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ATA555811M01-DDW Datasheet(PDF) 10 Page - ATMEL Corporation |
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ATA555811M01-DDW Datasheet(HTML) 10 Page - ATMEL Corporation |
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10 / 42 page  10 4681C–RFID–09/05 ATA5558 [Preliminary] 3.1 Tag to Interrogator Communication All transmissions from the tag to the interrogator utilize amplitude modulation (ASK) of the RF carrier. This takes place by controlled switching of a resistive load between the coil pads which in turn modulates the RF field generated by the interrogator. The tag is capable of communicating with the interrogator via inductive coupling. Typical exam- ples of the incorporated amplitude modulation is shown in Figure 3-1: • Manchester encoded data signal • Bi-phase encoded data signal • NRZ direct data encoding • Dual pattern data coding is used during the anticollision loop and for an error code response Figure 3-1. Tag to Interrogator - Load Modulation Coding 3.1.1 Start of Frame (SOF) Encoding After the reception of a valid interrogator command the tag will reply immediately with a Start of Frame (SOF) pattern. The SOF pattern is made up of a variable length preamble and a fixed 2-bit (Manchester) code violation followed by a half bit duration of unmodulated carrier. The pre- amble length as set in the configuration block defines the number of (Manchester coded) zero initialization data bits. If the preamble length in the configuration register is set to zero, a single start bit will precede on the code violation. NRZ Data Anticollision dual pattern data coding load on load off T d load on load off T d T d T d Normal Manchester data coding load on load off T d load on load off T d Normal Biphase data coding load on T d or load off load on load off load on load off T d or Data "1" Data "0" |
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