Wireless Module (DWM)
- 1 Specification
- 2 Pinout and detailed pin functions
- 3 Antenna connector
- 4 Integration guide
- 5 References
The module is built around an LS Research TiWi-BLE Integrated Transceiver Modules for WLAN 802.11 b/g/n and Bluetooth. The module implements the necessary PHY/MAC layers to support WLAN applications in conjunction with a host processor over a SDIO interface. The module also provides a Bluetooth platform through the HCI transport layer. Both WLAN and Bluetooth share the same antenna port.
- Based on Texas Instruments WL1271L Transceiver
- IEEE 802.11 b,g,n,d,e,i, compliant
- Bluetooth 2.1+EDR, Power Class 1.5
- Full support for BT4.0 BLE and ANT
- Reduced footprint: 25 mm x 38 mm
- Low height profile
- U.FL connector for external antenna
- Integrated band-pass filter
- Industrial operating temperature range: -40 / +85 °C
Please refer to the TiWi-BLE Datasheet for SDIO [WiFi] and UART [Bluetooth] interface timings.
Pinout and detailed pin functions
DWM can be connected to the host board through the J1 connector.
The following picture shows the reference pins of the J1 connector (placed on the bottom side of the DWM module):
J1 connector pinout table
The following table reports the connector pinout:
|3||BT_CTS||Input||Bluetooth HCI UART CTS||3.3V|
|4||WIFI_IRQ||Output||WLAN Interrupt Request||3.3V|
|5||BT_RX||Input||Bluetooth HCI UART RX||3.3V|
|6||BT_F2||Input||Bluetooth Wakeup||3.3V||Please leave unconnected if not used|
|7||BT_RTS||Output||Bluetooth HCI UART RTS||3.3V|
|8||WIFI_CLK_REQ(A)||Output||HOST_WakeUp||3.3V||Please leave unconnected if not used|
|9||BT_TX||Output||Bluetooth HCI UART TX||3.3V|
|10||NC||Reserved for future use||-||Please leave unconnected.|
|12||NC||Reserved for future use||-||Please leave unconnected.|
|13||DAT3||Input/Output||SDIO Data Bit 3||3.3V|
|14||NC||Reserved for future use||-||Please leave unconnected.|
|15||DAT2||Input/Output||SDIO Data Bit 2||3.3V|
|16||NC||Reserved for future use||-||Please leave unconnected.|
|17||DAT1||Input/Output||SDIO Data Bit 1||3.3V|
|18||NC||Reserved for future use||-||Please leave unconnected.|
|19||DAT0||Input/Output||SDIO Data Bit 0||3.3V|
|20||NC||Reserved for future use||-||Please leave unconnected.|
|23||SDO_CMD||Input/Output||SDIO Command Line||3.3V|
|27||3.3V||Power Input||+3.3V Input Voltage||3.3V|
|28||3.3V||Power Input||+3.3V Input Voltage||3.3V|
|29||5V||Power Input||+5V Input Voltage||5V|
|30||5V||Power Input||+5V Input Voltage||5V|
Connector part number
- on module: Molex 501920-3001
- on Carrier board: for example Molex 52991-0308 (dependon on stand-off chosen)
The following picture shows the position of the WiFi/Bluetooth antenna connector:
This section provides useful information and resources that let the system designer integrate the DWM module in the application very quickly.
The following picture shows the conceptual block diagram of the application where the host is an Embedded PC.
- 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
The following image shows the module dimensions:
The following images show the module layout:
The component view (top and bottom) is available as PDF file:
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.