DWS ADD-ON/DWS Hardware/Integration guide

History
Issue Date	Notes
2022/01/19	First version

Integration guide

This section provides useful information and resources that let the system designer integrate the DWS 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 System.

Typical Embedded scenario

Real case scenario on AXEL Lite SOM Evaluation Kit

Electrical guidelines

• SDIO lines
  • 50ohm single ended impedance
  • keep lines as short as possible
  • place series resistor on the carrier for impedance matching (tipical 22ohm)
• 5V and 3.3V rails can power up in any order
  • by default 5V rail is not used by the add-on
• keep WIFI_EN asserted during power-up sequence

Customizations

Many customization are potentially available for this module:

• I/O with 1.8V levels
  • applies to all the interfaces (SDIO, UART, EN)
• the module can be powered by the 5V rail only
• I2S interface can be made available for BT operations

Ask more information to technical support about this topic.

Calibration process

The radio interface of the DWS module is configured by several parameters. These parameters are set in Linux user space.

Regulatory domain

For proper operation in the country where the system is deployed, the regulatory domain has to be configured. See this section for more details

MAC address

The MAC address is fused inside the module and assured to be unique

Antenna selection

The WiFi module featured inside this add-on provides some precertifications that allow the final customer to decrease the amount of test to perform to obtain the needed certification.

To be able to use these precertifications a proper antenna has to be selected. Refer to the manufacturer Hardware Design Guide, linked in the References section of this page, or contact technical support for more informations.

Tested Antennas

Following a list of tested and approved antennas:

1. Atel T-AT9552 with UFL to SMA adapter:
   

   Atel T-AT9552
   

   UFL to SMA adapter
2. J2 Antennas 2JF0102P patch antenna
   

   J2 Antennas 2JF0102P

The antenna 1. has been used by the manufacturer for the precertification tests

The antenna 2. has been used by DAVE for the qualification tests

References

• WE866C6-P Wi-Fi module manufacturer's documentation page
  • see the Hardware Design Guide for the antenna selection
  • see the Wi-Fi and Bluetooth Network Interface Card NIC User Guide for software implementations