LRI2K datasheet(17/89 Pages) STMICROELECTRONICS

Part #	LRI2K

Description	13.56 MHz, 2048-bit EEPROM tag IC with 64-bit UID and kill code, ISO 15693 and ISO 18000-3 Mode 1 compliant

PDF	89 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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17 / 89 page

LRI2K

Data rate and data coding

17/89

3.2

Data coding mode: 1 out of 4

The value of 2 bits is represented by the position of one pause. The position of the pause on

1 of 4 successive time periods of 18.88 µs (256/fC) determines the value of the 2 bits. Four

successive pairs of bits form a byte, where the least significant pair of bits is transmitted first.

In this case the transmission of one byte takes 302.08 µs and the resulting data rate is

26.48 kbit/s (fC/512). Figure 7 illustrates the 1 out of 4 pulse position technique and coding.

Figure 8 shows the transmission of E1h (225d - 1110 0001b) by the VCD.

Figure 7.

1 out of 4 coding mode

Figure 8.

1 out of 4 coding example

AI06658

9.44 µs

75.52 µs

28.32 µs

9.44 µs

75.52 µs

47.20 µs

9.44 µs

75.52 µs

66.08 µs

9.44 µs

75.52 µs

Pulse position for "00"

Pulse position for "11"

Pulse position for "10" (0=LSB)

Pulse position for "01" (1=LSB)

AI06659

75.52 µs

LRI2K Datasheet(PDF) 17 Page - STMicroelectronics