BT121 Datasheet
Contents
1. 9 435 50660 oinikalliontie 5A 5th floor 02630 Espoo Finland Bluegiga A Silicon Labs Company 462. RTC UART interrupt Power mode 1 Wake up delay lt 70 us Delay 0 us After delay set in HW config or on Sleep command Power mode 2 Figure 5 Power modes in relation to each other and to active mode Bluegiga A Silicon Labs Company 13 4 3 Reset BT121 can be reset by several methods by pulling the RESET pin low by the internal system power up reset functionality or by the internal watchdog timer The RESET pin is internally connected to a pull up resistor with a resistance of approximately 40 kohm The RESET pin should be connected to a push button header or test point to enable the use of the system recovery mode 4 4 Recovery mode Pulling the BOOTO pin high at reset sets the BT121 module s internal microcontroller into a recovery mode which allows the Bluegiga DFU to be rewritten to the module using the DumoGUI software The BOOTO pin should be connected to a header or test point to enable DFU recovery The pin is internally connected to a 10 kohm pull down resistor 4 5 Clock signals BT121 generates all the required clock signals internally The clocks used by the internal microcontroller and external peripherals are synchronized to an internal 32 768 kHz crystal connected to the internal RTC The micro power RTC is always kept running when the module is supplied with power It will take approximately two seconds for the RTC oscillator to stabilize after power is connected To avoid this delay it is recommended that t
3. Recovery mode Clock signals 5 Interfaces 5 1 GPIO 5 2 UART 9 3 5 4 5 5 ADC 5 6 DAC 5 7 Real time clock 5 8 Microcontroller programming interface 6 Antenna 6 1 Effect on antenna matching of a plastic sheet placed near the antenna 6 2 Effect on antenna matching of a metal sheet placed under the antenna 6 3 Effect on antenna matching of a metal sheet placed against the end of the module 6 4 Measured antenna efficiency 6 5 Measured 2D radiation patterns 6 6 Measured 3D radiation patterns 7 Bluetooth Stack Software 8 Hostinterface Bluegiga A Silicon Labs Company co JN o OC D NN Na a ua gu oe ua a ga mil oj 2 SB N WON o KR KR BP D D NN c o N N o L 8 1 UART 9 Connection examples 9 1 Connecting an external host using the UART interface 9 2 Connecting an external device using SPI interface 9 3 Connecting an external device using I C interface 10 Electrical characteristics 10 1 Absolute maximum ratings 10 2 Recommended operating conditions 10 3 Logic signal characteristics 11 RF Characteristics 11 1 Supported frequencies and channels 11 2 Typical receiver sensitivity 11 8 Transmitter output power 11 4 Carrier frequency accuracy 12 Physical dimensions 13 Soldering recommendations 13 1 Soldering profile example 14 Tape and reel packaging 14 1 Reel material and dimensions 14 2 Tape material and dimensions 14 3 Tape and reel box
4. dimensions 14 4 Module orientation in tape 15 Certifications 15 1 CE 15 2 FCC and IC 16 Ordering information 17 Contact Information Bluegiga A Silicon Labs Company 26 27 27 28 29 30 30 30 31 34 34 34 34 34 35 37 38 39 39 39 40 40 41 41 41 45 46 1 BT121 overview BT121 is a Bluetooth Smart Ready module targeted for applications that require both Bluetooth Smart and Classic connectivity It can connect to legacy devices that only support Bluetooth SPP or Apple iAP2 profiles as well to devices that support Bluetooth Smart BT121 integrates a high performance Bluetooth radio a low power ARM Cortex micro controller and a Bluegiga Bluetooth Smart Ready stack software marking it extremely easy to use as no HF or Bluetooth software development is needed BT121 can be used as a modem together with a separate host MCU but applications can also be embedded into the built in ARM Cortex MCU with the Bluegiga BGScript M scripting language 1 1 Key Features Bluetooth features e Bluetooth 4 1 Smart Ready compliant Master and slave modes Upto 6 x BR EDR connections e Upto 7 x BLE connections e x BR EDR 7 x BLE connections simultaneously Radio features e Integrated antenna TX Power o 12 dBm with Bluetooth BR EDR o 10 dBm with Bluetooth LE e RX Sensitivity o 96 dBm e 200 400 meter LoS range Software features e Integrated Bluetooth Smart Ready Stack e SPP iAP2 GATT over BR Bluetooth profiles
5. e Any GATT based Bluetooth Smart profile e 1000 kbps throughput over SPP e 150 kbps throughput over iAP2 e 100 kbps throughput over BLE BGAPI serial protocol API over UART for modem usage BGLIB host API library which implements BGAPI serial protocol BGScript scripting language for standalone usage e Profile Toolkit for creating GATT based services Hardware interfaces e host interface e 2x SPI UART and 2 x I2C peripheral interfaces e Upto 22 x GPIO with interrupts e 4x 12 bit ADC and 2 x 12 bit e Internal temperature sensor e Internal battery voltage measurement option e Clock generator e RTC with calendar Microcontroller e Cortex MO 48 Mhz e 16 RAM e 128kB flash Electrical characteristics e Supply voltage 2 2V to 3 6V e Supply voltage 2 4V to 3 6V when using ADC Environmental and regulatory Temperature range 40C to 85C e Bluetooth CE FCC and IC Japan and South Korea qualified Dimensions e WxLxH 11 0 mm x 13 9 mm x 2 2 mm Feature not implemented on engineering samples and engineering samples are not qualified Bluegiga A Silicon Labs Company 6 1 2 Typical applications BT121 can be used in a wide variety of applications such as health and fitness PoS point of sales M2M connectivity automotive aftermarket industrial and home automation gateways and others 1 3 Block diagram The block diagram for Bluegiga Bluetooth Smart R
6. 19 6 3 Effect on antenna matching of a metal sheet placed against the end of the module As an example on how a metal sheet placed in the vicinity of the module and or antenna effect the antenna matching we can examine Figure 10 below BT121 lication PCB 3 plication EN ic NN Violet curve Violet curve Metal sheet against end of module end Metal sheet at module end 5 mm distance Figure 10 Effect of a metal sheet placed under the antenna on antenna matching Bluegiga A Silicon Labs Company 20 6 4 Measured antenna efficiency The measured antenna efficiency as a function of frequency is shown in Figure 11 below Figure 11 Antenna efficiency related to frequency Bluegiga A Silicon Labs Company 21 6 5 Measured 2D radiation patterns Typical radiation patters of the BT121 module shown as 2D plots are shown below in Figure 12 view from module side Figure 13 view from antenna end and on the following page in Figure 14 view from above module deg Legend 24060 00 MHz 2440 D MH z 7480 O0D MH z 2f deq S deg 18 deg Figure 12 Typical 2D radiation pattern for BT121 with view from module side deo HHHH Legend _ 2400 D0 h Hz F a e E 2440 00 MHz oe 480 DO MH z s E T EN 2704 S deg 190deg Figure 13 Typical 2D radiation pattern for BT121 with view from antenna end side Bluegiga A Silicon
7. BT121 BLUETOOTH SMART READY MODULE DATA SHEET Wednesday 13 May 2015 Document Version 1 2 A Silicon Labs Company Copyright O Silicon Labs All rights reserved Silicon Labs assumes no liability or responsibility for any errors mistakes or inaccuracies in content Silicon Labs reserves the right to change products or specifications without notice and does not make any commitment to update the information herein Silicon Labs products are not authorized for use as critical components in life support devices or systems BGScript is a trademark of Silicon Labs The Bluetooth word mark and logos are registered trademarks owned by the Bluetooth SIG Inc USA All other trademarks and trade names listed herein belong to their respective owners Information is subject to change without notice Bluegiga A Silicon Labs Company VERSION HISTORY Date Edited Comment First release of document Bluegiga A Silicon Labs Company TABLE OF CONTENTS 1 BT121 overview 1 1 1 2 1 3 Key Features Typical applications Block diagram 2 Design guidelines 2 1 2 2 2 3 2 4 PCB layout recommendations Power supply recommendations Software application related options Firmware updating related recommendations 3 Pin out description 3 1 3 2 Power ground reset RF and boot loader pins GPIO pins 4 Power control 4 1 4 2 4 3 4 4 4 5 Power supply requirements Power saving functionality Reset
8. Canada authorizations are no longer considered valid and the FCC ID and IC Certification Number cannot 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 FCC and Industry Canada authorization End Product Labeling The BT121 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 the 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 121 Contains Transmitter Module IC 5123A BGTBT121 Or Contains FCC ID QOQBT121 Contains IC 5123A BGTBT121 The OEM integrator has to be aware not to provide information to the end 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 transmitter must be installed such that a minimum separation distance of 15 mm FCC 20 mm IC is maintained between the radiator antenna and all persons at all times and must not be co located or operating in conjunction with any othe
9. Labs Company 22 Legend 2400 00 MHz 2440 00 MHz 480 00 MH z 2fUdeg 90deg 180deg Figure 14 Typical 2D radiation pattern for BT121 with view from above module Bluegiga A Silicon Labs Company 23 6 6 Measured 3D radiation patterns Typical radiation patters of the BT121 module shown as 3D plots are shown below Figure 15 represents a radiation pattern from module end side opposite to antenna and Figure 16 from above the module Figure 15 Typical 3D radiation pattern for BT121 with view from module end opposite to antenna Figure 16 Typical 3D radiation pattern for BT121 with view from above the module Bluegiga A Silicon Labs Company 24 7 Bluetooth Stack Software Bluegiga s Bluetooth Smart Ready Software is a complete Bluetooth Smart Ready software stack for BT121 Bluetooth Smart Ready module The software implements a full Bluetooth BR EDR and LE compatible Bluetooth Stack and L2CAP RFCOMM SMP and ATT protocols as well as Bluetooth SPP Apple iAP2 GATT over BT profiles and any GATT based Bluetooth Smart profile The Bluetooth Smart Ready Software also is supported by a complete SDK for developing Bluetooth Smart Ready applications using either an external host or BGAPI M serial protocol over UART or fully standalone applications based on a simple scripting language called BGScript Several profiles and software project examples are offered as part of the Bluetooth Smart Ready SDK to hel
10. OM memory peripheral chip is connected to the BT121 using the SPI 1 Alt 2 option 3V3 3V3 t 2 3 VDD 4 NC GENERIC EEPROM WITH SPI INTERFACE 5 RX 6 TX 7 RTS 8 CTS 9 NC 10 RESERVED FOR GND PRODUCTION PROGRAMMING OPTIONAL CONNECTOR ON APPLICATION PCB ALLOWS CONTROL AND REFLASH OF MODULE FOR EXAMPLE FROM A PC 14 15 16 17 18 19 20 BT121 CONNECTED TO USE SPI 1 AIt 2 PB3 SCK PB4 MISO PB5 MOSI PB8 CS OUT Figure 19 Connecting an external device with BT121 using SPI interface Bluegiga A Silicon Labs Company 28 9 3 Connecting an external device using I C interface Bluegiga Bluetooth Smart Ready module BT121 contains two physical peripherals 12 1 and 2 FC 1 has two alternatives Alt 1 and Alt 2 and I C 2 one alternative Alt 2 All of the three optional configurations can be used to connect different types of peripheral devices with the module Pin configurations for the three EC interface options are listed in Table 2 An example of this type of interfacing is shown in Figure 20 below Note the pull up resistors on the SDA and SCK lines The example shows the address chip select lines of the generic peripherals hardwired to VDD but in practice all or some of them would be wired to GPIO pins of the BT121 configured to work as chip select or address lines controlled by the application hardware In the example below a generic sensor chip is connected to the BT121 using the 1 Alt 1 o
11. Script it can be used as an application UART The UART supports all standard baud rates up to 4 Mbps RTS CTS handshake scheme is supported and recommended for every application for reliable data transfer 5 3 BT121 has up to two C ports available Both support standard mode up to 100 kbps fast modes up to 400 kbps and Fast Mode Plus with improved drive capability and clock stretching up to 1 Mbps 5 4 SPI BT121 has up to two SPI ports available Both can be configured for frame sizes from 4 to 16 bits and clock frequencies up to 18 MHz Both ports provide internal CRC calculation An optional slave select signal NSS is provided for hardware assisted data strobing in applications requiring high bus throughputs 5 5 ADC BT121 contains a 4 channel 12 bit ADC with multiple external input sources as well as an internal battery measurement and temperature measurement possibility ADC input voltage range is 0 to VDD 5 5 1 Accessory functions of the ADC In addition to the external ADC inputs an internal temperature sensor or internal supply voltage divider can be selected as the input to ADC Power supply range when using internal ADC functions is 2 4 to 3 6 VDC 5 6 DAC BT121 contains a 2 channel 12 bit DAC with two independent outputs DAC output voltage range is O to VDD D Power supply range when using internal DAC functions is 2 4 to 3 6 VDC 5 Real time clock BT121 contains a real time clock RTC wit
12. ard which has a central cutout On the following pages are examples on how plastic or metal sheets in several different orientations and distances to the antenna effect antenna matching Bluegiga A Silicon Labs Company 17 6 1 Effect on antenna matching of a plastic sheet placed near the antenna As an example on how a plastic sheet placed in the vicinity of the module and or antenna effect the antenna matching we can examine Figure 8 below BT121 BT121 oplication Application Plastic sheet 3mm Blue curve Violet curve Plastic sheet under antenna touching PCB Plastic sheet against antenna at module end BT121 ADD cation PLE Plastic sheet 3mm Yellow curve Plastic sheets under antenna touching PCB and against antenna at module end Figure 8 Proximity effect of a 3 mm plastic sheet on antenna matching with different placements Bluegiga A Silicon Labs Company 18 6 2 Effect on antenna matching of a metal sheet placed under the antenna As an example on how a metal sheet placed in the vicinity of the module and or antenna effect the antenna matching we can examine Figure 9 below BT121 BT121 Application PCB 1mm Application PCB 222222222 Violet curve Blue curve Metal sheet under antenna touching PCB Same as on the left but distance is 1 mm Figure 9 Effect of a metal sheet placed under the antenna on antenna matching Bluegiga A Silicon Labs Company
13. ate without clocks and instant communications with the host are not possible A separate wake up command on the host UART or a PIO interrupt can be used to wake up the module or an RTC event The radio can also cause a wake up event There is a short wake up delay due to the time required for the internal clocks to stabilize and because of this the module processor is not instantly ready to receive data The radio part of the BT121 can be physically shut down with software to reduce module sleep consumption to the minimum This can be useful when the application only needs to connect to a remote system periodically Powering the radio up again will require a re initialization of the radio which will cause a relatively long delay See Table 3 on next page Bluegiga A Silicon Labs Company 12 consumption Power mode 2 Powered off 50 100 UA 500 ms Powered off Off 5 10 pA Until radio is on again Table 3 Power modes with corresponding wakeup delays and current consumption clocks core delay Stopped Power mode CPU CPU Radio UART Current Active Power mode 2 RF OFF Current consumption with radio inactive The logic flow of the power saving modes in relation to each other is shown in Figure 5 below It is to be noted that the processor will not lose RAM contents regardless of the power mode used Active Wake on any interrupt Wake up delay 7 us Delay 0 us Always when CPU idle Wake on PIO
14. eady module BT121 is shown in below BT121MODULE Micro controller 128 kB Flash Bluetooth 4 0 Smart Ready 28 kB Flas Chipset 48 MHz Cortex MO Timers Processor core Generator 2 1 16 kB SRAM 2 2 RTC Calendar GPIO 12 bit 12 bit ADC DAC Figure 1 BT121 Bluetooth Smart Ready module block diagram Bluegiga A Silicon Labs Company 7 2 Design guidelines Certain hardware related design guidelines should always be followed when developing applications based on the BT121 module 2 1 PCB layout recommendations e All ground pads should be connected to a ground plane he antenna layout should follow the example shown in Figure 2 below and avoid the designs shown as crossed over BT121 requires minimal free space around the module and only the white area marked in the PCB picture series presented in Figure 2 below needs to be free of copper and components la gt 20mm gt TNI E 0000001 nini IU Figure 2 PCB layout recommendations for BT121 application boards 2 2 Power supply recommendations The regulator used must be capable of supplying a peak current of 150 mA and the regulator must be of a type stable with ceramic capacitors 2 3 Software application related options BT121 can be used either as a stand alone solution by using the Bluegiga BGScript scripting language or alternatively if the application software size or o
15. elles exigences compl mentaires lorsque le module est install exemple missions provenant d appareils num riques exigences vis vis de p riph riques informatiques etc IMPORTANT Dans le cas ou 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 num ros d identification de la FCC et de certification d Industrie Canada ne peuvent servir pour le produit final Dans ces circonstances il incombera l int grateur de faire r valuer le produit final comprenant le transmetteur et d obtenir une autorisation s par e de la part de la FCC et d Industrie Canada Etiquetage du produit final Chaque module BT121 poss de sa propre identification FCC et son propre num ro de certification IC Si l identification FCC et le num ro de certification IC ne sont pas visibles lorsqu un module est install a l int rieur d un autre appareil alors l appareil en question devra lui aussi pr senter une tiquette faisant Bluegiga A Silicon Labs Company 43 r f rence au module inclus Dans ce cas le produit final doit comporter une tiquette plac e de facon visible affichant les mentions suivantes Contient un module transmetteur certifi FCC QOQBT121 Contient un module transmetteur certifi IC 5123A BGTBT121 OU Inclut la certification FCC QOQBT121 Inclut
16. h full calendar support and sub second resolution The RTC can be used for periodic or specifically programmed wakeups The RTC is clocked by an internal crystal oscillator which is always on as long as power is supplied to the module 5 8 Microcontroller programming interface The preferred method of programming the BT121 is by using the Bluegiga DFU through the UART host interface A problem may occur if the DFU is disabled by disabling the UART or if the DFU is overwritten accidentally Then the DFU would need to be re uploaded The two methods of firmware upload are through the SWDIO SWCLK interface PA13 and PA14 using an ARM serial debug adapter or by forcing the BOOTO signal high and by resetting the module to make it boot into a recovery mode Then the BGTool software can be used to recover the DFU through the UART interface Bluegiga A Silicon Labs Company 16 6 Antenna The internal chip antenna on the BT121 uses the application board ground plane as part of the antenna and requires at least 20 mm of ground plane on both sides of the module to radiate with optimal efficiency BT121 must be placed on the application board edge preferably roughly in the middle of the board edge The ground plane can be internal to the application PCB allowing components to be placed on both sides of the module and on both sides of the application board The module ground pads in the antenna end should be connected to the main ground plane layer with
17. he power supply feed to the BT121 is not switched off but instead the module can be set into the lowest power mode providing the smallest current consumption Bluegiga A Silicon Labs Company 14 5 Interfaces 5 1 GPIO BT121 contains a number of pins which can be configured to operate as general purpose digital l O s analog inputs or outputs or to be used in combination with various built in functions The module contains 2 SPI UART touch pad sensing and various timer functions Most of the pins are 5V tolerant All GPIO pins can drive currents of up to 8 mA up to 20mA with relaxed voltage specifications 5 1 1 GPIO interrupts Any GPIO signal can be assigned an interrupt function However the module microcontroller has a limited number of interrupt channels available for GPIO s The microcontroller has two separate GPIO ports with the external signals divided between the two An interrupt can be assigned to a specific port signal number from either port but not for the same number on both ports simultaneously The principle of GPIO interrupt multiplexing on the Bluegiga B uetooth Smart Ready module BT121 is shown in Figure 6 below Q Interrupt 3 Disable Interrupt 4 Disable O Interrupt 15 PB15 Figure 6 GPIO interrupt multiplexing scheme Bluegiga A Silicon Labs Company 15 5 2 UART There is one UART port available on the BT121 By default it is used for BGAPI host interface but with BG
18. iption Section 5 4 GPIO pins 36 37 38 and 39 Default pin functions on production firmware dc disconnected no need to pull up or down Reserved for production testing UART can be used as a BGAPI host interface and DFU firmware updates Must be left unconnected If the pins are set as GPIO rather than UART signals the DFU cannot work see UART Section 5 2 and recovery mode Section 4 4 2 2 cannot be used in Alt 2 configuration 2 Bluegiga Silicon Labs Company 11 4 Power control 4 1 Power supply requirements BT121 is powered by a single power supply input VDD Nominal input voltage is 3 3 VDC and input voltage range 2 2 V to 3 6 V If the module s internal ADC and or DAC functions are used minimum allowed power supply voltage is 2 4V The VDD supply should be capable of supplying a peak current of at least 150 mA even though the average current consumption of BT121 will be much less than that External high frequency bypass capacitors are not needed because the module contains the necessary power supply filtering capacitors Careful design of the layout and proper component selection are necessary to prevent switching noise from appearing on the supply line Such disturbances can be caused by on board charge pump converters e g RS232 level shifters Charge pump based converters tend to have strong switching spikes which are difficult to filter out and may degrade RF performance A ferrite chip can be added i
19. la certification IC 5123A BGTBT121 L int grateur est tenu de ne fournir aucune information a l utilisateur final autorisant ce dernier installer ou retirer le module RF ou bien changer les parametres RF du module dans le manuel d utilisation du produit final Afin de se conformer aux limites de radiation impos es par la FCC et Industry Canada l antenne ou les antennes utilis e pour ce transmetteur doit tre install e de telle sorte maintenir une distance minimum 15 mm FCC 20 mm IC tout instant entre la source de radiation l antenne et les personnes physiques En outre cette antenne ne devra en aucun cas tre install e ou utilis e en concomitance avec une autre antenne ou un autre transmetteur Bluegiga A Silicon Labs Company 44 16 Ordering information Product code Description BT121 A V1 BT121 Bluetooth Smart Ready module with an integrated antenna BT121 A V1 iAP BT121 Bluetooth Smart Ready module with an integrated antenna and Apple IAP profile This part number is only available to Apple MFI licenses DKBT Bluegiga Bluetooth Smart Ready Development kit Bluegiga A Silicon Labs Company 45 17 Contact Information Sales Technical Support Orders WWW SILICON LABS FINLAND OFFICE www bluegiga com www bluegiga com support bluegiga orders silabs com www bluegiga com Phone 1 877 444 3032 400 West Cesar Chavez Austin TX 78701 USA Phone 358 9 435 5060 Fax 358
20. 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 or 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 necessary for successful communication OEM Responsibilities to comply with FCC and Industry Canada Regulations The BT121 Module has been certified for integration into products only by OEM integrators under the following conditions e he antenna s must be installed such that a minimum separation distance of 15 mm FCC 20 mm IC is maintained between the radiator antenna and all persons at all times e The transmitter module must not be co located or operating in conjunction with any other antenna or transmitter Bluegiga A Silicon Labs Company 41 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 example digital device emissions PC peripheral requirements etc IMPORTANT NOTE In the event that these conditions cannot be met for certain configurations or co location with another transmitter then the FCC and Industry
21. n series with the supply line close to the module supply pin to reduce HF interference through the supply line There is a total of about 1 5 uF of ceramic capacitors on the VDD line inside the module When using low drop linear regulators to generate a regulated supply voltage for the VDD line the stability of the regulator with the low ESR provided by these capacitors should be checked Many linear regulators and some switched mode ones too are not stable when used with ceramic output capacitors The regulator datasheets usually have recommendations for output capacitor ESR range or they contain a stability curve to help select components properly A regulator designated as stable with ceramic capacitors is recommended 4 2 Power saving functionality BT121 contains two configurable power saving modes The internal RTC Real Time Clock is usually kept always running to avoid the long wake up time associated with the internal 32 kHz crystal oscillator The RTC is always available to wake up the module 4 2 1 Power mode 1 Power mode 1 is a shallow sleep state with all clocks and peripherals running but with the processor core stopped It is used automatically and has no impact on module performance and does not require special considerations in user applications See Table 3 on next page 4 2 2 Power mode 2 Power mode 2 is a deep sleep state in which most peripheral devices and system clocks are powered down The UART interfaces cannot oper
22. ns BT121 compliance certifications are pending 15 1 CE BT121 is in conformity with the essential requirements and other relevant requirements of the R amp TTE Directive 1999 5 EC The product is conformity with the following standards and or normative documents e EMC immunity only EN 301 489 17 V 1 3 2 in accordance with EN 301 489 1 V1 8 1 e Radiated emissions EN 300 328 V1 8 1 15 2 FCC and IC This device complies with Part 15 of the FCC Rules Operation is subject to the following two conditions 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 complies 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 other antenna or transmitter This transmitter is considered as mobile device and should not be used closer than 15 mm from a human body Please contact www bluegiga com for detailed information IC Statements This device complies with Industry Canada license exempt RSS standard s Operation is subject to the following two conditions 1 this device may not cause interference and 2 this device must accept any interference including interference that
23. ons Module width 11 0mm Antenna clearance width 7 5mm Ss 1 75mm mx Pod center lo edge 0 99mm M Antenna clearance depth 3 4mm o Pod pitch 1 0mm Module length 13 9mm Pad width 0 7mm T bot LE Copper to edge 0 4mm V ll Al S width 1 0mm Pad center to edge 2 5mm Pad center to edge 0 95mm Figure 21 BT121 module physical dimensions Pad center lo center 10 2mm Pad length 2 0mm amp Cenler to edge 0 95mm Pod pitch 1 0mm Pod width 0 7mm Center to edge 0 95mm I Center to edge 0 4mm Center to edge 2 5mm amp I Length of pad under module 1 4mm S Figure 22 BT121 module recommended PCB pad pattern unsoldered but despite of this unmasked traces and vias should NOT be placed under the module The 8 center pins of the module are reserved for production programming and should be left in order to prevent short circuits Bluegiga A Silicon Labs Company 35 Module height with EMC shield 2 2mm PCB thickness 1 0mm Antenna Module height with onlenno 2 0mm 15 9mm A Figure 23 BT121 module side view dimensions Bluegiga A Silicon Labs Company 36 13 Soldering recommendations Bluegiga Bluetooth Smart Ready module BT121 is compatible with the industrial standard reflow profile for Pb free solders The reflow profile to be used depends on the thermal mass of the entire populated application PCB heat
24. p expedite the development of Bluetooth Smart Ready compatible end user products The main parts of the Bluegiga Bluetooth Smart Ready software stack are shown below Bluetooth Smart Ready Module Optional host BGScript application Application Bluegiga BGLIB Bluegiga BGScript VM parser Bluegiga BGAPI Figure 17 Bluegiga Bluetooth Smart Ready software stack To learn more about the Bluetooth Smart Ready software stack the SDK and the APIs please read Bluetooth Smart Ready Software Getting Started Guide Bluegiga A Silicon Labs Company 25 8 Host interface 8 1 UART For applications where an external host such as MCU is used BT121 can be controlled over the UART interface using the BGAPI serial protocol For reliable communications can data transfer the hardware flow control RTS CTS signals must be used in the UART interface It is also recommended that the accuracy of the clock of the controlling host should be 196 or better for the UART signaling to work reliably with speeds exceeding 115200 kbps maximum baud rate is 4 Mbps Default UART settings are listed below Parameter Default setting UART baud rate 115200 RTS CTS flow Enabled control Parity Stop bits Table 4 BT121 UART interface default settings Bluegiga A Silicon Labs Company 26 9 Connection examples The following sections show how to connect a Bluegiga B uetooth Smart Ready module with various e
25. ption 3V3 3V3 GENERIC PERIPHERAL WITH FC INTERFACE wont CO were MW HM 10 4 RESERVED FOR PRODUCTION PROGRAMMING OPTIONAL CONNECTOR ON APPLICATION PCB ALLOWS CONTROL AND REFLASH OF MODULE FOR EXAMPLE FROM A PC 14 15 16 17 18 19 20 Rus 4 7 kohm 50 V 0 083 W BT121 CONNECTED TO USE ADDRESS CHIP SELECT LINES OF THE PERIPHERAL COULD I2C 1 Alt 1 ALSO BE WIRED TO SELECTED GPIO PINS CONFIGURED AS OUTPUTS TO ALLOW ADDRESSING SEVERAL PERIPHERALS PB6 SCL PB7 SDA Figure 20 Connecting to an 2 peripheral Bluegiga A Silicon Labs Company 29 10 Electrical characteristics 10 1 Absolute maximum ratings Parameter Storage temperature Table 5 Absolute maximum ratings 10 2 Recommended operating conditions Rating Mi Operating temperature range aar vo 0 2 4 VDD when operating ADC or DAC Table 6 Recommend operating conditions Bluegiga A Silicon Labs Company 30 10 3Logic signal characteristics 10 3 1 Digital I O Digital I O pins Min Typ Max Input voltage levels Vit input logic level low 1 7V lt VDD s 3 6V 0 3VDD V DOCTEUR vo output logic level high Vdd 3 6 V loh 12 mA VDD 04 0 00 VOD V Table 7 Digital I O pin electrical characteristics 10 3 2 Reset Power on Reset Power on reset threshold rising edge 1 84 Power on reset threshold falling edge 1 80 10 3 3 ADC Power on Reset ADC input impedance ADC inpu
26. quelle qu elle soit y compris les interf rences susceptibles d entrainer un fonctionnement non requis de l appareil Selon la r glementation d Industrie Canada ce radio transmetteur ne peut utiliser qu un seul type d antenne et ne doit pas d passer la limite de gain autoris e par Industrie Canada pour les transmetteurs Afin de r duire les interf rences potentielles avec d autres utilisateurs le type d antenne et son gain devront tre d finis de telle fa on que la puissance isotrope rayonnante quivalente EIRP soit juste suffisante pour permettre une bonne communication Les responsabilit s de l int grateur afin de satisfaire aux r glementations de la FCC et d Industrie Canada Les modules BT121 ont t certifi s pour entrer dans la fabrication de produits exclusivement r alis s par des int grateurs dans les conditions suivantes antenne ou les antennes doit tre install e de facon maintenir a tout instant une distance minimum de 15 mm FCC 20 mm IC entre la source de radiation l antenne et toute personne physique Le module transmetteur ne doit pas tre install ou utilis en concomitance avec une autre antenne ou un autre transmetteur Tant que ces deux conditions sont r unies il n est pas n cessaire de proc der des tests suppl mentaires sur le transmetteur Cependant l int grateur est responsable des tests effectu s sur le produit final afin de se mettre en conformit avec d ventu
27. r antenna or transmitter Bluegiga A Silicon Labs Company 42 15 2 1 FCC et IC Cet appareil est conforme l alin a 15 des r gles de la FCC Deux conditions sont respecter lors de son utilisation 1 cet appareil ne doit pas cr er d interf rence susceptible de causer un quelconque dommage et 2 cet appareil doit accepter toute interf rence quelle qu elle soit y compris les interf rences susceptibles d entrainer un fonctionnement non requis D claration de conformit FCC d exposition aux radiofr quences RF Ce mat riel respecte les limites d exposition aux radiofr quences fix es par la FCC dans un environnement non contr l Les utilisateurs finaux doivent se conformer aux instructions d utilisation sp cifi es afin de satisfaire aux normes d exposition en mati re de radiofr quence 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 15 mm FCC 20 mm IC du corps humain Pour des informations d taill es veuillez contacter le support technique Bluegiga www bluegiga com D claration de conformit IC Ce mat riel respecte les standards RSS exempt de licence d Industrie Canada Son utilisation est soumise aux deux conditions suivantes 1 l appareil ne doit causer aucune interf rence et 2 l appareil doit accepter toute interf rence
28. rd These phenomena can in some cases cause problems Bluegiga A Silicon Labs Company 37 13 1 Soldering profile example As an example of a typical soldering profile please see an example of a generic example of a reflow profile shown below As stated in previous section soldering profiles are solder paste specific Consult the manufacturer of the paste used Celsius Figure 24 Reference reflow profile example Bluegiga A Silicon Labs Company 38 14 Tape and reel packaging This section contains information regarding the tape and reel packaging and materials of packaging with dimensions for the Bluegiga Bluetooth Smart Ready BT121 module 14 1 Reel material and dimensions e Reel material PS Conductive Black surface resistance 103 105 e Reel diameter 13 e Reel color Black Symbol Dimensions mm ES Di Table 16 Reel dimensions 14 2Tape material and dimensions e ape material PS Conductive Black surface resistance 103 105 Symbol Dimensions mm SIDE A e e SIDE B Table 17 Tape dimensions Bluegiga A Silicon Labs Company 39 14 3Tape and reel box dimensions NE N Table 18 Tape and reel box dimensions 14 4 Module orientation in tape MODULE ORIENTATION IN TAPE NN gt User Direction of Feed Figure 25 Module orientation in tape and feed direction Bluegiga A Silicon Labs Company 40 15 Certificatio
29. t pins Ground pin These are all connected together internally but they should all be individually GND connected directly to a solid ground plane with vias in close proximity to the pins This requirement concerns especially the antenna connections 1 2 3 13 21 31 32 33 41 Module reset signal pins Pulling RESET low will reset the internal processor of the module These connections have an internal pull up and can be left floating if not needed Boot mode pin of the microcontroller internal boot loader This connection has an internal pull down and should be left floating or pulled low in normal operation If the Bluegiga DFU is overwritten or disabled pulling BOOTO high at reset will allow DFU to be rewritten through the UART serial port interface Table 1 Power ground reset RF and boot loader pins Bluegiga A Silicon Labs Company 10 3 2 GPIO pins General purpose pins and their functions are listed below PERIPHERAL GPIO NAME FUNCTION PB5 PB6 PB7 PB8 PB9 PB10 12 Pet PAo BAS 26 27 28 29 ENRERERESESERES c ss ovo RTS CTS RX TX MOSI _ 1 _ wo wos mso mosi TJ RE S S a o gd Y D Q TIRI d EEL ES el Q Table 2 General purpose 1 0 pins and their functions NSS signal is optional see SPI descr
30. t voltage range Table 9 ADC pin characteristics Bluegiga A Silicon Labs Company 31 10 3 4 DAC Power on Reset Table 10 DAC pin characteristics Bluegiga A Silicon Labs Company 32 10 3 5 Power consumption Operation state Current Unit Description CPU active RF idle HF sleep current Power state 1 RF idle Teo me 1 HF sleep current Power state 2 RF idle CPU consumption HF sleep current Reset state Continuous transmission BDR CPU consumption HF fully on Continuous transmission EDR 8 CPU consumption HF fully on Table 11 Power consumption of different operating schemes CPU leakage current only Power state 2 RF off RF fully powered off Bluegiga A Silicon Labs Company 33 11 RF Characteristics 11 1 Supported frequencies and channels Parameter Min Max Unit cme jo Table 12 Supported frequencies and channels 11 2 Typical receiver sensitivity Packet type 40 to 85 C Unit dBm Table 13 Typical receiver sensitivity 11 3 Transmitter output power Modulation type Min Typ EDR 2 3 Mbps 7 Table 14 Transmitter output power at maximum setting 11 4 Carrier frequency accuracy Parameter Bluetooth limit Unit total error Variation between individual units ppm Variation with temperature 40 to 85 C 29 0 ppm Table 15 Carrier frequency accuracy Bluegiga A Silicon Labs Company 34 12 Physical dimensi
31. ther factors require together with an external host processor by using Bluegiga BGAPI commands The decision on which approach to use is most often dictated by the limits set by the internal memory of the BT121 module 2 4 Firmware updating related recommendations To enable firmware updating an external UART interface connection as shown in Figure 3 on the next page is mandatory BT121 firmware can be updated through the UART interface by holding the host MCU in reset state which typically will free the UART lines to be used by the update interface Bluegiga A Silicon Labs Company 8 REGULATOR VOUT VIN VDD UART TX UART RX UART RX UART IX FW Update UART CTS UART RTS E Interface UART RTS B UART cts RESET HOST MCU RESET optional Figure 3 BT121 firmware update via UART connection example Bluegiga A Silicon Labs Company 3 Pin out description This section contains a description of the BT121 pin out Each pin may have one or more functions which are all listed in tables The pin out is shown in Figure 4 below VDD PA11 PA12 PA10 PAS RESET GND RESERVED FOR PRODUCTION PROGRAMMING 14 15 16 17 18 19 Figure 4 BT121 pin out top view 3 1 Power ground reset RF and boot loader pins Power supply ground reset signal RF antenna input output and boot loader related pins are listed in Table 7 below Pin Pad Function Description 000000000000 30 34 VDD Module power supply inpu
32. transfer efficiency of the oven and on the particular type of solder paste used Consult the datasheet of the particular solder paste used for more detailed information regarding profile configurations The following recommendations for soldering the module are to ensure reliable solder joints and operation of the module after soldering Since the soldering profile used is process and layout dependent the optimum profile should be studied and decided case by case The following recommendation should be taken only as a starting point and should be adjusted according to more detailed instructions of the solder paste and soldering equipment manufacturers Check the recommended soldering profile configuration from the solder paste manufacturers documentation Avoid using more than one flow Reliability of the solder joints and self alignment of the component are dependent on the solder volume A minimum stencil thickness of 150 um is recommended Aperture size of the stencil should be 1 1 with the pad size A low residue no clean solder paste should be used due to the low mounted height of the module If the vias used on the application board have a diameter larger than 0 3 mm it is recommended to mask the via holes at the module side to prevent solder wicking through the via holes Solders have a habit of filling holes and leaving voids in the thermal pad solder junction as well as forming solder balls on the other side of the application boa
33. vias in immediate proximity of the pins Thermal reliefs on the ground pins have a negligible effect on antenna performance Typical antenna matching curves are shown in Figure 7 below Violet curve with thermal reliefs Figure 7 Typical antenna matching The antenna used on the BT121 is quite robust with regard to adverse effects of close by metallic materials The PCB thickness will not affect the antenna operation significantly The application board can be installed with the PCB bottom side and the antenna edge directly against a plastic casing without adverse effects On the module top side there should be at least 3 mm of clearance to the nearest object The antenna requires a 7 5 x 3 4 mm sized copper clearance in all layers with no components or traces on the opposite side of the PCB from the antenna Sufficient metal clearance is mandatory because the antenna will not function at all without a sufficient opening in the ground plane Any metal in close proximity of the antenna will prevent the antenna from radiating freely It is recommended not to place any metal or other conductive objects closer than 10 mm to the antenna except in the directions of the application board ground planes A board cutout is not required for the antenna In fact a cutout would cause the antenna to be detuned which in turn will degrade range significantly The module is also not to be placed in a cut out recess on the board edge or in the middle of the bo
34. xternal devices using the UART SPI and FC interface 9 1 Connecting an external host using the UART interface The connection to an external host is done using the UART interface of the module This interface is also used for module reprogramming using the DFU method and thus an optional connector should be provided on the application PCB to allow reprogramming if needed A typical solution then is to hold the host in reset state which will keep the UART pins of the host floating allowing the interface to be used for programming the module by using e g a PC and suitable software See Figure 18 3V3 BT121 TOP VIEW EXTERNAL HOST MICROPROCESSOR RESERVED FOR PRODUCTION PROGRAMMING 14 15 16 17 18 19 20 GND NC RX TX RTS CTS RST VDD OPTIONAL CONNECTOR ON APPLICATION PCB ALLOWS CONTROL AND REFLASH OF MODULE FOR EXAMPLE FROM A PC Figure 18 Connecting an external host with BT121 using UART Bluegiga A Silicon Labs Company 27 9 2 Connecting an external device using SPI interface Bluegiga Bluetooth Smart Ready module BT121 contains two physical SPI peripherals SPI 1 and SPI2 each with alternative configurations Alt 1 and Alt 2 All of the four optional configurations can be used to connect different types of peripheral devices to the module Pin configurations for the four SPI interface options are listed in Table 2 An example of this type of interfacing is shown in Figure 19 below In the example below a generic EEPR
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