ATA555811-DDW Atmel, ATA555811-DDW Datasheet - Page 9

• Manufacturer Part Number: ATA555811-DDW
• Manufacturer: Atmel

Specifications of ATA555811-DDW

• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Operating Temperature Classification: Industrial
• Lead Free Status / RoHS Status: Not Compliant

2.8
Figure 2-7.
3. Transmission Protocol
4681C–RFID–09/05
Downlink Data Rate
Notes:
(1) If master key = 6hex then all test modes are ignored and password protection enabled
(2) If DDR = 1 and master key = 6hex or 9hex then data rate = fast, otherwise slow
R = reserved for future use, should be set to 0
x = don't care state
Tag Configuration Register
Master Key
0 = Unlocked
1 = Locked
Lock Bit
(DDR)
Configuration Register
(2)
(1)
L
31 30 29 28
0
MSB...
The internal tag configuration register holds a shadow copy of the configuration settings stored
in the system memory’s block 63. It is refreshed after every POR cycle (RF field on), Reset to
Ready or Write to block 63.
The transmission protocol defines the mechanism to exchange commands and data between
the interrogator and the tags. In all but the Public and EAS Mode, the interrogator has complete
control over the communication flow – all data transmission being synchronized to interrogator
commands and the interrogator field clock – “Interrogator Talks First” (ITF) principle. This means
that a tag does not transmit data, unless it has received and properly decoded an interrogator
command.
The protocol is based on an exchange of
1 1
• commands from the interrogator to the tag (Downlink mode)
• and response from the tag to the interrogator (Uplink mode)
Operating
x
0 1
1 1
Mode
0
0
27 26 25 24
R R
= ITF
= PM
= EAS
0 0 0
0 0 1
.
.
1 1 1
( bit periods )
23 22 21 20
Preamble
.
.
Length
p2
SOF
.
.
p1 p0
= 1
= 2
= 8
.
.
19 18 17 16
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
Length
TagID
n4 n3 n2 n1 n0
= 16 bit
= 32 bit
= 48 bit
= 64 bit
= 80 bit
= 96 bit
= 40 bit
= 56 bit
Data Bit Rate
RF/2(n+1)
15 14 13 12
Uplink
ATA5558 [Preliminary]
11 10 9 8
0
ITF =Interrogator Talks First Mode
PM = Public Mode
EAS = Electrical Article Surveillance
NRZ = Non Return to Zero
R
Encoding
0 0
0 1
1 0
1 1
Uplink
1 = Downlink CRC check
0 = Reserved
7 6 5 4
= Manchester
= NRZ (Direct Coding)
= FDX-B (Biphase)
= Reserved
mandatory
0 0
a4 a3
Max. Block
3 2 1 0
a2 a1 a0
...LSB
9