background image

 

 

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 of these circuits, software, and information in the design of your equipment.  Renesas Electronics assumes no responsibility for any losses incurred by you or third parties arising from the

use of these circuits, software, or information.

2.

Renesas Electronics has used reasonable care in preparing the information included in this document, but Renesas Electronics does not warrant that such information is error free.  Renesas Electronics

assumes no liability whatsoever for any damages incurred by you resulting from errors in or omissions from the information included herein.

3.

Renesas Electronics does not assume any liability for infringement of 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.  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 should not alter, modify, copy, or otherwise misappropriate any Renesas Electronics product, whether in whole or in part.  Renesas Electronics assumes no responsibility for any losses incurred by you or

third parties arising from such alteration, modification, copy or otherwise misappropriation of Renesas Electronics product.

5.

Renesas Electronics products are classified according to the following two quality grades: "Standard" and "High Quality".  The recommended 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 electronic appliances; machine tools; personal electronic

equipment; and industrial robots etc.

"High Quality": Transportation equipment (automobiles, trains, ships, etc.); traffic control systems; anti-disaster systems; anti-crime systems; and safety equipment etc.

Renesas Electronics products are neither intended nor 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 damages (nuclear reactor control systems, military equipment etc.).  You must check the quality grade of each Renesas Electronics product before using it

in a particular application.  You may not use any Renesas Electronics product for any application for which it is not intended.  Renesas Electronics shall not be in any way liable for any damages or losses

incurred by you or third parties arising from the use of any Renesas Electronics product for which the product is not intended by Renesas Electronics.

6.

You should use the Renesas Electronics products described in this document within the range specified by Renesas Electronics, especially with respect to the maximum rating, operating supply voltage

range, movement power voltage range, heat radiation characteristics, installation and other product characteristics.  Renesas Electronics shall have no liability for malfunctions or damages arising out of the

use of Renesas Electronics products beyond such specified ranges.

7.

Although Renesas Electronics endeavors to improve the quality and reliability of its products, semiconductor products have specific characteristics such as the occurrence of failure at a certain rate and

malfunctions under certain use conditions.  Further, Renesas Electronics products are not subject to radiation resistance design.  Please be sure to implement safety measures to guard them against the

possibility of physical injury, and injury or damage caused by fire in the event of the failure of a Renesas Electronics product, 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,

please evaluate 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.  Please use Renesas Electronics

products in compliance with all applicable laws and regulations that regulate the inclusion or use of controlled substances, including without limitation, the EU RoHS Directive.  Renesas Electronics assumes

no liability for damages or losses occurring as a result of your noncompliance with applicable laws and regulations.

9.

Renesas Electronics products and technology may 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 should not use Renesas Electronics products or technology described in this document for any purpose relating to military applications or use by the military, including but not limited to the

development of weapons of mass destruction.  When exporting the Renesas Electronics products or technology described in this document, you should comply with the applicable export control laws and

regulations and follow the procedures required by such laws and regulations.

10. It is the responsibility of the buyer or distributor of Renesas Electronics products, who distributes, disposes of, or otherwise places the product with a third party, to notify such third party in advance of the

contents and conditions set forth in this document, Renesas Electronics assumes no responsibility for any losses incurred by you or third parties as a result of unauthorized use of Renesas Electronics

products.

11. This document may not be 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, or if you have any other inquiries.

(Note 1)

"Renesas Electronics" as used in this document means Renesas Electronics Corporation and also includes its majority-owned subsidiaries.

(Note 2)

"Renesas Electronics product(s)" means any product developed or manufactured by or for Renesas Electronics.

http://www.renesas.com

Refer to "http://www.renesas.com/" for the latest and detailed information.

Renesas Electronics America Inc.

2880 Scott Boulevard Santa Clara, CA 95050-2554, U.S.A.
Tel:  +1-408-588-6000, Fax: +1-408-588-6130

Renesas Electronics Canada Limited

1101 Nicholson Road, Newmarket, Ontario L3Y 9C3, Canada
Tel: +1-905-898-5441, Fax: +1-905-898-3220

Renesas Electronics Europe Limited

Dukes Meadow, Millboard Road, Bourne End, Buckinghamshire, SL8 5FH, U.K
Tel: +44-1628-651-700, Fax: +44-1628-651-804

Renesas Electronics Europe GmbH

Arcadiastrasse 10, 40472 Düsseldorf, Germany
Tel: +49-211-65030, Fax: +49-211-6503-1327

Renesas Electronics (China) Co., Ltd.

7th Floor, Quantum Plaza, No.27 ZhiChunLu Haidian District, Beijing 100083, P.R.China
Tel: +86-10-8235-1155, Fax: +86-10-8235-7679

Renesas Electronics (Shanghai) Co., Ltd.

Unit 301, Tower A, Central Towers, 555 LanGao Rd., Putuo District, Shanghai, China
Tel: +86-21-2226-0888, Fax: +86-21-2226-0999

Renesas Electronics Hong Kong Limited

Unit 1601-1613, 16/F., Tower 2, Grand Century Place, 193 Prince Edward Road West, Mongkok, Kowloon, Hong Kong
Tel: +852-2886-9318, Fax: +852 2886-9022/9044

Renesas Electronics Taiwan Co., Ltd.

13F, No. 363, Fu Shing North Road, Taipei, Taiwan
Tel: +886-2-8175-9600, Fax: +886 2-8175-9670

Renesas Electronics Singapore Pte. Ltd.

80 Bendemeer Road, Unit #06-02 Hyflux Innovation Centre Singapore 339949
Tel: +65-6213-0200, Fax: +65-6213-0300

Renesas Electronics Malaysia Sdn.Bhd.

Unit 906, Block B, Menara Amcorp, Amcorp Trade Centre, No. 18, Jln Persiaran Barat, 46050 Petaling Jaya, Selangor Darul Ehsan, Malaysia
Tel: +60-3-7955-9390, Fax: +60-3-7955-9510

Renesas Electronics Korea Co., Ltd.

12F., 234 Teheran-ro, Gangnam-Gu, Seoul, 135-080, Korea
Tel: +82-2-558-3737, Fax: +82-2-558-5141

SALES OFFICES

© 2014 Renesas Electronics Corporation. All rights reserved. 

Colophon 3.0

 

Summary of Contents for RL78G14

Page 1: ...with high reducing noise performance A thorough system evaluation is necessary after taking the countermeasures mentioned in this document This document provides an explanation using RL78 G14 sample...

Page 2: ...3 Differences between Recommended Layout and Non recommended Layout 6 3 3 1 Wiring of VDD and VSS 6 3 3 2 Oscillator Concerns 6 3 3 3 Bypass Capacitor 6 3 3 4 Wiring of RESET Pin 7 3 3 5 Wiring of REG...

Page 3: ...t to achieve high reducing noise performance The countermeasures of recommended PCB layout are shown in this application note And the AC line noise contrast test with two types of PCB layout boards is...

Page 4: ...scillator from the VSS wiring for the other peripherals 2 3 Bypass Capacitor Place the bypass capacitor between VSS wiring and VDD wiring close to the MCU And make power supply wiring connect to the M...

Page 5: ...ended layout and the non recommended one are designed with the same schematics Figure 3 1 shows the schematics of the circuits around the MCU Figure 3 1 Schematics of the Circuits around the MCU 3 2 P...

Page 6: ...Oscillator circuits X1 C1 and C2 on the recommended board are closer to the MCU than the non recommended one The wiring from oscillator circuit to the MCU on the recommended board is shorter than the...

Page 7: ...pacitor C4 Reason The long wiring between C3 and the MCU REGC pin may become a noise antenna The REGC should be connected to VSS wiring after the bypass capacitor otherwise the bypass capacitor effect...

Page 8: ...sec Note The red LEDs are controlled by the main loop and the yellow LEDs are controlled by the interrupt handler The red and yellow LEDs blink synchronously System initialization Interrupt initializ...

Page 9: ...ink synchronously The MCU status can be evaluated by observing these LEDs If the MCU operates normally within 1 minute the result is considered good and the table is filled with a If the MCU generates...

Page 10: ...3600 3 3 3500 3 3 3400 3 3 3300 3 3 3200 3 3 3100 3 3 3000 3 3 2900 3 3 2800 3 3 2700 3 3 2600 3 3 2500 3 3 2400 3 2300 3 2200 2100 2000 Polarity Voltage Note Voltage Noise value Unit V higher value...

Page 11: ...one is below 2500 V Conclusions from this test are as follows Higher reducing noise performance can be achieved by designing a PCB layout according to the recommendations Due to the high reducing nois...

Page 12: ...uit to modify the VSS connection Refer to the red section in Figure 5 1 Oscillator concerns Cutoff the original wiring which connects the VSS of oscillator circuit to the MCU VSS pin Connect them with...

Page 13: ...he non recommended board the results of reducing noise performance improved drastically But when developing a product the PCB should be redesigned according to the recommended layout Note the followin...

Page 14: ...Software R01US0015EJ The latest versions can be downloaded from the Renesas Electronics website Technical Updates Technical News The latest information can be downloaded from the Renesas Electronics...

Page 15: ...A 1 Revision History Description Rev Date Page Summary 1 00 Feb 28 2014 First edition issued...

Page 16: ...unction are not guaranteed from the moment when power is supplied until the power reaches the level at which resetting has been specified 3 Prohibition of Access to Reserved Addresses Access to reserv...

Page 17: ...nd malfunction prevention appropriate treatment for aging degradation or any other appropriate measures Because the evaluation of microcomputer software alone is very difficult please evaluate the saf...

Reviews: