LRIS2K datasheet(27/102 Pages) STMICROELECTRONICS

部件名	LRIS2K

功能描述	2048-bit EEPROM tag IC at 13.56 MHz, with 64-bit UID and Password, ISO15693 and ISO18000-3 Mode 1 compliant

PDF	102 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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27 / 102 page

LRIS2K

Bit representation and coding

27/102

Bit representation and coding

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 will increase by this factor. For the Fast

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

7.1

Bit coding using one subcarrier

7.1.1

High data rate

A logic 0 starts with 8 pulses at 423.75 kHz (fC/32) followed by an unmodulated time of

18.88 µs as shown in Figure 12.

Figure 12.

Logic 0, high data rate

For the fast commands, a logic 0 starts with 4 pulses at 423.75 kHz (fC/32) followed by an

unmodulated time of 9.44 µs as shown in Figure 13.

Figure 13.

Logic 0, high data rate x2

A logic 1 starts with an unmodulated time of 18.88 µs followed by 8 pulses at 423.75 kHz

(fC/32) as shown in Figure 14.

Figure 14.

Logic 1, high data rate

For the Fast commands, a logic 1 starts with an unmodulated time of 9.44 µs followed by 4

pulses of 423.75 kHz (fC/32) as shown in Figure 15.

Figure 15.

Logic 1, high data rate x2

37.76µs

ai12076

18.88µs

ai12066

37.76µs

ai12077

18.88µs

ai12067

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