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LRI64 Arkusz danych(PDF) 12 Page - STMicroelectronics

Numer części LRI64
Szczegółowy opis  Memory TAG IC at 13.56 MHz, with 64-bit Unique ID and WORM user area, ISO15693 and ISO18000-3 Mode 1 compliant
PDF  52 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LRI64 Arkusz danych(HTML) 12 Page - STMicroelectronics

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Data rate and data coding
LRI64
12/52
6
Data rate and data coding
The data coding method involves pulse position modulation. The LRI64 supports the “1-out-
of-4” pulse coding mode. Any request that the VCD might send in the “1-out-of-256” pulse
coded mode, is ignored, and the LRI64 remains in its current state.
Two bit values are encoded at a time, by the positioning of a pause of the carrier frequency
in one of four possible 18.88µs (256/fC) time slots, as shown in Figure 6.
Four successive pairs of bits form a byte. The transmission of one byte takes 302.08 µs and,
consequently, the data rate is 26.48 kbits/s (fC/512).
The encoding for the least significant pair of bits is transmitted first. For example Figure 5
shows the transmission of E1h (225d, 1110 0001b) by the VCD.
Figure 6.
“1-out-of-4” coding mode
AI06658
9.44 µs
9.44 µs
75.52 µs
28.32 µs
9.44 µs
75.52 µs
47.20µs
9.44 µs
75.52 µs
66.08 µs
9.44 µs
75.52 µs
Pulse position for "00"
Pulse position for "11"
Pulse position for "10" (0=LSB)
Pulse position for "01" (1=LSB)



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