M24LR64-R_1004 datasheet(41/126 Pages) STMICROELECTRONICS

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M24LR64-R

Data rate and data coding

Doc ID 15170 Rev 9

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Data rate and data coding

The data coding implemented in the M24LR64-R uses pulse position modulation. Both data

coding modes that are described in the ISO15693 are supported by the M24LR64-R. The

selection is made by the VCD and indicated to the M24LR64-R within the start of frame

(SOF).

9.1

Data coding mode: 1 out of 256

The value of one single byte is represented by the position of one pause. The position of the

pause on 1 of 256 successive time periods of 18.88 µs (256/fC), determines the value of the

byte. In this case the transmission of one byte takes 4.833 ms and the resulting data rate is

1.65 Kbits/s (fC/8192).

Figure 16 illustrates this pulse position modulation technique. In this figure, data E1h (225

decimal) is sent by the VCD to the M24LR64-R.

The pause occurs during the second half of the position of the time period that determines

the value, as shown in Figure 17.

A pause during the first period transmits the data value 00h. A pause during the last period

transmit the data value FFh (255 decimal).

Figure 16.

1 out of 256 coding mode

AI06656

0 1

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4.833 ms

18.88 µs

9.44 µs

Pulse

Modulated

Carrier

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