LRI2K datasheet(24/89 Pages) STMICROELECTRONICS

24 / 89 page

LRI2K to VCD frames

LRI2K

24/89

6.1.2

Low data rate

SOF comprises an unmodulated time of 226.56 µs, followed by 96 pulses at 423.75 kHz

(fC/32), and a logic 1 that consists of an unmodulated time of 75.52 µs followed by 32 pulses

at 423.75 kHz as shown in Figure 26.

Figure 26.

Start of frame, Low data rate, one subcarrier

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 27.

Figure 27.

Start of frame, Low data rate, one subcarrier x2

6.2

SOF when using two subcarriers

6.2.1

High data rate

The SOF comprises 27 pulses at 484.28 kHz (fC/28), followed by 24 pulses at 423.75 kHz

(fC/32), and a logic 1 that includes 9 pulses at 484.28 kHz followed by 8 pulses at 423.75

kHz as shown in Figure 28.

For the Fast commands, the x2 mode is not available.

Figure 28.

Start of frame, High data rate, two subcarriers

6.2.2

Low data rate

The SOF comprises 108 pulses at 484.28 kHz (fC/28) followed by 96 pulses at 423.75 kHz

(fC/32), and a logic 1 that includes 36 pulses at 484.28 kHz followed by 32 pulses at

423.75 kHz as shown in Figure 29.

For the Fast commands, the x2 mode is not available.

Figure 29.

Start of frame, Low data rate, two subcarriers

453.12µs

ai12080

151.04µs

226.56µs

ai12081

75.52µs

112.39µs

ai12082

37.46µs

449.56µs

ai12083

149.84µs

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