ST25DV64K datasheet(193/220 Pages) STMICROELECTRONICS

Il numero della parte	ST25DV64K

Spiegazioni elettronici	Dynamic NFC/RFID tag IC with 4-Kbit, 16-Kbit or 64-Kbit EEPROM,and fast transfer mode capability

PDF	220 Pages

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

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ST25DV04K ST25DV16K ST25DV64K

Bit representation and coding for fast commands

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Appendix A

Bit representation and coding

for fast commands

Data bits are encoded using Manchester coding, according to the following schemes. For

the low data rate, same subcarrier frequency or frequencies is/are used. In this case, the

number of pulses is multiplied by 4 and all times increase by this factor. For the Fast

commands using one subcarrier, all pulse numbers and times are divided by 2.

A.1

Bit coding using one subcarrier

A.1.1

High data rate

For the fast commands, a logic 0 starts with four pulses at 423.75 kHz (fC/32) followed by an

unmodulated time of 9.44 µs, as shown in Figure 84.

Figure 84. Logic 0, high data rate, fast commands

For the Fast commands, a logic 1 starts with an unmodulated time of 9.44 µs followed by

four pulses of 423.75 kHz (fC/32), as shown in Figure 85.

Figure 85. Logic 1, high data rate, fast commands

A.1.2

Low data rate

For the Fast commands, a logic 0 starts with 16 pulses at 423.75 kHz (fC/32) followed by an

unmodulated time of 37.76 µs, as shown in Figure 86.

Figure 86. Logic 0, low data rate, fast commands

For the Fast commands, a logic 1 starts with an unmodulated time of 37.76 µs followed by

16 pulses at 423.75 kHz (fC/32), as shown in Figure 87.

ST25DV64K Scheda tecnica(PDF) 193 Page - STMicroelectronics