M24LR04E-RDW6T/2 STMicroelectronics, M24LR04E-RDW6T/2 Datasheet - Page 75
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M24LR04E-RDW6T/2
Manufacturer Part Number
M24LR04E-RDW6T/2
Description
EEPROM 4-Kbit Dual EEPROM 1.8 to 5.5V 13.56Mhz
Manufacturer
STMicroelectronics
Datasheet
1.M24LR04E-RDW6T2.pdf
(142 pages)
Specifications of M24LR04E-RDW6T/2
Product Category
EEPROM
Memory Size
4 Kbit
Maximum Clock Frequency
400 KHz
Maximum Operating Current
20 uA
Operating Supply Voltage
1.8 V to 5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
TSSOP-8
Factory Pack Quantity
1
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
M24LR04E-RDW6T/2
Manufacturer:
ST
Quantity:
20 000
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M24LR04E-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. It could have
continued to send EOFs until Slot 16 and only then sent the request to M24LR04E-R_1.
The VCD sends an Inventory request, in a frame terminated by an EOF. The number of
slots is 16.
M24LR04E-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 M24LR04E-Rs, M24LR04E-R_2 and M24LR04E-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 M24LR04E-R transmits a response. Therefore the VCD does not detect
any M24LR04E-R SOF and switches to the next slot by sending an EOF.
In Slot 3, another collision occurs due to responses from M24LR04E-R_4 and
M24LR04E-R_5.
The VCD sends a request (for instance a Read Block) to M24LR04E-R_1 whose UID
has already been correctly received.
All M24LR04E-Rs detect an SOF and exit the anticollision sequence. They process this
request and since the request is addressed to M24LR04E-R_1, only M24LR04E-R_1
transmits a response.
All M24LR04E-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 022208 Rev 5
Explanation of the possible cases
75/142
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