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| xecom (1) XE24S500 XE24S500 december 2006 xecom XE24S500 the smallest, complete 2.4 ghz fhss transceiver description the xecom XE24S500 is a miniature 2.4 ghz spread spectrum transceiver. it includes all rf hardware and a micro-controller to manage the communications link. the micro-controller manages all communications task including configuration, data packaging, and frequency hopping. the result is a complete wireless data communications solution. the XE24S500 package is unique because of its size (less than 1.4 square inches), its leadless surface-mount design, and the availability of an on-board chip antenna. no competitive products can offer a solution as flexible, convenient, and easy to integrate, there are two XE24S500 models; the XE24S500c with the on-board chip antenna and the XE24S500d with dipole antenna connector. the dipole antenna improves range while the chip antenna lowers system cost and simplifies integration. development kits are available for each version. a pin-compatible, lower power variant is also available, the xe24s100, for applications with lesser range requirements. models ? XE24S500c: includes on-board chip antenna XE24S500d: includes dipole antenna connector XE24S500dk-c: XE24S500c development kit XE24S500dk-d: XE24S500d development kit features 1.55? x 0.9? x 0.12? leadless surface-mount package utilizes globally available 2.4 ghz ism band control and configuration with at commands. 254 unique node addresses plus 254 unique group ids allow multiple large networks to coexist. programmable transmit power output, max. 500 mw typical receiver sensitivity -87 dbm typical throughput rate 20,000 bps obstructed signal range 700 feet (XE24S500d) multiple low power operating modes sensoronair tm (patent pending) allows direct connection of sensors to the smart transceiver count-off tm (patent pending) allows the host node to download the status of all nodes in under 10 seconds. fcc part 15 modular certification XE24S500 block diagram antenna rf amp 2.4 ghz transceiver saw filter saw filter controller r mux rf amp
xecom (2) XE24S500 x e24s500 mechanical specifications bottom 0.100? 0.100? 1 9 10 18 xecom (3) XE24S500 using the XE24S500 power saving modes the XE24S500 includes three low power operating modes (sleep, power-down and rf monitor) to allow the host application to make maximum use of the available power. the #p command selects the transceiver operating mode when it is not actively transmitting or receiving data. below are descriptions of all of the available selections. idle: in idle mode all XE24S500 circuits are powered and available for immediate action. this includes the rf receiver which actively monitors the air for an incoming communications request. sleep : in sleep mode all XE24S500 circuits are powered-down to minimize power consumption. the XE24S500 cannot accept commands or respond to incoming rf communications requests from sleep mode. any input on txd will wake the transceiver and return it to the previous mode, either the idle or power-down mode current draw in sleep mode is less than 50 microamps. power-down: in power-down mode all rf circuitry is shut down but the communications controller remains active to accept at commands. the XE24S500 cannot respond to incoming rf communications requests. if a transmit rf or receive rf command is received, the XE24S500 can activate the rf section in under 200 microseconds. current draw in power-down mode is less than 2 milliamps. rf monitor mode : rf monitor mode holds the transceiver in power down mode for an interval set by register s110. the transcevier then activates, turns on its receiver, and checks the air for incoming messages. if no messages are detected within 200 milliseconds, the transceiver returns to power down mode. if carrier is detected, the transceiver completes the transaction before returning to power down mode. s110 selects an interval of 1 to 60 seconds. power consumption in rf monitor mode ranges from 1 to 10 milliamps depending upon the setting. rf receive mode : in rf receive mode the XE24S500 is actively receiving an incoming data signal. current draw in rf receive mode is typically 30 milliamps . rf transmit mode : in rf transmit mode the XE24S500 is actively transmitting a data signal. current draw in transmit mode is no more than 700 milliamps with the transmit output power set to maximum, 500 milliwatts. at command control the XE24S500 power saving modes are controlled by the at#pn command as described below. at#p0 select idle mode. at#p1 select sleep mode. at#p2 select power-down mode. at#p3 select rf monitor mode rf monitor interval: s110=n values of 1 to 60 set the rf monitor interval in 1 second increments xecom (4) XE24S500 x e24s500 pin configuration signal pins description dio2 1 dio2 may be programmed as either a digital input or digital output. it connects directly to the communications controller in the XE24S500. dio3 2 dio3 may be programmed as either a digital input or digital output. it connects directly to the communications controller in the XE24S500. vcc 3 3.3 volt power for the XE24S500. /rts 4 request to send provides hardware flow control from the host system. the host system drives /rts high to signal the XE24S500 to temporarily stop the flow of data on rxd. /cts 5 clear to send provides hardware flow control from the XE24S500. the XE24S500 drives /cts high to signal the host to temporarily stop the flow of data on the txd. rxd 6 received data is the data output from the xe24s. txd 7 transmit data is the data input to the xe24s n/c 8-12 no connection reserved 13 this pin is reserved for future use adc0 14 analog input 0 to the XE24S500 communications controller. adc0 connects to an internal 12-bit analog to digital convertor. adc0 may also be configured as a digital input if no analog inputs are required. adc1 15 analog input 1 to the XE24S500 communications controller. adc1 connects to an internal 12-bit analog to digital convertor. adc1 may also be configured as a digital input if no analog inputs are required. ground 16 common voltage reference for the XE24S500. dio1 17 dio1 may be programmed as either a digital input or digital output. it connects directly to the communications controller in the XE24S500. dio0 18 dio0 may be programmed as either a digital input or digital output. it connects directly to the communications controller in the XE24S500. dio2 1 18 dio0 dio3 2 17 dio1 vcc 3 16 gnd /rts 4 15 adc1 /cts 5 14 adc0 rxd 6 13 reserved txd 7 12 n/c n/c 8 11 n/c n/c 9 10 n/c XE24S500 top view xecom (5) XE24S500 a bsolute maximum ratings vcc 3.6 volts storage temperature -55 o c to +125 o c operating temperature range -40 o c to +85 o c warning: exceeding any of these ratings will void the warranty and may damage the device XE24S500 electrical specifications vcc 3.0 3.3 3.6 volts icc 700 800 ma transmit (500 mw output) 30 ma receive mode 20 ma idle mode 1 10 ma rf monitor 1.0 ma power-down mode 0.050 ma sleep mode output power: 100 500 mw 50 ohm load wireless receive sensitivity -87 dbm range thru physical obstructions 700 feet 500 mw output frequency hopping channels tbd frequency band 2.400 2.4835 ghz antenna output impedance 50 ohms latency tbd msec voh 2.4 volts vol 0.8 volts vih 2.0 volts vil 0.4 volts parameter min typ max units comments xecom (6) XE24S500 XE24S500 typical connection diagram antenna 3.3 v c1 c2 c3 c4 c5 l1 parts list for XE24S500 typical connection diagram reference designation qty description c1 1 capacitor, electrolytic, 100 ufd, 10 volts c2, c4 2 capacitor 0.1 ufd, 10 volts c3, c5 2 capacitor 47 pfd, 10 volts l1 1 tbd antenna * 1 50 ohm, 1/4 wave; dio2 dio0 dio3 dio1 vcc gnd /rts adc1 /cts adc0 rxd reserved txd n/c n/c n/c n/c n/c XE24S500 top view host serial i/f xecom (7) XE24S500 XE24S500 communications controller an internal micro-controller serves as the XE24S500 communications controller. this micro-controller manages the host interface, manages the wireless link, and formats data for the rf communications. host interface the XE24S500 has two primary system interfaces; the serial interface and the direct sensor interface supported by sensoronair?. the communications controller manages both interfaces. serial interface the XE24S500 supports a 4-line serial interface. control and configuration of the transceiver takes place through the serial interface using modem-like at commands. the serial data rate is configurable from 1200 to 115.2k bits per second. the supported serial interface signals are listed below. txd - transmit data; input for commands and for data to be transmitted on the wireless link. rxd - received data; the output for received rf data and responses to at commands. /rts - request to send, hardware flow control input. the host raises /rts to tell the XE24S500 to stop passing data on rxd. /cts - clear to send, is the hardware flow control output. the XE24S500 raises /cts to stop data input on the txd lead. XE24S500 at command format each command follows a standard command format as described below. commands are accepted at data rates from 1200 to 115,200 bps. the default serial data rate is 9600 bps and is changed using register s23. command prefix - each command, except a/, begins with the at prefix. the "a" and "t" may be either both upper case or both lower case but cannot be of different cases. the prefix identifies parity of the commands sent to the XE24S500 by comparing the parity bits of the "a" and the "t" characters. command line - commands may be strung together in a single command line of up to 30 characters. commands in the command string are executed in the sequence they appear. an ?error? response will be issued if the command buffer is overfilled and none of the commands will be executed. omitted parameters - many commands include a parameter which determines the function setting. when the command parameter is omitted from the command string, it is assumed to be a 0. result codes - result codes are normally issued after each action. result codes may be provided as full words, numeric codes, or may be disabled. when numeric result codes are chosen, each result code ends with a carriage return. full word result codes are preceded and followed by a line feed and carriage return. disconnect sequence - a 3-character sequence initiates a disconnect of the wireless link. the sequence ?~~~? is assigned to disconnect the link. direct connection of sensors sensoronair ? permits sensors to be connected directly to the XE24S500 without an application controller. the XE24S500 communications controller controls the operation of the sensors. sensor i/o lines ? sensoronair ? controls the operation of 6 i/o lines. this includes 2 analog inputs, adc0 and adc1, and 4 digital i/o lines, dio0, dio1, dio2, and dio3. adc0 and adc1 are connected to a 12-bit analog to digital converter and use a 2.5 volt reference derived from vcc as their reference voltage. the digital i/o lines can be programmed to act as either inputs or outputs. xecom (8) XE24S500 configuring for sensor operation all sensoronair ? functions are performed by the XE24S500 communications controller. modem-like at commands loaded through the serial interface, program the functions of the analog and digital lines. the configuration is then stored in flash memory. this allows the XE24S500 to be programmed and then installed in the application. sensoronair commands ? below is a list of the commands and registers used to program sensoronair ? operation. s107 - defines the i/o lines. the two analog inputs, adc0 and adc1, can also be defined as digital i/o lines if needed. the four digital lines, dio0, dio1, dio2, and dio3; can be set as either inputs or outputs. the value of this register is stored in flash memory. at&ian? - this command allows a local host to read the value of analog input ?n.? at&idn? - this command allows a local host to read the status of digital i/o ?n.? at&idn=z - this command allows a local host to set the condition of the digital output ?n.? when z=0 the output is set to a logic low; when z=1 the output is set to a logic high. at#ixxxan? - this command allows the value of analog input ?n? on node address ?xxx? to be read remotely. XE24S500 communications controller (continued) at#ixxxdn? - this command allows the status of digital i/o ?n? on node address ?xxx? to be read remotely at#ixxxdn=z - this command allows the state of digital output ?n? on node address ?xxx? to be set remotely. when z=0 the output is set to a logic low; when z=1 the output is set to a logic high. wireless communications the communications controller manages the rf link including the frequency hopping algorithm; collision avoidance, node addressing, and data packets. the communications controller supports point-to-point, point-to-multipoint or multipoint networks. carrier sense multiple access (csma) to prevent collisions between nodes, the XE24S500 uses a carrier sense multiple access protocol at each transceiver. all nodes listen for link activity before initiating a session. if a wireless link already exists, the transceiver waits until that session is complete before initiating a new wireless link. data packets data presented by the system host is placed into packets by the XE24S500 communications controller for transmission across the wireless link. these packets provide addressing and error correction for the wireless communications. the received data is extracted from the packets before being passed to the serial interface. xecom (9) XE24S500 transmitter receiver txd rxd txd rxd description at#t01 xecom (10) XE24S500 x e24s500 communications controller (continued) user code the texas instruments msp430f148 microcontroller serves as the communications controller in the XE24S500 transceiver modules; however, the communications functions do not fully utilize the capabilities of the microcontroller. xecom has created a way for our customers to run their simple remote monitoring application on the transceiver?s communications controller saving the complexity and cost of incorporating a separate microcontroller. has shown in the software block diagram above, the user code interfaces to the rest of the xe24s code through the user code support block. the user code support block interfaces to the at command engine and serial interface and supports other features such as sub routine calls. to prevent the user code from interfering with the communications responsibilities of the controller, the user code must be written in user tasks. each user task is a simple state machine that can quickly complete its function. a full description of the requirements of the user tasks can be found in the ?xe24s user application programmers guide. xecom (11) XE24S500 at commands an asterisk indicates the factory default a answer command - force response to a link request dn initiate a wireless link - attempt to connect with the transceiver at address n. en echo characters - n=0 characters not echoed n=1 characters echoed * in product identification - n=0 display product code n=1 display product name n=2 display model number n=3 display copyright n=4 display firmware revision qn result code display - n=0 display result codes * n=1 do not display result codes sn= set value of register sn sn? read value of register sn vn response type - n=0 numeric responses n=1 full word responses * zn reset - executes a soft reset n=0 reset to values in user profile 0 * n=1 reset to values in user profile 1 &f restore factory settings - return commands and registers to default values. &ian? read local analog input ?n? - allows the host to read local analog inputs. n=0 read input adc0 n=1 read input adc1 &idn? read local digital input ?n? - read the status of the local digital inputs. n=0 read input dio0 n=1 read input dio1 n=2 read input dio2 n=3 read input dio3 n=4 read dio4 (adc0 set as digital i/o) n=5 read dio5 (adc1 set as digital i/o) &idn=z set local digital output ?n? - sets the state of the local digital outputs. z=0 sets the output to a logic low; z=1 to a logic high. n=0 set output dio0 n=1 set output dio1 n=2 set output dio2 n=3 set output dio3 &kn flow control - selects the flow control used between the system host and the XE24S500 n=0 flow control disabled n=3 rts/cts, hardware flow control n=4 xon/xoff, in-band flow control &v view active configuration - sends the active configuration data to the system host. &wn store current configuration - loads the current configuration into user profile 0 or 1. n=0 load configuration into user profile 0 n=1 load configuration into user profile 1 # b wireless broadcast - initiates wireless broadcast for diagnostic purposes. #c count-off request (ascii) - initiates a ?count-off? sequence. status report in ascii. #e: count-off response (ascii) - programs the 8 byte ascii ?count-off? status message. #e= count-off response (hex) - programs the 8 byte ?count-off? response in hex format. xecom (12) XE24S500 #ixxxan? read analog input ?n? at node address xxx - allows analog input values at any node to be read remotely. n=0 read input adc0 n=1 read input adc1 #ixxxdn? read digital input ?n? at node address xxx - this command allows digital input status to be read remotely. n=0 read input dio0 n=1 read input dio1 n=2 read input dio2 n=3 read input dio3 n=4 read dio4 (adc0 set as digital i/o) n=5 read dio5 (adc1 set as digital i/o) at commands #ixxxdn=z set digital output ?n? at node address xxx - remotely modify digital output n. a 0 sets the output to a logic low; a 1 sets it to a logic high. n=0 set output dio0 n=1 set output dio1 n=2 set output dio2 n=3 set output dio3 #pn low power operation - sets the XE24S500 reduced power modes. 0 idle mode. 1 sleep mode. 2 power-down mode. 3 rf monitor mode #r receive broadcast - allows XE24S500 to receive a broadcasted message and present it on the serial interface. x e24s500 responses numeric full w ord description 0 ok successfully executed command line 1 connect rf wireless connection established 2 ring wireless link request detected 3 disconnect lost wireless link 4 error error in command line, or file transfer 6 no connection failed to establish wireless link 7 busy link request time out has occurred 8 sorry no response to count-off request 9 wait w ireless link is not available file file transfer mode xecom (13) XE24S500 x e24s configuration registers s14 bit-mapped register - s14 stores the values of the ate, atq and atv commands. s23 serial interface data rate - range 1-10 1 = set serial data rate to 1200 bps 2 = set serial data rate to 2400 bps 3 = set serial data rate to 4800 bps 4 = set serial data rate to 9600 bps* 5 = set serial data rate to 14400 bps 6 = set serial data rate to 19200 bps 7 = set serial data rate to 28800 bps 8 = set serial data rate to 38400 bps 9 = set serial data rate to 57600 bps 10 = set serial data rate to 115200 bps default:4 s39 bit-mapped register - s39 stores the value of the at&k command. s104 group id number - s104 sets the group id number. multiple groups may be active in the same area. only units with the same group id number can communicate. range: 0-255 default:0 s105 node address - s105 sets the transceiver?s node address. each unit in a network is required to have a unique node address. range: 1-254 s0 answer wireless link request: s0 determines if the XE24S500 automatically responds to a wireless link request. s0=0 no response to link requests s0=1 automatically respond to link request s0=128 enter broadcast mode on power- up. the register value must be stored in nonvolatile memory with the at&w command. s2 wireless disconnect character - s2 sets the ascii character used in the disconnect sequence. the default character is tilde ?~?. range: 0-255 default:126 s7 link set-up timer - s7 sets the length of time in seconds that the transceiver attempts to create a link with the destination node. range: 0-60 default: 10 s10 link recovery timer - s10 determines the how long in seconds that the transceiver tries to recover a broken link. range: 0-60 default: 10 s12 disconnect guard timer - s12 sets the guard timer before and after the disconnect sequence in milliseconds. if any characters are received within the window defined by s12, the disconnect request will be ignored.. range: 0-255 default:20 units: milliseconds xecom (14) XE24S500 x e24s configuration registers s107 i/o configuration - s107 is a bit-mapped register which defines the local i/o lines. bit 0 =0 adc0 and adc1 defined as digital i/o =1 adc0 and adc1 defined as analog inputs bit 1 = reserved bit 2 = 0 dio0 defined as an output = 1 dio0 defined as an input bit 3 = 0 dio1 defined as an output = 1 dio1 defined as an input bit 4 = 0 dio2 defined as an output = 1 dio2 defined as an input bit 5 = 0 dio3 defined as an output = 1 dio3 defined as an input bit 6 = 0 dio4 defined as an output (bit 0 must be equal to 0) = 1 dio4 defined as an input bit 7 = 0 - dio5 defined as an output (bit 0 must be equal to 0)) = 1 - dio5 defined as an input default:193 s108 transmit level control - s108 sets the XE24S500 transmitter output level range: tbd s110 rf monitor interval - s110 sets the intervals that the XE24S500 wakes to check for a valid rf carrier signal. values from 1 to 60 set the interval in seconds. teh dfault value is 2 seconds. range: 1-60 default: 2 xecom (15) XE24S500 fcc part 15 regulations mounting the XE24S500 in your assembly the XE24S500 must be mounted horizontally on your printed circuit board to maintain proper orientation of the transceiver. standoffs should also be used on the side opposite the pin row to maintain clearance between the XE24S500 and you printed circuit board. the XE24S500 may not be co-located with any other antenna or transmitter. XE24S500 antenna the XE24S500 is certified for compliance to fcc part 15 rules only using the xecom tbd, 1/4 wave monopole antenna. use of any other antenna violates fcc part 15 rules. fcc part 15 certification the XE24S500 has been certified per fcc part 15 rules for integration into oem products without further testing or certification. this certification is your assurance that the XE24S500 will not cause harmful interference. labeling requirements fcc rules require the original equipment manufacturer using the XE24S500 to place an appropriate label on the outside of the finished equipment. the label must be clearly visible and include the information shown below. contains transmitter module fcc id: tbd warning: this device complies with part 15 of the fcc rules. its operation is subject to the following conditions: (1) this device may not cause harmful interference. (2) this device must accept any received interference including interference that may cause undesired operation. limitations the XE24S500 is registered under fcc part 15 rules. to utilize this registration on your oem system you must follow the applications circuit provided in this data sheet and use the listed antennas. any changes or modifications to the recommended circuit must be approved by xecom. failure to seek xecom?s approval for modifications could void certification of the end product. warning: rf exposure the XE24S500 is approved for mobile, base station and mobile applications. a minimum separation of 20 centimeters should be maintained between the antenna and the equipment operator. for mobile applications check the minimum separation distances defined below. to ensure compliance, operation at distances closer than those defined is not recommended. the warning message below must be included in the user manual for the end product. to comply with fcc rf exposure requirements for mobile transmitting devices, this transmitter should only be used or installed at locations where there is at least 20 cm separation distance between the antenna and all persons. fcc notifications the XE24S500 generates radio frequency energy. it must be installed according to the manufacturer?s guide- lines stated in the data sheet or it has the potential to cause interference with other radio devices. testing has been performed to assure that it conforms with the fcc part 15 rules for intentional and unintentional radiators. no further emi compliance testing of the transmitter is required as long as the 20 cm separation and co-location requirements are observed. each new use of the module will, however, need to be scanned for unintentional ra- diation from digital clocks, etc. all necessary calibration has been performed at the time of manufacture. any modification of the device after it leaves the factory is a violation of fcc rules. xecom (16) XE24S500 devices sold by xecom are covered by the warranty provisions appearing in its terms of sale only. xecom makes no war- ranty, express, statutory, implied, or by description regarding the information set forth herein, or regarding the freedom of t he de- scribed devices from patent infringement. xecom makes no warranty of merchantability or fitness for any purposes. xecom reserves the right to discontinue production and change specifications and prices at any time and without notice. this product is intended for use in normal commercial applications. applications requiring extended temperature range, unusual envi - ronmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment, are specifically not recommended without additional processing and authorization by xecom for such application. xecom assumes no responsibility for the use of any circuitry other than circuitry embodied in a xecom product. no other cir- cuits, patents, or licenses are implied. xecom's products are not authorized for use as critical components in life support devices or systems. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) sup- port or sustain life, and whose failure to perform, when properly used in accordance with instructions provided in the labeling , can be reasonably expected to result in significant injury to the user. a critical component is any component of a life support device or system whose failure to perform can be reasonably ex- pected to cause failure of the life support device or system, or to affect its safety or effectiveness. terms of sale l ife support policy copyright, xecom ? 2005 while xecom, inc. has made every effort to ensure that the information presented here is accurate, xecom will not be liable for any damages arising from errors or omission of fact. xecom reserves the right to modify specifications and/or prices without notice. product mentioned herein are used for identification purposes only and may be trademarks and/or registered trademarks of their respective companies. xecom incorporated 374 turquoise street, milpitas, ca 95035 ph:408-942-2200 fax:408-942-1346 e-mail: info@xecom.com |
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