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RX Family
Hardware Design Guide
Introduction
This application note presents notes on board design and layout examples when using RX Family MCUs.
Target Device
RX Family
Contents
1.
Board Configuration ................................................................................................................. 2
1.1
Block Diagram ......................................................................................................................................... 2
1.2
Component Layout .................................................................................................................................. 3
1.3
Layer Structure ........................................................................................................................................ 5
2.
Board Design ........................................................................................................................... 7
2.1
Power Supply Pins .................................................................................................................................. 7
2.2
VCL Pin ................................................................................................................................................... 9
2.2.1
Two-Layer Board ................................................................................................................................. 11
2.2.2
Board With Four or More Layers ......................................................................................................... 13
2.3
Reset Pin ............................................................................................................................................... 14
2.4
Clock I/O Pins ........................................................................................................................................ 16
2.5
Analog Input Pins .................................................................................................................................. 21
2.6
Signal Pins with Large Current Flows ................................................................................................... 23
2.7
Signal Pins with Rapid Level Changes ................................................................................................. 23
3.
Board Wiring Pattern Examples ............................................................................................. 24
3.1
Example Two-Layer Board Wiring Pattern ............................................................................................ 24
3.2
Example Four-Layer Board Wiring Pattern ........................................................................................... 27
4.
Reference Documents ........................................................................................................... 31
Revision History ............................................................................................................................ 32
R01AN1411EJ0110 Rev.1.10
Oct.26.21
Application Note
Page 1 of 32
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Table of Contents
Related Manuals for Renesas RX Family
Summary of Contents for Renesas RX Family
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Page 1: Table Of Contents
Application Note RX Family Hardware Design Guide Introduction This application note presents notes on board design and layout examples when using RX Family MCUs. Target Device RX Family Contents Board Configuration ......................... 2 Block Diagram ............................2 Component Layout ..........................3 Layer Structure ............................ -
Page 2: Board Configuration
RX Family Hardware Design Guide 1. Board Configuration 1.1 Block Diagram Figure 1.1 shows a block diagram of the board configuration used in the design example. External power supply 3.3 V Power supply circuit Reset signal Reset circuit Main clock... -
Page 3: Component Layout
RX Family Hardware Design Guide 1.2 Component Layout Figure 1.2 and Figure 1.3 show component layout examples. Note that the board thickness is typically 1.6 mm. The feedback resistor (R2) and damping resistors (R3 and R5) are usually unnecessary. (In Figure 1.2 no feedback resistors are mounted.) If the oscillator manufacturer stipulates that external feedback resistors or... - Page 4 RX Family Hardware Design Guide Figure 1.3 Component Layout (Back Side) R01AN1411EJ0110 Rev.1.10 Page 4 of 32 Oct.26.21...
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Page 5: Layer Structure
RX Family Hardware Design Guide 1.3 Layer Structure Figure 1.4 shows layer structure examples. First-layer wiring pattern First-layer wiring pattern Power supply, signal, and Signal and analog power supply analog power supply Second-layer wiring pattern Second-layer wiring pattern GND, signal, and analog GND... - Page 6 RX Family Hardware Design Guide Figure 1.5 shows an example wiring pattern for a two-layer board. Analog power supply Analog Single-point Subclock connection to analog GND Reset IC +3.3 V Main clock +3.3 V +3.3 V RX Family Red: +3.3 V route...
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Page 7: Board Design
Refer to the application notes below for details of the analog power-supply pins. The latest versions and guides to new products can be downloaded from the Renesas Electronics website. • RX610 Group: Notes on Analog Power Supply Printed Circuit Board Patterns (R01AN0271EJ) •... - Page 8 Figure 2.2 shows an example power supply pin circuit configuration, and Figure 2.3 shows an example power supply pin wiring pattern Connection to power supply RX Family MCU Figure 2.2 Example Power Supply Pin Circuit Configuration Bypass Make connection to through capacitor hole via a capacitor.
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Page 9: Vcl Pin
RX Family Hardware Design Guide 2.2 VCL Pin Connect the VCL pin to GND via a capacitor with a rated capacitance matching that specified in the user’s manual of the device used. The wiring length between the VCL pin and the capacitor should be 8 mm or less (4 mm or less if possible). - Page 10 Hardware Design Guide Figure 2.5 shows an example circuit configuration for the VCL pin. Refer to the user’s manual of the device RX Family MCU used regarding the rated capacitance of the capacitor connected to the VCL pin. Figure 2.5 Example VCL Pin Circuit Configuration R01AN1411EJ0110 Rev.1.10...
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Page 11: Two-Layer Board
RX Family Hardware Design Guide 2.2.1 Two-Layer Board • Use the GND wiring pattern to form a guard for the portion of the back side between the VCL pin and the capacitor. • Make connections to GND via at least four through holes. - Page 12 RX Family Hardware Design Guide Figure 2.7 shows an example VCL pin wiring pattern (two-layer board). Four or more GND capacitor through holes GND under VCL signal VCL pin VBAT pin Four or more GND through holes VSS pin Figure 2.7 Example VCL Pin Wiring Pattern (Two-Layer Board) R01AN1411EJ0110 Rev.1.10...
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Page 13: Board With Four Or More Layers
RX Family Hardware Design Guide 2.2.2 Board With Four or More Layers Figure 2.8 shows an example VCL pin wiring pattern (board with four or more layers). Four or more GND capacitor Make a slit to allow through holes coupling of the VCL capacitor and VSS pin. -
Page 14: Reset Pin
Figure 2.9 shows an example reset pin circuit configuration, and Figure 2.10 shows an example reset pin wiring pattern (multilayer board). RES# Reset IC RX Family MCU (RNA51957) Figure 2.9 Example Reset Pin Circuit Configuration (With Low-Pass Filter) Depending on the specifications... - Page 15 RX Family Hardware Design Guide Figure 2.11 shows an example reset pin wiring pattern. Reset IC RX Family Filter circuit RES# pin Reset signal VSS pin Figure 2.11 Example Reset Pin Wiring Pattern R01AN1411EJ0110 Rev.1.10 Page 15 of 32 Oct.26.21...
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Page 16: Clock I/O Pins
Refer to the application notes below for information on crystal oscillators with low load capacitance (low-C crystal oscillators). The latest versions and guides to new products can be downloaded from the Renesas Electronics website. - Page 17 RX Family Hardware Design Guide Figure 2.13, Figure 2.14, and Figure 2.15 show example clock I/O pin wiring patterns. The inner layers must have no wiring traces in the areas enclosed by the yellow borders, which is used for the GND wiring pattern on the back side.
- Page 18 RX Family Hardware Design Guide Crystal oscillator RX Family The front side GND shielding width should be at least 0.3 mm. XCIN XCOUT XTAL EXTAL Crystal oscillator Through hole for VSS coupling Through hole Resistor Capacitor Front side wiring pattern Figure 2.14 Example Clock I/O Pin Wiring Pattern (Front Side)
- Page 19 RX Family Hardware Design Guide The back side GND wiring pattern is divided into three “islands” as indicated by the yellow borders, one for each crystal oscillator. The wiring pattern also allows for VSS coupling. Through hole for VSS coupling...
- Page 20 RX Family Hardware Design Guide Figure 2.16 shows an example clock I/O pin wiring pattern. Crystal oscillator GND guard Limiting resistor GND guard XCIN XCOUT Limiting resistor XTAL EXTAL Feedback resistor Crystal oscillator Figure 2.16 Example Clock I/O Pin Wiring R01AN1411EJ0110 Rev.1.10...
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Page 21: Analog Input Pins
Figure 2.17 shows an example analog input pin circuit configuration, and Figure 2.18 shows an example analog input pin wiring pattern. circuit ANxxx* Sensor RX Family MCU AVSS Note: 1. ANxxx represents an analog input pin. Figure 2.17 Example Analog Input Pin Circuit Configuration R01AN1411EJ0110 Rev.1.10 Page 21 of 32 Oct.26.21... - Page 22 RX Family Hardware Design Guide Analog input Analog GND shield The analog signal is shielded by the analog GND wiring trace (trace width at least 0.3 mm). Space between analog GND shield Analog power and analog input supply signal trace (0.3 mm to 2.0 mm)
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Page 23: Signal Pins With Large Current Flows
RX Family Hardware Design Guide 2.6 Signal Pins with Large Current Flows When a large current exceeding the current range supported by the MCU flows in a signal line, place the signal line as far from the MCU (and the oscillators in particular) as possible, and do not arrange the signal line in parallel with or across the traces of the reset pin, clock I/O pins, or analog input pins. -
Page 24: Board Wiring Pattern Examples
3. Board Wiring Pattern Examples 3.1 Example Two-Layer Board Wiring Pattern Figure 3.1 shows an example two-layer board wiring pattern for an RX Family MCU, and Figure 3.2 and Figure 3.3 show the wiring patterns for the first and second layers separately. - Page 25 RX Family Hardware Design Guide Analog power supply Reset IC (RNA51957) +3.3 V RX Family +3.3 V Power IC +5 V (ISL80030) Main clock oscillator Sub-clock oscillator GND guard/analog GND guard Figure 3.2 Example Board Wiring Pattern (First Layer Wiring Pattern) R01AN1411EJ0110 Rev.1.10...
- Page 26 RX Family Hardware Design Guide Analog +3.3 V Figure 3.3 Example Board Wiring Pattern (Second Layer Wiring Pattern) R01AN1411EJ0110 Rev.1.10 Page 26 of 32 Oct.26.21...
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Page 27: Example Four-Layer Board Wiring Pattern
3.2 Example Four-Layer Board Wiring Pattern Figure 3.4 shows an example four-layer board wiring pattern for an RX Family MCU, and Figure 3.5, Figure 3.6, Figure 3.7, and Figure 3.8 show the wiring patterns for each of the individual layers separately. - Page 28 RX Family Hardware Design Guide Analog power supply Reset IC (RNA51957) RX Family +5 V Power IC (ISL80030) Main clock oscillator Sub-clock oscillator GND guard/Analog GND guard Figure 3.5 Example Board Wiring Pattern (First Layer Wiring Pattern) R01AN1411EJ0110 Rev.1.10 Page 28 of 32...
- Page 29 RX Family Hardware Design Guide Refer to Figure 2.8 for the purpose of the slits. Figure 3.6 Example Board Wiring Pattern (Second Layer Wiring Pattern) R01AN1411EJ0110 Rev.1.10 Page 29 of 32 Oct.26.21...
- Page 30 RX Family Hardware Design Guide Refer to Figure 2.8 for the purpose of the slits. +3.3 V +3.3 V Figure 3.7 Example Board Wiring Pattern (Third Layer Wiring Pattern) Analog Figure 3.8 Example Board Wiring Pattern (Fourth Layer Wiring Pattern) R01AN1411EJ0110 Rev.1.10...
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Page 31: Reference Documents
• User’s Manual: Hardware Catalog • User’s Manual: Hardware for each product group in the RX Family (The latest version for each device can be downloaded from the Renesas Electronics website.) • RX610 Group: Notes on Analog Power Supply Printed Circuit Board Patterns (R01AN0271EJ) •... -
Page 32: Revision History
RX Family Hardware Design Guide Revision History Description Rev. Date Page Summary ⎯ 1.00 Aug. 29, 2013 First edition issued 1.01 Sep. 26, 2014 1.2 VCL Pin description modified Figure 1.14 Pattern Example for the Analog Input Pin modified 3. Reference Documents modified 1.10... - Page 33 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 34 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.