LRI64 datasheet(11/52 Pages) STMICROELECTRONICS

部件名	LRI64

功能描述	Memory tag IC at 13.56 MHz, with 64-bit unique ID and WORM user area, ISO 15693 and ISO 18000-3 Mode 1 compliant

PDF	52 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

11 / 52 page

LRI64

Communication signal from VCD to LRI64

11/52

Communication signal from VCD to LRI64

Communications between the VCD and the LRI64 involves a type of amplitude modulation

called amplitude shift keying (ASK).

The LRI64 only supports the 10% modulation mode specified in ISO 15693 and ISO 18000-

3 Mode 1 standards. Any request that the VCD might send using the 100% modulation

mode, is ignored, and the LRI64 remains in its current state. However, the LRI64 is, in fact,

operational for any degree of modulation index from between 10% and 30%.

The modulation index is defined as (a-b)/(a+b) where a and b are the peak and minimum

signal amplitude, respectively, of the carrier frequency, as shown in Figure 4.

Figure 4.

10% modulation waveform

Figure 5.

“1-out-of-4” coding example

Table 2.

10% modulation parameters

Parameter

Min

Max

–

0.1 x (a-b)

–

0.1 x (a-b)

AI06655B

tRFF

tRFSFL

tRFR

AI06659B

75.52 µs

LRI64 数据表(PDF) 11 Page - STMicroelectronics