ATA555812C-DDB Atmel, ATA555812C-DDB Datasheet - Page 18

• Manufacturer Part Number: ATA555812C-DDB
• Description: IC IDIC 1KBIT R/W DIE
• Manufacturer: Atmel

Specifications of ATA555812C-DDB

• Function: Read/Write
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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ATA5558
It is possible to carry out commands simultaneously on more than one tag. To do this they must
all first be selected by specifying a group of tags within the READY state and putting the group
into the Selected state. This is performed by using a SelectGroup command with a matching
partial Tag ID pattern. A group of tags in the Selected state may be written simultaneously with
identical blocks of data. Data verification and checksum errors are reported by the tags using a
special dual pattern code. Tags within the Selected state will automatically drop into the Quiet
state and be excluded from subsequent anticollision detection, if a subsequent Select or GetID
command is received.
Selection can also take place on tag groups with non-matching Tag ID patterns using the Select-
NGroup command. This could be useful for example, to check a storage crate for items which do
not match a certain selection criteria (e.g. color or dispatch destination), so a SelectNGroup
command with the Tag ID mask set to the color black will GroupSelect all non-black items. If no
tag responds with a SOF pattern, then there are no black items present.
Figure 5-1.
POWER DOWN
Tag State Diagram
ResetToReady
(ITFMode )
Power On
(PM or EAS only)
QUIET
Power On
Implicit state change
Command initated state transition
command (PM or EAS only)
with matching TagID
ResetToReady or invalid
Select, GroupSelect
or GetID opcode
GroupSelect
or SelectAll
(ITF mode )
All sucessfull select
Select or
READY
commands
ResetToReady,
Reset Selected
(continuous data
PM READY
GetID
transmission)
Start Gap
SELECTED
Read/Write/Login
TagID eliminated
detection loop
Arbitration lost/
Anticollision
4681E–RFID–11/09
Identified
TagID