ST25TV02K datasheet(78/90 Pages) STMICROELECTRONICS

78 / 90 page

A.2

VICC to VCD frames

Frames are delimited by an SOF and an EOF. They are implemented using code violation. Unused options are

reserved for future use. For the low data rate, the same subcarrier frequency or frequencies is/are used. In this

case, the number of pulses is multiplied by 4. For the fast commands using one subcarrier, all pulse numbers and

times are divided by two.

A.3

SOF when using one subcarrier

A.3.1

High data rate

For the fast commands, the SOF comprises an unmodulated time of 28.32 µs, followed by 12 pulses at

423.75 kHz (fC / 32), and a logic 1 that consists of an unmodulated time of 9.44 µs followed by four pulses

at 423.75 kHz, as shown in Figure 36.

Figure 36. Start of frame, high data rate, one subcarrier, fast commands

56.64 µs

18.88 µs

A.3.2

Low data rate

For the fast commands, the SOF comprises an unmodulated time of 113.28 µs, followed by 48 pulses at 423.75

kHz (fC / 32), and a logic 1 that includes an unmodulated time of 37.76 µs followed by 16 pulses at 423.75 kHz, as

shown in Figure 37.

Figure 37. Start of frame, low data rate, one subcarrier, fast commands

226.56 µs

75.52 µs

ST25TV02K ST25TV512

VICC to VCD frames

DS12074 - Rev 11

page 78/90

ST25TV02K Datasheet(PDF) 78 Page - STMicroelectronics