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Renesas RX23W Application Note

Renesas RX23W Application Note

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RX23W Group
Guidelines for Bluetooth Board Design
Introduction
This document describes RF board design guidelines for RX23W Bluetooth
RF transceiver. Please refer "RX Family Hardware Design Guide for board design" (R01AN1411) except
Bluetooth 5.0 RF transceiver part.
Target Device
RX23W Group
Note: The contents of this document are provided as a reference and do not guarantee the signal quality in
the system. When designing the actual system, thoroughly evaluate the product in the overall system
and apply these contents on your own responsibility.
Contents
1.
Overview .................................................................................................................................... 3
1.1
Related documents ................................................................................................................................. 3
2.
Board design guidelines for RX23W QFN ................................................................................. 4
2.1
RX23W QFN Pin list ................................................................................................................................ 4
2.2
Oscillator circuit for Bluetooth-dedicated clock ....................................................................................... 5
2.3
Antenna connection pin ........................................................................................................................... 8
2.4
Power supply mode for Bluetooth 5.0 RF transceiver ........................................................................... 12
2.4.1
DC-DC converter mode ....................................................................................................................... 12
2.4.2
Linear regulator mode ......................................................................................................................... 15
2.5
Power supply and ground patterns........................................................................................................ 17
2.5.1
Power supply ....................................................................................................................................... 17
2.5.2
Ground ................................................................................................................................................. 18
2.6
Circuit diagram for reference ................................................................................................................. 20
2.7
Parts list for reference ........................................................................................................................... 21
3.
Board design guidelines for RX23W BGA ............................................................................... 22
3.1
RX23W BGA Pin list .............................................................................................................................. 22
3.2
Oscillator circuit for Bluetooth-dedicated clock ..................................................................................... 23
3.3
Antenna connection pin ......................................................................................................................... 26
3.4
Power supply mode for Bluetooth 5.0 RF transceiver ........................................................................... 30
3.4.1
DC-DC converter mode ....................................................................................................................... 30
3.4.2
Linear regulator mode ......................................................................................................................... 33
3.5
Power supply and ground patterns........................................................................................................ 35
3.5.1
Power supply ....................................................................................................................................... 35
R01AN4534EJ0201 Rev.2.01
Sep.30.21
Application Note
®
5.0 (Core Specification v5.0)
Page 1 of 52

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Summary of Contents for Renesas RX23W

  • Page 1: Table Of Contents

    Application Note RX23W Group Guidelines for Bluetooth Board Design Introduction This document describes RF board design guidelines for RX23W Bluetooth ® 5.0 (Core Specification v5.0) RF transceiver. Please refer "RX Family Hardware Design Guide for board design" (R01AN1411) except Bluetooth 5.0 RF transceiver part.
  • Page 2 ® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use of such marks by Renesas Electronics Corporation is under license. Other trademarks and registered trademarks are the property of their respective owners. R01AN4534EJ0201 Rev.2.01 Page 2 of 52 Sep.30.21...

  • Page 3: Overview

    Guidelines for Bluetooth Board Design 1. Overview Sections 2, 3, and 4 of this document describe board design guidelines for RX23W QFN package, RX23W BGA package, and RX23W LGA package, respectively. This document briefly describes the Bluetooth 5.0 RF transceiver unit pins used in the RX23W.

  • Page 4: Board Design Guidelines For Rx23W Qfn

    2. Board design guidelines for RX23W QFN 2.1 RX23W QFN Pin list Table 2-1 is the description of Bluetooth 5.0 RF transceiver unit pins in RX23W QFN. Table 2-1 Description of Bluetooth 5.0 RF transceiver unit pins in RX23W QFN...

  • Page 5: Oscillator Circuit For Bluetooth-Dedicated Clock

    • Place the crystal resonator close to the “XTAL1_RF” and “XTAL2_RF” pins. We recommend the wiring length between the RX23W and the crystal resonator of approximately 6 mm, as shown in "Figure 2-2 Example of the pattern around the crystal resonator".
  • Page 6 RX23W Group Guidelines for Bluetooth Board Design VSS_RF XTAL2_RF XTAL1_RF Note: The resistance of Rd and Rf should be determined thorough oscillation characteristics evaluation with a crystal resonator to be mounted. These resistors might not be required, depending on the oscillation characteristics.
  • Page 7 RX23W Group Guidelines for Bluetooth Board Design Table 2-2 shows confirmed operation crystal resonator list (reference). Table 2-2 Tested crystal resonator list (reference) Equivalent SMD/Lead Frequency Frequency Load Frequency Series Manufacturer Parts number size code Tolerance Stability Capacitance (MHz) Resistance...

  • Page 8: Antenna Connection Pin

    RX23W Group Guidelines for Bluetooth Board Design 2.3 Antenna connection pin Note the followings for antenna connection pin design. • Adjust the characteristic impedance of 50ohm for the signal line from an antenna to “ANT” pin. Optimize the width of signal line and the gap between signal line and ground pattern, considering the PCB permittivity and layer thickness.
  • Page 9 RX23W Group Guidelines for Bluetooth Board Design • Pay attention to an emission level of 5th order harmonics, when selecting 4 dBm transmitted output mode and evaluating of US(FCC) regulatory with a coaxial cable. The emission should be suppressed with an RF filter implementation.
  • Page 10 RX23W Group Guidelines for Bluetooth Board Design Figure 2-5 shows an example of LPF using SMD parts L201 C201 C201 = GJM1555C1HR20WB01 (0.2pF +/-0.05pF) L201 = LQG15HS1N5S02 (1.5nH +/-0.3nH) Figure 2-5 Example of LPF using SMD parts Note: Depending on the PCB design, the value may differ. Adjust the value, if necessary.
  • Page 11 RX23W Group Guidelines for Bluetooth Board Design • When certifying of Korea (KCC) regulatory, an emission of 1.9GHz frequency band should be suppressed with an RF filter implementation. RF filter requirements Frequency band to be suppressed: 1921 to 1984 MHz Minimum attenuation: 7dB This document describes an example of a notch filter.

  • Page 12: Power Supply Mode For Bluetooth 5.0 Rf Transceiver

    RX23W Group Guidelines for Bluetooth Board Design 2.4 Power supply mode for Bluetooth 5.0 RF transceiver Note the followings for external circuit design in each power supply mode of the Bluetooth 5.0 RF transceiver. User should select the power mode for Bluetooth 5.0 RF transceiver which DC-DC converter mode or Linear regulator mode.
  • Page 13 RX23W Group Guidelines for Bluetooth Board Design Figure 2-7 shows an example of the external circuit for DC-DC converter mode, Figure 2-8 shows an example of the PCB pattern. VCC_RF DCLOUT DCLIN_D DCLIN_A VSS_RF L1 = 10uH L2 = short (reserved inductor) C1 = 2.2uF...
  • Page 14 RX23W Group Guidelines for Bluetooth Board Design Figure 2-8 Example of the PCB pattern for DC-DC converter mode R01AN4534EJ0201 Rev.2.01 Page 14 of 52 Sep.30.21...

  • Page 15: Linear Regulator Mode

    RX23W Group Guidelines for Bluetooth Board Design 2.4.2 Linear regulator mode Note the followings in external circuit design for the Linear regulator mode. • Make the signal pattern from “DCLOUT” pin to “VSS_RF” through “C1” shorter and wider for low impedance connection.
  • Page 16 RX23W Group Guidelines for Bluetooth Board Design Figure 2-10 Example of the PCB pattern for Linear regulator mode R01AN4534EJ0201 Rev.2.01 Page 16 of 52 Sep.30.21...

  • Page 17: Power Supply And Ground Patterns

    RX23W Group Guidelines for Bluetooth Board Design 2.5 Power supply and ground patterns Note the followings for power supply patterns and ground patterns design. 2.5.1 Power supply Note the followings for power supply patterns design. • Not bring other power, and ground lines close up “AVCC_RF” and “VCC_RF” to avoid noise couplings.

  • Page 18: Ground

    RX23W Group Guidelines for Bluetooth Board Design 2.5.2 Ground Note the followings for ground patterns design. • Design a ground pattern to be as wide plane as possible. • When using ground pattern as the shield line, place away from the oscillation circuit and the digital circuit as much as possible not to give noise the shield line.
  • Page 19 RX23W Group Guidelines for Bluetooth Board Design Figure 2-12 shows an example of the ground pattern. Figure 2-12 Example of the ground pattern R01AN4534EJ0201 Rev.2.01 Page 19 of 52 Sep.30.21...

  • Page 20: Circuit Diagram For Reference

    RX23W Group Guidelines for Bluetooth Board Design 2.6 Circuit diagram for reference Figure 2-13 shows a reference circuit diagram in which the Bluetooth 5.0 RF transceiver related part is only described. Figure 2-13 Circuit diagram (for reference) R01AN4534EJ0201 Rev.2.01 Page 20 of 52...

  • Page 21: Parts List For Reference

    2.7 Parts list for reference Table 2-3 lists the parts. Table 2-3 Parts list (for reference) Mount Parts Size code Type Value Parts number Manufacturer Reference (mm) RX23W QFN chip Renesas 1612 Crystal 32.00MHz CX1612DB32000A0WPNC1 Kyocera Inductor for decoupling 10uH MLZ1608M100WT000 (*1) circuits (*1)

  • Page 22: Board Design Guidelines For Rx23W Bga

    3. Board design guidelines for RX23W BGA 3.1 RX23W BGA Pin list Table 3-1 is the description of Bluetooth 5.0 RF transceiver unit pins in RX23W BGA. Table 3-1 Description of Bluetooth 5.0 RF transceiver unit pins in RX23W BGA...

  • Page 23: Oscillator Circuit For Bluetooth-Dedicated Clock

    • Place the crystal resonator close to the “XTAL1_RF” and “XTAL2_RF” pins. We recommend the wiring length between the RX23W and the crystal resonator of approximately 7 mm, as shown in "Figure 3-2 Example of the pattern around the crystal resonator".
  • Page 24 RX23W Group Guidelines for Bluetooth Board Design VSS_RF XTAL2_RF XTAL1_RF Note: The resistance of Rd and Rf should be determined thorough oscillation characteristics evaluation with a crystal resonator to be mounted. These resistors might not be required, depending on the oscillation characteristics.
  • Page 25 RX23W Group Guidelines for Bluetooth Board Design Table 3-2 shows confirmed operation crystal resonator list (reference). Table 3-2 Tested crystal resonator list (reference) Equivalent SMD/Lead Frequency Frequency Load Frequency Series Manufacturer Parts number size code Tolerance Stability Capacitance (MHz) Resistance...

  • Page 26: Antenna Connection Pin

    RX23W Group Guidelines for Bluetooth Board Design 3.3 Antenna connection pin Note the followings for antenna connection pin design. • Adjust the characteristic impedance of 50ohm for the signal line from an antenna to “ANT” pin. Optimize the width of signal line and the gap between signal line and ground pattern, considering the PCB permittivity and layer thickness.
  • Page 27 RX23W Group Guidelines for Bluetooth Board Design • Pay attention to an emission level of 5th order harmonics, when selecting 4 dBm transmitted output mode and evaluating of US(FCC) regulatory with a coaxial cable. The emission should be suppressed with an RF filter implementation.
  • Page 28 RX23W Group Guidelines for Bluetooth Board Design Figure 3-5 shows an example of LPF using SMD parts L201 C201 C201 = GJM1555C1HR20WB01 (0.2pF +/-0.05pF) L201 = LQG15HS1N5S02 (1.5nH +/-0.3nH) Figure 3-5 Example of LPF using SMD parts Note: Depending on the PCB design, the value may differ. Adjust the value, if necessary.
  • Page 29 RX23W Group Guidelines for Bluetooth Board Design • When certifying of Korea (KCC) regulatory, an emission of 1.9GHz frequency band should be suppressed with an RF filter implementation. RF filter requirements Frequency band to be suppressed: 1921 to 1984 MHz Minimum attenuation: 7dB This document describes an example of a notch filter.

  • Page 30: Power Supply Mode For Bluetooth 5.0 Rf Transceiver

    RX23W Group Guidelines for Bluetooth Board Design 3.4 Power supply mode for Bluetooth 5.0 RF transceiver Note the followings for external circuit design in each power supply mode of the Bluetooth 5.0 RF transceiver. User should select the power mode for Bluetooth 5.0 RF transceiver which DC-DC converter mode or Linear regulator mode.
  • Page 31 RX23W Group Guidelines for Bluetooth Board Design Figure 3-7 shows an example of the external circuit for DC-DC converter mode, Figure 3-8 shows an example of the PCB pattern. VCC_RF DCLOUT DCLIN_D DCLIN_A VSS_RF L1 = 10uH L2 = 4.7nH C1 = 2.2uF...
  • Page 32 RX23W Group Guidelines for Bluetooth Board Design Figure 3-8 Example of the PCB pattern for DC-DC converter mode R01AN4534EJ0201 Rev.2.01 Page 32 of 52 Sep.30.21...

  • Page 33: Linear Regulator Mode

    RX23W Group Guidelines for Bluetooth Board Design 3.4.2 Linear regulator mode Note the followings in external circuit design for the Linear regulator mode. • Make the signal pattern from “DCLOUT” pin to “VSS_RF” through “C1” shorter and wider for low impedance connection.
  • Page 34 RX23W Group Guidelines for Bluetooth Board Design Figure 3-10 Example of the PCB pattern for Linear regulator mode R01AN4534EJ0201 Rev.2.01 Page 34 of 52 Sep.30.21...

  • Page 35: Power Supply And Ground Patterns

    RX23W Group Guidelines for Bluetooth Board Design 3.5 Power supply and ground patterns Note the followings for power supply patterns and ground patterns design. 3.5.1 Power supply Note the followings for power supply patterns design. • Not bring other power, and ground lines close up “AVCC_RF” and “VCC_RF” to avoid noise couplings.

  • Page 36: Ground

    RX23W Group Guidelines for Bluetooth Board Design 3.5.2 Ground Note the followings for ground patterns design. • Design a ground pattern to be as wide plane as possible. • When using ground pattern as the shield line, place away from the oscillation circuit and the digital circuit as much as possible not to give noise the shield line.
  • Page 37 RX23W Group Guidelines for Bluetooth Board Design Figure 3-12 shows an example of the ground pattern. Figure 3-12 Example of the ground pattern R01AN4534EJ0201 Rev.2.01 Page 37 of 52 Sep.30.21...

  • Page 38: Circuit Diagram For Reference

    RX23W Group Guidelines for Bluetooth Board Design 3.6 Circuit diagram for reference Figure 3-13 shows a reference circuit diagram in which the Bluetooth 5.0 RF transceiver related part is only described. Figure 3-13 Circuit diagram (for reference) R01AN4534EJ0201 Rev.2.01 Page 38 of 52...

  • Page 39: Parts List For Reference

    3.7 Parts list for reference Table 3-3 lists the parts. Table 3-3 Parts list (for reference) Mount Parts Size code Type Value Parts number Manufacturer Reference (mm) RX23W BGA chip Renesas 1612 Crystal 32.00MHz CX1612DB32000A0WPNC1 Kyocera Inductor for decoupling 10uH MLZ1608M100WT000 (*1) circuits (*1)

  • Page 40: Board Design Guidelines For Rx23W Lga

    4. Board design guidelines for RX23W LGA The RX23W LGA is a module incorporating a crystal resonator for Bluetooth-dedicated clock and a small PCB trace antenna. We strongly recommend the use of four-layer or six-layer boards for the main board design.

  • Page 41: Rx23W Lga Pin List

    Guidelines for Bluetooth Board Design 4.1 RX23W LGA Pin list Table 4-1 is the description of Bluetooth 5.0 RF transceiver unit pins in RX23W LGA. Figure 4-1 shows an example of connections for each pin. Table 4-1 Description of Bluetooth 5.0 RF transceiver unit pins in RX23W LGA...
  • Page 42 RX23W Group Guidelines for Bluetooth Board Design Figure 4-1 Example of connections for each pin R01AN4534EJ0201 Rev.2.01 Page 42 of 52 Sep.30.21...

  • Page 43: Oscillator Circuit For Bluetooth-Dedicated Clock

    RX23W Group Guidelines for Bluetooth Board Design 4.2 Oscillator circuit for Bluetooth-dedicated clock Note the followings for "XTAL1_RF" and "XTAL2_RF" pins design. 2-1. The crystal resonator and external load capacitors (CL) for frequency tuning are unnecessary, because they are built in IC.

  • Page 44: Power Supply Mode For Bluetooth 5.0 Rf Transceiver

    RX23W Group Guidelines for Bluetooth Board Design 4.4 Power supply mode for Bluetooth 5.0 RF transceiver Note the followings for "DCLOUT", "DCLIN_A" and "DCLIN_D" pins design. 4-1. The capacitor for Linear regulator is unnecessary, because the capacitor is built in IC.
  • Page 45 RX23W Group Guidelines for Bluetooth Board Design Figure 4-3 shows an example of the pattern under the RX23W LGA package. Figure 4-3 Example of the pattern under the RX23W LGA package R01AN4534EJ0201 Rev.2.01 Page 45 of 52 Sep.30.21...

  • Page 46: Antenna Layout

    RX23W Group Guidelines for Bluetooth Board Design 4.6 Antenna layout Note the followings for the internal antenna patterns design. The antenna is built in the unsputtered 6.1x3.0mm area, as shown in Figure 4-4. Figure 4-4 Antenna built in area 6-1. Place this MCU near the top right corner of the main board.
  • Page 47 RX23W Group Guidelines for Bluetooth Board Design Figure 4-5 shows an example of the antenna layout. Figure 4-5 Example of the antenna layout R01AN4534EJ0201 Rev.2.01 Page 47 of 52 Sep.30.21...

  • Page 48: Main Board Design

    RX23W Group Guidelines for Bluetooth Board Design 4.7 Main Board Design To secure the antenna characteristics, take into account the following points to note in mounting this module on the main board. 7-1. It is recommended that the length of the main board is longer than 40 mm to get optimal antenna performance, because the image antenna including the ground is formed on the main board.

  • Page 49: Emission Characteristics

    RX23W Group Guidelines for Bluetooth Board Design 4.8 Emission characteristics Figure 4-7 shows the coordinate axes, the positions where rotation starts (0°), and the directions of rotation of the evaluation board. The coordinate axes are defined as shown in Figure 4-7(a). The positions where rotation starts (0°) and its directions in obtaining the emission patterns in each plane are defined as shown in...

  • Page 50: Housing Design

    RX23W Group Guidelines for Bluetooth Board Design 4.9 Housing Design When this MCU is housed in a plastic housing, it is recommended that the distance between the main board and the plastic housing keep at least 1 mm away in order to ensure the characteristics of the antenna. At this time, keep at least 1 mm away from the top of the package only on the mounting surface of this MCU.

  • Page 51: Foot Pattern Design Example

    RX23W Group Guidelines for Bluetooth Board Design 4.10 Foot pattern design example There are two types of mounting pad; solder mask defined (SMD), in which the solder resist overlays the mounting pads, and non solder mask defined (NSMD), in which the solder resist does not overlay the pads.

  • Page 52: Revision History

    Revision History Description Rev. Date Page Summary 1.00 Nov.01.19 First edition issued  2.00 Jan.31.21 40 to 50 4.Board design guidelines for RX23W LGA, added 2.01 Sep.30.21 4.10 Foot pattern design example, added R01AN4534EJ0201 Rev.2.01 Page 52 of 52 Sep.30.21...
  • Page 53 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 54 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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