ST25DV64KC datasheet(162/203 Pages) STMICROELECTRONICS

Teilenummer	ST25DV64KC

Bauteilbeschribung	Dynamic NFC/RFID tag IC with 4-Kbit, 16-Kbit or 64-Kbit EEPROM, fast transfer mode capability and optimized I2C

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Hersteller	STMICROELECTRONICS [STMicroelectronics]

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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

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 92.

Figure 92. Logic 0, high data rate, fast commands

18.88 µs

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 93.

Figure 93. Logic 1, high data rate, fast commands

18.88 µs

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 94.

Figure 94. Logic 0, low data rate, fast commands

75.52 µs

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 95.

ST25DV04KC ST25DV16KC ST25DV64KC

Bit representation and coding for fast commands

DS13519 - Rev 3

page 162/203

ST25DV64KC Datenblatt(PDF) 162 Page - STMicroelectronics