DWM ADD-ON/DWM Hardware/Integration guide

History
Version	Issue Date	Notes
1.0.0	Nov 2020	New documentation layout

Integration guide

This section provides useful information and resources that let the system designer integrate the DWM module in the application very quickly.

Typical scenario

The following picture shows the conceptual block diagram of the application where the host is an Embedded PC.

Typical scenario

Real case scenario on AXEL Lite SOM Evaluation Kit

Electrical guidelines

• Keep SDIO lines as short as possible.
• 5V and 3.3V rails can power up in any order
• Keep WIFI_EN asserted during power-up sequence

Calibration process

The radio interface of the DWM module is configured by several parameters. These parameters are set through a calibration process, that is described in detail here.

The calibration process—that produces an NVS file—is not trivial. Apart from the chip itself (Texas Instruments WL1271L in this case), it depends on:

• the antenna
• the firmware version downloaded to the chip
• the initialization data, typically stored in an INI file.

The following links refer to specific use cases, where the resulting NVS file is provided along with DAVE Embedded Systems products integrating DWM module.

• SBC Lynx (XUELK)
• SBC Lynx (Debian)

Tested Antennas

Following a list of tested and approved antennas:

• Laird technology 001-0001 with UFL to SMA adapter
  
  
• Molex 47950-0011
  

References

• WL127x Main page
• WL127x WLAN API
• Calibration Process
• TiWi-BLE Downloads
• INI Guide
• Antenna Design
• EMC Guide
• Linux Calibrator

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