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wt1 1 i - a data sheet monday, 09 september 2013 version 1. 60
bluegiga technologies oy copyright ? 2000 - 2013 bluegiga technologies all rights reserved. bluegiga technologies assumes no responsibility for any errors which may appear in this manual. furthermore, bluegiga technolo gies 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. bluegigas products are not authorized for use as critical co mponents 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 1.1 fcc radiation exposure statement updated 1.2 fcc and ic statements updated, physical dimensions added 1.3 wt11i description updated 1.4 wt11i - e removed 1.41 ic statement in french added 1.42 table 1: reset description corrected 1.43 contact details updated 1.44 terminal descriptions corrected , recommended pcb land pattern added , layout recommendations updated 1.45 current consumption, antenna characteristics 1.46 package dimensions added 1.47 tolerance for the external dimensions 1.48 figure 9. tolerances updated. 1.49 page 38: reset is active high 1.5 current consumption corrected 1.51 tx power vs supply voltage and power control steps added 1.52 fcc certification notice updated 1.53 external dimensions 1.54 pin no. 1 indicator in the pcn land pattern 1.55 peak current consumption corrected from 170 ma to 180 ma 1.56 mic japan information updated 1.57 fcc/ic sar requirement
bluegiga technologies oy 1.58 mic japan id corrected 1.59 mi nor updates to the spi interface description
bluegiga technologies oy table of contents 1 ordering information ................................ ................................ ................................ ......................... 8 2 pinout and terminal description ................................ ................................ ................................ ................... 9 3 electrical chara cteristics ................................ ................................ ................................ ............................ 12 3.1 absolute maximum ratings ................................ ................................ ................................ ................ 12 3.2 recommended operating conditions ................................ ................................ ................................ . 12 3.3 current consumption ................................ ................................ ................................ .......................... 12 3.4 pio current sink and sou rce capability ................................ ................................ ............................. 13 3.5 radio characteristics ................................ ................................ ................................ .......................... 13 3.6 antenna specification ................................ ................................ ................................ ......................... 15 4 physical dimensions ................................ ................................ ................................ ................................ .. 18 4.1 package drawings ................................ ................................ ................................ .............................. 19 5 layout guidelines ................................ ................................ ................................ ................................ ....... 21 6 uart interface ................................ ................................ ................................ ................................ ........... 24 6.1 uart bypass ................................ ................................ ................................ ................................ ...... 26 6.2 uart configuration while reset is active ................................ ................................ ......................... 26 6.3 ua rt bypass mode ................................ ................................ ................................ ............................ 26 7 usb interface ................................ ................................ ................................ ................................ ............. 27 7.1 usb data connections ................................ ................................ ................................ ....................... 27 7.2 usb pull - up resistor ................................ ................................ ................................ ........................... 27 7.3 usb power supply ................................ ................................ ................................ .............................. 27 7.4 self - powered mode ................................ ................................ ................................ ............................. 27 7.5 bus - powered mode ................................ ................................ ................................ ............................. 28 7.6 usb suspend current ................................ ................................ ................................ ......................... 29 7.7 usb detach and wake - up s ignaling ................................ ................................ ................................ .. 29 7.8 usb driver ................................ ................................ ................................ ................................ .......... 30 7.9 usb v2.0 compliance and compatibility ................................ ................................ ............................ 30 8 serial peripheral interface (spi) ................................ ................................ ................................ ................. 31 9 pcm codec interface ................................ ................................ ................................ ................................ . 32 9.1 pcm interface master/slave ................................ ................................ ................................ ............... 32 9.2 long frame sync ................................ ................................ ................................ ................................ 33 9.3 short frame sync ................................ ................................ ................................ ............................... 33 9.4 multi - slot operation ................................ ................................ ................................ ............................. 34 9.5 gci interface ................................ ................................ ................................ ................................ ....... 34 9.6 slots and sample formats ................................ ................................ ................................ .................. 35 9.7 additional features ................................ ................................ ................................ ............................. 36 9.8 pcm_clk and pcm_sync gen eration ................................ ................................ ............................ 36 9.9 pcm configuration ................................ ................................ ................................ .............................. 37
bluegiga technologies oy 10 i/o parallel ports ................................ ................................ ................................ ................................ ..... 39 10.1 pio defaults ................................ ................................ ................................ ................................ . 39 11 reset ................................ ................................ ................................ ................................ ....................... 40 11.1 pin states on reset ................................ ................................ ................................ ..................... 40 12 certifications ................................ ................................ ................................ ................................ ........... 41 12.1 bluetooth ................................ ................................ ................................ ................................ ...... 41 12.2 fcc and ic ................................ ................................ ................................ ................................ .. 41 12.2.1 fcc et ic ................................ ................................ ................................ ................................ ..... 43 12.3 ce ................................ ................................ ................................ ................................ ................ 45 12.4 mic japan ................................ ................................ ................................ ................................ .... 45 13 contact information ................................ ................................ ................................ ................................ . 46
bluegiga technologies oy wt11i bluetooth? module description wt11i is a fully integrated bluetoot h 2.1 + edr, class 1 module combining antenna, bluetoot h radio and an on - board iwrap bluetooth stack. bluegiga wt11i provides an ideal solution for developers that want to quickly integrate long range and high performance bluetoot h wireless t echnology to their design without investing several months into bluet oot h radio and stack development. wt11i provides a 100db link budget ensuring long rage and robust bluetoot h connectivity. wt11i uses bluegiga's iwrap bluetoot h stack, which is an embedded bluetoot h stack implementing 13 different bluetooth profiles and ap ple iap connectivity. by using wt11i combined with iwrap bluetoot h stack and bluegiga's excellent technical support designers ensure quick time to market, low development costs and risk . applicat ions : ? industrial and m2m ? point - of - sale devices ? computer accessories key features: radio features: ? bluetooth v.2.1 + edr ? bluetooth class 1 radio ? transmit power: +17 dbm ? receiver sensitivity: - 86 dbm ? range: 350 meters line - of - sight ? integrated chip antenna or u.fl connector hardware features: ? uart and usb host interfaces ? 802.11 co - existence interface ? 6 software programmable io pins ? operating voltag e: 2.7v to 3.6v ? temperature range: - 40c to +85c ? dimensions: 35.75 x 14.50 x 2.6 mm qualifications: ? bluetooth ? ce ? fcc ? ic ? japan physical outlook
bluegiga technologies oy page 8 of 46 1 ordering information table 1 : ordering information *) custom firmware means any standard firmware with custom parameters (like uart baud rate), custom firmware developer by customer or custom f irmware developed by bluegiga for the customer. to order custom firmware you must have a properly filled custom firmware order from and unique ordering code issued by bluegiga. contact sales@bluegiga.com for more information. u.fl connector internal chip antenna iwrap 5.0 firmware wt11i-e-ai5 wt11i-a-ai5 iwrap 4.0 firmware wt11i-e-ai4 wt11i-a-ai4 iwrap 3.0 firmware wt11i-e-ai3 wt11i-a-ai3 hci firmware, bt2.1 + edr wt11i-e-hci21 WT11I-A-HCI21 custom firmware wt11i-e-c (* wt11i-a-c (*
bluegiga technologies oy page 9 of 46 2 pinout and terminal description figure 1 : wt11i connection diagram table 2 : supply and rf terminal descriptions wt11i gnd vdd_pa pio2 pio3 uart_rts# uart_rx pcm_out usb+ usb - uart_cts# pcm_in pcm_clk pcm_sync gnd gnd aio uart_tx pio5 spi_mosi spi_miso spi_clk spi_cs# pio4 pio7 pio6 reset vdd gnd 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 pin number pad type description reset 17 input, internal 220kohm pull-down, internal start up reset circuitry active high reset. keep high for >5 ms to cause a reset gnd 1, 14, 15, 28 gnd gnd vdd_pa 2 supply voltage supply voltage for the rf power amplifier vdd 16 supply voltage supply voltage for bc4 and the flash memory
bluegiga technologies oy page 10 of 46 table 3 : gpio terminal descriptions table 4 : pcm terminal descriptions table 5 : uart terminal descriptions pio port pin number pad type description pio[2] 3 bi-directional, programmamble strength internal pull-down/pull-up programmamble input/output line pio[3] 4 bi-directional, programmamble strength internal pull-down/pull-up programmamble input/output line pio[4] 20 bi-directional, programmamble strength internal pull-down/pull-up programmamble input/output line pio[5] 25 bi-directional, programmamble strength internal pull-down/pull-up programmamble input/output line pio[6] 18 bi-directional, programmamble strength internal pull-down/pull-up programmamble input/output line pio[7] 19 bi-directional, programmamble strength internal pull-down/pull-up programmamble input/output line aio[1] 27 bi-directional programmamble analog input/output line spi interface pin number pad type description pcm_out 7 cmos output, tri-state, weak internal pull-down synchronous data output pcm_in 11 cmos input, weak internal pull-down synchronous data input pcm_sync 13 bi-directional, weak internal pull-down synchronous data sync pcm_clk 12 bi-directional, weak internal pull-down synchronous data clock uart interfaces pin number pad type description uart_tx 26 cmos output, tri- state, with weak internal pull-up uart data output, active high uart_rts# 5 cmos output, tri- state, with weak internal pull-up uart request to send, active low uart_rx 6 cmos input, tri- state, with weak internal pull-down uart data input, active high uart_cts# 10 cmos input, tri- state, with weak internal pull-down uart clear to send, active low
bluegiga technologies oy page 11 of 46 table 6 : usb terminal descriptions t able 7 : terminal descriptions usb interfaces pin number pad type description usb+ 8 bidirectional usb data plus with selectable internal 1.5k pull-up resistor usb- 9 bidirectional usb data minus spi interface pin number pad type description spi_mosi 24 cmos input with weak internal pull-down spi data input spi_cs# 21 cmos input with weak internal pull-up chip select for serial peripheral interface, active low spi_clk 22 cmos input with weak internal pull-down spi clock spi_miso 23 cmos output, tristate, with weak internal pull down spi data output
bluegiga technologies oy page 12 of 46 3 electrical characteristics 3.1 absolute maximum ratings table 8 : absolute maximum ratings 3.2 recommended operating conditions *) v dd_pa has an effect on the rf output power. table 9 : recommended operating conditions 3.3 current consumption table 10 : wt11i current consumption min max unit -40 85 c -0.4 3.6 v vss-0.4 vdd+0.4 v rating storage temperature other terminal voltages vdd_pa, vdd min max unit -40 85 c 3.0 3.6 v rating operating temperature range vdd_pa, vdd *) packet type power level max avg unit 17 dbm 180 72 12 dm 110 54 17 dbm 170 128 12 dm 110 84 2dh5 12 dm 120 93 3dh5 12 dm 120 93 rx - - - 39 sleep - - - 50 a inquiry - 17 dbm 59 ma dh1 dh5 tx ma
bluegiga technologies oy page 13 of 46 3.4 pio current sink and source capability figure 2 : wt1 1 i pio current drive capability 3.5 radio charac t eristics figure 3 : wt11i - a tx power vs vdd_pa supply voltage
bluegiga technologies oy page 14 of 46 figure 4 : power control steps of wt11i - a
bluegiga technologies oy page 15 of 46 3.6 antenna spec ification wt11i uses a monopole type on a c hip antenna with maximum gain o f 0.5 dbi. the radiation pattern and the total radiated efficiency are dependent on the layout and any metal around the antenna has an effect on the radiation characteristics. typica lly the efficiency is 30 50%. figure 5 : anten na radiation pattern in a usb do ngle layout figure 6 : antenna radiation pattern in a usb dongle layout wt11i - a
bluegiga technologies oy page 16 of 46 figure 7 : antenna radiat ion pattern in a usb dongle layout figure 8 : antenna radiation pattern in the wt11 evaluation kit figure 9 : antenna radiation pattern in the wt11 evaluation kit wt11i
bluegiga technologies oy page 17 of 46 figure 10 : ant enna radiation pattern in the wt11 evaluation kit
bluegiga technologies oy page 18 of 46 4 physical dimensions figure 11 : physical dimensions (top view) tolerance for the thickness is +/ - 10% figure 12 : dimensions of wt11i 2.6mm 35.75mm (+/ - 0.2mm) 2.1mm 11.4mm 14.5mm (+/ - 0.2mm) 6.3mm 10.0mm
bluegiga technologies oy page 19 of 46 4.1 package drawings figure 13 : wt11i taping
bluegiga technologies oy page 20 of 46 figure 14 : wt11i o rientation in the r eel
bluegiga technologies oy page 21 of 46 5 layout guidelines wt11i is pin compa tible with wt11 despite of slig h t ly different external dime nsions. for new design it recommended t o follow the land pattern shown in the figure below. figure 15 : recommended pcb land pattern for wt11i do not place any copper under the antenna. the minimum recommended keep out area is shown in the figure 16 . any dielectric ma terial in close proximity to the antenna will effect on the impedance matching of the antenna by lowering the resonance frequency. figure 17 shows how different fr4 thickness under the antenna effect on the resonance frequency. recommended pcb thickness fo r the pcb is 1.6 mm C 2.8 mm. avoid placing plastic cover closer than 3 mm from the antenna as this will also tune the resonance frequency downwards.
bluegiga technologies oy page 22 of 46 figure 16 : recommended metal keep put area for wt11i figure 17 : effect of fr4 under the antenna to the resonant frequency use good layout practices to avoid excessive noise coupling to supply voltage traces or sensitive analog signal traces, such as analog audio signals. if using overlapping ground pl anes use stitching vias separated by max 3 mm to avoid emission from the edges of the pcb. connect all the gnd pins directly to a solid gnd plane and make sure that there is a low impedance path for the return current following the signal and supply traces all the way from start to the end. edge of the pcb do not place copper or any metal within the area marked with cross lines gnd area with stitching vias effect of pcb thickness to the antenna impedance matching -40 -35 -30 -25 -20 -15 -10 -5 0 2300 2350 2400 2450 2500 2550 2600 freq (mhz) s11 (db) 1 mm 2 mm 3 mm bt band
bluegiga technologies oy page 23 of 46 a good practice is to dedicate one of the inner layers to a solid gnd plane and one of the inner layers to supply voltage planes and traces and route all the signals on top and bottom layers of the pcb. this arrangement will make sure that any return current follows the forward current as close as possible and any loops are minimized. figure 18 : typical 4 - layer pcb construction figure 19 : use of stitching vias to a void emissions from the edges of the pcb layout ? supply voltage C if possible use solid power plane C make sure that solid gnd plane follows the traces all the way C do not route supply voltage traces across separated gnd regions so that the path for the return current is cut ? mic input C place lc filtering and dc coupling capacitors symmetrically as c lose to audio pins as possible C place mic biasing resistors symmetrically as close to microhone as possible. C make sure that the bias trace does not cross separated gnd regio ns (dgnd - > agnd) so that the path for the return current is cut. if this is not possible the do not separate gnd regions but keep one solid gnd plane. C keep the trace as short as possible signals gnd power signals recommended pcb layer configuration overlapping gnd layers without gnd stitching vias overlapping gnd layers with gnd stitching vias shielding the rf energy
bluegiga technologies oy page 24 of 46 6 uart interface this is a standard uart interface for communicating with other serial devices. wt11i uart interface provides a simple mechanism for communicating with other serial devices using the rs232 protocol. four signals are used to implement the uart function . when wt11i is connected to another digital device, uart_rx and uart_tx transfer data between the two devices. the remaining two signals, uart_cts and uart_rts, can be used to implement rs232 hardware flow control where both are active low indicators. all uart connections are implemented using cmos technology and have signalling levels of 0v and vdd . uart configuration parameters, such as data rate and packet format, are set using wt11i software. note : in order to communicate with the uart at its maximum data rate using a standard pc, an accelerated serial port adapter card is required for the pc. table 11 : possible uart settings the uart interface is capable of resetting wt 11i upon reception of a break signal. a break is identified by a continuous logic low (0v) on the uart_rx terminal, as shown in figure 9 . if tbrk is longer than the value, defined by pskey_host_io_uart_reset_timeout, (0x1a4), a reset will occur. this featu re allows a host to initialise the system to a known state. also, wt11i can emit a break character that may be used to wake the host. figure 20 : break signal table 11 shows a list of commonly used data rates and their associated values for pskey_uart_baud_rate (0x204). there is no requirement to use these standard values. any data rate within the supported range can be set in the ps key according to the formula in equation 1
bluegiga technologies oy page 25 of 46 equation 1 : data rate t able 12 : standard data rates
bluegiga technologies oy page 26 of 46 6.1 uart bypass figure 21 : uart bypass architecture 6.2 uart configuration while reset is active the uart interface for wt11i while the chip is being held in reset is tristate. this will allow the user to daisy chain devices onto the physical uart bus. the constraint on this method is that any devices connected to this bus must tristate when wt11i reset is de - asserted and the firmware begins to run. 6.3 uart bypass mode alternatively, for devices that do not tristate the uart bus, the uart bypass mode on bluecore4 - external can be used. the default state of bluecore4 - external after reset is de - asserted; this is for the host uart bus to be connected to the bluecore4 - external uart, thereby al lowing communication to bluecore4 - external via the uart. all uart bypass mode connections are implemented using cmos technology and have signalling levels of 0v and vdd . in order to apply the uart bypass mode, a bccmd command will be issued to bluecore4 - ex ternal. upon this issue, it will switch the bypass to pio[7:4] as figure 21 indicates. once the bypass mode has been invoked, wt11i will enter the deep sleep state indefinitely. in order to re - establish communication with wt11i , the chip must be reset so t hat the default configuration takes effect. it is important for the host to ensure a clean bluetooth disconnection of any active links before the bypass mode is invoked. therefore, it is not possible to have active bluetooth links while operating the bypas s mode . the current consumption for a device in uart bypass mode is equal to the values quoted for a device in s tandby mode.
bluegiga technologies oy page 27 of 46 7 usb interface this is a full speed (12mbits/s) usb interface for communicating with other compatible digital devices. wt11i acts a s a usb peripheral, responding to requests from a master host controller such as a pc. the usb interface is capable of driving a usb cable directly. no external usb transceiver is required. the device operates as a usb peripheral, responding to requests f rom a master host controller such as a pc. both the ohci and the uhci standards are supported. the set of usb endpoints implemented can behave as specified in the usb section of the bluetooth v2.1 + edr specification or alternatively can appear as a set of endpoints appropriate to usb audio devices such as speakers. as usb is a master/slave oriented system (in common with other usb peripherals), wt11i only supports usb slave operation. 7.1 usb data connections the usb data lines emerge as pins usb_dp and usb_dn . these terminals are connected to the internal usb i/o buffers of the bluecore4 - external, therefore, have a low output impedance. to match the connection to the characteristic impedance of the usb cable, resistors must be placed in series with usb_dp/usb_ dn and the cable. 7.2 usb pull - up resistor wt11i features an internal usb pull - up resistor. this pulls the usb_dp pin weakly high when wt11i is ready to enumerate. it signals to the pc that it is a full speed (12mbits/s) usb device. the usb internal pull - up i s implemented as a current source, and is compliant with section 7.1.5 of the usb specification v1.2. the internal pull - up pulls usb_dp high to at least 2.8v when loaded with a 15k 5% pull - down resistor (in the hub/host) when vdd_pads = 3.1v. this presents a thevenin resistance to the host of at least 900. alternatively, an external 1.5k pull - up resistor can be placed between a pio line and d+ on the usb cable. the firmware must be alerted to which mode is used by setting pskey_usb_pio_pullup appropriately. the default setting uses the internal pull - up resistor. 7.3 usb power supply the usb specification dictates that the minimum output high voltage for usb data lines is 2.8v. to safely meet the usb specif ication, the voltage on the vdd supply terminal must be a n absolute minimum of 3.1v. bluegiga recommends 3.3v for optimal usb signal quality. 7.4 self - powered mode in self - powered mode, the circuit is powered from its own power supply and not from the vbus (5v) line of the usb cable. it draws only a small leakage cu rrent (below 0.5ma) from vbus on the usb cable. this is the easier mode for which to design, as the design is not limited by the power that can be drawn from the usb hub or root port. however, it requires that vbus be connected to wt11i via a resistor netw ork (rvb1 and rvb2), so wt11i can detect when vbus is powered up. bluecore4 - external will not pull usb_dp high when vbus is off. self - powered usb designs (powered from a battery or psu) must ensure that a pio line is allocated for usb pullup purposes. a 1. 5k 5% pull - up resistor between usb_dp and the selected pio line should be fitted to the design. failure to fit this resistor may result in the design failing to be usb compliant in self - powered mode. the internal pull - up in bluecore is only suitable for bu s - powered usb devices, e.g., dongles.
bluegiga technologies oy page 28 of 46 figure 22 : usb connections for self - powered mode the terminal marked usb_on can be any free pio pin. the pio pin selected must be registered by setting pskey_usb_pio_vbus to the corresponding pin number. figure 23 : usb interface component values **) wt11i has internal 22 ohm series resistors at the usb lines. 7.5 bus - powered mode in bus - powered mode, the application circuit draws its current fro m the 5v vbus supply on the usb cable. wt11i negotiates with the pc during the usb enumeration stage about how much current it is allowed to consume. on power - up the device must not draw more than 100 ma but after being configured it can draw up to 500 ma . for wt11i , the usb power descriptor should be altered to reflect the amount of power required. this is accomplished by setting pskey_usb_max_power (0x2c6). this is higher than for a class 2 application due to the extra current drawn by the transmit rf pa. b y default for wt11i the setting is 300 ma . when selecting a regulator, be aware that vbus may go as low as 4.4v. the inrush current (when charging reservoir and supply decoupling capacitors) is limited by the usb specification. see the usb specification. some applications may require soft start circuitry to limit inrush current if more than 10 u f is present between vbus and gnd. the 5v vbus line emerging from a pc is often electrically noisy. as well as regulation down to 3.3v and 1.8v, applications should include careful filtering of the 5v line to attenuate noise that is above the voltage regulator bandwidth. excessive noise on wt11i supply pins will result in reduced receive r sensitivity and a distorted rf transmit signal. identifier value function r s 0 to 10 (to be matched per design)** impedance matching to usb cable r vb1 22k 5% vbus on sense divider r vb2 47k 5% vbus on sense divider
bluegiga technologies oy page 29 of 46 figure 24 : usb connections for bus - powered mode 7.6 usb suspend current all usb devices must permit the usb controller to place them in a usb suspend mode. while in usb suspend, bus - powered d evices must not draw more than 2 .5ma from usb vbus (self - powered devices may draw more than 2 .5ma from their own supply). this current draw requirement prevents operation of the radio by bus - powered devices during usb suspend. when computing suspend current, the current from vbus through the bus pull - up and pull - d own resistors must be included. the pull - up resistor at the device is 1.5 k. (nominal). the pull - down resistor at the hub is 14.25k. to 24.80k. the pull - up voltage is nominally 3.3v, which means that holding one of the signal lines high takes approximately 200ua, leavi ng only 2.3ma available from a 2.5ma budget. ensure that external leds and/or amplifiers can be turned off by bluecore4 - external. the entire circuit must be able to enter the suspend mode. 7.7 usb detach and wake - up signal ing wt11i can provide out - of - band sig na ling to a host controller by using the control lines called usb_detach and usb_wake_up. these are outside the usb specification (no wires exist for them inside the usb cable), but can be useful when embedding wt11i into a circuit where no external usb is visible to the user. both control lines are shared with pio pins and can be assigned to any pio pin by setting pskey_usb_pio_detach and pskey_usb_pio_wakeup to the selected pio number. usb_detach is an input which, when asserted high, causes wt11i to put usb_dn and usb_dp in high impedance state and turns off the pull - up resistor on dp. this detaches the device from the bus and is logically equivalent to unplugging the device. when usb_detach is taken low, wt11i will connect back to usb and await enumerati on by the usb host. usb_wake_up is an active high output (used only when usb_detach is active) to wake up the host and allow usb communication to recommence. it replaces the function of the software usb wake_up message (which runs over the usb cable) and c annot be sent while bluecore4 - external is effectively disconnected from the bus.
bluegiga technologies oy page 30 of 46 figure 25 : usb_detach and usb_wake_up signals 7.8 usb driver a usb bluetooth device driver is required to provide a software interface between bluecore4 - external and bluetooth software running on the host computer. please, contact support@bluegiga.com for suitable drivers. 7.9 usb v2.0 compliance and compatibility although wt11i meets the usb specification, csr can not guarantee that an application circuit designed around the module is usb compliant. the choice of application circuit, component choice and pcb layout all affect usb signal quality and electrical characteristics. the information in this document is inte nded as a guide and should be read in association with the usb specification, with particular attention being given to chapter 7. independent usb qualification must be sought before an application is deemed usb compliant and can bear the usb logo. such qua lification can be obtained from a usb plugfest or from an independent usb test house. terminals usb_dp and usb_dn adhere to the usb specification v2.0 (chapter 7) electrical requirements. bluecore4 - external is compatible with usb v2.0 host controllers; und er these circumstances the two ends agree the mutually acceptable rate of 12mbits/s according to the usb v2.0 specification.
bluegiga technologies oy page 31 of 46 8 serial peripheral interface (spi) the spi port can be used for s y stem debugging. it can also be used for programming the flash me mor y and setting the pskey configurations . wt11i uses 16 - bit data and 16 - bit address serial peripheral interface, where transactions may occur when the internal processor is running or is stopped. spi interface is connected using the mosi, miso, csb and cl k pins. spi interface cannot be used for application purposes.
bluegiga technologies oy page 32 of 46 9 pcm codec interface pcm is a standard method used to digitiz e audio (particularly voice) for transmission over digital communication channels. through its pcm interface, wt11i has hardware sup port for continual transmission and reception of pcm data, thus reducing processor overhead for wireless headset applications. wt11i offers a bidirectional digital audio interface that routes directly into the baseband layer of the on - chip firmware. it doe s not pass through the hci protocol layer. hardware on wt11i allows the data to be sent to and received from a sco connection. up to three sco connections can be supported by the pcm interface at any one time. wt11i can operate as the pcm interface master generating an output clock of 128, 256 or 512khz. when configured as pcm interface slave, it can operate with an input clock up to 2048khz. wt11i is compatible with a variety of clock formats, including long frame sync, short frame sync and gci timing envi ronments. it supports 13 - bit or 16 - bit linear, 8 - bit - law or a - law companded sample formats at 8ksamples/s and can receive and transmit on any selection of three of the first four slots following pcm_sync. the pcm configuration options are enabled by sett ing pskey_pcm_config32. wt11i interfaces directly to pcm audio devices. note: analog audio lines are very sensitive to rf disturbance. use good layout practices to ensure noise less audio . make sure that the return path for the audio signals follows the f orward current all the way as close as possible and use fully differential signals when possible. d o not compromise audio routing. 9.1 pcm interface master/slave when configured as the master of the pcm interface, wt11i generates pcm_clk and pcm_sync. figur e 26 : pcm interface master when configured as the slave of the pcm interface, wt11i accepts pcm_clk rates up to 2048khz.
bluegiga technologies oy page 33 of 46 figure 27 : pcm interface slave 9.2 long frame sync long frame sync is the name given to a clocking format that controls the transfer of pcm data words or samples. in long frame sync, the rising edge of pcm_sync indicates the start of the pcm word. when wt11i is configured as pcm master, generating pcm_sync and pcm_clk, then pcm_sync is 8 - bit s long. when wt11i is configured as pcm slave, pcm_sync may be from two consecutive falling edges of pcm_clk to half the pcm_sync rate, i.e., 62.5s long. figure 28 : long frame sync (shown with 8 - bit companded sample) wt11i samp les pcm_in on the falling edge of pcm_clk and transmits pcm_out on the rising edge. pcm_out may be configured to be high impedance on the falling edge of pcm_clk in the lsb position or on the rising edge. 9.3 short frame sync in short frame sync, the falling edge of pcm_sync indicates the start of the pcm word. pcm_sync is always one clock cycle long.
bluegiga technologies oy page 34 of 46 figure 29 : short frame sync (shown with 16 - bit sample) as with long frame sync, wt11i samples pcm_in on the falling edge of pcm_clk a nd transmits pcm_out on the rising edge. pcm_out may be configured to be high impedance on the falling edge of pcm_clk in the lsb position or on the rising edge. 9.4 multi - slot operation more than one sco connection over the pcm interface is supported using m ultiple slots. up to three sco connections can be carried over any of the first four slots. figure 30 : multi - slot operation with two slots and 8 - bit companded samples 9.5 gci interface wt11i is compatible with the gci, a standard sy nchronous 2b+d isdn timing interface. the two 64kbits/s b channels can be accessed when this mode is configured.
bluegiga technologies oy page 35 of 46 figure 31 : gci interface the start of frame is indicated by the rising edge of pcm_sync and runs at 8khz. with wt11 i in slave mode, the frequency of pcm_clk can be up to 4.096mhz. 9.6 slots and sample f o r mats wt11i can receive and transmit on any selection of the first four slots following each sync pulse. slot durations can be either 8 or 16 clock cycles. durations of 8 clock cycles may only be used with 8 - bit sample formats. durations of 16 clocks may be used with 8 - bit, 13 - bit or 16 - bit sample formats. wt11i supports 13 - bit linear, 16 - bit linear and 8 - bit - law or a - law sample formats. the sample rate is 8ksamples/s. the bit order may be little or big endian. when 16 - bit slots are used, the 3 or 8 unused bits in each slot may be filled with sign extension, padded with zeros or a programmable 3 - bit audio attenuation compatible with some motorola codecs.
bluegiga technologies oy page 36 of 46 figure 32 : 16 - bit slot length and sample formats 9.7 additional features wt11i has a mute facility that forces pcm_out to be 0. in master mode, pcm_sync may also be forced to 0 while keeping pcm_clk running which some codecs use to control power down. 9.8 pcm_clk and pcm_sync generation wt11i has two methods of generating pcm_clk and pcm_sync in master mode. the first is generating these signals by dds from bluecore4 - external internal 4mhz cl ock. using this mode limits pcm_clk to 128, 256 or 512khz and pc m_sync to 8khz. the second is generating pcm_clk and pcm_sync by dds from an internal 48mhz clock (which allows a greater range of frequencies to be generated with low jitter but consumes more power). this second method is selected by setting bit 48m_pcm_c lk_gen_en in pskey_pcm_config32. when in this mode and with long frame sync, the length of pcm_sync can be either 8 or 16 cycles of pcm_clk, determined by long_length_sync_en in pskey_pcm_config32. the equation xxx describes pcm_clk frequency when being ge nerated using the internal 48mhz clock:
bluegiga technologies oy page 37 of 46 equation 2 : pcm_clk frequency when being generated using the internal 48mhz clock the frequency of pcm_sync relative to pcm_clk can be set using equation xxx : equation 3 : pcm_sync frequency relative to pcm_clk cnt_rate, cnt_limit and sync_limit are set using pskey_pcm_low_jitter_config. as an example, to generate pcm_clk at 512khz with pcm_sync at 8khz, set pskey_pcm_low_jitter_config to 0x08080177. 9.9 pcm con figuration the pcm configuration is set using two ps keys, pskey_pcm_config32 detailed in table 12 and pskey_pcm_low_jitter_config in table 13 . the default for pskey_pcm_config32 is 0x00800000, i.e., first slot following sync is active, 13 - bit linear voice format, long frame sync and interface master generating 256khz pcm_clk from 4mhz internal clock with no tri - state of pcm_out.
bluegiga technologies oy page 38 of 46 table 13 : pskey_pcm_config32 description table 14 : pskey_pcm_low_jitter_config description name bit position description - 0 set to 0 slave mode en 1 0 selects master mode with internal generation of pcm_clk and pcm_sync. 1 selects slave mode requiring externally generated pcm_clk and pcm_sync. this should be set to 1 if 48m_pcm_clk_gen_en (bit 11) is set. short sync en 2 0 selects long frame sync (rising edge indicates start of frame), 1 selects short frame sync (falling edge indicates start of frame). - 3 set to 0 sign extended en 4 0 selects padding of 8 or 13-bit voice sample into a 16- bit slot by inserting extra lsbs, 1 selects sign extension. when padding is selected with 3-bit voice sample, the 3 padding bits are the audio gain setting; with 8-bit samples the 8 padding bits are zeroes. lsb first en 5 0 transmits and receives voice samples msb first, 1 uses lsb first. tx tristate en 6 0 drives pcm_out continuously, 1 tri-states pcm_out immediately after the falling edge of pcm_clk in the last bit of an active slot, assuming the next slot is not active. tx tristate rising edge en 7 0 tristates pcm_out immediately after the falling edge of pcm_clk in the last bit of an active slot, assuming the next slot is also not active. 1 tristates pcm_out after the rising edge of pcm_clk. sync suppress en 8 0 enables pcm_sync output when master, 1 suppresses pcm_sync whilst keeping pcm_clk running. some codecs utilize this to enter a low power state. gci mode en 9 1 enables gci mode. mute en 10 1 forces pcm_out to 0. 48m pcm clk gen en 11 0 sets pcm_clk and pcm_sync generation via dds from internal 4 mhz clock, as for bluecore4-external. 1 sets pcm_clk and pcm_sync generation via dds from internal 48 mhz clock. long length sync en 12 0 sets pcm_sync length to 8 pcm_clk cycles and 1 sets length to 16 pcm_clk cycles. only applies for long frame sync and with 48m_pcm_clk_gen_en set to 1. - [20:16] set to 0b00000. master clk rate [22:21] selects 128 (0b01), 256 (0b00), 512 (0b10) khz pcm_clk frequency when master and 48m_pcm_clk_gen_en (bit 11) is low. active slot [26:23] default is 0001. ignored by firmaware sample_format [28:27] selects between 13 (0b00), 16 (0b01), 8 (0b10) bit sample with 16 cycle slot duration 8 (0b11) bit sample 8 cycle slot duration. name bit position description cnt limit [12:0] sets pcm_clk counter limit cnt rate [23:16] sets pcm_clk count rate. sync limit [31:24] sets pcm_sync division relative to pcm_clk.
bluegiga technologies oy page 39 of 46 10 i/o parallel ports six lines of programmable bidirectional input/output s (i/o) are provided. all the pio lines are power from vdd. pio lines can be configured through software to have eithe r weak or strong pull - ups or pull - downs. all pio lines are configured as inputs with weak pull - downs at reset. any of the pio lines can be configured as interrupt request lines or as wake - up lines from sleep modes. wt11i ha s a general purpose analogue inte rface pin aio[1] . this is used to access internal circuitry and control signals. it may be configured to provide additional functionality. auxilia ry functions available via aio[1] include an 8 - bit adc and an 8 - bit dac. typically the adc is used for battery voltage measurem ent. signals selectable at this pin include the band gap reference voltage and a variety of clock signals: 48, 24, 16, 8mhz and the xtal clock frequency. when used with analogue signals, the voltage range is constrained by the analogue sup ply voltage internally to the module (1.8v). when configured to drive out digital level signals (e.g., clocks), the output voltage level is determined by vdd. 10.1 pio defaults bluegiga cannot guarantee that these terminal functions remain the same. refer to th e software release note for the implementation of these pio lines, as they are firmware build - specific.
bluegiga technologies oy page 40 of 46 11 reset wt11i may be re set from several sources: reset pin, power on reset, a uart break character or via software configured watchdog timer. the reset p in is an active high reset and is internally filtered using the internal low frequency clock oscillator. a reset will be performed between 1.5 and 4.0ms following resetb being activ e. it is recommended that reset be applied for a period greater than 5ms. t he power on reset occurs when the vdd_core supply internally to the module falls below typically 1.5v and is released when vdd_core rises above typically 1.6v. at reset the digital i/o pins are set to inputs for bidirectional pins and outputs are tri - state . wt11i has an internal power on reset circuit which holds the module in reset until all the supply voltages have stabilized. the reset pin must be either floating or connected to high impedance during power on in order for the power on reset circuit to wo rk properly. if the reset pin is not connected to high impedance during power on, then one must ensure that the reset is kept active until all the supply voltages have stabilized to prevent the flash memory getting corrupted. 11.1 pin states on reset table 15 : pin states on reset pin name state pio[7:2] input with weak pull-down pcm_out tri-staed with weak pull-down pcm_in input with weak pull-down pcm_sync input with weak pull-down pcm_clk input with weak pull-down uart_tx output tristated with weak pull-up uart_rx input with weak pull-down uart_rts output tristated with weak pull-up uart_cts input with weak pull-down usb+ input with weak pull-down usb- input with weak pull-down spi_csb input with weak pull-down spi_clk input with weak pull-down spi_mosi input with weak pull-down spi_miso output tristated with weak pull-down aio[1] output, driving low
bluegiga technologies oy page 41 of 46 12 certifications wt11i - a is compliant to the following specifications. 12.1 bluetooth wt11i - a module is bluetooth qualified a nd listed as a controller subsystem and it is bluetooth compl iant to the following profiles of the core spec version 2.1/2.1+edr . ? baseband ? hci ? link manager ? radio 12.2 fcc and ic for fcc, i f the tx power of a bluetooth module is higher than 13.9 dbm and the end product is used closer than 20 cm from a human body, rf e xposure has to be evaluated in the end product. for ic there is a similar requirement except the power limit is 12 dbm. this might require either an own fcc id for the end product, or class 2 permissive change to the grant of wt11i. wt11i is certified with both 12 dbm (fcc id: qoqwt11ia) and 17 dbm (fcc id: qoqwt11i) tx power. when using qoqwt11ia, rf exposure evaluation is not needed, but the tx power must be limited to 12 dbm. wt11i complies with part 15 of the fcc rules. operation is subject to the fol lowing two co nditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. fcc rf radiation exposure statement: this equipment complie s with fcc radiation exposure limits set forth for an uncontrolled environment. end users must follow the specific operating instructions for satisfying rf exposure compliance. this transmitter must not be co - located or operating in conjunction with any ot her antenna or transmitter , except in accordance with fcc test procedures . this transmitter is considered as mobile device . if tx power is set to 17 dbm, class 2 permissive change is required t o allow portable use in a known host . please contact support@bluegiga.com for detailed information.
bluegiga technologies oy page 42 of 46 ic statements : this device complies with industry canada licence - exempt rss standard(s). operation is subject to the following two conditions: (1) this device may not cau se interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device. under industry canada regulations, this radio transmitter may only operate using an antenna of a type and maximum (o r lesser) gain approved for the transmitter by industry canada. to reduce potential radio interference to other users, the antenna type and its gain should be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that neces sary for successful communication. oem responsibilities to comply with fcc and industry canada regulations the wt11i - a m odule has been certified for integration into products only by oem integrators under the following conditions: ? the antenna(s) must be installed such that a minimum separation distance of 20cm is maintained between the radiator (antenna) and all persons at all times. ? the transmitter module must not be co - located or operating in conjunction with any other antenna or transmitter. as long as the two conditions above are met, further transmitter testing will not be required. however, the oem integrator is still responsible for testing their end - product for any additional compliance requirements required with this module installed (for exampl e, digital device emissions, pc peripheral requirements, etc.). important note: in the event that these conditions can not be met (for certain configurations or co - location with another transmitter), then the fcc and industry canada authorizations are no longer considered valid and the fcc id and ic certification number can not be used on the final product. in these circumstances, the oem integrator will be responsible for re - evaluating the end product (including the transmitter) and obtaining a separate f cc and industry canada authorization. end product labeling the wt11i - a module is labeled with its own fcc id and ic certification number. if the fcc id and ic certification number are not visible when the module is installed inside another device, then th e outside of the device into which the module is installed must also display a label referring to the enclosed module. in that case, the final end product must be labeled in a visible area with the following: contains transmitter module fcc id: qoqwt 11 ia contains transmitter module ic: 5123a - bgtwt 11ia or contains fcc id: qoqwt1 1 ia contains ic: 5123a - bgtwt 11ia the oem of the wt11i - a m odule must only use the approved antenna. the oem integrator has to be aware not to provide information to the e nd user regarding how to install or remove this rf module or change rf related parameters in the user manual of the end product. to comply with fcc and industry canada rf radiation exposure limits for general population, the antenna(s) used for this trans mitter must be installed such that a minimum separation distance of 20cm is maintained between the radiator (antenna) and all persons at all times and must not be co - located or operating in conjunction with any other antenna or transmitter.
bluegiga technologies oy page 43 of 46 12.2.1 fcc et ic cet appareil est conforme lalina 15 des rgles de la fcc. deux conditions sont respecter lors de son utilisation : (1) cet appareil ne doit pas crer dinterfrence susceptible de causer un quelconque dommage et, (2) cet appareil doit accepter toute interfrence , quelle quelle soit, y compris les interfrences susceptibles dentra?ner un fonctionnement non requis. dclaration de conformit fcc dexposition aux radiofrquences (rf): ce matriel respecte les limites dexposition aux radiofrquences fixes par la fcc dans un environnement non contr?l. les utilisateurs finaux doivent se conformer aux instructions dutilisation spcifies afin de satisfaire aux normes dexposition en matire de radiofrquence. ce transmetteur ne doit pas tre install ni utilis en concomitance avec une autre antenne ou un autre transmetteur. ce transmetteur est assimil un appareil mobile et ne doit pas tre utilis moins de 20 cm du corps humain. afin de permettre un usage mobile dans le cadre dun matriel de catgorie 2, il e st ncessaire de procder quelques adaptations. pour des informations dtailles, veuillez contacter le support technique bluegiga : support@bluegiga.com . dclaration de conformit ic : ce matriel respecte l es standards rss exempt de licence dindustrie canada. son utilisation est soumise aux deux conditions suivantes : (1) lappareil ne doit causer aucune interfrence, et (2) lappareil doit accepter toute interfrence, quelle quelle soit, y compris les interfrenc es susceptibles dentra?ner un fonctionnement non requis de lappareil. selon la rglementation dindustrie canada, ce radio - transmetteur ne peut utiliser quun seul type dantenne et ne doit pas dpasser la limite de gain autorise par industrie canada po ur les transmetteurs. afin de rduire les interfrences potentielles avec dautres utilisateurs, le type dantenne et son gain devront tre dfinis de telle fa?on que la puissance isotrope rayonnante quivalente (eirp) soit juste suffisante pour permettre une bonne communication. les responsabilits de lintgrateur afin de satisfaire aux rglementations de la fcc et dindustrie canada : les modules wt11i ont t certifis pour entrer dans la fabrication de produits exclusivement raliss par des intgrate urs dans les conditions suivantes : ? lantenne (ou les antennes) doit tre installe de fa?on maintenir tout instant une distance minimum de 20cm entre la source de radiation (lantenne) et toute personne physique. ? le module transmetteur ne doit pas tr e install ou utilis en concomitance avec une autre antenne ou un autre transmetteur.
bluegiga technologies oy page 44 of 46 tant que ces deux conditions sont runies, il nest pas ncessaire de procder des tests supplmentaires sur le transmetteur. cependant, lintgrateur est responsable des tests effectus sur le produit final afin de se mettre en conformit avec dventuelles exigences complmentaires lorsque le module est install (exemple : missions provenant dappareils numriques, exigences vis - - vis de priphriques informatiques, etc.) ; important : dans le cas o ces conditions ne peuvent tre satisfaites (pour certaines configurations ou installation avec un autre transmetteur), les autorisations fournies par la fcc et industrie canada ne sont plus valables et les numros diden tification de la fcc et de certification dindustrie canada ne peuvent servir pour le produit final. dans ces circonstances, il incombera lintgrateur de faire rvaluer le produit final (comprenant le transmetteur) et dobtenir une autorisation spare de la part de la fcc et dindustrie canada. etiquetage du produit final chaque module wt11i possde sa propre identification fcc et son propre numro de certification ic. si lidentification fcc et le numro de certification ic ne sont pas visibles lorsq uun module est install lintrieur dun autre appareil, alors lappareil en question devra lui aussi prsenter une tiquette faisant rfrence au module inclus. dans ce cas, le produit final doit comporter une tiquette place de fa?on visible affichan t les mentions suivantes : ? contient un module transmetteur certifi fcc qoq wt11i ? ? contient un module transmetteur certifi ic 5123a - bgt wt11i ? ou ? inclut la certification fcc qoq wt11i ? ? inclut la certification ic 5123a - bgt wt11i ? lintgrateur du module wt11i ne doit utiliser que les antennes rpertories dans le tableau 21 certifies pour ce module. lintgrateur est tenu de ne fournir aucune information lutilisateur final autorisant ce dernier installer ou retirer le module rf, ou bien cha nger les paramtres rf du module, dans le manuel dutilisation du produit final. afin de se conformer aux limites de radiation imposes par la fcc et industry canada, lantenne (ou les antennes) utilise pour ce transmetteur doit tre installe de telle s orte maintenir une distance minimum de 20cm tout instant entre la source de radiation (lantenne) et les personnes physiques. en outre, cette antenne ne devra en aucun cas tre installe ou utilise en concomitance avec une autre antenne ou un autre tr ansmetteur.
bluegiga technologies oy page 45 of 46 12.3 ce wt11i meets the requirements of the standards below and hence fulfills the requirements of emc directive 89/336/eec as amended by directives 92/31/eec and 93/68/eec within ce marking requirement. ? emc (immunity only) en 301 489 - 17 v.1.3.3 in accordance with en 301 489 - 1 v1.8.1 ? radiated emissions en 300 328 v1.7.1 12.4 mic japan wt11i has type approval in japan wit h identification code r 209 - j00053
bluegiga technologies oy page 46 of 46 13 contact information sales: sales@bluegiga.com techn ical support: http://techforum.bluegiga.com orders : orders@bluegiga.com 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 f inland 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 techn ologies, inc. 19/f silver fortune plaza, 1 wellington street, central hong kong

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