Rainbow-electronics MAX66020 Manual do Utilizador descarregar pdf (Página 8)

MAX66020

ISO/IEC 14443 Type B-Compliant

1Kb Memory Fob

8 _______________________________________________________________________________________

DATA TO BE TRANSMITTED

INDICATES 180° PHASE CHANGE (POLARITY REVERSAL)

110

847kHz SUBCARRIER

BPSK MODULATION

TRANSMISSION OF A SINGLE BIT

POWER-UP DEFAULT = EIGHT CYCLES OF 847kHz (9.44μs)

CAN BE REDUCED TO FOUR, TWO, OR ONE SUBCARRIER CYCLES FOR COMMUNICATION IN THE ACTIVE STATE.

Figure 9. Uplink: BPSK Modulation of the 847.5kHz Subcarrier

CARRIER AMPLITUDE

11 1100

MODULATION INDEX M = = 0.08 TO 0.14

A - B

A + B

Figure 8. Downlink: 8% to 14% Amplitude Modulation

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 24 25

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Rainbow-electronics MAX66020 Manual do Utilizador Página 8