m24lr64-r STMicroelectronics, m24lr64-r Datasheet - Page 41

• Manufacturer Part Number: m24lr64-r
• Description: 64 Kbit Eeprom With Password Protection & Dual Interface 400 Khz I?c Serial Bus & Iso 15693 Rf Protocol At 13.56 Mhz
• Manufacturer: STMicroelectronics

M24LR64-R
9
9.1
Figure 16. 1 out of 256 coding mode
Pulse
Modulated
Carrier
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).
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 16
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
A pause during the first period transmits the data value 00h. A pause during the last period
transmit the data value FFh (255 decimal).
0 1
illustrates this pulse position modulation technique. In this figure, data E1h (225
2
3
C
. . . . . . . . .
. . . . . . . . .
/8192).
. . . . . . . .
Figure
17.
Doc ID 15170 Rev 9
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
41/126