应用笔记 MF RC500 匹配电路和天线的设计

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1 MF RC MIFARE MF RC500

2 MF RC MIFARE RWD CARD Card RWD MF RC EMC Ω EMC Ω full range solution Ω Ω EMC Ω MIFARE MF RC500

3 Ω checking references A MIFARE MF RC500

4 MF RC MF RC500 MIFARE IC MIFARE ISO 14443A MIFARE RF RF MF RC MHz MF RC530 ISO MF RC500 Parrallel ucontroller Interface Crypto 1 Security & Key Memory Status & Control Data Processing Analog Circurity Intergrated Demodulator Bit-Decoder Output Drivers MF RC MF RC500 u-controller 8 CRC/ MF RC500 ISO Crypto1 MIFARE Crypto1 key-sets 100mm 2.2 MIFARE RC500 MIFARE reader 2-2 reader IC MIFARE MF RC500

5 MIFARE MIFARE ISO Type A 1 MIFARE MIFARE transformer principlemifare 1 overview MIFARE RF Interface Energy transmission Transformer priciple; MIFARE card passive Operating frequency 13.56MHz Communication structure Half duplex, reader talks first Data rate khz Data transmission Both directions RWD Card 100% ASK, Miller Coded Card RWD subcarrier load modulation, subcarrier frequence 847.5kHz, Manchester Coded MIFARE MIFARE MIFARE MF RC500

6 RWD I MIFARE A RWD CARD MIFARE talk 100% ASK pulse pause ISO Type A Data Transmission RWD to CARD typical signal shape Q 2-5 Q MIFARE MIFARE Miller Code 2-6 Miller Code MIFARE MF RC500

7 2-4 Data Transmission RWD to CARD Miller Coding MIFARE 105.9KHz1 9.44µs 1 3µs µs Card RWD Subcarrier Load Modulation Principle RWD load modulation 2-7 RWD load or resistance MIFARE MF RC500

8 2-7 Subcarrier Load Modulation Principle MIFARE 13.56MHz f R RWD 60dB MIFARE sub-carrier f SUB direct load modulation 13.56MHz f SUB side-bands MIFARE Manchester 2-8 MIFARE card 105.9kHz 9.44µs 1 0 MIFARE f SUB f R / khz To To 1/f R 74ns MIFARE MF RC500

2-8 Principle Data Coding card to RWD time domain 2 14.41MHz 12.

9 2-8 Principle Data Coding card to RWD time domain MHz 12.74MHz Data Coding card to RWD Frquency domain MIFARE MF RC500

10 3 MF RC MF RC mm RF straightforward Ω 10m MIFARE MF RC500

11 3-1 Design Help 2 50Ω 50Ω 100mm 50mm MIFARE MF RC500

12 2 Comparison of antenna concepts Concept 50Ω mateched Directly matched Full range Short range MF RC500 EMC-Circuit Same circuitry and values Antenna Reader Receiving Same circuit and values circuit Impedance Using TX1 and Using only TX1 Transformation TX2 Cable 50Ω coaxial Short wire or directly connected Antenna Same circuit, but different values Same circuit, but different matching depending on the antenna size values depending on the circuitry antenna size Antenna coil Operating distance depends on the Oprating distance depends on antenna size and environmental the antenna size and influence environmental influences Antenna Shielding depends on the application, e.g. the housing and shielding environmental influences 3.2 MIFARE A MIFARE 2 3 MIFARE 1 coupling coefficient k MIFARE A k rule of thumb MIFARE MF RC500

13 k MIN / 20cm R 10cm 3-2 Antenna Radius versus oprating distance mm EMC MIFARE EMC MIFARE 13.56MHz 13.56MHz multi-layer layout 3-3 L 0 C MF RC500 both side-bands V MID R X V MID R X V MID MIFARE MF RC500

14 3-3 R 1 R 2 C 3 C complete direct matched antenna configuration 3 value of the EMI Filter and Receiving Circuit Components Value Remark L ΩµH 10% Magmetic shielded e.g. TDK ACL3225S-T C 0 47pF 2% NP0 material R 1 R 2 820Ω 5% 2.7kΩ 5% C 3 15pF 2% NP0 material C 4 100nF 2% NP0 material MF RC MIFARE MF RC500

15 L a L b R a R b C a C b L a L b 3-4 Tx11 Tx12 L ant R ant C ant 3-4 Equivalent circuit of an antenna coil for a directly matched antenna Q C ant A MIFARE 13.56MHz A R ant L ant R ant L ant R ant Q ω R L ant / R ant ω R 2π f R Q MIFARE 105.9kHz/sec RWD MIFARE MF RC500

16 T 3µs B B f R / Q - B T 1 Q Q f R T 13.56MHz 3µs Q 35 Q R EXT 3-5 R EXT R EXT ω R L ant / Q R ant ω R L ant / 35 R ant centre tap External resistance to reduce the antenna s quality factor C s C p MIFARE MF RC500

17 3-6 complete matching circuit 4 Starting Values for the antenna matching circuit L ant [ µh] C s [ pf] C p1 [ pf] C p2 [ pf] pF C s C p NP0 2% PCB distance between the turns shield layer C p MIFARE MF RC500

18 3.4 50Ω Ω EMC long-and the short-range impedance transformation 50Ω EMC MIFARE 13.56MHz 13.56MHz multi-layer layout 3-7 L 0 C MF RC500 both side-bands V MID R X V MID R X V MID 3-7 R 1 R 2 C 3 C value of the EMI Filter and Receiving Circuit Components Value Remark L 0 1.0µH 10% Magmetic shielded e.g. TDK ACL3225S-T C 0 47pF 2% NP0 material R 1 R 2 820Ω 5% 2.7kΩ 5% C 3 15pF 2% NP0 material C 4 100nF 2% NP0 material Ω full range solution 50Ω MF RC500 EMC MF RC500 50Ω MF RC500 T X1 T X2 ground unsymmetrical potential 3-7 L 0 C 0 EMC L 0 C 0 C 1 T-Filter 50Ω B1 1:1 50Ω C2b that tuning capacitance to the maximum output voltage at the antenna MF RC500 T X1 T X MIFARE MF RC500

19 30Ω smith 3-7 Full Range Solution 50Ω impedance transformation 50Ω EMC 50Ω 6 6 Type50-1 Value for the impedance transformation Components Value Remark C 1 82pF 2% NP0 material C 2a 69pF 2% NP0 material C 2b 0~30pF B 1 1:1 Transformer e.g. Coilcraft 1812WBT Ω 50Ω 1 stage T X1 T X2 3-8 L 0 C 0 EMC L 0 C 0 C 1 T-Filter 50Ω MIFARE MF RC500

20 C 1b C 1 EMC 50Ω 7 7 Values for the impedance transformation Components Value Remark C 1a 69pF 2% NP0 material C 1b 0~30pF NP0 material Ω 50Ω A 50Ω 13.56MHz L ANT R ANT C ANT 3-9 Equivalent circuit of an antenna coil Q C ant A MIFARE 13.56MHz A R ant MIFARE MF RC500

21 L ant R ant L ant R ant Q ω R L ant / R ant ω R 2π f R Q MIFARE 105.9kHz/sec RWD T 3µs B B f R / Q - B T 1 Q Q f R T 13.56MHz 3µs Q 35 Q R EXT 3-10 R EXT 3-10 External resistance R EXT R EXT ω R L ant / Q R ant ω R L ant / 35 R ant Ω 50Ω MIFARE MF RC500

22 3-11 C s C p C s C p SMD with NP0 dielectrcum for C p C p 10~20pF CM 3 R/W MIFARE MF RC500

23 3cm for reduced R/W distance and for close metal ferrite shielding is a must 4.2 MIFARE MIFARE R/W R/W (SMD NPO ) 5 PCB ferrite shielding will not increase oprating distance above values avaliable in non-metalic environment PCB 4 EMC MIFARE MF RC500

24 PCB 4 EMC PCB PCB MIFARE MF RC500

25 13.56MHz ma PCB X : H diso Hmin=1.5A/m MIFARE MF RC500

26 ( R =40) ISO14443 Hmin MIFARE MF RC500

27 MIFARE MF RC500

28 MF RC500 PCB EMC L 0 C 0 MF RC500 MF RC500 T X1 T X2 EMC C 0 MF RC500 TGND ground plane with multiple vias for connection 6-1 MF RC EMC =115*115mm Lant t.b.d. Cant.b.d. Rant t.b.d. Cs t.b.d. Cp t.b.d. Rext t.b.d MIFARE MF RC500

29 MIFARE MF RC500

6.3.2 78.5X67mm Lant t.b.d. Cant.b.d. Rant t.b.d. Cs t.b.d. Cp t.

30 X67mm Lant t.b.d. Cant.b.d. Rant t.b.d. Cs t.b.d. Cp t.b.d. Rext t.b.d MIFARE MF RC500

31 =115*75mm Lant=330nH Cant=20.2pF Rant=0.25 Cs=47pF 3.3pF Cp=270pF 68pF Rext= MIFARE MF RC500

32 6.4.2 =15cm Lant=545nH Cant=25.4pF Rant=0.32 Cs=33 4.7pF Cp= pF Rext= MIFARE MF RC500

33 6.4.3 =15cm;3 PCB Lant=460nH Cant=38.7pF Rant=0.53 Cs=39 3.3pF Cp=180 15pF Rext= MIFARE MF RC500

34 MIFARE MF RC500

35 7 PCB MIFARE MF RC500

36 ( HP4195) MHz Cs Cp MIFARE MF RC500

37 13.56MHz Cp Lant Rant Lant Rant % Cs Cp Cs Cp 20% MIFARE MF RC500

38 % 50 BNC Cy-probe Cx-probe Lissajous Lissagous 50 Wave form Sinusoidal Frequency 13.56MHz Amplitude 2V-5V MIFARE MF RC500

x-probe Cxprobe y-probe Cyprobe Lissajous Ccal 50 50 BNC Lissajous Ccal Cy-probe Y-probe x-probe x-probe y-probex-scale

39 x-probe Cxprobe y-probe Cyprobe Lissajous Ccal BNC Lissajous Ccal Cy-probe Y-probe x-probe x-probe y-probex-scale 2V/DIV y-scale 1V/DIV Lissajous 45 Step 2 C s C p Lissajous Lassajous Lissajous Lissajous 50Ω Ω MIFARE MF RC500

40 Lissajous figure figure X Y 45 Z 50Ω 45 Z 50Ω 7-7 f LOW Z 50Ω φ 0 Z 50Ω 7-7 Cs Cp 40% MIFARE MF RC500

41 7.2 checking Ω check 50MHz MIFARE MF RC500

7-9 CH1 CH2 MIFARE NPAUSE0 CH2 7-10 8 t 2 special interest 90% 5% R

42 7-9 CH1 CH2 MIFARE NPAUSE0 CH t 2 special interest 90% 5% R EXT 5% t 2 1.4µs 1.4µs Q 35 R EXT t 2 0.7µs Q R EXT MIFARE MF RC500

43 7-10 ISO ISO Pulse length t1 [µs] t2 [µs] t3 [µs] t4 [µs] T1 MAX T1 MIN references [1] Data Sheet MIFARE MF RC500 Highly Intergrated ISO 14443A Reader IC [2] ISO Identification cards-contactless integrated circuit cards-proximity cars,part A 9.1 ASK EMC ISO MIFARE Classic MIFARE Pro RWD Amplitude shift keying Proximity Card MIFARE MIFARE / MIFARE MIFARE MF RC500

44 9.2 shape l 1 D 1 K N 1 ln length of the conductor loop of one turn Diameter of the wire or width of the PCB conductor respectively =1.07 =1.47 Natural logarithm function PCB N 9-1 5cm MIFARE MF RC500

45 MIFARE 13.56MHz R DC The skin effect The relevant depth copper material to 18 R ANT R ANT 5 R DC R ANT MIFARE MF RC500

Cube20S small, speedy, safe Eextremely modular Up to 64 modules per bus node Quick reaction time: up to 20 µs Cube20S A new Member of the Cube Family

Cube20S small, speedy, safe Eextremely modular Up to 64 modules per bus node Quick reaction time: up to 20 µs Cube20S A new Member of the Cube Family small, speedy, safe Eextremely modular Up to 64 modules per bus de Quick reaction time: up to 20 µs A new Member of the Cube Family Murrelektronik s modular I/O system expands the field-tested Cube family