m24lr64-r STMicroelectronics, m24lr64-r Datasheet - Page 46

• 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

Communications signal from M24LR64-R to VCD
10
10.1
10.2
10.3
46/126
Communications signal from M24LR64-R to VCD
The M24LR64-R has several modes defined for some parameters, owing to which it can
operate in different noise environments and meet different application requirements.
Load modulation
The M24LR64-R is capable of communication to the VCD via an inductive coupling area
whereby the carrier is loaded to generate a subcarrier with frequency f
generated by switching a load in the M24LR64-R.
The load-modulated amplitude received on the VCD antenna must be of at least 10mV
when measured as described in the test methods defined in International Standard
ISO10373-7.
Subcarrier
The M24LR64-R supports the one-subcarrier and two-subcarrier response formats. These
formats are selected by the VCD using the first bit in the protocol header. When one
subcarrier is used, the frequency f
When two subcarriers are used, the frequency f
is 484.28 kHz (f
continuous phase relationship between f
Data rates
The M24LR64-R can respond using the low or the high data rate format. The selection of
the data rate is made by the VCD using the second bit in the protocol header. It also
supports the x2 mode available on all the Fast commands.
rates produced by the M24LR64-R using the different response format combinations.
Table 17.
High
Low
Standard commands
Fast commands
Standard commands
Fast commands
Data rate
Response data rates
C
/28). When using the two-subcarrier mode, the M24LR64-R generates a
Doc ID 15170 Rev 9
S1
13.24 Kbit/s (f
of the subcarrier load modulation is 423.75 kHz (f
6.62 Kbit/s (f
26.48 Kbit/s (f
52.97 Kbit/s (f
One subcarrier
S1
and f
S1
S2
c
c
/2048)
c
c
/1024)
/512)
/256)
is 423.75 kHz (f
.
Table 17
C
6.67 Kbit/s (f
26.69 Kbit/s (f
shows the different data
/32), and frequency f
Two subcarriers
not applicable
not applicable
S
. The subcarrier is
c
M24LR64-R
/2032)
c
/508)
C
/32).
S2