M24LR64E-RDW6T/2 STMicroelectronics, M24LR64E-RDW6T/2 Datasheet - Page 77
M24LR64E-RDW6T/2
Manufacturer Part Number
M24LR64E-RDW6T/2
Description
EEPROM 64Kbit EEProm 400kHz 13.56Mhz 1.8 to 5.5V
Manufacturer
STMicroelectronics
Datasheet
1.M24LR64E-RDW6T2.pdf
(140 pages)
Specifications of M24LR64E-RDW6T/2
Rohs
yes
Memory Size
64 Kbit
Organization
8192 x 8
Data Retention
40 yr
Maximum Clock Frequency
400 kHz
Maximum Operating Current
20 uA
Operating Supply Voltage
1.8 V to 5.5 V
Maximum Operating Temperature
+ 90 C
Mounting Style
SMD/SMT
Package / Case
TSSOP-8
Access Time
900 ns
Interface Type
I2C
Minimum Operating Temperature
0 C
Operating Current
20 uA
Supply Voltage - Max
5.5 V
Supply Voltage - Min
1.8 V
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M24LR64E-R
24
Inventory Initiated command
The M24LR64E-R provides a special feature to improve the inventory time response of
moving tags using the Initiate_flag value. This flag, controlled by the Initiate command,
allows tags to answer Inventory Initiated commands.
For applications in which multiple tags are moving in front of a reader, it is possible to miss
tags using the standard inventory command. The reason is that the inventory sequence has
to be performed on a global tree search. For example, a tag with a particular UID value may
have to wait the run of a long tree search before being inventoried. If the delay is too long,
the tag may be out of the field before it has been detected.
Using the Initiate command, the inventory sequence is optimized. When multiple tags are
moving in front of a reader, the ones which are within the reader field are initiated by the
Initiate command. In this case, a small batch of tags answers to the Inventory Initiated
command, which optimizes the time necessary to identify all the tags. When finished, the
reader has to issue a new Initiate command in order to initiate a new small batch of tags
which are new inside the reader field.
It is also possible to reduce the inventory sequence time using the Fast Initiate and Fast
Inventory Initiated commands. These commands allow the M24LR64E-Rs to increase their
response data rate by a factor of 2, up to 53 Kbit/s.
Doc ID 022712 Rev 3
Inventory Initiated command
77/140
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