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www.rovingnetworks.com version 3.3 r 4/9/2012 1 rn - 41 - ds rn - 41 /rn - 41 - n class 1 bluetooth module features fully qualified bluetooth version 2.1 module, supports version 2.1 + enhanced data rate (edr) backwards - compatible with bluetooth v ersion 2.0, 1.2, and 1.1 postage stamp sized form factor , 13.4 mm x 25.8 mm x 2 mm low power (30 ma connected, < 10 ma sniff mode) uart (spp or hci) and usb (hci only) data connection interfaces sustained spp data rates : 240 kbps (slave), 300 kbps (master) hci data rates: 1.5 mbps sustained, 3.0 mbps burst in hci mode embedded bluetooth stack profiles included (requires no host stack): gap, sdp, rfcomm , and l2cap p rotocols, w ith spp and dun profile support bluetooth sig q ualified, e nd p roduct l isting castellated smt pads for easy and reliable pcb mounting class 1 high power amplifier with o n board ceramic rf chip antenna (rn - 41) or without antenna (rn - 41 - n) certifi cations: fcc , ics, ce environmentally friendly, rohs compliant applications cable replacement barcode scanners measurement and monitoring systems industrial sensors and controls medical devices asset tracking description the rn - 41 module is a small form factor, low power, class 1 bluetooth radio that is ideal for designers who want to add wireless capability to their products without spending significant time and money developing bluetooth - specific hardware and software . the rn - 41 supports multiple interface protocols, is simple to design in , and is fully certified, making it a complet e embedded bluetooth solution. with its high - performance, on - chip antenna and support for bluetooth edr , the rn - 41 delivers up to a 3 - mbps data rate for d istances up to 100 meters. the rn - 41 is also available without an antenna (rn - 41 - n). figure 1 . rn - 4 1 block diagram rf switch pa balun csr bluecore-04 external crystal flash memory vcc gnd gpio4 gpio5 gpio6 usb uart pcm RN-41
www.rovingnetworks.com version 3. 3 r 4/9/2012 2 rn - 41 - ds overview baud rate speeds: 1 , 200 bps up to 921 kbps, non - standa rd baud rates can be programmed class 1 radio, 330 (100 m) range , 15 dbm output transmitter , - 80 dbm typ ical receive sensitivity frequency 2 , 402 ~ 2 , 480 mhz fhss/gfsk modulation, 79 channels at 1 - mhz intervals secure communication , 128 - bit encryption error correction for guaranteed packet delivery configuration via the local uart and over - the - air rf auto - discovery/pairing does not require software configurat ion (supports instant cable replacement) auto - connect master, i / o pin (dtr) , and character - based trigg er modes the modules moisture sensitivity level (msl) is 1. table 1 shows the module s size and weight. table 1 . module size & weight paramet er rn - 41 rn - 41 - n units size 13.4 x 25.8 x 2 13.4 x 19 x 2 mm weight 0.055 0.020 oz. tables 2 through 5 provide detailed specifications for the module. table 2 . environmental conditions parameter value temperature range (operating) - 40 o c ~ 85 o c temperature range (storage) - 40 o c ~ 85 o c relative humidity (operating) 90% relative humidity (storage) 90% table 3 . electrical characteristics parameter min . typ. max. unit s supply voltage (dc) 3.0 3.3 3.6 v rx supply current 35 60 ma tx supply current 65 100 ma average p ower c onsumption standby/idle ( d efault s ettings) 25 ma connected ( n ormal m ode) 30 ma connected ( low - p ower sniff) 8 ma standby/idle ( deep s leep e nabled ) 250 2.5 ma
www.rovingnetworks.com version 3. 3 r 4/9/2012 3 rn - 41 - ds table 4 . radio characteristics parameter frequency (ghz) min . typ . max . bluetooth specification units sensitivity at 0.1% ber 2.402 - - 80 - 86 - 70 dbm 2.441 - - 80 - 86 dbm 2.480 - - 80 - 86 dbm rf transmit power 2.402 15.0 16.0 20 dbm 2.441 15.0 16.0 dbm 2.480 15.0 16.0 dbm initial carrier frequency tolerance 2.402 - 5 75 75 khz 2.441 - 5 75 khz 2.480 - 5 75 khz 20 - db b andwidth for m odulated c arrier - 900 1000 1000 khz drift (five slots p acket) - 15 - 40 khz drift rate - 13 - 20 khz ? f1 avg max imum modulation 2.402 140 165 175 > 140 khz 2.441 140 165 175 khz 2.480 140 165 175 khz ? f2 avg min imum modulation 2.402 140 190 - 115 khz 2.441 140 190 - khz 2.480 140 190 - khz table 5 . digital i/o characteristics 3.0 v vdd 3. 3 v min . typ. max. unit s input logic level low - 0.4 - +0.8 v input logic level high 0.7 vdd - vdd + 0.4 v output logic level low - - 0.2 v output logic level high vdd - 0.2 - - v all i/o pins (except reset) default to weak pull down +0.2 +1.0 +5.0 ua
www.rovingnetworks.com version 3. 3 r 4/9/2012 4 rn - 41 - ds figure 2 shows the pinout and table 6 describes the pins. figure 2 . rn - 41/rn - 41 - n pino ut table 6 . pin description pin name description default 1 gnd ground 2 spi _ mosi programming only no c onnect 3 g pio6 set bluetooth master ( high = auto - master mode) input to rn - 41with weak pulldown 4 g pio7 set b aud rate ( high = force 9,600, low = 115 k or firmware setting) input to rn - 41 with weak pulldown 5 reset active - low reset input to rn - 41 with 1k pullup 6 spi_clk programming only no connect 7 pcm _ clk pcm interface no connect 8 pcm_sync pcm interface no connect 9 pcm_in pcm interface no connect 10 pcm_out pcm interface no connect 11 vdd 3.3 - v regulated power input 12 gnd ground 13 uart_rx uart receive i nput input to rn - 41 14 uart_tx uart transmit output high level output from rn - 41 15 uart_rts uart rts, goes high to disable host transmitter low level output from rn - 41 16 uart_cts uart cts, if set high, it disables transmitter low level input to rn - 41 gnd spi_mosi gpio6 gpio7 reset spi_clock pcm_clk pcm_sync pcm_in pcm_out vdd gnd spi_miso spi_csb gpio4 gpio5 gpio3 gpio2 usb_d- usb_d+ uart_cts uart_rts uart_tx uart_rx 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 aio1 gnd gpio11 gpio10 gpio9 gpio8 gnd aio0 35 29 34 33 32 31 28 30 RN-41 top view gnd spi_mosi gpio6 gpio7 reset spi_clock pcm_clk pcm_sync pcm_in pcm_out vdd gnd spi_miso spi_csb gpio4 gpio5 gpio3 gpio2 usb_d- usb_d+ uart_cts uart_rts uart_tx uart_rx 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 aio1 gnd gpio11 gpio10 gpio9 gpio8 gnd aio0 35 29 34 33 32 31 28 30 RN-41-n top view
www.rovingnetworks.com version 3. 3 r 4/9/2012 5 rn - 41 - ds pin name description default 17 usb_d+ usb port 1.5 k pullup activated when usb port is ready (~500 ms after reset) 18 usb_d - usb port 19 g pio2 status, high when connected, low otherwise output from rn - 41 20 g pio3 auto discovery = high input to rn - 41 with weak pulldown 21 g pio5 status, toggles based on state, low on connect output from rn - 41 22 g pio4 set factory defaults input to rn - 41 with weak pulldown 23 spi_csb programming only no c onnect 24 spi_miso programming only no c onnect 25 - 27 nc rf pad, keep all traces and planes clear 28 - 29 gnd ground 30 aio0 optional analog input not u sed 31 g pio8 status (rf data rx/tx ) output from rn - 41 32 g pio9 i /o input to rn - 41 with weak pulldown 33 g pio10 i / o (remote dtr signal) input to rn - 41 with weak pulldown 34 g pio11 i / o (remote rts signal ) input to rn - 41 with weak pulldown 35 aio1 optional analog input not used figure 3 shows the modules physical dimensions. figure 3 . rn - 41/rn - 41 - n physical dimensions RN-41 RN-41-n
www.rovingnetworks.com version 3. 3 r 4/9/2012 6 rn - 41 - ds typical application schematic figure 4 shows a typical application schematic. figure 4 . application schematic
www.rovingnetworks.com version 3. 3 r 4/9/2012 7 rn - 41 - ds design concerns the following sections provide informa tion on designing with the rn - 4 1 module , including radio interference, factory reset , solder reflow profile , connection status, etc. reset c ircuit the rn - 41 contains a 1k pullup to vcc, and the reset polarity is active low . the modules reset pin has an optional power - on - reset circuit with a de lay , which should only be required if the input po wer supply has a very slow ramp or tends to bounce or h ave instability on power up. often a microcontroller or embedded cpu i / o is available to generate the reset once power is stable. if not, designers can use one of the many low - cost power supervisor chips currently available, such as the mcp809, mcp102/121, and torex xc61f. factory reset using gpio4 roving networks recommends that designers connect the gpio4 pi n to a switch, jumper, or res istor so it can be accessed. this pin can be used to reset the module to it s factory default settings, which is critical in situation s where the module has been mis configured. to re set the module to the f actory def aults, gpio4 should be high on power - up and the n toggle low, high, low, high with a 1 second wait between the transitions. connection status g pio5 is available to drive an led, and it blinks at various speeds to indicate s tatus ( see table 7 ) . g pio2 is an output that directl y reflects the connection sta te as shown in table 8 . table 7 . gpio5 status gpio5 status description toggle at 1 hz the module is discoverable and waiting for a connection. toggle at 10 hz the module is in command mode. high the module is connected to another device over bluetooth. table 8 . gpio2 status gpio2 status description high the module is connected to another device over bluetooth. low the module is not connected over bluetooth. hci mode roving networks offers the host controller interface (hci) mode in addition to the standard operational mode of its bluetooth modules (standard mode refers to the on - board stack running on the module). in hci mode, the on - board stack is bypassed and the mo dule is put in a state that runs the bluetooth baseband. the hci provides a command reference interface to the baseband controller and the link manager, and provides access to the hardware status and control registers. this interface provides a uniform met hod for accessing the bluetooth baseband capabilities.
www.rovingnetworks.com version 3. 3 r 4/9/2012 8 rn - 41 - ds in this mode, the bluetooth stack is no longer on - board the module. it is offloaded to the interfacing host processor. the bluetooth module is used as a radio, performing the lower level mac functionalities, while the application stack runs on the host processor. using the module in hci mode allows designers to implement profiles that are not natively supported on the bluetooth module. note: hci mode requires a separate firmware build that must be loaded into the module ? flash at the factory . i s not upgradeable in the field. roving networks offers hci mode in two hardware interfaces: hci over uart hci over usb hci over uart in this mode, the hardware interface between the host processor and the bluetooth module is the uart. you must interface the flow control signals between the host processor and the bluetooth module for the hci interface to work. failure to do so can cause the host processor and the bluetooth module to become out of sync a nd break the bluetooth link. hci over usb in this mode, the hardware interface between the host processor and the bluetooth module is the usb. in this architecture , the bluetooth module is the usb slave and the host processor is the usb host. using the usb interface offers the advantage of a faster data link between the bluetooth module and the host processor. with this architecture, it is possible to achieve bluetooths theoretical maximum throughput of 3 mpbs . us ing the spi bus to upgrade the flash memory while not required, this bus is very useful for configuring the bluetooth modules advanced parameters . the bus is required when upgrading the modules firmware. the typical application schematic shown in figure 4 shows a 6 - pin header that can be implement ed to gain access to this bus. a minimum - mode version might simply use the spi signals (4 pins) and obtain ground and vcc from elsewhere in the design. m inimizing radio interference when laying out the carrier board for the rn - 41 module , the areas under the antenna and shielding connections should not have surface traces, ground planes , or exposed vias ( s ee figure 5 ) . for optimal radio performance , the rn - 41 modules antenna end should protrude at least 5 mm beyond any metal enclosure.
www.rovingnetworks.com version 3. 3 r 4/9/2012 9 rn - 41 - ds figure 5 . minimizing radio interference because the rn - 41 - n does not contain an antenna, it does not carry regulatory approvals. if designers use roving networks recommended design, they can file for a permissible antenna change and use roving networks regulatory approvals. roving networks recommends the yageo chip antenn a for the rn - 41 - n module. for detailed information on this antenna , refer to the yageo chip antenna data sheet on the support page of the roving networks website at http://www.rovingnetworks.co m/support_overview . if designers choose to use an other antenna, they must go through the regulatory approval process. solder reflow profile the lead - f ree s older r eflow temperature and times are: temperature 230 c, 30 - 40 seconds, p eak 250 c maximum preheat temperature 165 15 c, 90 to 120 seconds time single pass, one t ime do not located any surface parts, surface traces, internal traces, or ground planes under the antenna area. 25.6 mm bottom view 1.5 mm 13.4 mm 1.5 mm 7.0 mm 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 10 19 18 17 16 15 14 13 35 29 34 33 32 31 28 30 do not locate vias or surface traces under shield connectors (1.5 mm square). 1.5 mm 1.5 mm
www.rovingnetworks.com version 3. 3 r 4/9/2012 10 rn - 41 - ds compliance informati on table 9 describe s the modules compliance information. table 9 . compliance information (rn - 41 only) category country standard radio usa fcc id: fcc cfr47 part 15 c, para 15.247 t9j - r41 - 1 europe en 300 328 - 1 en 300 328 - 2 2.4ghz canada ic canada id: ic rss - 210 low power comm. device 6514a - rn411 emc usa fcc cfr47 part 15 subclass b europe en 55022 class b radiated en61000 - 4 - 2 esd immunity en61000 - 4 - 3 radiated field en61000 - 4 - 6 rf immunity en61000 - 4 - 8 power magnetic immunity bluetooth listed b013180 environmental rohs rohs compliant ordering information table 10 provides ordering information. table 10 . ordering information part number description rn - 41 standard application firmware (spp/dun master and slave) . rn - 41 - h ci hci firmware (hci over h4 uart) . rn - 41 - u sb usb firmware (hci over usb port, slave device at 12 - mbps rate) . rn - 41 - hid hid firmware supporting hid device and spp profiles . rn - 41 - n standard application firmware (spp and dun) without antenna . rn - 41 - n - hci hci firmware (hci over h4 uart) without antenna . rn - 41 - n - usb usb firmware (hci over usb port, slave device at 12 - mbps rate) without antenna . rn - 41 - n - hid hid firmware supporting hid device and spp profiles without antenna . for other configurations, contact roving networks directly. go to http://www.rovingnetworks.com for current pricing and a list of distributors carrying roving networks products.
www.rovingnetworks.com version 3. 3 r 4/9/2012 11 rn - 41 - ds notes
www.rovingnetworks.com version 3. 3 r 4/9/2012 12 rn - 41 - ds roving networks, inc. 102 cooper court los gatos, ca 95032 +1 (408) 395 - 5300 www.rovingnetworks.com copyright 201 2 roving networks. all rights reserved. roving networks is a registered trademark of roving networks. apple inc., iphone, ipad, itunes, made for iphone are registered trademarks of apple comput er. roving networks reserves the right to make corrections, modifications, and other changes to its products, documentation and services at any time. customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. roving networks assumes no liability for applications assistance or customers product design. customers are responsible for their products and applications which use roving networks components. to minimize customer p roduct risks, customers should provide adequate design and operating safeguards. roving networks products are not authorized for use in safety - critical applications (such as life support) where a failure of the roving networks product would reasonably be expected to cause severe personal injury or death, unless officers of the parties have executed an agreement specifically governing such use.

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