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U227B Arkusz danych(PDF) 11 Page - ATMEL Corporation |
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U227B Arkusz danych(HTML) 11 Page - ATMEL Corporation |
11 / 18 page 11 4684E–RFID–02/08 U2270B The application of the U2270B includes the two capacitors C IN and CHP whose values are lin- early dependent on the transponder’s data rate. The following table gives the appropriate values for the most common data rates. The values are valid for Manchester and bi-phase code. The following applications are typical examples. The values of C IN and CHP correspond to the transponder’s data rate only. The arrangement to fit the magnetic-coupling situation is also inde- pendent of other design issues except for one constellation. This constellation, consisting of diode feedback plus fine frequency tuning together with the two-rail power supply, should be used if the transmission distance is d ≈ 10 cm. 4.1 Application 1 Application using few external components. This application is for intense magnetic coupling only. Figure 4-1. Application Circuit 1 Table 4-2. Recommended Capacitor Values Data Rate f = 125 kHz Input Capacitor (CIN) Decoupling Capacitor (CHP) f / 32 = 3.9 Kbits/s 680 pF 100 nF f / 64 = 1.95 Kbits/s 1.2 nF 220 nF + 1.5 nF 1.2 nF 47 nF 47 µF RF MS OE STANDBY HIPASS OUTPUT CFE INPUT COIL1 COIL2 1.35 mH R GND 5V Micro- controller DGND 1N4148 470 k Ω 110 k Ω DV S V Batt V DD V EXT V SS C HP C IN V S U2270B |
Podobny numer części - U227B |
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Podobny opis - U227B |
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