LRI64 datasheet(10/38 Pages) STMICROELECTRONICS

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LRI64

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COMMUNICATIONS SIGNAL FROM LRI64 TO VCD

ISO 15693 and ISO 18000-3 Mode 1 standards

define several modes, for some parameters, to ca-

ter for use in different application requirements

and noise environments. The LRI64 does not sup-

port all of these modes, but supports the single

subcarrier mode at the fast data rate.

Load Modulation

The LRI64 is capable of communication to the

VCD via the inductive coupling between the two

antennas. The carrier is loaded, with a subcarrier

with frequency fS, generated by switching a load in

the LRI64.

The amplitude of the variation to the signal, as re-

ceived on the VCD antenna, is at least 10mV,

when measured as described in the test methods

defined in International Standard ISO10373-7.

Subcarrier

The LRI64 supports the one subcarrier modulation

response format. This format is selected by the

VCD using the first bit in the protocol header.

The frequency, fS, of the subcarrier load modula-

tion is 423.75kHz (=fC/32).

Data Rate

The LRI64 response uses the high data rate for-

mat (26.48 kbits/s). The selection of the data rate

is made by the VCD using the second bit in the

protocol header.

Bit Representation and Coding using One

Subcarrier, at the High Data Rate

Data bits are encoded using Manchester coding,

as described in Figure 10. and Figure 11.

Logic 0. A logic 0 starts with 8 pulses of

423.75kHz (fC/32) followed by an unmodulated

period of 18.88µs as shown in Figure 10.

Figure 10. Logic 0, High Data Rate

Logic 1. A logic 1 starts with an unmodulated

period of 18.88µs followed by 8 pulses of

423.75kHz (fC/32) as shown in Figure 11.

Figure 11. Logic 1, High Data Rate

AI06663

37.76 µs

AI06664

37.76 µs

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