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DKWF121 – WF121-A 802.11 B/G/N
MODULE EVALUATION BOARD
PRELIMINARY DATA SHEET
Wednesday, 16 May 2012
Version 0.5
Copyright © 2000-2012 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
0.1
First draft
0.2
Restructured, added schematics and board drawing
0.3
Schematics redraw according to board corrections
0.4
Added note about USB current limit, made a small schematic correction
0.5
Updated product information, added image, ordering codes
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TABLE OF CONTENTS
1
Product description ........................................................................................................................................5
2
Ordering Information......................................................................................................................................6
3
Board Description ..........................................................................................................................................7
3.1
WiFi Module ..........................................................................................................................................7
3.2
Crystals .................................................................................................................................................7
3.3
Configurable I/O Ports ..........................................................................................................................7
3.4
Bluetooth Coexistence ..........................................................................................................................8
3.5
LEDs and Buttons .................................................................................................................................8
3.6
USB Connections .................................................................................................................................9
3.7
Board Power ...................................................................................................................................... 10
3.8
Current Measurement Point J13 ........................................................................................................ 10
3.9
VDD_PA Selection Header J7 ........................................................................................................... 10
3.10
Ethernet ............................................................................................................................................. 11
3.11
Programming Connections ................................................................................................................ 11
3.12
Debug SPI Interface .......................................................................................................................... 12
3.13
Prototyping Area ................................................................................................................................ 12
4
Board layout ............................................................................................................................................... 13
5
Contact Information .................................................................................................................................... 14
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1
Product description
DESCRIPTION
KEY FEATURES:
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.
-USB or UART host connection
-USB converter for the UART
-Can be powered through USB
-Current measurement voltage output
-Prototyping area
PHYSICAL OUTLOOK:
The WF121 is a self-contained Wi-Fi module
providing a fully integrated 2.4GHz 802.11 b/g/n
radio and a 32-bit microcontroller (MCU)
platform, making it an ideal product for
embedded applications requiring simple, lowcost
and
low-power
wireless
TCP/IP
connectivity. WF121 also provides flexible
interfaces for connecting to various peripherals.
WF121 allows end user applications to be
embedded
onto
the
on-board
32-bit
microcontroller using a simple Bluegiga
TM
BGScript scripting language. This cuts out the
need of an external MCU and allows the
development of smaller and lower-cost
products. However WF121 can also be used in
modem-like mode in applications where the
external MCU is needed.
With an integrated 802.11 radio, antenna, single
power supply, and regulatory certifications,
WF121 provides a low-risk and fast time-tomarket for applications requiring Wi-Fi
connectivity. This combined with Bluegiga’s
excellent customer service will turn your
Internet-of-Things applications into reality.
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2
Ordering Information
Product code
Description
WF121-A-G
WF121-A, global RF settings
WF121-E-G
WF121-E, global RF settings
WF121-N-G
WF121-N, global RF settings (MoQ: 5000)
DKWF121
WF121 development kit
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3
3.1
Board Description
WiFi Module
DKWF121 contains a WF121-A module variant, with an internal chip antenna.
3.2
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.
3.3
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.
3.4
Bluetooth Coexistence
Industry standard 2-wire and 3-wire, as well as Unity-3, Unity-4, Unity-3e coexistence schemes are supported
as well as the Unity+ -extension, 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 or 3e+ scheme.
3.5
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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3.6
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 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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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.
3.7
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.
3.8
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.
3.9
VDD_PA Selection Header J7
WF121 has two power supply inputs, VDD_3.3V (VDD_3.3V_MOD line on the schematic) and VDD_PA. The
VDD_3.3V pad supplies the internal processor and has a voltage range of 2.3V to 3.6V. The VDD_PA pad
supplies the internal WiFi-circuitry through a switch mode converter and the WiFi power amplifier directly. The
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VDD_PA line can operate with input voltages between 2.7V and 5.5V, though the power consumption of the
power amplifier will grow in direct proportion to the input voltage. The separate supply however allows direct
connection to a lithium-ion battery, with just a small linear regulator limiting the supply voltage for the
processor side.
A jumper at header J7 usually connects VDD_PA to the board 3.3V switch mode converter output. The jumper
can be moved to the alternate position to supply the VDD_PA line directly from the 5V supply rail, for example
for connecting directly to a lithium battery either through the power input header or through the prototyping
area connections.
3.10
Ethernet
The board contains a 10/100Mbps Ethernet PHY with all the associated components, connected to the
module internal Ethernet MAC with an RMII interface. The PHY can be fully powered off and disconnected
from the GPIO lines using switch SW1, allowing the GPIO lines to be used for other functions. The Ethernet
interface is not yet supported by the Bluegiga software.
3.11
Programming Connections
DKWF121 contains two connectors that allow direct programming of the WF121 internal processor. The
Microchip proprietary ICSP bus allows programming the full firmware image using a Microchip or third party
programming adapter. The pin header installed on the DKWF121 has a pinout suitable for use with the low-
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cost PicKit3 programming tool from Microchip. A JTAG connection is also available for basic boundary scans
and device programming. The JTAG does not support full device testing and debugging.
The primary means of uploading application data is through a host connection through the Bluegiga boot
loader. The programming connections should not be needed unless the internal boot loader is overwritten by
the application.
3.12
Debug SPI Interface
A header is provided for the module debug bus for certification RF testing. Access to internal settings and test
modes is available using a CSR compatible SPI adapter and UniTest-software.
For more information contact Bluegiga technical support.
3.13
Prototyping Area
DKWF121 contains an array of through plated holes with wide pads with a 2.54mm raster for easy addition of
carrier boards, through-hole components and pin headers with a custom pinout. Also present is a smaller
array of pads with no holes using 1.27m raster for connecting SMD components like sensors, regulators etc
during system development.
All GPIO signals are routed to the prototyping area edges, though some of them are not by default connected
due to function multiplexing. See other chapters for detailed descriptions of these signals.
Also present on the pin headers and pads around the prototyping area are several supply voltage rails present
on the board. These can be used for powering external circuitry, or for powering the module with external
power sources. The uppermost and lowest rows of pads are connected to ground.
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4
Board layout
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5
Contact Information
Sales:
[email protected]
Technical support:
[email protected]
http://techforum.bluegiga.com
Orders:
[email protected]
WWW:
www.bluegiga.com
www.bluegiga.hk
Head Office / Finland:
Phone: +358-9-4355 060
Fax: +358-9-4355 0660
Sinikalliontie 5A
02630 ESPOO
FINLAND
Postal address / Finland:
P.O. BOX 120
02631 ESPOO
FINLAND
Sales Office / USA:
Phone: +1 770 291 2181
Fax: +1 770 291 2183
Bluegiga Technologies, Inc.
3235 Satellite Boulevard, Building 400, Suite 300
Duluth, GA, 30096, USA
Sales Office / Hong-Kong:
Phone: +852 3182 7321
Fax: +852 3972 5777
Bluegiga Technologies, Inc.
19/F Silver Fortune Plaza, 1 Wellington Street,
Central Hong Kong
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