xra00 STMicroelectronics, xra00 Datasheet - Page 10

• Manufacturer Part Number: xra00
• Description: Uhf, Epcglobal Class 1b, Contactless Memory Chip 96 Bit Epc With Inventory And Kill Function
• Manufacturer: STMicroelectronics

XRA00
Table 3. Request Modulation Pulse Parameters for European Operation ( 20 to 55°C)
Note: The data shown in
Request Frame Format
Readers communicate with the XRA00 using two
types of modulation: Data modulation and Bin
modulation.
Data modulation is used to transmit data from the
Reader to the XRA00.
Bin modulation is used to synchronize XRA00 an-
swers and define time slot intervals while running
the XRA00 anti-collision algorithm after a PINGID
command.
All transactions begin with a transaction gap pulse,
t
to t
dow as described in
During the Data modulation, the Reader provides
a master clock signal to XRA00 devices located in
its neighborhood. The time between clock pulses,
t
The XRA00 devices are synchronized to the
Reader on the negative-going edge of the low lev-
el interval of the RF envelope. There is a propor-
tional relationship between this fundamental
frequency and all subsequent signaling.
10/40
trangap
0
F
t
t
1/t
t
t
t
t
t
t
t
t
t
Ripple
MOD
t
T
0
0Tol
fwhm0
fwhm1
fwhmBin
trangap
fwhmBinRW
transetup
tranhold
f
r
Coast
, determines the Reader-to-XRA00 data rate.
C
Reset
transetup
Symbol
0
, followed by a period of time at least equal
that precedes the Data modulation win-
UHF Carrier Frequency
Master Clock Time Period for a single bit sent to the XRA00
Master Clock Time Period Tolerance
Request Frame Data Rate (1/T
Pulse Modulation Width of Binary Data 0 at 50% Level
Pulse Modulation Width of Binary Data 1 at 50% Level
Pulse Modulation Width of Bin Pulse at 50% Level
Pulse Modulation Width of Transaction Gap at 50% Level
Bin Response Window at 50% Level
Delay between Transaction Gap and Data Modulation Windows
Delay before the next Transaction Gap
Pulse Modulation Fall Time (90% to 10% level)
Pulse Modulation Rise Time (10% to 90% level)
Ripple
Pulse Modulation Depth
Delay between Request EOF and the next Transaction Gap
RF Off time to Power down a XRA00
Table 3.
Figure 11.
is Preliminary Data. It is subject to change without previous notice.
Description
0
)
The encoding used for the binary data from the
Reader to the XRA00 is the pulse width modula-
tion of the low level pulse as shown in
Logical 0 is defined as a modulation whose width
is 1/8 of the master clock interval
Logical 1 is encoded as a modulation whose width
is 3/8 of the master clock interval
After the Data modulation windows in which the
Reader generates the XRA00 command, the
Reader generates Bin pulses to define the time
slots used by the XRA00 to answer. During the
first interval, after the Data modulation EOF, the
XRA00 sets up for answers. The XRA00 uses one
out of two Bin modulation schemes depending on
the Reader command.
For SCROLL commands, the Reader generates 1
Bin pulse used for synchronization, followed by the
XRA00 answer.
For PING commands, the Reader generates 8 BIN
pulses to define 8 BIN response windows. These
8 BIN response windows are used to delineate
XRA00 answers during a PINGID command.
A BIN interval is defined by a BIN pulse with a
width of t
sponse window delay of t
fwhmBin
= 3/8t
0
, followed by a BIN re-
2.5*T
fwhmBinRW
4*T
Min
860
200
40
15
64
40
-1
10/8 * T
1/8 * T
3/8 * T
3/8 * T
0
0
(Figure
66,67
2000
0
0
0
8*T
Max
(Figure
870
300
300
0
+1
= 8T
25
10
60
20
0
Figure 12.
0
7.), t
.
Units
6.), t
Kbps
MHz
ms
µs
µs
µs
µs
µs
µs
µs
µs
ns
ns
µs
%
%
%
0
.
0
.