DKWF121

DKWF121 Datasheet


DKWF121 WF121-A B/G/N MODULE EVALUATION BOARD

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DKWF121 WF121-A B/G/N MODULE EVALUATION BOARD

DATA SHEET

Thursday, 24 July 2014 Version

Copyright 2000-2014 Bluegiga Technologies

All rights reserved. Bluegiga Technologies assumes no responsibility for any errors which may appear in this manual. Furthermore, Bluegiga Technologies reserves the right to alter the hardware, software, and/or specifications detailed here at any time without notice and does not make any commitment to update the information contained here. Bluegiga’s products are not authorized for use as critical components in life support devices or systems. The WRAP, Bluegiga Access Server, Access Point and iWRAP are registered trademarks of Bluegiga Technologies. The Bluetooth trademark is owned by the Bluetooth SIG Inc., USA and is licensed to Bluegiga Technologies. All other trademarks listed herein are owned by their respective owners.

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VERSION HISTORY Version

Comment

First version Updated Ethernet section, various small edits elsewhere

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TABLE OF CONTENTS
1 Product 2 Ordering 3 Board Description

Wi-Fi Crystals Configurable I/O Ports Bluetooth Coexistence LEDs and Buttons USB Connections Board Power 10 Current Measurement Point 10 VDD_PA Selection Header J7 11 Ethernet 11 Programming Connections 12 Debug SPI Interface 12 Prototyping Area 12 4 Board layout 13 5 Contact Information 14

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1 Product description

DKWF121 is intended for evaluating the WF121 Wi-Fi module and as a basis for product development. The board contains connectors for easy development with a PC using the main host connections, USB and UART through a USB converter. Also present are headers for all the GPIO pads connected around a prototyping area for easy connection of pin headers with custom pinouts, sensors etc.

Bluegiga WF121 is a stand-alone Wi-Fi module providing fully integrated 2.4GHz b/g/n radio, TCP/IP stack and a 32-bit micro controller MCU platform for embedded applications requiring simple, low-cost and lowpower wireless IP connectivity. WF121 also provides flexible peripheral interfaces such as SPI, I2C, ADC, GPIO, Bluetooth coexistence and timers to connect various peripheral interfaces directly to the WF121 WiFi module.

WF121 Wi-Fi module also allows end user applications to be embedded onto the on-board 32-bit MCU using a simple Bluegiga BGScriptTM scripting language and free-ofcharge development tools. This cuts out the need of and additional MCU and enables end users to develop smaller and lower cost Wi-Fi devices. WF121 can also be used in modemlike mode in applications where the external MCU is needed. The access point and server functionality is also included for the easy configurations and direct connections with phones, tablets and PC's.

With an integrated radio, antenna, single power supply, and CE, FCC and IC regulatory certifications, WF121 provides a low-risk and fast time-to-market for applications requiring WiFi connectivity.

KEY FEATURES:
• USB or UART host connection
• USB converter for the UART
• Can be powered through USB
• Ethernet connection
• Current measurement voltage output
• Prototyping area

PHYSICAL OUTLOOK:

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2 Ordering Information

Product code

WF121-A-v2 WF121-E-v2 DKWF121

WF121 Wi-Fi Module with internal chip antenna WF121 Wi-Fi Module with U.FL connector WF121 development kit

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3 Board Description

Wi-Fi Module

DKWF121 contains a WF121-A module variant, with an internal chip antenna.

Crystals

There are two crystals assembled on DKWF121, an 8MHz crystal for the WF121 CPU clocking and a 32.768kHz crystal for the CPU real time clock. The 8MHz crystal is needed when the WF121 USB connection is used, otherwise it is not essential. The 32kHz crystal is also optional, and if extra GPIO are needed, the 0ohm resistors connecting the crystals to the module can be removed and moved to connect the pin headers and prototyping area pads to the module pads. The pads are not connected to the pin headers by default as crystal connections are always sensitive to noise.

Configurable I/O Ports

All the GPIO pads available on the WF121 are routed to pin headers for easy connection to other boards or a logic analyzer. All the signals are also available on through-hole pads on the edges of the board prototyping area for easy development prototyping.

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The GPIO signals associated with the crystals are routed but not connected due to the presence of the crystals, but if required the crystals can be removed and the associated 0ohm resistors moved to connect the signals to the headers. The signals shared for other functions like the ICSP programming interface, JTAG, UART’s and Ethernet should not be driven by externally connected outputs when the mentioned functions are used to avoid damage. The UART and Ethernet signals are disconnected when the associated on-board chips are disabled with the on-board switches. The USB pins are by default disconnected from the pin headers, but can be connected by adding two jumpers to the specific header.

Bluetooth Coexistence

Industry standard 2-wire and 3-wire, as well as Unity-3, Unity-4, Unity-3e coexistence schemes are supported and the associated signals are available. The PIO pads can be configured for these functions among others. A U.FL connector is also present for antenna sharing using the module internal RF switch. As only 4 GPIO signals can be used for coexistence, antenna sharing in practice requires the use of the CSR proprietary Unity-3e scheme.

LEDs and Buttons

There are five LEDs and five pushbuttons on the DKWF121. One button is for module reset and one LED indicates that the module has a power supply present, while the other four LEDs and buttons are available for development purposes. The LEDs are buffered with MOSFETs and the buttons are open when unpressed, allowing the connected GPIO lines to be used for other purposes without disconnecting the LEDs or buttons.

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USB Connections

DKWF121 contains a microUSB connector for use with USB host connection, and a separate microUSB connector with associated high speed USB-to-UART converter for UART host connection development with a PC. The converter chip is a common dual-port FTDI type that will automatically register as a virtual serial port in most operating systems with either inbuilt or automatically installed drivers.

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The USB host connection includes a MOSFET power switch to allow host-mode operation with the DKWF121 feeding power to the external device. However, the current firmware does not support USB host mode.

No separate connectors for SPI host connections are provided as there is no standard connector or pinout, but the signals are available on the pin headers and pads on the prototyping area edge for easy soldering of a connector with a custom pinout.

Board Power

DKWF121 can be powered by several sources.
• Both USB connectors can be used as the power supply input
• A two-pin header
• The signal pin headers and prototyping area connections have power connections

Note if the on-board WF121 module does not contain firmware that operates the native USB connection, the module cannot request an increase to the USB default current limit of 100mA. Although not all USB host systems implement it, the USB specification states that the host should limit the current output to 100mA unless an increase is requested, and using the module with high transmit duty cycles may cause the USB host to go into current limit, possibly causing the module to crash. It is preferred to power the board through the USB/UART-converter connector, the converter chip will automatically request for an increased current limit.

The board contains a switch mode converter that converts the 5V input to the 3.3V supply required by the module. The converter is specified for output currents up to 600mA, allowing up to 200mA to be drawn for powering customer applications.

The module operates down to 2.7V, but the current measure output and USB host functionality require a regulated 5V input. The header and the USB connectors also have series schottky diodes, increasing the minimum input voltage slightly. The 5V power connections in the prototyping area and the associated pin headers do not have series diodes. The diodes allow connection of a USB host together with a separate power supply without risk of damage.

Current Measurement Point J13

Header J13 contains a jumper that connects the switch mode regulator to the module 3.3V supply pads. The jumper can be removed and the average current consumption of the module can be measured with a multimeter or a series resistor can be inserted for measuring the momentary current consumption of the module with an oscilloscope. Note that for average consumption measurement of anything else besides sleep current a fast RMS multimeter is needed due to the pulsed nature of the consumption.

Removing the jumper also allows separation of the module supply lines from the regulator output, for example when using an external regulator to supply the 3.3V voltage to the module is desired.

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Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived DKWF121 Datasheet file may be downloaded here without warranties.

Datasheet ID: DKWF121 521935