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www.rovingnetworks.com version 3.2r 4/9/2012 1 rn - 131 - ds rn - 131g & rn - 131c 802.11 b/g wireless lan module features qualified 2.4 - ghz ieee 802.11b/g transceiver ultra - low power: 4 ua sleep, 40 ma rx, 210 ma tx high throughput, 1 mbps sustained data rate with tcp/ip and wpa2 small, compact surface - mount module on - board ceramic chip antenna and u.fl connector for external antenna 8 - mbit flash m emory and 128 - kb ram uart hardware interface 10 general - purpose digital i/o pins 8 analog sensor interfaces real - time clock for wakeup and time stamping a ccepts 3.3 - v regulated or 2 to 3 v battery supports a d hoc and infrastructure networking modes o n bo ard ecos - os, tcp/ip stacks wi - fi alliance certified for wpa2 - psk fcc/ce/ ics certified and rohs compliant. industrial (rn - 131g) and commercial (rn - 131c ) grade temperature options applications remote equipment monitoring telemetry industrial sensors and h ome a utomation controls medical device monitoring description the rn - 131 module is a stand alone, embedded wireless 802.11 b/g networking module. with its small form factor and extremely lo w power consumption, the rn - 131 is p erfect for mobile wireless applications such as asset monitoring, gps tracking , and battery sensors. the wifly module incorporates a 2.4 - ghz radio, processor, tcp/ip stack, real - time clock, crypto accelerator, power management , and analog sensor interfaces as shown in figure 1 . th e module is preloaded with software to si mplify integration and minimize application development . in the simplest configuration , the hardware requires only four connections (pwr , tx , rx, and gnd) to create a wireless data connection. additionally, the sensor interface provides temperature , audio , motion, acceleration , and other analog data without requiring additional hardware. the module is pro grammed and controlled with a simple ascii command language. once the module is set up , it can scan to find an access point, associate, authenticate , and connect over any wi - fi network . figure 1 . rn - 131 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 u.fl connector for optional external antenna 2.4 ghz tx/rx epc/rfid 3.3-v boost regulator boost enable on-board chip antenna rn-131
www.rovingnetworks.com version 3.2r 4/9/2012 2 rn - 131 - ds overview host d ata r ate up to 1 mbps for the uart intelligent, built - in power management with programmable wakeup real - time clock for time stamping, auto - sleep , and auto - wake up c onfiguration over uart using simple ascii commands remote configuration over wifi using telnet supports o ver the air firmware upgrade (ftp) supports wps pushbutton mode for easy association with access points secure wifi authentication using wep - 128, wpa - psk (tkip), or wpa2 - psk (aes) built - in networking applications dhcp, udp, dns, arp, icmp , tcp, http client, and ftp client 802.11 power saving and roaming functions the modules size and weight are: size 1.49 x 0.78 x 0.15 (37mm x 20 mm x 3.5 mm) weight 0.140 oz tables 1 through 4 provide det ailed specifications for the module. table 1 . environmental conditions parameter rn - 131g rn - 131c temperature range (operating) - 30 o c to +85 o c 0 o c to +70 o c temperature range (storage) - 40 o c to +85 o c - 40 o c o +85 o c relative humidity (operating) 90% 90% relative humidity (storage) 90% 90% table 2 . electrical characteristics supply voltage min typ. max. unit supply v oltage vdd 3.0 3.3 3. 7 vdc supply v oltage (vbatt option) 2.0 3.0 3.3 vdc pin 21 switched 3.3 v output 150 m a digital i nput input logic high vih 2.3 v vdc input logic low vil 1.0 v vdc digital o utput drive gpio 4, 5, 6, 7, 8 24 m a gpio 9, 10, 11, 12, 13 8 m a power consumption sleep 4 ua standby ( doze) - 15 - ma connected (idle, rx) 40 ma connected ( tx) 140 212 ma
www.rovingnetworks.com version 3.2r 4/9/2012 3 rn - 131 - ds table 3 . analog sensor inputs parameter value sense 0,1,2,3 wakeup detect threshold 500 mv ad sense 0 - 7 measurement range 0 - 400 mv precision 14 bits = 12 uv accuracy 5% un - calibrated, 0 .01% calibrated minimum conversion time 35us (5khz over wi - fi ) sensor power (pin 33) output resistance 3.3 v 10 ohms, max current = 50 ma table 4 . radio characteristics parameter specifications frequency 2 , 402 to 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 - 85 dbm typ. output level ( c lass 1) +18 dbm maximum rf input to u.fl connector 10 dbm
www.rovingnetworks.com version 3.2r 4/9/2012 4 rn - 131 - ds typical application schematic figure 2 shows a typical application schematic. figure 2 . application schematic p3_3v led_green led_red
www.rovingnetworks.com version 3.2r 4/9/2012 5 rn - 131 - ds figure 3 shows the pin pads and table 5 describes the pins. figure 3 . pin pads table 5 . pin description pin name description default 1 sensor 6 sensor interface, analog input to module, 1.2 v. no connect 2 sensor 4 sensor interface, analog input to module, 1.2 v. no connect 3 sensor 5 sensor interface, analog input to module, 1.2 v. no connect 4 sensor 7 analog input to module, 1.2 v . no connect 5 reset module reset, a ctive l ow, reference to vdd - batt, 160 usec pulse . pull up 6 epc - ant - a epc port, rfid antenna a . no connect 7 epc - ant - b epc port, rfid antenna b . no connect 8 supercap balance center pin voltage on stacked super capacitors, a nalog 3.3 v . no connect 9 force_awake force the module to wakeup, input to module , 250 us min. pulse .3.3 v . 10 gpio - 13 uart rts flow control, 8 - ma drive, 3.3 - v tolerant . 11 gpio - 12 uart cts flow control, 8 - ma drive, 3.3 - v tolerant. 12 uart - rx input: rx in to the module , 3.3 - v tolerant . 13 uart - tx output: tx out from the module , 8 - ma drive, 3.3 - v tolerant . 14 not used not applicable no connect 15 not used not applicable no connect 16 not used not applicable no connect 17 3.3v - reg - out b oost regulator control output, connect to 3.3v - reg - in to enable . no connect 18 3.3v - reg - in b oost regulator control input , connect to 3.3v - reg - out to enable . gnd to disable 19 gnd ground . 20 vdd - batt battery input . 2.0 to 3.3 v with boost regulator in use, otherwise use 3.0 to 3.7 v . 21 vdd - in 3.3 to 3.7 voltage . d o not connect when boost regulator is in use . 44 43 42 41 39 38 37 36 40 14 15 16 17 19 20 21 22 18 35 34 33 32 31 30 29 28 27 26 25 24 23 1 2 3 4 5 6 7 8 9 10 11 12 13 top view (pads not visible from top)
www.rovingnetworks.com version 3.2r 4/9/2012 6 rn - 131 - ds pin name description default 22 dma - tx debug port (apply a 100 k pull down if ultra - low sleep power is required ) high z 23 dma - rx debug port no connect 24 gpio - 9 restore factory resets /e nter a d hoc mode , 8 - ma drive, 3.3 - v tolerant . input 25 gpio - 8 gpio, 24 - ma drive, 3.3 - v tolerant . gp output 26 gpio - 7 gpio, 24 - ma drive, 3.3 - v tolerant . gp output 27 gpio - 6 association status, 24 - ma drive, 3.3 - v tolerant . led_red output 28 gpio - 5 data transfer status, 24 - ma drive, 3.3 - v tolerant . led_yellow output 29 gpio - 4 connection status, 24 - ma drive, 3.3 - v tolerant . led_green output 30 sensor - 1 sensor interface, analog input to module, 1.2 v . 31 sensor - 2 sensor interface, analog input to module, 1.2 v . 32 sensor - 3 sensor interface, analog input to module, 1.2 v . 33 sense - pwr voltage output from module to power external sensors, 3.3 v . 34 sensor - 0 wakeup from external condition . 35 no connect no connect 36 - 44 gnd must be connected for proper antenna performance . figure 4 shows the modules physical dimensions. figure 5 shows the pad dimensions.
www.rovingnetworks.com version 3.2r 4/9/2012 7 rn - 131 - ds figure 4 . module physical dimensions figure 5 . pad dimensions rn-131 ceramic chip antenna u.fl connector rf shield 20 mm 2.5 mm 2.5 mm 37 mm ceramic chip antenna rf shield 3.5 mm
www.rovingnetworks.com version 3.2r 4/9/2012 8 rn - 131 - ds design concerns the following sections provide information on designing with the rn - 131 module, including radio interference, grounding, solder reflow, connection status, etc. m inimizing r adio i nterference when integrating the wifly module with the on - board chip antenna , en sure that the area around the chip antenna end of the module protrudes at least 6 mm from the mother board and any metal enclosure. if this placement is not possible , use the on - board u.fl connector to route to an external a ntenna. the 8.5 - mm area under the modules antenna end should be kept clear of metallic components, connectors, vias, traces , and other materials that can interfere with th e radio signal. see figure 6 . figure 6 . antenna clearance rn-131 keep metallic components, connectors, vias, & traces away from antenna area 20 mm 8.5 mm top view 6 mm
www.rovingnetworks.com version 3.2r 4/9/2012 9 rn - 131 - ds g rounding recommendations for the module antenna to function , pins 36 through 4 4 must be connected to ground . roving networks suggest s you place the module such that 0.5 mm of theses pads is exposed. this placement provides access for sold ering pins 36 through 44 from below , and provides ample clearance of the antenna from the pcb . see figure 7 . figure 7 . module placement for grounding solder reflow the solder r eflow temperature must not exceed 220 c. to reflow solder the module onto a pcb , roving networks recommends a n rohs - compliant solder paste equivalent to nihon almit paste or omnix om - 310 solder paste from alpha metals . see table 6 . note: use n o - clean f l ux and d o not water wash. table 6 . paste solder recommendations manufacturer alpha metals http://www.alphametals.com nihon almit co. ltd http://almit.co.jp part number omnix om - 310 lfm - 70w inp metal composition sac305 (96.5% sn, 3% ag, 0.5% cu) 88% sn, 3.5% ag, 0.5% bi, 8% in liquidus temperature ~220c ~215c figures 8 and 9 show the solder reflow temperature profiles. rn-131 for proper antenna performance, pins 36 through 44 must be grounded 8.5 mm bottom view motherboard for rn-131
www.rovingnetworks.com version 3.2r 4/9/2012 10 rn - 131 - ds figure 8 . solder reflow temperature profile
www.rovingnetworks.com version 3.2r 4/9/2012 11 rn - 131 - ds figure 9 . solder reflow curve u.fl connector roving networks recommends that you u se the hirose u.fl connector (part number u.fl - r - smt ) for connecting external antenna s. if you prefer to use the sma connector, use the roving networks u.fl - to - sma cable (part number rn - ufl sma6 ). figure 10 shows the u.fl connector dimensions. figure 10 . u.fl connector dimensions
www.rovingnetworks.com version 3.2r 4/9/2012 12 rn - 131 - ds connection status gpio4, gpio5, and gpio 6 drive status t he leds. gpio 4 indicates the tcp/ip connection status. this signal is on high for an active connection, toggles fast to indicate no ip address , and toggl es slow ly to indicate that the ip address is ok but not connected. gpio 6 indicates the association st atus. high means the module is not associated with a network, o ff indicates that it is associated and internet access is ok. gpio 5 toggles when data is transferred. keep - out areas when designing your pcb avoid exposed trace s and via s beneath the module. figure 11 shows areas on the module that should be kept clear. figure 11 . keep out areas powering the module the modul e can be powered from either 3.0 - v dc batteries or 3.3 - v dc regulated power. for 3.0 - v dc battery power : apply power to pin 20 (vdd - batt) . short pin 17 (3.3 v reg - out) to pin 18 (3.3 v reg - in) (battery boost mode) . 150 ma of current at 3.3 v is available for external devices on pin 21 when the module is in battery boost mode. for 3.3 - v dc power : apply power to pin 20 (vdd - batt) and pin 21 (vdd - in) . connect pin 18 (3.3 v reg - in) to ground and leave pin 17 (3.3 v reg - out) unconnected. 3 mm 8.0 mm 6 mm 5 mm keep out areas. there are two 1-mm round test pads on the bottom of the module. avoid placing exposed traces or vias in these areas.
www.rovingnetworks.com version 3.2r 4/9/2012 13 rn - 131 - ds reset ( pin 5 ) the reset signal is used to reset the module and is active low. this pin has a built - in 100 - k pull up resistor . you do not need to connect this; it can be left unconnected. to reset the module , apply a 3.3 - v pulse for a minimum of 160 us. force awake ( pin 9) this signal forces the module to wake up from sleep. force_awake is an active - high signal. to wake the module, apply a 3.3 - v pulse for a minimum of 250 us. achieving l owest p ower in s leep m ode to achieve the lowest power consumption (4 ua) in sleep mode , connect a weak pull - down (100 k resistor to gnd) on pin 22 ( dma - tx ) . if gpio8 through gpio 4 are being used to drive an output, connect a 100 - k pull - down resistor. any unused (no connect) gpio pin s can be left floating. pin 25: gpio 8 pin 26: gpio 7 p in 27: gpio 6 pin 28: gpio 5 pin 29: gpio 4 for other gpio lines, you do not need to use a pull down . the module already has an on - chip internal pull down ( 80 k ) ; the power consumption in sleep mode without these signals connected to a pull down is 655 ua . sensor interfaces inputs must not exceed 1.2 v. the s ensitivity saturates at 400 mv. ad h oc m ode & restoring factory settings ad hoc mode is controlled with gpio 9 (pin 24). rov i ng networks recommends that you connect pin 24 to a switch or jumper connecte d to a pull up. when gpio 9 is driven high at power up , the module enters a d hoc mode. if gpio 9 is then toggled low 5 times, the module will be restored to its initial factory default configuration . this feature is useful fo r cases where the module is mis c onfigured and is no long responding.
www.rovingnetworks.com version 3.2r 4/9/2012 14 rn - 131 - ds compliance informati on the following sections describe the modules fcc and ncc compliance information. fcc compliance this equipment has been tested and found to comply with the limits for a class digital device, purs uan t to part 15 of the fcc rules. these limits are designed to provide reasonable protection against harmful interference in a residential installation. this equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to the radio communications. however, there are no guarantees that interference will not occur in a particular installation. troubleshooting if this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following instructions reorient or relocate the receiving antenna . increase the s eparation between the equipment and receiver . connect the equipment to an outlet or a circuit difference from that to which the receiver is connected . consult the dealer or an experienced radio/tv technician . conditions operation is subject to the following conditions this device may not cause harmful interference . this device must accept any interference received, including interference that may cause undesired operation. markings to satisfy the fcc exterior labeling requirements the following text must be placed on the exterior of the end product . contains module fcc id: u30 - g2m5477 this marking applies to the g2m5477 and the rn - 131 module, which are the same. any similar working that expresses the same meaning may be used. fcc warning modificatio ns modifications not expressly approved by the manufacturer could void the users authority to operate the equipment under fcc rules. see table 7 .
www.rovingnetworks.com version 3.2r 4/9/2012 15 rn - 131 - ds table 7 . radio frequency exposure property (units measured) value units antenna gain 2.0 dbi numeric gain 1.58 numeric max allowable peak power +23.76 dbm max a llowable peak power 237.7 mw cal culated safe distance at 1 5.5 mw/cm 2 minimum separation distance 20 cm 3 this equipment has been evaluated in accordance with the fcc bulletin 56 hazards of radio frequency and electromagnetic fields and bulletin 65 human exposure to radio frequency and electromagnetic fields . a distance greater or equal to 20 cm from the device should be maintained for safe operation in an uncontrolled environment. ncc (taiwan s tatement) contains transmitter module ncc id: ccaf11lp0240t6 802.11b/802.11g/bt /? h g?m ?y=?-p ??;| ???d|??| ?r??; ??? ?pzc g-p??j
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? ?? { unofficial translation article 12 without permission granted by the ncc, any company, enterprise, or user is not allowed to change frequency, enhance transmitting power or alter original characteristic as well as performance to an approved low power radio - frequency devices. article 14 the low power radio - frequency devices shall not influence aircraft security and interfere legal communications . if found, the user shall cease operating immediately until no interference is achieved. the said legal communications means radio communications is operated in compliance wi th the telecom munications act. the low power radio - frequency devices must be susceptible with the interference from legal communications or ism radio wave radiated devices.
www.rovingnetworks.com version 3.2r 4/9/2012 16 rn - 131 - ds table 8 . compliance information specification compliance fcc id u3o - g2m5477 part 15.247 ic ( c anada) rss - 210 ce eu id # 0681 reg u9m20901 - 1000 - c radio en 300328 v1.7.1 (10/2006) emc en 301489 - 1 v1.8.1 (04/2008), en 301489 - 17 v1.3.2 (04/2008) safety en 60950 - 1:2001+a11:2004 rohs compliant ordering information table 9 provides ordering information. table 9 . ordering information part number description rn - 131g industrial temperature ( - 30 to + 85 c ) with chip antenna and u.fl connector rn - 131 c commercial temperature (0 to + 70 c ) with chip antenna and u.fl connector rn - 131g - eval development kit for the rn - 131g (includes the rn - 131g module) rn - 13 4 rn - 131 evaluation board , includes rs - 232, leds, and power regulator. sensor connections . rn - sma4 - rp 4 external antenna with reverse polarity sma connector. used with rn - ufl - sma6 rn - ufl - sma6 6 inch cable with u.fl connector on one end and sma on the other for other configurations, contact roving ne tworks directly. go to http://www.rovingnetworks.com for current pricing and a list of distributors carrying roving networks products.
www.rovingnetworks.com version 3.2r 4/9/2012 17 rn - 131 - ds notes
www.rovingnetworks.com version 3.2r 4/9/2012 18 rn - 131 - 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 computer. 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 info rmation 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 produc t 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 expec ted to cause severe personal injury or death, unless officers of the parties have executed an agreement specifically governing such use.

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