DWS ADD-ON/DWS Hardware/pdf

General Information

DWS TOP View

DWS TOP View

DWS BOTTOM View

DWS BOTTOM View

Introduction

The module is built around a Telit WE866C6-P Dual Band (2.4GHz and 5GHz) 802.11 ac WiFi and Bluetooth 5 module. The module implements the necessary PHY/MAC layers to support WLAN applications in conjunction with a host processor over a SDIO interface. The module provides a Bluetooth platform through the HCI transport layer. Both WLAN and Bluetooth share the same antenna port.

Features

• Based on Telit WE866C6-P
• Wi-Fi - 802.11 a/b/g/n/ac (dual band 2.4GHz and 5GHz)
• Bluetooth BLE 5 with low energy (LE) support
• Reduced footprint: 25 mm x 38 mm
• Low height profile
• U.FL connector for external antenna
• Integrated LTE-Wi-Fi/BLE coexistence filter
• Additional PCM interface for BT Audio (optional)
• Industrial operating temperature range: -40 / +85 °C

Interface timings

Please refer to the WE866C6-P Datasheet for SDIO 3.0 [WiFi] and UART [Bluetooth] interface timings.

Hardware versioning and tracking

DWS SOM implements well established versioning and tracking mechanisms:

• PCB version is copper printed on PCB itself, as shown in Fig. 1
• serial number: it is printed on a white label, as shown in Fig. 2: see also Product serial number page for more details

Fig.1 PCB version

Fig.2 Serial number

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Part number composition

DWS ADD-ON part number is identified by the following digit-code table:

Part number structure	Options	Description
Family	DWS	Family prefix code
Chipset	0: Telit WE866C6
RFU	0: default	Reserved for future use
RFU	0: default	Reserved for future use
Form factor	0: Narrow
Temperature range	I - Industrial	For the DAVE Embedded Systems' product Temperature Range classification, please find more information at the page Products Classification
PCB revision	0: first version	PCB release may change for manufacturing purposes (i.e. text fixture adaptation)
Manufacturing option	R: RoHS compliant	typically connected to production process and quality
Software Configuration	-00: default configuration	If customers require custom SW deployed this section should be defined and agreed

Example

DWS ADD-ON code DWS0000I0R-00

• DWS - DWS ADD-ON
• 0 - WE866C6 chipset
• 000 - standard version
• I - Industrial temperature range (i.e. -40 to 85°C)
• 0 - First PCB revision
• R - RoHS manufacturing process
• -00 default

Pinout Table

Connectors and Pinout Table

Connectors description

In the following table are described all available connectors integrated on DWS_ADD-ON:

Connector name	Connector Type	Notes	Carrier board counterpart
J1	Dual in line low profile high density connector 30pins	Molex 501920-3001	Molex 52991-030, others are available with different stand-off
Antenna's connector	UFL type	N.A.	UFL cable side (many versions available in the market already inserted on cables/antenna patches)

The dedicated carrier board must mount the mating connector and connect the desired peripheral interfaces according to DWS pinout specifications. See the images below for reference:

DWS TOP view with antenna's connector

DWS BOTTOM view with main connector

Pinout table naming conventions

This chapter contains the pinout description of the DWS module, grouped in two tables (odd and even pins) that report the pin mapping of the TBD: connector type DWS connector.

Each row in the pinout tables contains the following information:

Pin	Reference to the connector pin
Pin Name	Pin (signal) name on the DWS connectors
Internal connections	Connections to the DWS components BT_<x> : pin connected UART bus (Bluetooth) SDIO_<x> : pin connected to the SDIO bus (WiFi)
Ball/pin #	Component ball/pin number connected to signal
Voltage	I/O voltage levels
Type	Pin type: I = Input O = Output D = Differential Z = High impedance S = Power supply voltage G = Ground A = Analog signal
Notes	Remarks on special pin characteristics
Pin MUX alternative functions	Muxes: Pin ALT-0 ... Pin ALT-N The number of functions depends on platform

Pinout Table ODD pins declaration

Pin	Pin Name	Internal Connections	Ball/pin #	Voltage domain	Type	Notes	Pin MUX alternative functions
J1.1	BT_EN	Bluetooth Enable		3.3V	I
J1.3	BT_CTS	Bluetooth HCI UART CTS		3.3V	I
J1.5	BT_RX	Bluetooth HCI UART RX		3.3V	I
J1.7	BT_RTS	Bluetooth HCI UART RTS		3.3V	O
J1.9	BT_TX	Bluetooth HCI UART TX		3.3V	O
J1.11	DGND	Ground		-	G
J1.13	SDIO_DAT3	SDIO Data Bit 3		3.3V	I/O
J1.15	SDIO_DAT2	SDIO Data Bit 2		3.3V	I/O
J1.17	SDIO_DAT1	SDIO Data Bit 1		3.3V	I/O
J1.19	SDIO_DAT0	SDIO Data Bit 0		3.3V	I/O
J1.21	DGND	Ground		-	G
J1.23	SDIO_CMD	SDIO Command Line		3.3V	I/O
J1.25	DGND	Ground		-	G
J1.27	3.3V	+3.3V Input Voltage		3.3V	S
J1.29	5V	+5V Input Voltage		5V	S	Not used on default mounting option

Pinout Table EVEN pins declaration

Pin	Pin Name	Internal Connections	Ball/pin #	Voltage domain	Type	Note	Pin MUX alternative functions
J1.2	WIFI_EN	WLAN Enable		3.3V	I
J1.4	WIFI_IRQ	WOW (Wake On Wireless)		3.3V	O	Open drain output with internal pull-up Do Not Connect on the carrier board (this feature is not supported yet)
J1.6	BT_F2	Reserved for future use		-		Do Not Connect on the carrier board
J1.8	WIFI_CLK_REQ(A)	Reserved for future use		-		Do Not Connect on the carrier board
J1.10	NC	Reserved for future use		-		Do Not Connect on the carrier board
J1.12	NC	Reserved for future use		-		Do Not Connect on the carrier board
J1.14	AUDIO_I2S_SDO	Reserved for future use		-		Do Not Connect on the carrier board
J1.16	AUDIO_I2S_SCK	Reserved for future use		-		Do Not Connect on the carrier board
J1.18	AUDIO_I2S_WS	Reserved for future use		-		Do Not Connect on the carrier board
J1.20	AUDIO_I2S_SDI	Reserved for future use		-		Do Not Connect on the carrier board
J1.22	DGND	Ground		-	G
J1.24	SDIO_CLK	SDIO Clock		3.3V	I
J1.26	DGND	Ground		-	G
J1.28	3.3V	+3.3V Input Voltage		3.3V	S
J1.30	5V	+5V Input Voltage		5V	S	Not connected/used on default mounting option

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Integration guide

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

Electrical, Thermal and Mechanical Features

Operational characteristics

Maximum ratings

Parameter	Min	Typ	Max	Unit
3.3V power supply voltage	-0.3	3.3	3.65	V
5V power supply voltage	-0.3	5	6.5	V

Recommended ratings

Parameter	Min	Typ	Max	Unit
3.3V power supply voltage	3.135	3.3	3.46	V
5V power supply voltage	3.525	5	6	V

By default 5V power supply voltage is not used inside the add-on, see integration guide for more informations.

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Mechanical specifications

This chapter describes the mechanical characteristics of the DWS module.

Board Layout

The following figure shows the physical dimensions of the DWS module:

Connectors

The following figure shows the DWS connector layout:

CAD drawings

• Component view (PDF)
• DXF (2D) file
• step (3D) file