-1.6-M2)

R89 0 R90 0 R57 NM(0)

VCC

C50

1 3 5 7 9

R91 0

2 4 6 8 10

P14/SS1#/CTXD0 P16/SMOSI1/SCL

R58 0 R59 0

P26/TXD1 P30/RXD1 P31/CTS1# MD/FINED RES#

PC4/DE TXD5/DI

CANMODE

RXD5/RO

CTXD0 CRXD0

TH5

NM(TH-1.6-M2)

CTXD0

CRXD0

CANMODE

R71 NM(10k)

R99 0

C57

No.

Quantity

(Mounted)

Reference Designator

(Mounted)

Reference Designator

(Not Mounted)

Description Part Name Manufacturer Part Name※ Maker Name

1 3 CN1,CN4,CN5 Terminal block Connector

FFKDSA1/H-2,54-2 Phoenix contact

2 1 CN2 Terminal block Connector

FFKDSA1/H-2,54-13 Phoenix contact

3 1 CN3 Thermocouple connector Connector FMTC-CU-PCB LABFACILITY 4 1 CN6 USB-miniB Connector UB-M5BR-G14-4S JST 5 1 CN7 14-pin connector Connector 7614-5002PL 3M 6 26 C1,C21,C22,C24,C25,C27, C23,C26 0.1uF, 50V Ceramic capacitor CGA2B3X7R1H104K050BB TDK

C28,C32,C36,C38,C40,C43,

C44,C46,C48,C49,C50,C51,

C52,C53,C55,C56,C57,C60,

C61,C62

7 8

C2,C29,C31,C35,C37, 4.7uF, 50V Ceramic capacitor GRM21BC71H475KE11 murata

C39,C42,C54

8 10

C7,C8,C9,C10,C13,C14, C11,C12,C17,C18 0.01uF, 50V Ceramic capacitor GRM1885C1H103JA01 murata

C15,C16,C19,C20

9 1

C30 0.47uF, 25V Ceramic capacitor TMK107B7474KA Taiyo Yuden

10 2

C33,C34 8pF, 50V Ceramic capacitor GCM1555C1H8R0DA16 murata

11 2

C41,C47 47uF, 35V Electrolytic capacitor EEE-HDV470XAP Panasonic

12 1

C45 10uF, 50V Ceramic capacitor CGA6P3X7S1H106M250AE TDK

13 2

C58,C59 1000pF, 50V Ceramic capacitor CGA3E2X7R1H102K080AA TDK

14 2

D1,D3 Schottky barrier Diode RB060LAM-40 Rohm

15 1

D2 Schottky barrier Diode RB551VM-30 Rohm

16 1

D4 ESD & CDE protection Diode RCLAMP0502BA Semtech

17 1

D5 SM712 Diode SM712.TCT Semtech

18 2

JP2,JP5 JP1,JP3,JP4,JP6,JP13 HEADER 2 Pin header M20-9990245 Harwin

19 3

JP7,JP8,JP14 HEADER 3X2 Pin header M20-9980345 Harwin

20 7

J6,J7,JP9,JP12, HEADER 3 Pin header M20-9990345 Harwin

JP15,JP16,JP17

21 2

JP10,JP11 HEADER 4X2 Pin header M20-9980445 Harwin

22 0 J1 HEADER 2X2 Pin header M20-9980245 Harwin 23 0 J2 HEADER 6X2 Pin header M20-9980645 Harwin 24 0 J3,J4 HEADER 5X2 Pin header M20-9980545 Harwin 25 0 J5 HEADER 4 Pin header M20-9990445 Harwin 26 1

LED1 Red LED KS DELPS1.22-TIVH-68-H3Q4 OSRAM

27 1

LED2 Green LED KP DELPS1.FP-UGVI-34-Z555 OSRAM

28 1

L1 EMI filter Ferrite bead MI0805K400R-10 Laird

29 1

RTD1 Pt100 RTD PTS060301B100RP100 Vishay

30 14

R1,R2,R6,R7,R10,R11,R17, R67,R73,R75,R86, 0 Resistor RK73Z1JTTD KOA

R18,R68,R70,R74,R88,R98, R87

R99

31 1

R4 R3 5.1k, 0.1%, 15ppm Resistor ERA3-APB512V Panasonic

32 3

R12,R95,R96 R5 390 Resistor RK73B2ATTD391J KOA

33 8

R8,R9,R13,R14,R15,R16, 1k Resistor RK73H1JTTD1001F KOA

R19,R20

34 11

R22,R23,R48,R49,R50,R58, R21,R24,R25,R57, 0 Resistor RK73Z1ETTP KOA

R59,R66,R89,R90,R91 R62,R63

35 8

R26,R27,R28,R29,R60,R61, R30,R31,R32,R71, 10k Resistor RK73B1JTTD103J KOA

R69,R93 R72,R92

36 20

R33,R34,R35,R36,R37,R38, 33 Resistor RK73B1ETTP330J KOA

R39,R40,R41,R42,R43,R44,

R45,R46,R47,R64,R65,R82,

R83,R94

37 1

R51 3k Resistor RK73B1JTTD302J KOA

38 1

R52 0 Resistor RK73Z2ATTD KOA

39 1

R53 68k Resistor RK73H1JTTD6802F KOA

40 1

R54 22k Resistor RK73H1JTTD2202F KOA

41 1

R55 200k Resistor RK73B1JTTD204J KOA

42 1

R56 3.9k Resistor RK73B1JTTD392J KOA

43 1

R77 120 Resistor RK73B2ATTD121J KOA

44 4

R78,R79,R80,R81 4.7k Resistor RK73B1JTTD472J KOA

45 2

R84,R85 100 Resistor RK73B1JTTD101J KOA

46 1

R97 220 Resistor RK73B2ATTD221J KOA

47 0 SO1,SO2,SO3,SO4, Solder link (Open)

SO5,SO6,SO7,SO8, SO9,SO10,SO11,SO12,

SO13 48 0 SS1 Solder link (Short) 49 2

SW1,SW2 TACT switch FSM1LPAS TE Connectivity

50 1

TH1 M3 Through hole tap TH-1.6-M3 MAC8

51 0 TH2,TH3,TH4,TH5 M2 Through hole tap TH-1.6-M2

MAC8

52 2

TP1,TP4, TP2,TP3,TP5,TP6, φ0.8 Test point LC-22-G(Black) MAC8

TP7,TP8,TP9,TP10 53 1

U1 AFE mounted 32-bit MCU IC RX23E-A Renesas

54 1

U2 LDO,Output 2.5 to 12V, 150mA IC ISL80410IBEZ-T7A Renesas

55 1

U3 USB to UART interface IC FT232RL FTDI

56 1

U4 RS-485, half duplex, full fale-safe IC ISL3159EFUZ Renesas

57 1

U5 CAN transceiver IC MAX13053ASA+ Maxim

58 1 Y1 8MHz, 100ppm Crystal oscillator

NX5032GA-8.000M-STD-CSU-1

NDK

M1 4

Polyacetal, both-sides female spacer

Spacer

AS-310

Hirosugi

M2 4

Polycarbonate, M3 6mm

Screw

PC-0306

Hirosugi

M3 8

2 position, 2.54mm pitch

Jumper socket

M7582-05

Harwin

M4 2

4 position, 2.54mm pitch consolidated

Jumper socket

JS-42060-02

Hirosugi

M5 1

Stainless, M2 12mm

Flat head screw

UF-0212

Hirosugi

M6 1 Stainless, M2 Hexagon nut

UNT-02

Hirosugi

Appendix 3. Parts list

※Manufacturer Part Nameは参考情報です。予告なく変更される場合があります。　Manufacturer Part Name is for reference purposes only. It is subject to change without notice.

Rev.

Date

Description

Page

Summary

Revision History RSSKRX23E-A User’s Manual

1.00 Nov.20.19  First Edition issued

1,6,7, 11,12, 14,15,

1.10 Mar.30.20

Appen-

dix iv

Sentence expression revised

Parts changes (Manufacturer Part Name) No.1 FFKDS/H-2,54 x1, FKDSA1/H-5,08 x1 →FFKDSA1/H-2,54-2

No.2 FFKDS/H-2,54 x12, FFKDSA1/H-5,08 x1 →FFKDSA1/H-2,54-13

C - 1

Published by: Renesas Electronics Corporation

RSSKRX23E-A User's Manual

Publication Date: Rev.1.00 Nov.20.19 Rev.1.10 Mar.30.20

RSSKRX23E-A

R20UT4542EJ0110

Renesas RSSKRX23E-A User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Notice

General Precautions in the Handling of Microprocessing Unit and Microcontroller Unit Products

How to Use This Manual

Table of Contents

1. Overview

1.1 Purpose

1.2 Mounted MCU

1.3 Functions and Features

(1) Functions and features for hardware and system design engineers

(2) Functions and features for software design engineers

1.4 Specifications

1.5 System Block Diagram

1.6 Overview and Layout

RSSKRX23E-A 2. Using the RSSKRX23E-A Board

2.1 Operating Conditions

2.2 Selecting Power Supplies

2.3 Connecting a PC to the Board

2.4 Using the Analog Input Circuit

2.4.1 Overview of the Analog Input Circuit

2.4.2 DSAD Measurement Circuit

2.4.3 Thermocouple Measurement Circuit

2.4.4 Reference Junction Compensation Circuit Using the On-Board RTD

2.4.5 Four-Wire RTD Measurement Circuit

2.4.6 Three-Wire RTD Measurement Circuit

2.4.7 Strain Gage Measurement Circuit

2.4.8 Handling Unused Pins in the Analog Input Circuit

RSSKRX23E-A 3. Microcontroller Peripheral Circuits

3.1 USB Serial Communication Circuit

3.2 Emulator Peripheral Circuit

3.3 RS-485 Communication Circuit

3.4 CAN Communication Circuit

3.5 LED Circuit

3.6 Switch Input Circuit

3.7 External Clock Input Circuit

RSSKRX23E-A 4. Board Information

4.1 Using Terminal Blocks

4.2 Connectors

4.3 Pin Headers for Communication Interfaces

4.4 Jumper Pins

4.5 Universal Through-Holes

4.6 Through-Hole Taps

4.7 Test Points

4.8 Short Pads

4.9 Initial Settings of MCU Pins

Appendix

Appendix 1. Board Diagrams

Appendix 2. Circuit Diagram

Appendix 3. Parts list

Revision History RSSKRX23E-A User’s Manual