Silicon Laboratories WGM160P Hardware Design User Manual
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Silicon Laboratories WGM160P Hardware Design User Manual

Silicon Laboratories WGM160P Hardware Design User Manual

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UG384: WGM160P Hardware Design
User's Guide
The purpose of this guide is to help users design WiFi applications using the WGM160P.
This guide includes information for schematics and layout. Some options available with
WGM160P hardware are not available with all software architectures, so the pin features
versus software are detailed.
silabs.com | Building a more connected world.
KEY FEATURES
• Schematic guidelines
• Package information
• Layout guidelines
Rev. 0.3

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Summary of Contents for Silicon Laboratories WGM160P

  • Page 1 UG384: WGM160P Hardware Design User’s Guide The purpose of this guide is to help users design WiFi applications using the WGM160P. KEY FEATURES This guide includes information for schematics and layout. Some options available with WGM160P hardware are not available with all software architectures, so the pin features •...

  • Page 2: Table Of Contents

    Table of Contents 1. WGM160P Pinout ......3 2. WGM160P Pin Description ......4 2.1 Pin Table .

  • Page 3: Wgm160P Pinout

    UG384: WGM160P Hardware Design User’s Guide WGM160P Pinout 1. WGM160P Pinout WGM160P is a 23.8 mm x 14.2 mm x 2.3 mm PCB module. The diagram below describes pinout (top view) Figure 1.1. WGM160P Device Pinout silabs.com | Building a more connected world.

  • Page 4: Wgm160P Pin Description

    UG384: WGM160P Hardware Design User’s Guide WGM160P Pin Description 2. WGM160P Pin Description 2.1 Pin Table Table 2.1. WGM160P Device Pinout Pin Name Pin(s) Description Pin Name Pin(s) Description External antenna connection for diversi- ty antenna. Terminate to ground with ANT_GND Antenna ground.

  • Page 5: Power Pin

    Note that pin VBUS cannot be used to supply the module. 2.3 RESETn Pin The WGM160P module is reset by driving the RESETn pin low. A weak internal pull-up resistor holds the RESETn pin high allowing it to be left unconnected if no external reset source is required.

  • Page 6: Clocks

    DTIM modes is optimized when using the WGM160P with an integrated 32.768 kHz crystal. For WGM160P applications requiring Ethernet, a 50 MHz reference clock is required. This can be achieved either by connecting a 50 MHz external clock to module pin PB14 or by connecting a 50 MHz crystal oscillator between pins PB13 (HFXTAL_P) and PB14 (HFXTAL_N).

  • Page 7: Pta Pins

    2.6 PTA Pins If an RF transceiver using the same 2.4 GHz band (e.g. Bluetooth) is located next to WGM160P, a Packet Transfer Arbitration (PTA) interface can be used to avoid mutual interference. In this case, the PTA pins are connected to the other transceiver. The PTA interface is highly programmable and can use 1, 2, 3, or 4 pins upon configuration.
  • Page 8 The following table provides details on the various multifunction pin features supported through Gecko OS 4.0. Features such as SPI slave and USB will be supported in future releases of the Gecko OS. Table 2.6. WGM160P Multifunction Pin Configuration With GeckoOS GPIO...
  • Page 9 5. WGM160P PAD 35 is used as factory reset pin and resets all Gecko OS variables to defaults. Any of the spare GPIOs is expec- ted to be configured as factory reset pin, default being GOS_GPIO_16. More about factory reset at https://docs.silabs.com/gecko-...

  • Page 10: Application Schematic Recommendations

    3.2 RF Part When using the WGM160P with an antenna external to the module, be they connectorized off-the-shelf antennas or PCB trace anten- nas, antenna impedance must be well matched to 50 Ω, achieving better than -10 dB return loss throughout the 2.4-2.48 GHz band to reduce distortion in the module power amplifier due to impedance mismatch.

  • Page 11: Typical Application Schematics

    UG384: WGM160P Hardware Design User’s Guide Typical Application Schematics 4. Typical Application Schematics The diagrams below show a simple application schematic with WGM160P and its internal antenna. Figure 4.1. WFM160PX22KGA2 Schematics silabs.com | Building a more connected world. Rev. 0.3 | 11...

  • Page 12: Layout Recommendations

    UG384: WGM160P Hardware Design User’s Guide Layout Recommendations 5. Layout Recommendations 5.1 Generic RF Layout Considerations For custom designs, use the same number of PCB layers as are present in the reference design whenever possible. Deviation from the reference PCB layer count can cause different PCB parasitic capacitances, which can detune the matching network from its optimal form.

  • Page 13: Rf-Pads Including The Diversity Port And External Antennas

    5.2 RF-Pads Including the Diversity Port and External Antennas With WGM160P variants without a chip antenna, the important properties are mainly to ensure that WGM160P ground pads are well connected to the PCB ground plane in order to optimize thermal conductivity and prevent unwanted emissions due to ground currents.

  • Page 14: Module Chip Antenna

    As is common for very small antennas, the antenna on WGM160P uses the ground plane edge to radiate, rather than just the antenna chip itself. The antenna on WGM160P is robust to the detuning effect of the proximity of various objects and makes the module easy to use with a consistent and reliable performance.
  • Page 15 UG384: WGM160P Hardware Design User’s Guide Layout Recommendations Figure 5.3. Details of Antenna Ground Clearance Figure 5.4. Details about Board Dimensions and Module Placement Any metallic objects in close proximity to the antenna will distort the antenna's electromagnetic fields and cause the antenna center frequency to shift, reducing performance.
  • Page 16 Narrower ground planes can be used but will result in compromised RF performance. The following two-dimensional radiation pattern plots have been measured on the BRD4321A board: Figure 5.6. WGM160P Radio Board BRD4321A with XYZ Axis Added silabs.com | Building a more connected world.
  • Page 17 UG384: WGM160P Hardware Design User’s Guide Layout Recommendations Figure 5.7. Typical 2D Radiation Pattern—Top View silabs.com | Building a more connected world. Rev. 0.3 | 17...
  • Page 18 UG384: WGM160P Hardware Design User’s Guide Layout Recommendations Figure 5.8. Typical 2D Radiation Pattern—Front View silabs.com | Building a more connected world. Rev. 0.3 | 18...
  • Page 19 UG384: WGM160P Hardware Design User’s Guide Layout Recommendations Figure 5.9. Typical 2D Radiation Pattern—Side View silabs.com | Building a more connected world. Rev. 0.3 | 19...

  • Page 20: Recommendations For Certification

    UG384: WGM160P Hardware Design User’s Guide Recommendations for Certification 6. Recommendations for Certification Customers should refer to the datasheet for detailed recommendations about certification. silabs.com | Building a more connected world. Rev. 0.3 | 20...

  • Page 21: Package Outline

    UG384: WGM160P Hardware Design User’s Guide Package Outline 7. Package Outline Figure 7.1. WGM160PX22KGA2 Package Outline silabs.com | Building a more connected world. Rev. 0.3 | 21...

  • Page 22: Recommended Pcb Land Pattern

    Recommended PCB Land Pattern 8. Recommended PCB Land Pattern Figure 8.1. WGM160PX22KGA2/ WGM160P022KGA2 Recommended Land Footprint For WGM160P modules without antenna, there is no need for PCB antenna clearance. silabs.com | Building a more connected world. Rev. 0.3 | 22...
  • Page 23 UG384: WGM160P Hardware Design User’s Guide Recommended PCB Land Pattern Figure 8.2. WGM160PX22KGN2/ WGM160P022KGN2 Recommended Land Footprint silabs.com | Building a more connected world. Rev. 0.3 | 23...
  • Page 24 Trademark Information Silicon Laboratories Inc.® , Silicon Laboratories®, Silicon Labs®, SiLabs® and the Silicon Labs logo®, Bluegiga®, Bluegiga Logo®, Clockbuilder®, CMEMS®, DSPLL®, EFM®, EFM32®, EFR, Ember®, Energy Micro, Energy Micro logo and combinations thereof, "the world’s most energy friendly microcontrollers", Ember®, EZLink®, EZRadio®, EZRadioPRO®, Gecko®, Gecko OS, Gecko OS Studio, ISOmodem®, Precision32®, ProSLIC®, Simplicity Studio®, SiPHY®, Telegesis, the Telegesis Logo®, USBXpress®...

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