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www.rovingnetworks.co m version 3.2 1 10/2/2012 1 rn - 171 - ds rn - 171 802.11 b/g wireless lan module features fcc/ce/ ic certified 2.4 - ghz ieee 802.11b/g transceiver small form factor: 1050 x 700 x 130 mil configurable transmit power: 0 to 10 dbm rf pad connector for antennas certified antennas: c hip antenna, 4 d ipole , pcb trace , and wire antenna ultra - low power: 4 - ua sleep, 38 - ma rx, 120 - ma tx at 0 dbm high throughput : 921 k bps tx, 500 kbps rx data rate with tcp/ip and wpa2 over uart, up to 2 mbps over spi slave 8 - mbit flash memory and 128 - kb ram 10 general - purpose d igital i/o pins 8 analog sensor interfaces real - time clock for wakeup and time stamping a ccepts 3.3 - v regulated power supply or 3 - v battery supports a d hoc and infrastructure networks c omplete on - board tcp/ip networking stack environmentally friendly: rohs compliant applications remote equipment monitoring telemetry industrial sensors and h ome a utomation controls home automation description the rn - 171 module is a complete , standalone tcp/ip wireless networking module. with its small form factor and extre mely low power consumption, the rn - 171 is perfect for mobile wireless applications such as asset monitoring, sensors , and portable battery operated devices. it incorporates a 2.4 - ghz radio, 32 - bit sparc processor, tcp/ip stack, real - time clock, crypto acce lerator, power management , and analog sensor interfaces. the module is preloaded with firmware to si mplify integration and minimize application development. in the simplest configuration , the hardware only requires four connections (pwr , tx , rx , and gnd) to create a wireless data connection. additionally, the analog sensor inputs can connect to a variety of sensors such as temperature , audio , motion , and acceleration . the ability to go into deep sleep mode and automatically scan and associate to an access point when awake makes the rn - 171 suitable for roaming applications. the rn - 171 also includes a built - in html client to post serial uart data or sensor data to a web server automatically . figure 1 . rn - 1 7 1 block diagram 128-kb ram 2.4-ghz radio 2.4-ghz pa crypto accelerator 32-bit cpu 802.11 b/g mac/phy adc 2-mb rom timers spi gpio sdio sensor interface 2-kb nvm pwr mgmt flash memory spi gpio uart vdd in vdd batt 2.4 ghz tx/rx trace for pcb antenna rn-171
www.rovingnetworks.com version 3.2 1 10/2/2012 2 rn - 171 overview host data rates up to 921 k bps tx, 500 kbps rx for the uart , up to 2 mbps over the spi slave intelligent, built - in power management with programmable wakeup real - time clock for time stamping, auto - sleep , and auto - wake up c onfiguration using simple ascii c ommands software controlled transmit power (0 to 10 dbm) for ultra - low - power applications memory : 128 - kb ram, 2 - mb rom, 2 - kb battery - backed memory, 8 - mbit f lash secure wi - fi authentication using wep - 128, wpa - psk (tkip), and wpa2 - psk (aes) built - in networki ng applications : dhcp, udp, dns, arp, icmp , tcp, and html client 802.11 power save and roaming functions castellated pads for reliable soldering the modules moisture sensitivity level (msl) is 1. the modules size and weight are: size 1.06 x 0.70 x 0.12 in ches (27 x 18 x 3.1 mm) weight 0.09 oz tables 1 through 5 provide detailed specifications for the module. table 1 . environmental conditions parameter rn - 171 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 2 . electrical characteristics (provisional) supply voltage min . typ. max. unit s supply v oltage (vbatt option) 3.0 3.3 3. 7 vdc digital i nput input logic high vih 2.3 vdc input logic low vil 1.0 vdc digital output d rive g pio 4, 5, 6, 7, 8 24 ma g pio 9, 10, 11, 12, 13 8 ma power c onsumption sleep 4 ua standby ( doze) - 15 - ma connected (idle, rx) 40 ma connected ( tx) * 0 dbm 120 ma 12 dbm 190 ma
www.rovingnetworks.com version 3.2 1 10/2/2012 3 rn - 171 table 3 . analog sensor inputs parameter value sensor 0, 1, 2, 3 wakeup detect ion threshold 500 mv ad sens or 0 - 7 measurement range 0 - 400 mv ( do not exceed 1.2 - v dc ) resolution 14 bits = 12uv accuracy 5% un - calibrated, .01% calibrated minimum conversion time 35 us (5 khz over wi - fi ) sensor power (pin 33) output resistance 3.3v 10 ohms, max imum current = 50 ma table 4 . radio characteristics parameter specifications frequency 2 , 402 ~ 2 , 480 mhz modulation 802.11b compatibility : dsss (cck - 11, cck - 5.5, dqpsk - 2, dbpsk - 1) 802.11g : ofdm (default) channel intervals 5 mhz channels 1 14 transmission rate (over the air) 1 11 mbps for 802.11b / 6 54 mbps for 802.11g receive sensitivity - 83 dbm typical output level ( c lass1) - 2 dbm to +12 dbm (configurable via software) table 5 . transmit power output power 802.11 b (2 mbps) current in ma note (1) 802.11 g (24 mbps) current in ma note (1) 0 120 135 2 130 150 4 170 190 6 175 200 8 180 210 10 185 225 12 190 240 note: 1. measured at 3.3 - v dc vcc. the power consumption is the average power, active during actual power consumption .
www.rovingnetworks.com version 3.2 1 10/2/2012 4 rn - 171 typical application schematic figure 2 shows a typical application schematic with a battery boost circuit ; figure 3 shows a typical schematic with a linear regulator. figure 2 . application schematic with battery boost circuit
www.rovingnetworks.com version 3.2 1 10/2/2012 5 rn - 171 figure 3 . typical application circuit with linear regulator figure 4 shows the pin pads and table 6 describes the pins. figure 4 . pin pads 48 49 28 29 30 31 33 34 32 21 22 23 24 25 26 27 top view 35 37 39 41 43 45 36 38 42 40 44 46 47 20 19 18 17 15 14 16 13 11 9 7 5 3 12 10 6 842 1
www.rovingnetworks.com version 3.2 1 10/2/2012 6 rn - 171 table 6 . pin description pad number signal nam e description optional function direction note (1) 1 gnd ground . - 2 unused do not connect . no connect 3 unused do not connect . no connect 4 gpio 9 enable a d hoc mode, r estore factory defaults, 8 ma drive, 3.3 - v tolerant . i/o 5 gpio 8 gpio, 24 - ma dr ive, 3.3 - v tolerant . the rn - 171 drive s gpio8 high on powerup, which ov errides software configured powerup value s, such as set sys value 0x0000 on gpio8 . i/o 6 gpio 7 gpio, 24 - ma drive, 3.3 - v tolerant . i/o 7 gpio 6 gpio, 24 - ma drive, 3.3 - v tolerant, c onne ction status on roving networks f irmware . status of access point association i/o 8 gpio 5 gpio, 24 - ma drive, 3.3 - v tolerant . data tx/rx status i/o 9 gpio 4 gpio, 24 - ma drive, 3.3 - v tolerant . connected over tcp status i/o 10 vdd_3.3v 3.3 - v p ower s upply . 11 gpio 3 gpio, 8 - ma drive, 3.3 - v tolerant . i/o 12 gpi o 2 gpio, 8 - ma drive, 3.3 - v tolerant . i/o 13 gpio 1 gpio, 8 - ma drive, 3.3 - v tolerant . i/o 14 gnd ground . - 15 unused do not connect . no connect 16 unused do not connect . no connect 17 unused do not connect . no connect 18 unused do not connect . no connect 19 unused do not connect . no connect 20 gnd ground . - 21, 22, 23 gnd ground . - 24 antenna 802.11b/g 2.4 - ghz antenna . - 25, 26, 27 gnd ground . - 28 gnd ground . - 29 sensor 0 (2) , (3) sensor i nterface, a nalog input to module, 1.2 - v tolerant . input 30 sensor 1 (2) , (3) sensor interface, analog input to module, 1.2 - v tolerant . input 31 sensor 2 (2) , (3) sensor interface, analog input to module, 1.2 - v tolerant . input 32 sensor 3 (2) , (3) sensor interface, analog input to module, 1.2 - v tolerant . input 33 sensor power output voltage from module, 3.3 v m ax . - 34 vdd_3.3v_rf 3.3 - v rf p ower s upply (connect to 3.3 - v rail) . - 35 sensor 4 (3) sensor interface, analog input to mod ule, 1.2 - v tolerant . input 36 sensor 5 (3) sensor interface, analog input to module, 1.2 - v tolerant . input 37 sensor 6 (3) sensor interface, analog input to module, 1.2 - v tolerant . input 38 sensor 7 (3) sensor interface, analog input to module, 1.2 - v tolerant . input 39 gnd ground . - 40 reset optional m odule r eset s ignal (active low) , 100 - k p ull up, apply pulse of at least 160 us, 3.3 - v t olerant . input 41 force_awake optional m odule a wake s ignal (active high), 100 - k pull down, apply pulse of at l east 260 us, 3.3 - v t olerant . input 42 gpio 14 gpio, 8 ma drive, 3.3 - v tolerant . i/o
www.rovingnetworks.com version 3.2 1 10/2/2012 7 rn - 171 pad number signal nam e description optional function direction note (1) 43 uart_rts uart rts flow control, 8 - ma drive, 3.3 - v tolerant . output 44 uart_cts uart cts flow control, 3.3 - v tolerant . input 45 uart_rx uart rx, 3.3 - v tolerant . input 46 uart_tx uart tx, 8 - ma drive, 3.3 - v tolerant . output 47 gnd ground . - 48 sreg_3v3_ctrl boost r egulator c ontrol . output 49 vdd - batt battery input, 2.0 - 3.3 v with boost regulator in use, connect to vdd if not using boost regulator . - notes : 1. signals marked as input are input s to the rn - 171 module. signals marked as output are output s from the module . 2. any of the sensors 0 - 3 can be used to wake the module. the sensor pins are 1.2 - v tolerant. do not apply 3.3 - v on these pins. do not apply 3.3 - v on any of sensor pins . 3. when sensor pins are used as sensor inputs, they saturate at 400 mv. sensor pins will accept input voltages up to 1.2 v but will saturate at 400 mv. do not apply 3.3 v on any of sensor pins. figure 5 show s the modules physical dimensions. figure 5 . module physical dimensions 1 mil = 0.0254 millimeters 700 mil 1,050 mil 35 mil 150 mil 135 mil 35 mil 50 mil 185 mil 185 mil pad dimensions: 40 x 90 mil (rounded ends)
www.rovingnetworks.com version 3.2 1 10/2/2012 8 rn - 171 design concerns the following sections provide information on designing with the rn - 1 7 1 module, including antenna design , solder reflow, boost regulator , etc. antenna design the rn - 171 supports several antenna designs, including a pcb trace antenna, chip antenna, wire antenna, and u.fl connector. pcb trace antenna figure 6 shows roving networks recommended pcb trace a ntenna patter n. the antenna ground should be connected to the ground plane and/ or ground polygon on both the top and bottom layers with at least 2 vias. the ground plane should come close to the antenna, exactly as shown in figure 6; t he distance is critical. th ere sho uld be no ground place/trace under the antenna under any circumstance s . the antenna feed go es through the polygon on a 50 - ohm impedance trace to the source of the signal. unless the antenna trace is exactly 50 ohm s and the source has a 50 - ohm output impeda nce , you should use a matching pi filter (2 capacitors and an inductor). the left side of the antenna should be placed on the pcb edge. if that is not possible , leave at least 1 inch of clearance from any trace or ground plane. the top and bottom of the an tenna (the shorter side) should be placed on the pcb edge or should have at least 1 - inch clearance from any trace or ground plane. to control the impedance of the antenna feed the board should be 4 layer s with a dedicated ground plane and a thickness of ar ound 8 - 14 mil s between the ground plane and the top layer (where the antenna feed is routed). a 2 - layer board would not be thin enough to obtain the desired impedance using a n acceptable trace width . figure 6 . pcb trace antenna p attern antenna f eed antenna ground
www.rovingnetworks.com version 3.2 1 10/2/2012 9 rn - 171 the trace from the rf pad t o the antenna feed should be 12 mil s thick on a 4 - layer pcb to achieve 50 ohms of impedance matching as shown in figure 7 . figure 7 . trace from rf pad to antenna feed chip antenna if yo ur design uses a chip antenna, roving networks recommends the 2450at42a100 manufactured by johanson . r efer to the antennas data sheet for additional information such as dimensions, mounting considerations , and radiation patterns. figure 8 shows the antenn a dimensions . 12-mil thick trace from rf pad to antenna feed
www.rovingnetworks.com version 3.2 1 10/2/2012 10 rn - 171 figure 8 . 450at42a100 chip antenna dimensions figure 9 shows the chip antennas m ounting considerations . figure 9 . chip antenna mounting considerations figure 10 shows the recommended chip antenna layout . figure 10 . recommended chip antenna layout l w a t 0.197 ?0.0008 0.079 ?0.0008 0.043 ?0.0008 0.020 ?0.0012 5.00 ?0.20 2.00 ?0.20 1.10 ?0.20 0.50 ?0.30 l w t a inches mm feeding point no connect function 1 2 no. 1 2 terminal con !guration 1.0 1.0 1.8 3.9 8.9 4.0 units: mm line width should be designed to provide 50-ohm impedence matching characteristics. mount these devices with the brown mark facing up.
www.rovingnetworks.com version 3.2 1 10/2/2012 11 rn - 171 the feed connecting the antenna to the rf pad must be 50 ohm in impedance. if t his feed is shorter than 0.2" the board can be 2 layer s and the thickness of the feed is t he same as described in the manufacturers data sheet. if the trace is longer , you need a 4 - layer board with controlled impedance , i.e., a ground pla ne directly under the top layer. the thickness should be calculated accordingly . wire antenna to implement a wire antenna, drill a hole through the board on the rf pad (pin 24) to place the wire antenna. to provide 50 ohms of impedance match ing , the rf path from the rf pad (pin 24) to the location of the wire antenna should be 12 mils thick on a 4 - layer pcb. s ee figure 11 . roving networks recommends that you use a n 18 - gauge wire with a length of 1 inch ?0.25. for best performance, the wire antenna should be perpendicular to the ground plane. note: there should be no thermal relief connectors on gnd for rf path and on the g round plane. figure 11 . wire antenna location u.fl connector figure 12 shows one option for implement ing a u.fl connector. the trace from the rf pad to the u.fl connector should be 12 mil s thick to achieve 50 ohm s of impedance matching on a 4 - layer board. the part number of the u.fl co nnector used for certification of the module is u.fl - r - sm from hirose. 28 29 30 31 32 21 22 23 24 25 26 27 20 19 18 17 16 a1
www.rovingnetworks.com version 3.2 1 10/2/2012 12 rn - 171 figure 12 . u.fl connector using batteries the rn - 171 module does not have a b oos t r egulator circuit. the battery choice is absolutely critical because if the battery voltage drops below 3 v, the module performance start s to degrade . one possible battery of choice is the 3.6 - v er14505 battery , which has a long battery life. if this bat tery is used to power the module, roving networks recommends that you use a 1 ,000 3 , 000 uf bypass capacitor because the er14505 battery has high output impedance. boost regulator the rn - 171 does not have a n on - board boost regulator. figure 13 shows a rec ommended ci rcuit for the boost regulator . designs that include the boost regulator will provide good power supply to the flash memory even when the battery voltage drops close to 1.8 v. if a board containing the rn - 171 does not include a boost regulator, it should include a 2.7 - v under - voltage reset circuit to prevent the module from accessing the flash memory when the supply voltage falls below 2.7 v. all supported flash chips are rated for a minimum vdd of 2.7 v. 28 29 30 31 32 21 22 23 24 25 26 27 20 19 18 17 16
www.rovingnetworks.com version 3.2 1 10/2/2012 13 rn - 171 figure 13 . boos t regulator circuit table 7 shows the recommended components for the b oost r egulator circuit . table 7 . boost regulator circuit compone nts designator description value manufacturer manufacturer part number vendor vendor part number d diode schottky 1a 20v sma ss12 micro commercial co ss12 - tp digikey ss12 - tpct - nd l inductor 1.0uh 30% smd 1uh taiyo yuden nr3015t1r0n digikey 587 - 1647 - 1 - nd q mosfet n - ch 20v 5.9 a dmn2050l diodes inc. dmn2050l - 7 digikey dmn2050ldict - nd roving networ ks recommends that you use a low voltage detector circuit , such as the xc61 from torex , tied to the rn - 171 modules reset pin to protect from low voltage. powering from a 3.3 - v regulated source apply 3.3 v regulated power to pins 10, 34 , and 49. leave pin 48 (sreg_3v3_ctrl) unconnected. note: do not connect pin 48 to ground. l eave it unconnected. solder reflow the r eflow temp erature must not exceed 220 c. to reflow solder the rn - 171 module onto a pcb , roving networks recommends a rohs compliant solder pas te equivalent to the nihon almit paste or omnix om - 310 solder paste from alpha metals . the module pads must have a solder past thickness of 5 mil. note: use no clean f lux . do not water wash! t h e temp erature profile is based on the ic level and other compon ents level only (without the shield can). from the perspective of the module only, a profile above 245 c should be acceptable. see figures 14 and 15.
www.rovingnetworks.com version 3.2 1 10/2/2012 14 rn - 171 figure 14 . solder reflow temperature profile figure 15 . solder reflow curve
www.rovingnetworks.com version 3.2 1 10/2/2012 15 rn - 171 compliance informati on table 8 describes the modules compliance information. table 8 . compliance information specification compliance fcc part 15.247 fcc t9j - rn171 ic rss - 210 low - power com munication d evice ce id # 0681 reg u9m21103 - 4249 - c radio en 300328 v1.7.1 (10/2006) emc en 301489 - 1 v1.8.1 (04/2008) en 301489 - 17 v2.1.1 (05/2009) safety en 60950 - 1:2006+a11:2010 en 50371 2002 - 03 rohs compliant ordering information table 9 provides ordering information. table 9 . ordering information part number description rn - 171 industrial temperature ( - 40 to + 85 c) with rf pad for external antenna . rn - 174 development boar d for rn - 171 module containing an rs - 232 and ttl uart hardware interface, status leds, power regulator, and sensor connections . rn - sma4 - rp 4 external antenna with r everse polarity sma connector. used with rn - ufl - sma6 . rn - ufl - sma6 6 cable with u.fl connector on one end and sma on the other . for other configurations, contact roving networks directly. go to http://www.rovingnetworks.com for current p ricing and a list of distributors carrying roving networks products.
www.rovingnetworks.com version 3.2 1 10/2/2012 16 rn - 171 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 register ed trademark of roving networks. apple inc., iphone, ipad, itunes, made for iphone are registered trademarks of apple computer. roving networks reserves the right to make corrections, modifications, and other changes to its products, documentation and ser vices 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 product risks, customers should provide adequate design and operating safeguards. roving networks products are not authorized for us e 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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