M24LR64E-RDW6T/2 STMicroelectronics, M24LR64E-RDW6T/2 Datasheet - Page 75

• Manufacturer Part Number: M24LR64E-RDW6T/2
• Description: EEPROM 64Kbit EEProm 400kHz 13.56Mhz 1.8 to 5.5V
• Manufacturer: STMicroelectronics

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

M24LR64E-R
23
Note:
Explanation of the possible cases
Figure 51
sequence when the number of slots is 16.
The sequence of steps is as follows:
The decision to interrupt the anticollision sequence is made by the VCD. EOFs could have
been sent until Slot 16, and the request to M24LR64E-R_1 sent then.
The VCD sends an Inventory request, in a frame terminated by an EOF. The number of
slots is 16.
M24LR64E-R_1 transmits its response in Slot 0. It is the only one to do so, therefore no
collision occurs and its UID is received and registered by the VCD.
The VCD sends an EOF in order to switch to the next slot.
In Slot 1, two M24LR64E-Rs (M24LR64E-R_2 and M24LR64E-R_3) transmit a
response, thus generating a collision. The VCD records the event and registers that a
collision was detected in Slot 1.
The VCD sends an EOF in order to switch to the next slot.
In Slot 2, no M24LR64E-R transmits a response. Therefore the VCD does not detect
any M24LR64E-R SOF and switches to the next slot by sending an EOF.
In Slot 3, another collision occurs due to responses from M24LR64E-R_4 and
M24LR64E-R_5.
The VCD sends a request (for instance a Read Block) to M24LR64E-R_1 whose UID
has already been correctly received.
All M24LR64E-Rs detect an SOF and exit the anticollision sequence. They process this
request and since the request is addressed to M24LR64E-R_1, only M24LR64E-R_1
transmits a response.
All M24LR64E-Rs are ready to receive another request. If it is an Inventory command,
the slot numbering sequence restarts from 0.
summarizes the main possible cases that can occur during an anticollision
Doc ID 022712 Rev 3
Explanation of the possible cases
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