XRA00SBN18I1GE STMicroelectronics, XRA00SBN18I1GE Datasheet - Page 28

• Manufacturer Part Number: XRA00SBN18I1GE
• Manufacturer: STMicroelectronics

Specifications of XRA00SBN18I1GE

• Lead Free Status / RoHS Status: Compliant

XRA00
PingID
The PingID command is a Basic command that
gives rise to a response from the XRA00.
When the command is sent, the XRA00 will re-
spond if the data sent by the Reader in the [VAL-
UE] field matches the data in the XRA00's internal
memory starting at the location specified by the
[PTR] field. Data in the [VALUE] field is compared
to the XRA00 memory, from the lowest to the high-
est memory address. XRA00 devices whose data
matches all of the bits in the [VALUE] field will re-
ply to the Reader. XRA00 devices whose data
does not match or that fail a parity test on any of
the parity bits will not modulate.
The PingID command is used as part of a multi-
XRA00 anti-collision algorithm described in detail
hereafter.
XRA00 devices that match the data sent by the
Reader respond with 8 address bits, from a point
designated by two parameters supplied by the
Reader, in increasing address order.
Table 10. Example of PingID Operation
Figure 30. PingID Answer Frame Structure for XRA00 3
PingID Answer Frame
The PingID command is used in the anti-collision
28/40
XRA00 1 ID
XRA00 2 ID
XRA00 3 ID
XRA00 4 ID
Bit Number
Lowest XRA00
address
Towards Highest
...
...1001111000010
...
...
Address Bit
...321098765432109876543210
XRA00 ID Code/Bit Position
01000100
11110101
10110000
(101)
Bin 5
0001011011101010
0001011011110110
0001011011110111
10101111 (pattern reflects order of transmission)
Lowest Address Bit
0
1010010010
Tag Data (8 bits)
b
b
b
b
Each XRA00 response is placed in one of 8 Bin
Response Windows delineated by BIN pulses sent
by the Reader.
Example of a PingID Command. A Reader is-
sues a PingID command containing the following
data:
[CMD] =
[PTR] =
[LEN] =
[VALUE] = 000101101
The XRA00 devices will attempt to check 9 bits of
their address data, starting at bit 7 against the data
specified in the [VALUE] field.
In the example shown in
bits in the XRA00 ID code are compared with the
[VALUE] data sent by the Reader. Bits shown in
Italic are modulated and returned to the Reader
during one of the Bin Response Windows. The
lowest 3 bits of the response determine the re-
sponse bin number.
algorithm. This command requires that the XRA00
devices that match the data sent by the Reader re-
ply with 8 modulated data bits in one of 8 Bin Re-
(bit 10 does not match)
XRA00 responds to
PingID command
YES
YES
YES
NO
-
00001000
00000111
00001001
Highest XRA00
Bin 6
(110)
b
b
b
b
address
Bin 4 (100
Bin 5 (101
Bin 0 (000
Table
response
Bin for
(PingID)
(0x07)
(0x09)
(0x2D)
-
-
10., the underlined
b
b
b
)
)
)
MSB
01000100
11110101
10110000
response
8-Bit
-
-
ai10769
LSB
b
b
b