ISSUE : 3.1 UPDATE :

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1 ISSUE : 3.1 UPDATE :

2 Dcument Histry Rev. Date Changed Page(s) Cause f Change Authr All sectins Creatin S. Guivarc h All sectins Update K. de Nie , 5-5, 5-11,7-4 Update K. de Nie Update K. de Nie , 5-2, 5-3 Update S. Guivarc h Sme minr changes Update K. de Nie , Warning Update S. Guivarc h Register Descriptin (S255) Update S. Guivarc h Signal Descriptin Crrectins S. Guivarc h All sectins One RF Technlgy update All sectins One RF Technlgy update X. Tatpuls X. Tatpuls COPYRIGHT One RF Technlgy 2004 Page: H-2 File:Manual_B868-tiny_e_v3.1.dc Rev: 3.1/

3 Prprietary Ntice: The infrmatin in this dcument is subject t change withut ntice. Cmpany r prduct names mentined in this dcument may be trademarks r registered trademarks f their respective cmpanies. All rights reserved. Neither the whle nr any part f the infrmatin cntained in this publicatin may be reprduced in any material frm except with the written permissin f One RF Technlgy. This publicatin is intended nly t assist the reader in the use f the prduct. One RF Technlgy shall nt be liable fr any lss r damage arising frm the use f any infrmatin in this publicatin, r any errr r missin in such infrmatin, r any incrrect use f the prduct. COPYRIGHT One RF Technlgy 2004 Page: H-3 File:Manual_B868-tiny_e_v3.1.dc Rev: 3.1/

4 WARNING: One RF Technlgy s B868-tiny radi mdule is a certified radi mdule and cmplies with R&TTE directives 1999/5/EC. Accrding t R&TTE directives, it is the respnsibility f One RF Technlgy s custmers (i.e. B868-tiny end user) t check that B868-tiny hst prduct (i.e. final prduct) is cmpliant with R&TTE essential requirements. Mrever, the use f a certified radi mdule (such as B868-tiny with micrcntrller and integrated antenna) can avid re-certificatin f the final prduct, prvided that the end user respects the directives and recmmendatins established by One RF Technlgy. Fr mre infrmatin, please refer t the B868-tiny integratin manual. COPYRIGHT One RF Technlgy 2004 Page: C-1 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.0/

5 Table f Cntents GLOSSARY INTRODUCTION AIM OF DOCUMENT GENERAL DESCRIPTION FUNCTIONAL BLOCKS AND FEATURES BLOCK DIAGRAM PINNING INFORMATION FUNCTIONAL DESCRIPTION RECEIVER TRANSMITTER MICROCONTROLLER Sftware I/O lines ADC ANTENNA CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS RECOMMENDED OPERATING CONDITIONS OPERATIONAL MODES AND CURRENT CONSUMPTION RECEIVER PROPERTIES TRANSMITTER PROPERTIES MICROCONTROLLER PROPERTIES INTEGRATED ANTENNA MECHANICAL MODULE PROPERTIES OPERATION HAYES OR AT MODE Standard cmmands descriptin REGISTERS DESCRIPTION OPERATING MODES Transparent Mde Transparent Secured Mde «Secured» link Algrithm Flw cntrl Addressed Secured Mde COPYRIGHT One RF Technlgy 2004 Page: C-2 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.0/

6 5.3.4 Basic illustratin f transparent mdes I/O Cpy mde Demnstratin mde Radi Test Cmmands INTEGRATING THE B868-TINY INTO YOUR APPLICATION ANTENNA POLARISATION ANTENNA GROUND PLANE ON HOST PCB MOUNTING RECOMMENDATIONS Hardware recmmendatins Pwer Supply Schematics example Munting the B868-tiny t the hst PCB Recmmended pad layut and hst bard cutut fr B868-tiny integratin APPENDIX ALTERNATIVE B868-TINY CONFIGURATIONS B868-TINY WITH EXTERNAL ANTENNA B868-TINY WITH DAC COPYRIGHT One RF Technlgy 2004 Page: C-3 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.0/

7 Illustratins Figure 1-1: B868-tiny Blck diagram Figure 2-1: Standard B868-tiny Pinning infrmatin Figure 4-1: Integrated Antenna Figure 4-2: B868-tiny dimensins Figure 5-1: Flw Cntrl Timing Diagram Figure 6-1: Optimal plarisatin f B868-tiny antennas with mdules at the same height Figure 6-2: Optimal plarisatin f B868-tiny antennas with mdules at different heights Figure 6-3: Antenna parameters Figure 6-4: Antenna Gain vs. W1 and L Figure 6-5: Optimal use f the antenna Figure 6-6: LC-Filter Figure 6-7: B868-tiny munting Figure 6-8: Hst bard cut-ut Figure 7-1: B868-tiny Pinning infrmatin Tables Table 2-1: Pin descriptin Table 5-1: Register descriptin Table 6-1: Recmmended values fr LC-Filter Table 7-1: Ordering infrmatin Table 7-2: Differences in pinning functins Table 7-3: Differences in pin descriptin B868-tiny with DAC Table 7-4: DAC Register infrmatin COPYRIGHT One RF Technlgy 2004 Page: C-4 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.0/

8 Glssary ADC CTS DAC dbm EEPROM FSK I/O ISM band LC-filter LO NRZ PCB PLL PSTN RAM RF ROM RTS SAW TBD TTL VCO Analg-t-Digital Cnverter Clear T Send Digital-t-Analg Cnverter decibel with respect t 1mW Electrically Erasable Prgrammable Read-Only Memry Frequency Shift Keying Input/Output Industrial Scientific and Medical band Inductr Capacitr-filter Lcal Oscillatr Nn Return t Zer Printed Circuit Bard Phase Lcked Lp Public Switched Telephne Netwrk Randm Access Memry Radi Frequency Read Only Memry Request T Send Surface Acustic Wave T Be Defined Transistr Transistr Lgic Vltage Cntrlled Oscillatr COPYRIGHT One RF Technlgy 2004 Page: G-1 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.0/

9 1 Intrductin 1.1 Aim f dcument The aim f this dcument is t present the technical aspects f the standard 1 B868-tiny radi mdule, named B868-tiny/10-SMD-IA. After a descriptin f the general and technical features f the radi mdule, the peratin as well as the integratin f the standard B868-tiny int yur applicatin will be set ut in detail in tw distinct chapters. The alternative cnfiguratins f the standard B868-tiny radi mdule are described in the Appendix. 1.2 General descriptin The B868-tiny mdule is a cmpletely integrated digital radi transceiver mdule fr the use in all kinds f applicatins where fast and reliable data transmissin is indispensable. It is a half duplex FSK transceiver perating in the licence free 868 MHz ISM band. A standard RS232 interface ensures a fast and easy integratin f wireless data transmissin int yur applicatin. The mdule cntains all RF and digital circuitry necessary fr transmissin and receptin f digital data ver a wireless link. The cntrl f bth transmit and receive functins is perfrmed by the integrated micrcntrller with EEPROM and ADC functinality. Fur additinal prgrammable I/O lines are available. Optinally, a dual 8 bit DAC is integrated in the B868-tiny mdule. The standard B868-tiny mdule cntains an integrated antenna. Typical system perfrmances parameters fr the receiver are a sensitivity f -101 dbm (± 1 dbm) and a data rate f 10 Kbits/s. The transmitter generates an utput pwer ranging frm 0 dbm t +7 dbm depending n the pwer supply vltage. The mdule cntains a metal RF shielding and is tested cnfrm ETS The addlink is available in a variety f cnfiguratins, each with different ptins (see chapter 7). The term standard refers t addlink-868-nb-a-mc. COPYRIGHT One RF Technlgy 2004 Page: 1-1 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.0/

10 1.3 Functinal blcks and features The blck diagram f the B868-tiny transceiver mdule is depicted in Figure 1. The fllwing functinal blcks can be distinguished: An FSK receiver with a sensitivity f -101 dbm (± 1 dbm) cmprising all necessary receive functins. An FSK transmitter with up t +7 dbm utput pwer (@5V). An antenna switch t be able t use ne antenna fr bth receptin and transmissin. Integrated antenna (ptinally, an external antenna may be used) An 8 bit Micrcntrller with 512 byte internal EEPROM, 8 Kbyte Flash and 1 Kbyte RAM. Additinal t this a dual 10 bit ADC and ptinal a dual 8 bit DAC is available. 1.4 Blck diagram Integrate d Antenna Data EEPROM 4 Digital I/O Receiver Cntrl Flash LNA SAW (Optinal) I2C Antenn a Micr- RF transceiver IC Dual switch Cntrller DAC Data RAM Transmitter Cntrl Dual ADC RS232 addlink Figure 1-1: B868-tiny Blck diagram COPYRIGHT One RF Technlgy 2004 Page: 1-2 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.0/

11 2 Pinning infrmatin Nt cnnected Gnd Gnd Gnd Gnd Gnd Gnd Gnd addlink-868-nb-a-mc Nt cnnected Nt cnnected Standby TxD RxD Reset MOSI_Prg/CTS MOSI_Prg/RTS Gnd Gnd Gnd Gnd Gnd Vcc Gnd Gnd ESL4 ESL3 ESL2 ESL1/Status_TxRx EA2 EA1 Vdd Clck_Prg/Ack_Tx Figure 2-1: Standard B868-tiny Pinning infrmatin NOTE: This pinning infrmatin is nly valid fr the standard B868-tiny. See paragraph 7.1 fr pinning infrmatin f alternative B868-tiny cnfiguratins. COPYRIGHT One RF Technlgy 2004 Page: 2-1 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.0/

12 Table 2-1: Pin descriptin Pin type is designated by A = Analg, D = Digital, I = Input, O = Output Pin Symbl Descriptin Type 1 Nt cnnected Recmmended t leave pen Gnd Grund Vcc Radi part pwer supply. Must be equal t Vdd Gnd Grund ESL4 Digital I/O N 4, cnfigurable as input r utput via Hayes register S260. D I/O 18 ESL3 Digital I/O N 3, cnfigurable as input r utput via Hayes register S260. D I/O 19 ESL2 Digital I/O N 2, cnfigurable as input r utput via Hayes register S260. D I/O ESL1 / Digital I/O N 1, cnfigurable as input r utput via 20 Status_TxRx Hayes register S260. Indicates whether the serial link is n data transmissin (high state) r data receptin (lw state). Can be used with a RS-485 chip. D I/O 21 EA2 ADC Input N 2. Value available via Hayes register S282. Vltage range between 0 and V DD. A I 22 EA1 ADC Input N 1. Value available via Hayes register S280. Vltage range between 0 and V DD. A I 23 Vdd Digital part pwer supply. Must be equal t Vcc Ack_Tx / Clck_Prg Indicates crrect buffer transmissin. The signal is activated at the end f a message transmissin n the radi (active RTS) and stays active until RTS switches t inactive state. Active (transmitted buffer) n lw state. During Flash and Eeprm prgramming: Input Clck. D O RTS / MISO_Prg CTS / MOSI_Prg Request T Send. During Flash and Eeprm prgramming: Output Data. Clear T Send. During Flash and Eeprm prgramming: Input Data. 27 Reset External hardware reset f the radi mdule. Active n lw state. See paragraph RxD RxD UART Serial Data Receptin Frmat NRZ/TTL: The 1 represents a high state. 29 TxD TxD UART Serial Data Transmissin Frmat NRZ/TTL: The 1 represents a high state. 30 Standby Switches the mdule t lw-pwer mde. Active n high state. 31 Nt cnnected Recmmended t leave pen Nt cnnected Recmmended t leave pen. - D O D I D I D I D O D I COPYRIGHT One RF Technlgy 2004 Page: 2-2 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.0/

13 3 Functinal descriptin 3.1 Receiver 3.2 Transmitter 3.3 Micrcntrller A shrt descriptin f the B868-tiny will be given based n the blck diagram f figure 1. The receive path starts at the antenna and after the antenna switch an LNA amplifies the signal with a minimum additin f nise. A bandpass SAW filter rejects the image frequency and signals utside the 868MHz band. Then the signal is amplified and dwn cnverted t the first IF frequency. After a lw pass filter the signal is quadrature dwn cnverted t base band. The I and Q signals are then filtered and tw limiter stages and a quadrature crrelatr cncatenated by a data filter and a data slicer reprduce the data t be received. This data is fed t the micrcntrller. The data t be transmitted is generated by the micrcntrller. This data is directly FSK mdulated t a MHz carrier. This mdulated signal is then amplified by a highly efficient pwer amplifier. Then the signal is fed t the antenna switch and is radiated by the antenna. The LO signal is internally generated by a VCO and PLL synthesizer. The micrcntrller cntrls the cmplete receiver and transmitter. This means that all RF transceiver IC cnfiguratin settings are prgrammed and the cntrl lines fr the antenna switch and LNA n/ff are set by this device. The micrcntrller als acts as an interface between RS232-data and the transmit and receive data. Additinal t this, the micrcntrller perates the antenna switch. Paragraph describes the functin f the I/O lines. The ADC functinality is explained in paragraph Sftware The B868-tiny is delivered with prgrammed Flash and EEPROM. Fr develpment purpses the pssibility exists t reprgram the micrcntrller. Fr reprgramming the fllwing pins have t be used: pin 24 (Clck_Prg), pin 25 (MISO_Prg) and pin 26 (MOSI_Prg). It is recmmended t use the B868- tiny Radi Mdule Dem Kit during develpment. The pssibility t reprgram the mdule is implemented n this bard. COPYRIGHT One RF Technlgy 2004 Page: 3-1 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.0/

14 3.3.2 I/O lines The B868-tiny has fur I/O lines that can each be cnfigured either as input r utput using register S260. These I/O lines are accessible (fr reading r writing, fr input respectively utput lines) thrugh register S270. The I/O lines can be used fr applicatin signaling prcesses (e.g. inidicatrs r sensrs). Using the user cnfigurable I/O lines f the B868-tiny mdule saves I/O pins n the user's applicatin hardware. The I/O cpy perating mde can be used t cpy the I/O frm a master mdule directly t the slave mdule. The I/O cpy sample rate is ptimised fr current cnsumptin and amunts 1 secnd ADC The ADC can be used t sample analg signals. These samples can be read by the micrcntrller and used fr the user applicatin (e.g. sensr reading). The B868-tiny cntains tw ADC inputs, EA1 (pin22) and EA2 (pin21). The supplied signal must have a value between 0 and Vdd. Activating f the ADC ccurs during start-up, and the ADC is deactivated in the Standby mde. The ADC value can be read via Hayes register S280 fr EA1 and S282 fr EA Antenna The standard B868-tiny cntains an integrated antenna. In rder t btain maximum antenna perfrmance, special care cncerning the grund plane underneath the antenna must be taken during design f the hst PCB. Paragraph 6.2 prvides recmmendatins cncerning this issue. Optinally, an external antenna can be used. COPYRIGHT One RF Technlgy 2004 Page: 3-2 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.0/

15 4 Characteristics 4.1 Abslute maximum ratings Symbl Parameter Min Max Units T stg Strage temperature C H rs Relative strage humidity 0 95 % CAUTION: ESD sensitive device, bserve handling precautin! 4.2 Recmmended perating cnditins Symbl Parameter Min Max Units T amb Ambient perating temperature V CC,V DD Supply vltage V Ripple TBD TBD mv H r Relative peratinal humidity % C 4.3 Operatinal mdes and current cnsumptin Tamb = 25 C; Vcc,Vdd = 5.0 V State Min Typ Max Units Standby Hardware ma Standby Sftware 4 ma Transmissin ma Receptin ma 4.4 Receiver prperties Nte: The fllwing characteristics are valid fr B868-tiny mdule with antenna. Specificatin Cnditins Typ Units Channel center frequency MHz Aggregate air data rate - 10 kbps Mdulatin type - FSK - Sensitivity CER < dbm Average CER Input signal -50 dbm < P 1dB CER < dbm Number f channels Selectivity At +/-150 khz 36 db Range Line f sight 300 m COPYRIGHT One RF Technlgy 2004 Page: 4-1 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.0/

16 Cnfrmity testing / Standard - ETSI Transmitter prperties Nte: The fllwing characteristics are valid fr B868-tiny mdule with antenna. Specificatin Cnditins Typ Units Channel center frequency MHz Aggregate air data rate - 10 kbps Mdulatin type - FSK - Output Vcc = 3.0 V - 0 dbm Output Vcc = 5.0 V - 7 dbm Number f channels Range Line f sight 300 m Cnfrmity testing / Standard - ETS Micrcntrller prperties Specificatin Typ Units Type 8 bit Flash memry 8 kbyte RAM memry 1 kbyte EEPROM memry 512 byte Baud rate bits/s I/Os 4 TTL 3..5V ADC 2 Reslutin Serial link Flw cntrl 10 bits NRZ frmat Full duplex TTL 3..5V RS232 RTS, CTS TTL 3..5V COPYRIGHT One RF Technlgy 2004 Page: 4-2 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.0/

17 4.7 Integrated antenna Specificatin Cnditins Typ Units Resnating frequency MHz Bandwidth % Impedance - 50 Ohm Gain - > -6 dbi Depending n grund plane and placement. Hrizntal / Vertical - Plarisatin Dimensins - 32 x 17 x 4 mm Material - Tinned brass 3D Figure 4-1: Integrated Antenna COPYRIGHT One RF Technlgy 2004 Page: 4-3 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.0/

18 4.8 Mechanical mdule prperties Specificatin Units Dimensins 38 x 21 x 0.8 mm PCB 4 FR4 layers Shielding cap Thickness Height um mm Weight Apprx. 5 g Figure 4-2: B868-tiny dimensins COPYRIGHT One RF Technlgy 2004 Page: 4-4 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.0/

19 5 Operatin 5.1 Hayes r AT Mde The Hayes r 'AT' cmmands cmply with the Hayes prtcl used in PSTN mdem standards. This AT prtcl r Hayes mde is used t prgram the mdem parameters, based n the fllwing principle: A data frame always begins with the 2 ASCII AT characters, standing fr ATtentin. Cmmands are cded ver ne r several characters and may include additinal data. A cmmand is always ended by a <CR> Carriage Return. A T Cmmand Additinal cmmand... <CR> Nte: Register numbers and values used in the AT cmmands are in decimal frmat. The nly exceptin t this data-framing rule is the cmmand t enter the enter AT-mde. In this case, nly the escape cde ( +++ by default) must be typed and fllwed by a silent time at least equal t the time ut. <AT> and <CR> shall nt be used. Nte: The time between 2 characters f the same cmmand must be less than 10 secnds. Despite its similarity t standard telecmmunicatin mdems, the B868-tiny radi mdule remains a radi link mdem and is cnsequently fitted with sme particular additinal AT cmmands Standard cmmands descriptin '+++' Enter AT-mde. This cmmand gives an instant access t the mdem parameter set-up (Hayes r AT-mde), whatever the actual perating mde in prcess might be. This cmmand shall nt be started with AT, but by a silent time duratin whse parameter entering is defined in millisecnds in Register S214. N.B.: By activating the AT-mde, the B868-tiny radi mdule inactivates radi receptin. ATO Exit AT-mde COPYRIGHT One RF Technlgy 2004 Page: 5-1 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.1/

20 This cmmand activates the perating mde as stred int register S220. 'ATSn?' Display value f register n. The B868-tiny radi mdule perating parameters are stred in S classified Registers. S Registers are numbered frm 0 t 512. Sme parameters are standard fr every Hayes type mdems, ther are specific t the B868-tiny radi mdule. (See Table 5-1). Operating parameters are stred in EEPROM memry and autmatically set-up during mdem reset and mdem turn n. 'ATSn=m : Change value f register n t m. Changed values f registers are autmatically stred in the mdem EEPROM memry. 'AT/S : 'AT/V : 'ATR : 'ATP : Display values f Significant Registers. All significant registers fr the mdem (radi cnfiguratin, serial cnfiguratin, perating mde,) are sent t the serial link, ready t be displayed by sftware like Windws «Terminal». Display values f the Mdem Sftware versin. Infrmatin cncerning the versin number and installatin date is sent n the Serial Link; ready t be displayed by Sftware like Windws «Terminal». Hayes registers reset t default values This cmmand allws the user t reset ALL the stred EEPROM registers t their default values (see registers descriptin belw). Switch t Stand-by mde This cmmand allws the user t switch t Stand-by mde. The Mdem is in Nrmal Mde by default. The Mdem switches back t Nrmal Mde with a character receptin frm the Serial link. Unless therwise specified, after an AT cmmand the mdule answers O fr OK, r E fr Errr. 5.2 Registers descriptin The B868-tiny radi mdule can ffer several pssible cnfiguratins using a set f parameters. Thse parameters are lcated in registers and have a default value. This value can be mdified r cnsulted via Hayes cmmands. The parameters f the radi mdule are stred in the EEPROM and can therefre be changed up t 10,000 times. The parameters are available when switching n the mdule. The registers are listed belw: COPYRIGHT One RF Technlgy 2004 Page: 5-2 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.1/

21 Table 5-1: Register descriptin. Access Register Name Descriptin Radi R S200 Channel N Used t indicate the current radi channel. As B868- tiny is a single channel mdule, the register is nly present fr cmpatibility with MC/MCsmart units. Default value: 0 R/W S204 Carrier Length Indicates the radi carrier length in millisecnds, sent at the beginning f each radi frame. Valid between 4 and 50 millisecnds. Default value: 25 ms (i.e. S204=25) Serial Link R/W S210 Baud Rate Indicates the serial link rate: Value Rate '1' -> 1200 Bits/s '2' -> 2400 Bits/s '3' -> 4800 Bits/s '4' -> 9600 Bits/s '5' -> Bits/s (Default value) '6' -> Bits/s R/W S211 Data Length Indicates the number f data bits n the serial link: '7' -> 7 data bits. '8' -> 8 data bits (Default value) R/W S212 Parity Indicates the parity n the serial link: '1' -> N parity (default value) '2' -> Even Parity '3' -> Odd Parity R/W S213 Number f Stp Bits Number f Stp bits n the serial link: '1' -> 1 Stp bit (default value) '2' -> 2 Stp bits R/W S214 Time-ut Time-ut in millisecnds n the serial link. Valid between 2 and 100 millisecnds. Default value: 5 ms R/W S216 Flw Cntrl Indicates the flw cntrl mde: 0 -> RTS/CTS 2 -> Nne (Default value) R/W S218 Buffer size Indicates the maximum size f frames. When this maximum size is reached, the mdule switches the CTS signal. Valid between 30 and 245 bytes. Default value: 245 bytes COPYRIGHT One RF Technlgy 2004 Page: 5-3 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.1/

22 Access Register Name Operatin R/W S220 Operating Mde Descriptin Indicates the peratin mde f the mdule. '1' -> Transparent (Default value) '3' -> Transparent Secured 6 -> Master I/O 7 -> Slave I/O '9' -> Addressed Secured 10 -> Dem mde master 11 -> Dem mde slave R/W S221 Autrepeat Indicates aut-repeat status in transparent mde (i.e. whether the mdule autmatically replies a data frame) 0 -> Autrepeat ff (Default value) 1 -> Autrepeat n R/W S223 Number f Retries Addressed Management R/W S250 Netwrk Number Indicates the maximum number f retries when a message cntains errrs in secured mde. Valid between 0 and 255 (mdul 256). If the value is 0, frames are nt checked and cnsidered as gd (used fr tests). Default value: 2 Indicates the netwrk number using 2 bytes. Only members f the same netwrk can cmmunicate tgether. Valid between 0 and (mdul 65536), it is set t 0 when the mdule is nt initialised. NB: Setting S250 t 0 als sets S252 t 0. Default value: 0 R/W S252 Client Number Indicates the client number using 1 byte. The client number is unique fr a given netwrk. Valid between 0 and 255 (mdul 256), it is set t 0 when the mdule is nt initialised. Default value: 0 COPYRIGHT One RF Technlgy 2004 Page: 5-4 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.1/

23 Access Register Name Descriptin R/W S256 Default addressee I/O Management R/W S260 Digital I/O cnfiguratin (ESL1 t ESL4) R/W S270 Digital I/O values (ESL1 t ESL4) R S280 EA1 ADC Input N 1 Value R S282 EA2 ADC Input N 2 Value 5.3 Operating mdes In addressed secured mde, indicates the address t which every radi frame will be sent t (default address). Default value: 0. Allws cnfiguring the digital I/O as input r as utput. Each I/O is independent f thers and is represented by tw bits f that register. ESL4 ESL4 ESL3 ESL3 ESL2 ESL2 ESL1 ESL1 Bits t 00 => I/O prt equivalent t digital input (default value) Bits t 01 => I/O prt equivalent t digital utput Bits t 10 => I/O prt dedicated Bits t 11 => I/O prt used fr DAC E.g.: S260=4 means ESL1, 3 and 4 cnfigured as input; ESL2 cnfigured as utput Allws writing and reading f digital I/O prts, accrding t their cnfiguratin (See abve). Each prt, i.e. each bit, can be either written r read with digital values 1 (equivalent t VDD) r 0 (equivalent t 0 vlts). Included between 0 and 15 (register). Default value: 0 Indicates the analg input prt value n 10 bits. A single cnversin is started during read f this register and the result is send ver the serial link. Value between 0 and 1023, with 1023 = VDD. Indicates the analg input prt value n 10 bits. A single cnversin is started during read f this register and the result is send ver the serial link. Value between 0 and 1023, with 1023 = VDD. The B868-tiny is able t perate in ne f the fllwing mdes: Transparent. Transparent Secured. Transparent Addressed Secured. I/O Cpy mde (Master and Slave). Dem mde (Master and Slave). The mde that is t be used can be prgrammed via Hayes register S220. The peratin f the different mdes is explained in detail in the fllwing paragraphs. COPYRIGHT One RF Technlgy 2004 Page: 5-5 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.1/

24 5.3.1 Transparent Mde In Transparent Mde, the B868-tiny radi mdule behaves like a wired serial link : I.e. the B868-tiny radi mdule des nt nly transmit t the radi channel every data received n the serial link, but als transmits n the serial link the infrmatin received n the radi channel. Basically the B868-tiny radi mdule, as a half-duplex mdule, reprduces the half-duplex functin f a RS-485 cable. There is n flw cntrl perfrmed by the B868-tiny mdule in the transparent mde, neither n the serial link nr n the radi link. Flw cntrl must be carried ut by sftware applicatins via varius prtcls in use such as MODBUS, JBUS, etc Cnsequently, in Transparent Mde it is nt pssible t change the mdule parameters withut a temprary return t Hayes mde. NOTE: Transparent Secured Mde The user s sftware applicatin must adequately verify that all buffers are transmitted crrectly taking int accunt that an interrupted transmissin link may lead t lsing ne r several buffers. In rder t cnfirm the crrectness f the transmitted data frames, a data flw cntrl between the radi mdules is added t the Transparent Mde, s that each data transfer is data verified. This mde shall be perated fr pint-tpint cmmunicatins nly. Transparent Secured Mde r Transparent «Data Verified» Mde s purpse is t ffer an ptimal radi link quality and t prvide transparent mde with the necessary security in case flw cntrl wuld nt be included within the user s applicatin sftware. The risk f data lss is much lwer than during the use f applicatin sftware nly because this latter is dependent n the intermediate times inserted by the serial link. Mrever, a flw cntrl is perfrmed n the serial link in rder t warn the user that the buffer (including 245 characters) is saturating. The warning level is default set t 245 characters and can be prgrammed via register S218. NOTE: The user s sftware applicatin must adequately verify that all buffers are transmitted crrectly taking int accunt that an interrupted transmissin link may lead t lsing ne r several buffers. After N Time repetitin f a buffer (N prgrammable up t 255 with S223) withut a crrect acknwledgement the buffer shall be cnsidered as lst «Secured» link Algrithm 1. The transmitting B868-tiny radi mdule prceeds t data framing: COPYRIGHT One RF Technlgy 2004 Page: 5-6 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.1/

25 Transferred Data Cunt up. Transferred Data Frame Type. Frame number. Data t be transmitted. 16 bits Checksum. 2. The receiving B868-tiny radi mdule analyses this data frame and checks its cnsistency. When the data frame is received crrectly, the receiver transmits an acknwledgement back t the transmitter, and delivers the received data framing t its serial link. In case the receptin is nt withut errrs, the receiver requests a new framing transmissin t the transmitter. The number f repetitins depends n the parameter prgrammed in the mdem cnfiguratin (Register S223). At serial prt level, each transmitted data frame is «Data Verified», but n statement asserts t the user whether the data frame has been transmitted yet r nt. In «Transparent Secured Mde», a time-ut is defined t indicate the end f a frame. This time-ut is a prgrammable parameter (Register S214) separating each frame frm the next ne. COPYRIGHT One RF Technlgy 2004 Page: 5-7 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.1/

26 Flw cntrl Tw types f flw cntrl are available: Hardware: CTS/RTS (the mdule manages RTS signal nly). Nne Register S216 can be used t prgram this parameter: '0' stands fr hardware flw cntrl. '2' indicates n flw cntrl. Figure 5-1 shws a flw cntrl timing diagram f bth types f flw cntrl. Serial Rx Frame > buffer si ze Frame < buffer size Time-Out (S214) Serial RTS Radi Transmissin Transmissi n Figure 5-1: Flw Cntrl Timing Diagram COPYRIGHT One RF Technlgy 2004 Page: 5-8 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.1/

27 5.3.3 Addressed Secured Mde The Addressed Secured Mde is similar t a client/server netwrk mde, the difference is that there is n server and all clients can cmmunicate with each ther. Addressed secured mde s purpse is t ffer an ptimal radi link quality and t prvide transparent mde with the security f the secured mde. This transparent addressed secured mde includes the additinal feature t use an address field t address ne particular client. Data Management is as fllws: Data transmissins are fully «Data Verified». The mdem acts as in transparent mde, adding frame encapsulatin. Identificatin f clients with a specific number added at the beginning f each data frame. Example: "1=Hell" sends the data frame "Hell" t Client N.1. The receiver client recgnises the client transmitting mdem by the number starting the data frame. Example: "002=Hell" indicates that data frame "Hell" cmes frm Client N.2. Yu can add ne frame ending character: Carriage Return<CR>, after each received frame. This in rder t distinguish each frame. Example: "002=1458<CR> 003=4587<CR>" indicates data frame "1458" cmes frm Client N.2, and data frame "4587" cmes frm Client N.3. N server, each client can cmmunicate with each ther. Maximum f clients per netwrk = 255, maximum f netwrks = The data frame frmat can be cnfigured (client ID at beginning, CR at end, One RF Technlgy mdems frame frmat cmpatibility) via register S255. COPYRIGHT One RF Technlgy 2004 Page: 5-9 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.1/

28 5.3.4 Basic illustratin f transparent mdes Transparent mde Serial Link N.1 : <ABCD> -> <ABCD> : Serial Link N. 2 Serial Link N.1 : <FGHI> <- <FGHI> : Serial Link N. 2 Transparent secured mde Serial Link N.1 : <ABCD> -> <ABCD> : Serial Link N. 2 ACK <- ACK Serial Link N.1 : <RSTU> -> <RDTU> : Serial Link N. 2 NACK <- NACK <RSTU> -> <RSTU> : Serial Link N. 2 ACK <- ACK Serial Link N.1 : <FGHI> <- <FGHI> : Serial Link N. 2 ACK -> ACK Transparent addressed secured mde Serial Link N.1 : 2=<ABCD> -> 1=<ABCD> : Serial Link N. 2 ACK <- ACK Serial Link N.1 : 2=<RSTU> -> 1=<RDTU> : Serial Link N. 2 NACK <- NACK 2=<RSTU> -> 1=<RSTU> : Serial Link N. 2 ACK <- ACK Serial Link N.1 : 2=<FGHI> <- 1=<FGHI> : Serial Link N. 2 ACK -> ACK COPYRIGHT One RF Technlgy 2004 Page: 5-10 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.1/

29 5.3.5 I/O Cpy mde In I/O Cpy mde the I/O lines f an B868-tiny mdule are cpied t the ther B868-tiny mdule. The fllwing registers have t be prgrammed: Master: S220=6 and S260 fr the I/O cnfiguratin. Slave: S220=7 and S260 fr the I/O cnfiguratin ( cmplementary cnfiguratin accrding t master) Once cnfigured as abve, bth mdules start I/O cpy as sn as the mdules get ut f Hayes mde (ATO cmmand). This mde wrks as fllws: NOTE: The master sends its input values t the slave. The slave sends an Ack t the master when the input data arrived. The slave cpies the master s input n its utput. After a 100 ms time-ut, the slave sends its inputs t the master. The master returns an Ack when the input data is arrived. The master cpies the slave s inputs t its utputs. After a 100 ms time-ut, the master sends its inputs t the slave. And s n When an B868-tiny with DAC is used (See paragraph 7.3) als the master ADC value is cpied t the slave DAC and vice versa. When an B868-tiny withut DAC is used the ADC value will nt be transferred. The I/O Cpy mde stps as sn as the mdule returns t Hayes mde (+++ cmmand) Demnstratin mde A demnstratin perating mde is available n the B868-tiny radi mdule. It requires the peratin f the B868-tiny dem kit and allws the user t test the peratin f the B868-tiny radi mdule. Basically it shall be used fr perfrmance range tests as it allws remving the serial cnnectin and mving the radi mdule arund. T cnfigure the mdule t dem mde, nly the perating mde S220 needs t be mdified: If S220 is set t 10 (ATS220=10<CR>), the unit is cnfigured as Master in Dem mde. A master is equivalent t a netwrk server, its netwrk including nly ne unique client (Server/single client netwrk). If S220 is set t 11 (ATS220=11<CR>), the unit is cnfigured as Slave in Dem mde. A slave is equivalent t the unique netwrk client f the Server/single client netwrk described abve. COPYRIGHT One RF Technlgy 2004 Page: 5-11 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.1/

30 The dem mde is similar t a Master and Slave mde, but the units are cmmunicating cntinuusly: The master sends data frames t the slave and its yellw LED is flashing If the data is crrectly received, the slave lights its green LED, sends back the data t the master and its yellw LED is flashing If the data is received with errrs, the slave lights its red LED If the master crrectly receives back a data frame, it lights its green LED and restarts the prcess after 100 ms. If the master receives a frame with errrs r desn t receive any frame after a 50ms time-ut, it lights its red LED. After 100 ms, the master restarts the prcess Radi Test Cmmands These special AT cmmands are integrated in the B868-tiny radi mdule in rder t make measurements during cntinuus transmissin, and are primarily used during radi tests (radiated pwer, bandwidth, etc.) t shw cnfrmance t the ETS standard. It stps when any character is sent: ATT0 <CR>: Transfer f a pure carrier 0 ATT1 <CR>: Transfer f a pure carrier 1 ATT2 <CR>: ATT3 <CR>: ATT4 <CR>: Transfer f a mdulated carrier at F(maximum) Transfer f a mdulated carrier at F(average) Transfer f a mdulated carrier at F(minimum) COPYRIGHT One RF Technlgy 2004 Page: 5-12 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.1/

31 6 Integrating the B868-tiny int yur applicatin 6.1 Antenna plarisatin In rder t realize the maximum pssible range between tw B868-tiny mdules the antenna plarisatin is f imprtance. The antenna plarisatin defines the electric field vectr. The maximum field strength is in the hrizntal plane when the B868-tiny antenna is vertically plarised. Best perfrmance is reached when the plarisatin f the transmitting and the receiving antenna are equal. The antenna can be plarised vertically r hrizntally. The best plarisatin fr yur applicatin depends n the placement f the B868-tiny mdules. In general the fllwing tw situatins can be distinguished: If bth B868-tiny mdules perate at the same height (see Figure 6-1), ptimal range shuld be realised when the antennas f bth mdules are vertically plarised. If ne B868-tiny mdule is situated abve anther B868-tiny mdule (see Figure 6-2), ptimal range shuld be realised when bth mdules are hrizntally plarised. addlink N1 addlink N2 Figure 6-1: Optimal plarisatin f B868-tiny antennas with mdules at the same height COPYRIGHT One RF Technlgy 2004 Page: 6-1 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.1/

32 addlink N2 addlink N1 Figure 6-2: Optimal plarisatin f B868-tiny antennas with mdules at different heights Anther antenna characteristic is the antenna gain, fr ptimal perfrmance this parameter must be as large as pssible. The way t ptimise antenna and plarisatin fr the applicatin is explained in the fllwing paragraphs. 6.2 Antenna grund plane n hst PCB An imprtant part f the antenna frms the grund plane underneath the antenna. Because this grund plane isn t part f the B868-tiny mdule itself but must be prvided by the hst PCB special care is needed during design f this PCB. The grund plane has influence n the fllwing tw parameters: Antenna plarisatin Antenna gain T find the ptimal antenna perfrmance, experiments with different grund plane dimensins have been perfrmed. The fllwing grund plane dimensins are defined: W1 W2 L1 L2 COPYRIGHT One RF Technlgy 2004 Page: 6-2 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.1/

33 W2 L1 addlink with integrated antenna L2 W1 grundplane Figure 6-3: Antenna parameters The cnclusins frm the experiment are as fllws: The grund plane can be lcated indifferently n the tp side r the bttm side. W2 and L1 can be small as their influence n the antenna s electrical perfrmances is weak. They are therefre fixed t a shrt dimensin f 10 mm. W1 and L2 are imprtant and strngly influence the antenna s electrical perfrmances. T get a hrizntal plarisatin, W1 has t be maximised. T get a vertical plarisatin, L2 has t be maximised. T increase the antenna s gain, W1 r L2, r W1 and L2 have t be maximised. COPYRIGHT One RF Technlgy 2004 Page: 6-3 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.1/

34 The fllwing diagram shws the gain s evlutin when W1 and L2 are increased (10 t 70 mm) and summarise the characteristics f the antenna: Gain in dbi L2 in mm W1= 10 mm W1 = 30 mm W1 = 50 mm W1 = 70 mm Figure 6-4: Antenna Gain vs. W1 and L2 The diagram clearly shws that the gain increases with W1 and L2. Therefre, the lnger W1 and L2, the better the antenna s electrical perfrmance will be. Actually, the plarisatin als needs t be cnsidered, i.e. a prper W1-L2 cmbinatin needs t be chsen t get the desired plarisatin (vertical r hrizntal). The table shwn belw details the different cmbinatins t get a pure plarisatin fr an ptimal radiatin: Therefre, W1 must be much smaller than L2 t get a gd vertical plarisatin and much larger than L2 t get a gd hrizntal plarisatin. COPYRIGHT One RF Technlgy 2004 Page: 6-4 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.1/

35 The fllwing table shws the tw ptimal cnfiguratins f the B868-tiny antenna: W2 L1 addlink with integrated antenna L2 W1 grundplane VERTICAL POLARISATION L2 > 50 mm W1 =10 mm W2 = 10 mm L1 = 10 mm G > -5 dbi L2 > 70 mm G > -4 dbi E HORIZONTAL POLARISATION W2 = 10 mm L1 = 10 mm L2 = 10 mm W1 > 50 mm G > -4 dbi W1 > 70 mm G > -2 dbi Figure 6-5: Optimal use f the antenna The best perfrmance fr vertical plarisatin is realised with L2 > 70 mm the antenna gain is then >-4 db, when the size f the hst PCB is a critical factr it is pssible t reduce L2 t 50 mm, the antenna gain is then reduced t >-5 db. Fr hrizntal plarisatin the ptimum antenna gain f -2 db is btained with W1 >70 mm, a reduced hst grund plane with W1 > 50 mm results int a gain >-4 db. Nte: When the integrated antenna is used, the B868-tiny radi mdule shuld nt be placed in a metallic casing r clse t metallic devices. COPYRIGHT One RF Technlgy 2004 Page: 6-5 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.1/

36 6.3 Munting recmmendatins Hardware recmmendatins Pwer Supply The pwer supply fr switching circuits (especially the RS-232/TTL interface circuit) must be decupled with a tantalum capacitr as clse as pssible t the switching circuits. An LC filter (see Figure 6-6 and Table 6-1) must be placed as clse as pssible t the radi mdule pwer supply pins, i.e. radi part pwer supply (V CC r B868-tiny pin 14) and digital pwer supply (V DD r B868-tiny pin 23). Supply vltage frm hst L1 C1 C2 addlink Vcc = pin 14 & Vdd = pin 23 Figure 6-6: LC-Filter Symbls Reference Value Manufacturer L1 LQH1C1R0M04 1µH Murata C1 GRM235Y5V226Z10 22µF Murata C2 Ceramic CMS 25V 100nF Multiple Table 6-1: Recmmended values fr LC-Filter The radi mdule grund pins must be cnnected t a slid grund plane. If the grund plane is n the ppsite side, a via must be used fr each grund pin. COPYRIGHT One RF Technlgy 2004 Page: 6-6 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.1/

37 Schematics example Schematic example 1: Minimum cnnectins fr RS-232 cmmunicatin COMMENTS: Schematic fr typical PC cnnectin Reset: Internal pull-up resistr. N cnnectin needed Stand-by: Internal pull-dwn resistr. N cnnectin needed COPYRIGHT One RF Technlgy 2004 Page: 6-7 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.1/

38 Schematic example 2: Full cnnectins fr RS-232 cmmunicatin COMMENTS: Schematic fr cmplete PC cnnectin addlink reflashing pssible using One RF Flash dngle LD3 blinking when addlink pwered n Reset: internal pull-up resistr Stand-by: internal pull-dwn resistr COPY RIGHT ESL1 One t ESL4: RF Technlgy Lgic I/O ( t Vdd) Page: 6-8 File: Manual_B868-tiny_e_v3.1.dc EA1 & EA2: Analg input. 10-bit precisin Rev: 3.1/ SA1 & SA2: Analg utput. 8-bit precisin when DAC used

39 Schematic example 3: Full cnnectins fr cmmunicatin with micr-cntrller r sensr COPYRIGHT One RF Technlgy 2004 Page: 6-9 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.1/

40 COMMENTS: Schematic fr cmplete micr-cntrller / sensr cnnectin addlink reflashing pssible using One RF Flash dngle Reset: internal pull-up resistr Stand-by: internal pull-dwn resistr ESL1 t ESL4: Lgic I/O (0 t Vdd) COPY R EA1 IGHT & One EA2: RF Analg Technlgy input. 10-bit 2004 precisin Page: 6-10 File: M anual_b868-tiny_e_v3.1.dc SA1 & SA2: Analg utput. 8-bit precisin Rev: 3.1/ when DAC used

41 6.3.2 Munting the B868-tiny t the hst PCB slder dt hst PCB Cut ut n hst Integrated antenna addlink mdule SMD area brace slder dt hst PCB Cut ut n hst Figure 6-7: B868-tiny munting Recmmended pad layut and hst bard cutut fr B868-tiny integratin Figure 6-8: Hst bard cut-ut The size f the hst bard cutut is x mm. Dn t frget t implement the grund plane n the hst PCB as described in paragraph 6.2. COPYRIGHT One RF Technlgy 2004 Page: 6-11 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.1/

42 7 Appendix 7.1 Alternative B868-tiny cnfiguratins Table 7-1: Ordering infrmatin Radi Mdule Reference Optins cde Antenna Micr- DAC cntrller B868-tiny/10-SMD-IA O O - B868-tiny-NB-A O - - B868-tiny-NB B868-tiny/10-SMD-WA O - B868-tiny-NB-A-MC-DAC O O O B868-tiny-NB-MC-DAC O O Dem Kit Reference Radi mdule Optins cde Antenna Micr- DAC cntrller DB868-tiny/10-SMD-IA O O - D868-tiny-NB-A O - - D868-tiny-NB DB868-tiny/10-SMD-WA O - The first versin f this table, the B868-tiny/10-SMD-IA is described in the preceding chapters. A separate manual including additinal infrmatin cncerning the B868-tiny versins withut micrcntrller (B868-tiny-NB-A & B868-tiny-NB) is available with the B868-tiny sftware develpment kit (SDK). The difference between B868-tiny with and withut antenna is described in paragraph 7.2. Additinal infrmatin describing the B868-tiny with DAC can be fund in paragraph 7.3. Table 7-2 describes the differences in pinning infrmatin fr the B868-tiny mdules cmpared t the B868-tiny/10-SMD-IA infrmatin as described in chapter 2. Mst functins are identical and fr this reasn nly the differences are given. COPYRIGHT One RF Technlgy 2004 Page: 7-1 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.1/

43 Pin1* 1 Gnd 2 Gnd 3 Gnd 4 Gnd 5 Gnd 6 Gnd Gnd 7 8 Pins with * have different functins depending n cnfiguratin. B868-tiny-NB-x-MC-x d n d d d d d G n c d n n n n n 7 * 8 * 9 * G G G G V G G n P i n P i n P i R x T x u s a t S t 1 / L S E 2 A E 1 A E d V T x A c k g / P r c k C l *Pin 32 *Pin 31 Standby TxD RxD Reset MOSI_Prg/CTS MOSI_Prg/RTS Figure 7-1: B868-tiny Pinning infrmatin Table 7-2: Differences in pinning functins Cnfiguratin Pin N. Symbl B868-tiny/10-SMD-IA Pin 1 Nt cnnected Pin 17 ESL4 Pin 18 ESL3 Pin 19 ESL2 Pin 31 Nt cnnected Pin 32 Nt cnnected B868-tiny/10-SMD-WA Pin 1 External antenna Pin 17 ESL4 Pin 18 ESL3 Pin 19 ESL2 Pin 31 Nt cnnected Pin 32 Nt cnnected B868-tiny-NB-A-MC-DAC Pin 1 Nt cnnected Pin 17 Data_SPI Pin 18 Clck_SPI Pin 19 CS_SPI Pin 31 SA1 Pin 32 SA2 B868-tiny-NB-MC-DAC Pin 1 External antenna Pin 17 Data_SPI Pin 18 Clck_SPI Pin 19 CS_SPI Pin 31 SA1 Pin 32 SA2 COPYRIGHT One RF Technlgy 2004 Page: 7-2 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.1/

44 7.2 B868-tiny with external antenna The B868-tiny radi mdule can be munted with an external antenna instead f the standard integrated antenna. Obviusly, sme recmmendatins need t be cnsidered: See paragraph 6.3.1, as thse are still valuable fr a design with an external antenna. The area lcated under the B868-tiny radi mdule (35.6 x 19.6 mm) must be free f grund plane, tracks, mechanical pieces, etc, as n the B868- tiny interface/evaluatin bard (See Table 7-1: Ordering infrmatin) An anti-slder mask is necessary in this area as n the B868-tiny interface/evaluatin bard. A matching circuit must be established n the hst bard between the 50 hms antenna utput f the B868-tiny and the antenna. This matching circuit, t tune the external antenna, must be placed as clse as pssible t the B868-tiny antenna utput and the antenna cnnectin. Fr ptimal perfrmance fllw the guide lines fr the grund plane as described in chapter 6.2. The grund plane must be lcated underneath the trace between B868- tiny and antenna and underneath the matching circuit. COPYRIGHT One RF Technlgy 2004 Page: 7-3 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.1/

45 7.3 B868-tiny with DAC An ptinal DAC can be integrated int the standard B868-tiny radi mdule. The DAC is a duble 8 bits versin with an analg utput between 0 and the supply vltage. The differences between the standard B868-tiny and the B868-tiny with DAC cncern the fllwing signal pins and functins. Cmpared t the pin descriptin f the standard B868-tiny the differences are as fllws: Table 7-3: Differences in pin descriptin B868-tiny with DAC Pin type is designated by A = Analg, D = Digital, I = Input, O = Output Pin Symbl Descriptin Type 17 Data_SPI D nt cnnect! This signal is cnnect - inside the B868-tiny mdule! 18 Clck_SPI D nt cnnect! This signal is cnnect - inside the B868-tiny mdule! 19 CS_SPI D nt cnnect! This signal is cnnect - inside the B868-tiny mdule! 31 SA1 Analg DAC utput N 1 O 32 SA2 Analg DAC utput N 2 O The fllwing registers are used fr the DAC utputs: Table 7-4: DAC Register infrmatin Access Register Name I/O Management R/W S262 Analg I/O cnfiguratin R/W S272 SA1 Analg Output Prt Value R/W S274 SA2 Analg Output Prt Value Descriptin Indicates whether the DAC is used r nt. '[0x00]' -> DAC ff (Default value) '[0x03]' -> DAC n Indicates the analg prt value n 8 bits. Valid between 0 and 255, with 255 = VDD. Default value: 0 Indicates the analg prt value n 8 bits. Valid between 0 and 255, with 255 = VDD. Default value: 0 During the I/O cpy perating mde the ADC value f the master is transferred t the DAC utput f the slave and vice versa. The I/O cpy sample rate is 1 secnd. When perating in ne f the remaining mdes the value f the DACs, when turned n via register S262, can be read r written via registers S272 (fr SA1) and S274 (fr SA2). COPYRIGHT One RF Technlgy 2004 Page: 7-4 File: Manual_B868-tiny_e_v3.1.dc Rev: 3.1/