Renesas RZ/A Series Manuallines
Renesas RZ/A Series Manuallines

Renesas RZ/A Series Manuallines

High-speed usb2.0 board design
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RZ/A1
Guidelines for High-Speed USB2.0 Board Design
Introduction
This application note details guidelines for the design of High-Speed USB2.0 circuit boards.
Target LSIs
The following groups in the RZ/A Series
RZ/A1H*
*
group, RZ/A1M*
1,
2
RZ/A1L*
*
group, RZ/A1LU*
1,
3
Notes: The contents in this application note are reference examples based on the USB standard, and signal
quality in the system is not guaranteed. When incorporated into an actual system, sufficient
verification and evaluation of the system overall should be performed, and determination of
applicability is the customer's responsibility.
"Group" will be omitted in the rest of this application note.
*1. In this application note, when indicating these groups collectively, it will be noted as "RZ/A1".
*2. In this application note, when indicating these groups collectively, it will be noted as "RZ/A1HM".
*3. In this application note, when indicating these groups collectively, it will be noted as "RZ/A1L".
Reference Application Notes
For additional information associated with this document, refer to the following application notes.
• RZ/A Series Hardware Design Guide (R01AN4813EJ)
R01AN5119EJ0120 Rev.1.20
May.26.20
*
group
1,
2
*
group, RZ/A1LC*
1,
3
1,
*
group
3
Application Note
Page 1 of 17

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Summary of Contents for Renesas RZ/A Series

  • Page 1 Application Note RZ/A1 Guidelines for High-Speed USB2.0 Board Design Introduction This application note details guidelines for the design of High-Speed USB2.0 circuit boards. Target LSIs The following groups in the RZ/A Series RZ/A1H* group, RZ/A1M* group RZ/A1L* group, RZ/A1LU* group, RZ/A1LC*...
  • Page 2: Table Of Contents

    RZ/A1 Guidelines for High-Speed USB2.0 Board Design Contents Introduction ..........................3 USB Transmission Line ......................4 Power Supply and Ground Patterns ..................6 Oscillation Circuit ........................8 VBUS Power Supply Circuit ..................... 9 REFRIN Pin ........................... 11 EMI/ESD Protection ....................... 13 Checklist ..........................
  • Page 3: Introduction

    RZ/A1 Guidelines for High-Speed USB2.0 Board Design 1. Introduction This application note provides an explanation using the USB2.0 Host/Function Module's pin names. Table 1.1 shows the USB2.0 Host/Function module pin overview. Table 1.1 USB2.0 Host/Function Module pin overview Used Pin Name Input/Output Function DP1, DP0...
  • Page 4: Usb Transmission Line

    RZ/A1 Guidelines for High-Speed USB2.0 Board Design 2. USB Transmission Line The USB transmission line indicates the wiring pattern that connects the USB connector and the USB transceiver. USB2.0 has High-Speed, Full-Speed, and Low-Speed communication modes. High-Speed has a communication speed of 480 Mbps, so it is necessary to design the USB transmission line as a high frequency circuit.
  • Page 5 RZ/A1 Guidelines for High-Speed USB2.0 Board Design The lower layer of the USB transmission lines must be a ground plane. The ground plane must be at least 1 mm wider than the transmission lines. Spacing between USB transmission line and Ground ground plane should be 3 times or greater...
  • Page 6: Power Supply And Ground Patterns

    RZ/A1 Guidelines for High-Speed USB2.0 Board Design 3. Power Supply and Ground Patterns Notes on designing power supply and ground patterns are described below. • Power supplies and ground patterns should be separated into digital and analog. Table 3.1 and Table 3.2 show the power supply and ground classifications.
  • Page 7 RZ/A1 Guidelines for High-Speed USB2.0 Board Design • The pins connected internally in the LSI shall also be connected to the ground on the board with low impedance. • The layer plane patterns of power supplies and grounds shall be designed widely as much as possible. •...
  • Page 8: Oscillation Circuit

    RZ/A1 Guidelines for High-Speed USB2.0 Board Design 4. Oscillation Circuit Notes on designing the oscillation circuit are described below. • Allocate the oscillator circuit near the USB_X1 USB clock input pin. It is recommended that the USB_X1 be grounded with a guard ring to the digital ground. •...
  • Page 9: Vbus Power Supply Circuit

    IC with over-current protection for the USB power supply bus (hereinafter called “USB power supply switch IC”), such as the Renesas Electronics ISL6186 is recommended for the VBUS power supply control. Make sure to consider the limitation value of the current for the VBUS power supply line based on the current value used by the applicable system power supply and the USB function devices being communicated with.
  • Page 10 RZ/A1 Guidelines for High-Speed USB2.0 Board Design Filter circuit USB connector RZ/A1 100 Ω to 1 kΩ VBUSn VBUS 1.0 µF to 10 µF Digital ground (DGND) Note: n = 0 or 1 Figure 5.2 Example of VBUS circuit for using RZ/A1 as a function controller R01AN5119EJ0120 Rev.1.20 Page 10 of 17 May.26.20...
  • Page 11: Refrin Pin

    RZ/A1 Guidelines for High-Speed USB2.0 Board Design 6. REFRIN Pin Notes on designing the REFRIN pin peripheral circuit are described below. • Connect a 5.6 kΩ ± 1% resistor (hereinafter called "reference resistor") between the REFRIN pin and USBAPVss . The resistor should be connected to REFRIN pin without using a via if at all possible. •...
  • Page 12 RZ/A1 Guidelines for High-Speed USB2.0 Board Design Connection diagram Pattern design example RZ/A1 REFRIN REFRIN 5.6 kΩ ± 1% RZ/A1 Digital ground (DGND) 5.6 kΩ ± 1% Chip resistor Figure 6.2 REFRIN pin peripheral connection diagram and example of pattern design 2 (BGA package) R01AN5119EJ0120 Rev.1.20 Page 12 of 17...
  • Page 13: Emi/Esd Protection

    RZ/A1 Guidelines for High-Speed USB2.0 Board Design 7. EMI/ESD Protection Notes on EMI/ESD protection are described below. • When components for EMI/ESD protection such as coils and diodes are mounted on the USB transmission lines, they should be allocated near the USB transmission lines and the wiring should be as short as possible.
  • Page 14: Checklist

    RZ/A1 Guidelines for High-Speed USB2.0 Board Design 8. Checklist Table 8.1 Checklist 1 (circuit diagram) Item Check Items (circuit diagram) ✔ Reference Number Isn't an external resistor place on the transmission line? Is the treatment of pins correct? Is REFRIN pin connected to USBAPVss via a 5.6 kΩ...
  • Page 15 RZ/A1 Guidelines for High-Speed USB2.0 Board Design Table 8.2 Checklist 2 (pattern diagram) Item Check Items (pattern diagram) ✔ Reference Number Are the transmission lines correct? Is the differential impedance 90 Ω ± 15%? When using RZ/A1 as a host controller, is the wiring length 300 mm or less? Table 2.1 When using RZ/A1 as a function controller, is the wiring length 100 mm or less?
  • Page 16: Reference Documents

    • Hardware manual RZ/A1H Group, RZ/A1M Group User's Manual: Hardware (R01UH0403EJ) (The latest version can be downloaded from the Renesas Electronics website.) RZ/A1L Group, RZ/A1LU Group, RZ/A1LC Group User's Manual: Hardware (R01UH0437EJ) (The latest version can be downloaded from the Renesas Electronics website.) 10.
  • Page 17: Revision History

    RZ/A1 Guidelines for High-Speed USB2.0 Board Design Revision History Rev. Date Description Page Summary 1.00 2019.11.26 First edition issued (Japanese edition only). 1.10 2019.12.26 Unification of notation: • For pin names other than RZ/A1, DP is changed to D+, and DM is changed to D-.
  • Page 18 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.
  • Page 19 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.

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