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WT41 evaluation kit datasheet thursday, 04 august 2011 version 1.0
bluegiga technologies oy copyright ? 2000-2011 bl uegiga 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 fo r use as critical components in life support devices or systems. the wrap is a registered trademark 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.
bluegiga technologies oy version history version comment 1.0 release
bluegiga technologies oy table of contents WT41 evalua tion kit ........................................................................................................... ................................. 1 ? datasheet ..................................................................................................................... ....................................... 1 ? 1 ? design overview ............................................................................................................... ........................... 5 ? 2 ? schematics .................................................................................................................... ............................... 7 ? 3 ? assembly ...................................................................................................................... .............................. 10 ? 4 ? layout ........................................................................................................................ ................................. 11 ? 5 ? interfaces .................................................................................................................... ................................ 15 ? 5.1 ? powering the eval uation board ................................................................................................. ......... 15 ? 5.2 ? usb ............................................................................................................................... ..................... 15 ? 5.3 ? spi ........................................................................................................................... .......................... 16 ? 5.4 ? uart .......................................................................................................................... ....................... 16 ? 5.5 ? pcm codec and audi o interface ................................................................................................. ...... 16 ? 5.6 ? pio configurations and using the pio buttons ................................................................................. 16 ? 6 ? weee compliance ............................................................................................................... ...................... 17 ? 7 ? contact information ........................................................................................................... ......................... 18 ?
bluegiga technologies oy page 5 of 18 1 design overview WT41 evaluation kit is targeted for engineers evaluating WT41 bluetooth modules and developing or prototyping bluetooth systems utilizing WT41 module(s). WT41 evaluation kit features: ? evaluation board for WT41 bluetooth module containing o rs-232 serial interface o switchable self powered or bus powered usb interface o spi for upgrading the firmware and parameters o push buttons for all the pios and reset o pcm codec (winbond w681360sg) o 2 x 3,5mm audio jacks for microphone in and speaker out o 24 pin i/o interface (pio2 ? pio7, uart, pcm, gnd, 3v3) o current measurement point WT41 usb ldo dc ? in usb ? mode reset ? circuit i/o rs232 rs232 ? transceiver pcm ? codec audio spi buttons figure 1: block diagram of WT41 evaluation board please, refer to the latest WT41 data sheet for information about WT41 bluetooth module. the physical outlook, schematics, assembly and the pin configuratio ns of the interfaces of WT41 evaluation kit are described in this document.
bluegiga technologies oy page 6 of 18 WT41 evaluation kit is delivered with iwrap softw are as default firmware. iwrap is a simple ascii command based interface, which enables access to various bluetooth functions. a detailed description of iwrap can be found from iwrap user guide, which can be downloaded from the tech-forum. figure 2: WT41 evalution board
bluegiga technologies oy page 7 of 18 2 schematics figure 3: WT41 evaluation board schematic (1/3)
bluegiga technologies oy page 8 of 18 figure 4: WT41 evaluation board schematic (2/3)
bluegiga technologies oy page 9 of 18 figure 5: WT41 evaluation board schematic (3/3)
bluegiga technologies oy page 10 of 18 3 assembly figure 6: WT41 evaluation board assembly drawing
bluegiga technologies oy page 11 of 18 4 layout figure 7: top layer layout
bluegiga technologies oy page 12 of 18 figure 8: 2nd layer layout
bluegiga technologies oy page 13 of 18 figure 9: 3rd layer layout
bluegiga technologies oy page 14 of 18 figure 10: bottom layer layout
bluegiga technologies oy page 15 of 18 5 interfaces 5.1 powering the evaluation board the evaluation kit can be powered in three ways: 1. connect 5 v dc to j2. 100 ? 240 v ac to 5 v dc switching power supply is delivered with the evaluation kit. 2. connect 5 v dc to the header j3 or 3,3 v dc to at least one of the 24 pin header?s 3v3 pins 3. connect 5 v dc through the usb interface and set sw13 for bus-powered mode 5.2 usb WT41 can be configured to operate in a bus-powered or in a self powered mode. s ee the datasheet of WT41 and the hw design guide of WT41 for more detailed informat ion. in the evaluation board, the switch sw13 is used to define the hardware configuration. for the re lated software configuration use pstool software to set the required pskeys. relevant pskeys are: pskey name description pskey_host_interface set to 2 to enable hci-usb mode immediately at boot (otherwise refer to boot 3 command of iwrap firmware) pskey_host_interface_pio_usb set to 2 ? 7 to force the usb interface when that pio line is pulled high, overriding pskey_host_interface pskey_usb_max_power maximum current drawn by the device in units of 2 ma. this must be set for WT41 always since WT41 peak currents are over 100 ma pskey_usb_pio_vbus a values between 2 and 7 indicate the pio line to be used to monitor usb vbus. if key is not present then firmware assumes that usb vbus is always present. keep not present for bus-powered device. in the evaluation kit usb detection is connected to pio6. pskey_usb_attribute_power change to zero for bus-powered device pskey_usb_pio_pullup a va lues between 2 and 7 indicate the pio line to be used to enable and disable usb d+/d- pull-up resistor. setting to 16 enables the internal pull-up to be used for bus-powered device. in the evaluation pio2 is dedicated for usb pull-up resistor. table 1: usb configuration settings note: the evaluation kit is only for evaluation purpos es for the module and is not guaranteed to be 100% usb compliant. for example the power on led is always on when vdd is present and thus the kit will not meet the usb regulations for the suspend current. see the hw design guide for usb design considerations.
bluegiga technologies oy page 16 of 18 5.3 spi spi interface is connected to j9 and can be used for firmware and parameter updates 5.4 uart the uart interface is available through 3 mbps rs232 transceivers (max13235eeup) from j5. uart signals are also available in the header j6 which is connected directly to the pins of the module. uart transceiver can be disabled using sw1 and sw3. setting these to position off sets the transceivers to high impedance enabling the use of the signals through the header j6. 5.5 pcm codec and audio interface the audio interface is available through 3.5mm jack c onnectors. the pcm codec is a linear 13 bit w681360. 5.6 pio configurations and using the pio buttons all the pios are available on the push buttons. one shoul d however note that the pios are also used in other purposes in the board. following table shows the pio c onfigurations in the evaluat ion board and instructions for using the buttons pio line hw connection in the evaluation board switch position in order to use the button pio2 usb pull-up sw13 (usb mode) to position 1: self-powered pio3 uart dtr sw3 (disable dtr;dsr;cd) to position off pio4 uart cd sw3 (disable dtr;dsr;cd) to position off pio5 uart dsr sw3 (disable dtr;dsr;cd) to position off pio6 led through sw5 / usb detect sw5 to position 2 or 3 (pio6 to header) and sw13 (usb mode) to position 1: self-powered pio7 led through sw5 sw5 to position 3 (pio7 to header table 2: pio configurations
bluegiga technologies oy page 17 of 18 6 weee compliance the crossed-out wheeled bin means that within the european union the product must be taken to separate collection at the product end-of-life. do not dispose of these products as unsorted municipal waste.
bluegiga technologies oy page 18 of 18 7 contact information sales: sales@bluegiga.com technical support: support@bluegiga.com http://www.bluegiga.com/techforum/ orders : orders@bluegiga.com head office / finland: phone: +358-9-4355 060 fax: +358-9-4355 0660 street address: sinikalliontie 5a 02630 espoo finland postal address: p.o. box 120 02631 espoo finland sales office / usa: phone: (781) 556-1039 bluegiga technologies, inc. 99 derby street, suite 200 hingham, ma 02043

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