AT24RF08C View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
'AT24RF08C' PDF : 21 Pages View PDF
Quiet
Similar to “infinite” except that only the global commands
are honored. If the operation of the system includes only
multi tag ID transmission along with the use of the global
set tamper command, it is useful to note that the global set
tamper command should be sent to every device before the
Disable Chip/Set Quiet command is sent to the selected
tag. Since tags in the init state transition to unselected
with a global command, the Disable Chip/Set Quiet will
automatically bring them back to init to complete the multi-
tag discrimination procedure. In some cases, it is possible
for multiple tags to be selected inadvertently, or for tags to
be in a state that the reader does not expect. Normally, a
Global Reset Quiet command may be issued to reset all
tags, but this will be ignored by a device while it is
transmitting its ID. Issuing this command three times in
succession will ensure that any rogue chips go back to the
init state.
The table below combines the two lists above to show what
delay is used, depending on the current state of the chip
and the command that is issued by the reader. In the State
Transition Diagram, shown on the next page, the same
information is shown graphically in a state diagram for the
chip.
Delay Length for Commands
Command
Selected
Unselected
Quiet
Set Block Address Latch
Long
Infinite
Quiet
Set Page Address Latch
Write Page P in Block BL
Long
Three (1)
Infinite
Infinite
Quiet
Quiet
Read Page P in Block BL
Write Word W, Page PL
Three
Three (1)
Infinite
Infinite
Quiet
Quiet
Read Word W, Page PL
Three
Infinite
Quiet
Global Write Word W
Set EEPROM Tamper Latch
Long
Long(1)
Infinite
Infinite
Quiet
Quiet
Global Set Tamper Latch
Long
Infinite
Quiet
Disable Chip/Set QUIET bit
Quiet
Random
Quiet
Global Reset QUIET bit
Random
Random
Random
Note: 1. After the data for a write is sent to the device, there will be a delay of TWD or TTWD. The written data will be read back to the
reader and then the ‘three bit’ window will occur. During this delay, the device ignores all data sent to it.
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AT24RF08C
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