LRI64 datasheet(8/38 Pages) STMICROELECTRONICS

部件名	LRI64

功能描述	Memory TAG IC, 64-bit Unique ID with WORM User Area 13.56MHz, ISO15693 and ISO18000-3 Mode 1 Compliant

PDF	38 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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8 / 38 page

LRI64

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DATA RATE AND DATA CODING

The data coding method involves pulse position

modulation. The LRI64 supports the “1-out-of-4”

pulse coding mode. Any request that the VCD

might send in the “1-out-of-256” pulse coded

mode, is ignored, and the LRI64 remains in its cur-

rent state.

Two bit values are encoded at a time, by the posi-

tioning of a pause of the carrier frequency in one

of four possible 18.88µs (256/fc) time slots, as

shown in Figure 7.

Four successive pairs of bits form a byte. The

transmission of one byte takes 302.08 µs and,

consequently, the data rate is 26.48 kbits/s (fc/

512).

The encoding for the least significant pair of bits is

transmitted first. For example Figure 6. shows the

transmission of E1h (225d, 1110 0001b) by the

VCD.

Figure 7. “1-out-of-4” Coding Mode

AI06658

9.44 µs

75.52 µs

28.32 µs

9.44 µs

75.52 µs

47.20µs

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)

LRI64 数据表(PDF) 8 Page - STMicroelectronics

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