lri2k STMicroelectronics, lri2k Datasheet - Page 15

• Manufacturer Part Number: 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
• Manufacturer: STMicroelectronics

LRI2K
3
3.1
Figure 5.
Pulse
Modulated
Carrier
Data rate and data coding
The data coding implemented in the LRI2K uses pulse position modulation. Both data
coding modes that are described in the ISO 15693 are supported by the LRI2K. The
selection is made by the VCD and indicated to the LRI2K within the start of frame (SOF).
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/f
byte. In this case the transmission of one byte takes 4.833 ms and the resulting data rate is
1.65 kbits/s (f
Figure 5
decimal) is sent by the VCD to the LRI2K.
The pause occurs during the second half of the position of the time period that determines
the value, as shown in
A pause during the first period transmits the data value 00h. A pause during the last period
transmits the data value FFh (255 decimal).
1 out of 256 coding mode
0 1
illustrates this pulse position modulation technique. In this Figure, data E1h (225
2
C
3
/8192).
. . . . . . . . .
. . . . . . . . .
. . . . . . . .
Figure
6.
2
2
5
. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . .
4.833 ms
18.88 µs
9.44 µs
C
), determines the value of the
Data rate and data coding
2
5
2
2
5
3
AI06656
2
5
4
2
5
5
15/89