SRI512-A3S/1GE STMicroelectronics, SRI512-A3S/1GE Datasheet - Page 22

• Manufacturer Part Number: SRI512-A3S/1GE
• Description: IC MEMORY 13.56MHZ EEPRM ADH ANT
• Manufacturer: STMicroelectronics
• Series: SRI512r

Specifications of SRI512-A3S/1GE

• Rf Type: Read / Write
• Frequency: 13.56MHz
• Features: ISO14443-B
• Package / Case: 38mm x 38mm
• Operating Temperature (max): 85C
• Operating Temperature Classification: Commercial
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-5535-2

SRI512 states
6
6.1
6.2
6.3
6.4
6.5
6.6
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SRI512 states
The SRI512 can be switched into different states. Depending on the current state of the
SRI512, its logic will only answer to specific commands. These states are mainly used
during the anticollision sequence, to identify and to access the SRI512 in a very short time.
The SRI512 provides 6 different states, as described in the following paragraphs and in
Figure
Power-off state
The SRI512 is in Power-off state when the electromagnetic field around the tag is not strong
enough. In this state, the SRI512 does not respond to any command.
Ready state
When the electromagnetic field is strong enough, the SRI512 enters the Ready state. After
Power-up, the Chip_ID is initialized with a random value. The whole logic is reset and
remains in this state until an Initiate() command is issued. Any other command will be
ignored by the SRI512.
Inventory state
The SRI512 switches from the Ready to the Inventory state after an Initiate() command has
been issued. In Inventory state, the SRI512 will respond to any anticollision commands:
Initiate(), Pcall16() and Slot_marker(), and then remain in the Inventory state. It will switch to
the Selected state after a Select(Chip_ID) command is issued, if the Chip_ID in the
command matches its own. If not, it will remain in Inventory state.
Selected state
In Selected state, the SRI512 is active and responds to all Read_block(), Write_block(), and
Get_UID() commands. When an SRI512 has entered the Selected state, it no longer
responds to anticollision commands. So that the reader can access another tag, the SRI512
can be switched to the Deselected state by sending a Select(Chip_ID2) with a Chip_ID that
does not match its own, or it can be placed in Deactivated state by issuing a Completion()
command. Only one SRI512 can be in Selected state at a time.
Deselected state
Once the SRI512 is in Deselected state, only a Select(Chip_ID) command with a Chip_ID
matching its own can switch it back to Selected state. All other commands are ignored.
Deactivated state
When in this state, the SRI512 can only be turned off. All commands are ignored.
19.
Doc ID 13263 Rev 5
SRI512