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===Electrical guidelines===
*xxxxxxxxxx Keep SDIO lines**50ohm single ended impedance**keep lines as short as possible.*xxxxxxxxxx *place series resistor on the carrier for impedance matching (tipical 22ohm)*5V and 3.3V rails can power up in any order*xxxxxxxxxx Keep *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 operationsAsk more information to [https://www.dave.eu/helpdesk technical support] about this topic.
==Calibration process==
The radio interface of the DWS module is configured by several parameters. These parameters are set through a calibration processin Linux user space. ==== Regulatory domain ====For proper operation in the country where the system is deployed, that is described in detail xxxxxxxxxxxxxxxthe regulatory domain has to be configured. See [[DWS ADD-ON/Regulatory domain setup|this section]] for more details
==== MAC address ====
The MAC address is set at calibration time for WLANfused 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. xxxxxxxxxx
===Tested Antennas===
Following a list of tested and approved antennas:
* Laird technology 001-0001 with UFL to SMA adapter [[File:001-0001.png|thumb|100px135x135px|none| Laird Connectivity 001-0001 ]] [[File:1300-00041.png|thumb|100px135x135px|none| UFL to SMA adapter ]]*J2 Antennas 2JF0102P patch antenna[[File:2jf0102p-01.jpg|left|thumb|135x135px|J2 Antennas 2JF0102P]]
*
{{ImportantMessage|text=Molex 47950-0011 valid only for '''No EU''' countries - see [https://www.lairdconnect.com/documentation/regulatory-information-tiwi-ble link][[File:4795.png|thumb|100px|none]] }}
