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rev. 0.1 6/12 copyright ? 2012 by silicon laboratories si4455-2waylink-demo si4455-2waylink-demo si4455 ezr adio ? t wo -w ay l ink d emo k it u ser ? s g uide 1. overview thank you for your in terest in silicon l aboratories si4455 ezr adio? two-way link demo kit. the silicon laboratories si4455 ezradio two way link demo kit (p /n ezr-ledk2w-xxx) contains everything you need to familiarize yourself with and evaluate the si4455 transceiver. the kit ha s three versions: one for the 434 mhz band, one for the 868 mhz band and one for the 915 mhz band. the key features of the demo kit are as follows: ?? the demo boards have four leds to display informat ion and four push-buttons to receive user commands. ?? the provided software pack contains all the documentation and files needed to develop a user application. ?? the kit supports the use of the silicon laboratories in tegrated development environment (ide) for software debugging and the use of the keil & sdcc c compiler, assembler, and linker toolchain. ?? the kit supports the use of the wireless development suit (wds) for setting radio parameters & managing application firmware. ?? the demo boards come with the si4455 range test demo application. the range test demo implements packet error rate (per) measurement. per is a comm only-used technique for measuring the quality of rf links in wireless systems un der particular conditions. 1.1. kit contents table 1. kit contents qty part number description ezr-ledk2w-434 si4455 ezradio two way demo kit 434mhz 2 4455-led-434-per si4555 rfstick 434mhz ezradio transceiver board 2 toolstick_ba toolstick base adapter 2 usb-xten-01 usb extender cable (usba-usba) 4 aaa aaa alkaline battery ezr-ledk2w-868 si4455 ezradio two way demo kit 868mhz 2 4455-LED-868-PER si4555 rfstick 868mhz ezradio transceiver board 2 toolstick_ba toolstick base adapter 2 usb-xten-01 usb extender cable (usba-usba) 4 aaa aaa alkaline battery ezr-ledk2w-915 si4455 ezradio two way demo kit 915mhz 2 4455-led-915-per si4555 rfstick 915mhz ezradio transceiver board 2 toolstick_ba toolstick base adapter 2 usb-xten-01 usb extender cable (usba-usba) 4 aaa aaa alkaline battery
si4455-2waylink-demo 2 rev. 0.1 figure 1. si4455 rfstick 434 mhz transceiver board (p/n 4455-led-434-per) figure 2. toolstick base adapter (p/n toolstick_ba) for more information on using the rfstick and the toolstick base adapter together to develop your own application please refer to the ?an692: si4355/si4455 programming guide and sample code.? the demo boards come with the si4455 range test demo applic ation; however, be sure to use the latest version of the application. the user can update the firmware on the boards using the firmware update functionality of the wds. for more information on updating the firmware , refer to the "wds user 's guide for ezradio next generation".
si4455-2waylink-demo rev. 0.1 3 2. range test demo 2.1. basics as it was stated above range test demo is used to provide measured results on the quality of the rf link. the demo uses two rfstick one of them as the ?transmitter ? (tx) other as the ?receiver? (rx). both rfsticks can be either transmitters or receiver. the transmitter sends packets to the receiver repeatedly with half second interval. the packet includes address of the transmitter and number of the sent packet. the pa cket number increments from packet to packet. the receiver receives the packet and checks its address. if their addresses match packet number is stored. the receiver then sends back an acknowledge packet (ack) to the transmitter. ack packet also includes the address and the packet number of the received packet. per can be calculated with the following equation: the transmitter can calculate per using the following data: ?? p tx is the packet counter to be included in the packet ?? p rx is the number of all the received acknowledge packets the receiver can calculate per using the following data: ?? p tx is the packet number included in the last received packet ?? p rx is the number of all received data packets 2.2. rf and demo parameters this section provides information on the user parameters of the range test demo. all the parameters (excluding frequency band) can be changed in the demo through its menu system (see "2.4. menu system of the range test demo" on page 6). the following parameters are available: ?? frequency band (defined by the hw) ?? communication frequency (selected by the user) ?? node address (selected by the user) ?? modulation (selected by the user) ?? data rate (selected by the user) demo settings are stored in the mcu?s flash memory and restored after power on reset. default values are loaded if no settings were previously stored in the flash. it is also possible to define custom rf parameters fo r communication. custom parameters can be stored with the wireless development suit (wds). for more information on creation and storage of custom parameters, refer to the wds user?s guide for ezradio next generation. per p tx p rx ? p tx --------------------------- 100 ? where: per is the packet error rate (%) p tx is the number of sent packets p rx is the number of received packets =
si4455-2waylink-demo 4 rev. 0.1 2.3. frequency and frequency bands the rfstick provides rf matching solutions for all suppor ted frequency bands. different hw solutions are required for each frequency bands. range test demo automatically reads required frequency band information from the on board eeprom and selects the appropriate fr equency range. silicon labs provides si4455 two way demo link kits for the following frequency bands: ?? middle band: 425?525 mhz ?? high band: 850?960 mhz range test demo provides four different selectable fr equencies in all the supported bands. in case of custom parameters are stored the custom frequency can also be se lected, but only in the defined frequency band. table 2 lists the available frequencies. 2.3.1. node address each node using the range test demo can select from 16 different addresses (0-15). transmitter and receiver of the same link have to use the same addresses. it is advised to use only one link (one transmitter and one receiver) with the same address wit hin close proximity, otherwise the di fferent systems will disturb each other. 2.3.2. modulation user can select from three types of modulation: ?? gfsk with high precision tx crystal (tx: 30 ppm, rx: 30 ppm) ?? gfsk (tx: 150 ppm, rx: 30 ppm) ?? ook 2.3.3. data rate user can select from three different data rates. in case of custom settings are stored the custom data rate can also be selected. table 3 lists the available data rates. table 2. available frequencies freq. band middle high frequency number 0 custom custom 1 433.92 mhz 867.84 mhz 2 434.15 mhz 868.30 mhz 3 458.50 mhz 917.00 mhz 4 475.00 mhz 950.00 mhz table 3. available data rates modulation gfsk (both types) ook data rate number 0 custom custom 1 9.6 kbps 2.4 kbps 2 38.4 kbps 9.6 kbps 3 128.0 kbps 20.0 kbps
si4455-2waylink-demo rev. 0.1 5 2.3.4. custom parameters as it was stated above user can store custom rf para meters into the devices wit h wds. one custom field is available in each node. if any of the three rf parameters (frequency, modulation, data rate) is set to custom both the other parameters are configured to be custom as well. notes: ?? the firmware drops an error message and continues with default parameters if no custom field is stored, but custom parameter is selected. ?? the firmware goes to error state if the frequen cy band of the custom se ttings mismatches with the frequency band of the device. 2.3.5. default demo settings the default demo settings are as follows: ?? frequency band: defined by the hw ?? frequency number: ?? middle band: 1 ?? high band?868 mhz: 2 ?? high band?915 mhz: 4 ?? node address: 5 ?? modulation: high precision gfsk ?? data rate number: 1 (fsk: 9.6 kbps, ook: 2.4 kbps)
si4455-2waylink-demo 6 rev. 0.1 2.4. menu system of the range test demo range test demo provides a light-weight menu system (usi ng switches, push-buttons and leds of the rfstick) to control demo states and set parameters. the user can ch ange the state of the demo through the menu system with push-buttons. the actual state of the demo is shown on the leds. switches are used as inputs during parameter selection. the following abbreviations are used: ?? pbx: push-button x (x: 1?4) ?? swx: switch x (x: 1?4) ?? ledx: led x (x: 1?4) figure 3 shows the menu system and the available transitions. figure 3. range test demo menu system
si4455-2waylink-demo rev. 0.1 7 2.4.1. menu states 2.4.1.1. ready state in ready state the demo waits for command. this is the default state of the demo. the demo starts in ready state after switched on and goes to ready state after leaving the configuration menu. pb1 can push the demo to rx state. state display : ?? led3 is on ?? led1-led2 and led4 is off by default option : ?? pb1: switches to rx state 2.4.1.2. rx state in rx state the node waits for incoming packets with the same node address. if packet is received it sends ack packet and recalculates the per. state display : ?? led1 is on ?? led2?4 is off by default ?? led2 blinks if packet received ?? led3 & led4 shows the actual per (see table 4) ?? buzzer informs about actual per (see table 4) options : ?? pb1: switches to tx state ?? pb3: switches to ready state ?? pb4: resets per (only receiver?s per will be reset) ?? pb2 + pb4: switches to the configuration menu table 4. packet error rate on the leds and buzzer led3 led4 buzz per < 1% off off off per > 1% on off 1 hz per > 5% off on 2 hz per > 20% on on on
si4455-2waylink-demo 8 rev. 0.1 2.4.1.3. tx state in tx state the node sends packets to the receiver repea tedly with half second timeout including the node address. after sending the packet, transmitter waits for ack packet until the half second transmi t timeout. the transmitter recalculates its per after receivin g the ack packet or timeout occurred. state display : ?? all leds are off by default ?? led1 blinks if packet sent ?? led2 blinks if ack packet received ?? led3 & led4 shows the actual per (see table 3) ?? buzzer informs about actual per (see table 3) options : ?? pb3: switches to rx state ?? pb4: resets per (resets both the receiver?s and transmitter?s per) ?? pb2 + pb4: switches to the configuration menu 2.4.1.4. configuration menu the user can change demo parameters in the configuration menu. state display : ?? all leds blink together options : ?? pb1: switches to address configuration menu ?? pb2: switches to frequency configuration menu ?? pb3: switches to data rate configuration menu ?? pb4: switches to modulation configuration menu ?? pb2 + pb4: restores defaults 2.4.1.5. address configuration menu the user can set new node address in this menu state. state display : ?? led1 blinks set the configuration : ?? set the node address on the switches in binary format. ?? be aware that the direction of the switches is reve rsed than the bit locations in the binary number (lsb representation). ?? example: if the required node address is 10 (binary 1010 ), set sw2 & sw4 to on and sw1 & sw3 to off (see figure 4). figure 4. address configuration example (10) ?
si4455-2waylink-demo rev. 0.1 9 options : ?? pb1: ?? stores new settings ?? result : blinks all led once ?? next state : ready state 2.4.1.6. frequency configuration menu the user can set the communication frequency in this menu state. state display : ?? led2 blinks set the configuration : ?? set the frequency number on the switches by their frequency number: ?? custom : sw1?sw4 are on ?? freq. num. 1 : sw1 is on, all others are off ?? freq. num. 2 : sw2 is on, all others are off ?? freq. num. 3 : sw3 is on, all others are off ?? freq. num. 4 : sw4 is on, all others are off ?? in case of wrong selection is set or the selected fr equency number is not supported (e.g., no custom frequency is stored) the default frequency of the used frequency band will be selected. options : ?? pb2: ?? stores new settings ?? results : i. blinks all leds once if selection is ok. ii. blinks led4 and beeps buzzer once if the parameter had to be set to default because of an unsupported selection. ?? next state : ready state 2.4.1.7. data rate configuration menu the user can set the communication data rate in this menu state. state display : ?? led3 blinks set the configuration : ?? set the data rate number on the switches by their frequency number: ?? custom : sw1 ? sw4 are on ?? data rate num. 1 : sw1 is on, all others are off ?? data rate num. 2 : sw2 is on, all others are off ?? data rate num. 3 : sw3 is on, all others are off ?? in case of wrong selection is set or the selected data rate number is not supported (e.g. no custom data rate is stored) the default data rate will be selected. options : ?? pb3: ?? stores new settings ?? results : i. blinks all led once if selection is ok ii. blinks led4 and beeps buzzer once if parameter had to be set to default because of not supported selection ?? next state : ready state
si4455-2waylink-demo 10 rev. 0.1 2.4.1.8. modulation configuration menu the user can set the modulation in this menu state. state display : ?? led4 blinks set the configuration : ?? set one of the followings on the switches: ?? custom : sw1?sw4 are on ?? high precision gfsk : sw1 is on, all others are off ?? gfsk : sw2 is on, all others are off ?? ook : sw3 is on, all others are off ?? if the wrong selection is set or the selected data rate num ber is not supported (e.g., no custom data rate is stored), the default data rate (high precision gfsk) will be selected. options : ?? pb4: ?? stores new settings ?? results : i. blinks all leds once if selection is ok. ii. blinks led4 and beeps buzzer once if para meter had to be set to default because of an unsupported selection. ?? next state : ready state 2.4.1.9. restore defaults menu default demo settings are restored. ?? state display : ?? all leds blink once ?? next state : ?? ready state 2.4.1.10. error states in case of critical error the demo goes to error state. power-on-reset can reset the demo from error state. led4 is continuously on in error state. critical errors: ?? frequency band of the hw mismatches with fr equency band of the stored custom parameters. 2.5. how to use the range test demo put battery into the two rfstick devices and switch them on. both devices will start in ready state. select the required demo settings or start the measurements wit h the default or the automatically reloaded settings. switch one of the devices into rx and the other into tx state. check if transmitter sends packets and receiver answers as well. the range test could be performed inside a building if indoor propagation is tested. however it is advised to perform the test outside the building, line-of-sight to get the best possible range result. if per>1% reset the per on the transmitter and try to walk further in the area. it is usual that propagation cond itions get better if the user goes further from a possibly shadowed area.
si4455-2waylink-demo rev. 0.1 11 3. schematics schematics of the rfstick boards of the kit can be seen on the following pages. complete manufacturing file pack with ca d/cam files and boms can be found at silabs.com .
si4455-2waylink-demo 12 rev. 0.1
si4455-2waylink-demo rev. 0.1 13 n otes :
si4455-2waylink-demo 14 rev. 0.1 c ontact i nformation silicon laboratories inc. 400 west cesar chavez austin, tx 78701 tel: 1+(512) 416-8500 fax: 1+(512) 416-9669 toll free: 1+(877) 444-3032 please visit the silicon labs technical support web page: https://www.silabs.com/support/pages/contacttechnicalsupport.aspx and register to submit a technical support request. silicon laboratories and silicon labs are trademarks of silicon laboratories inc. other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders. the information in this document is believed to be accurate in all respects at the time of publ ication but is subject to change without notice. silicon laboratories assumes no responsibility for errors and omissions, and disclaims responsibi lity for any consequences resu lting from the use of information included herein. ad ditionally, silicon laboratorie s assumes no responsibility for the functioning of und escribed features or parameters. silicon laboratories reserves the right to make changes without further notice . silicon laboratories makes no wa rranty, rep- resentation or guarantee regarding the suitability of its products for any particular purpose, nor does silicon laboratories as sume any liability arising out of the application or use of any product or circuit, and s pecifically disclaims any and all liability, including wi thout limitation conse- quential or incidental damages. silicon laborat ories products are not designed, intended, or authorized for use in applications intended to support or sustain life, or for any other application in which the failure of t he silicon laboratories product could create a s ituation where per- sonal injury or death may occur. should buyer purchase or us e silicon laboratories products for any such unintended or unauthor ized ap- plication, buyer shall indemnify and hold silicon laboratories harmles s against all claims and damages.

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