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CAT24AA08TDI-GT10 Fiches technique(PDF) 5 Page - ON Semiconductor

No de pièce CAT24AA08TDI-GT10
Description  4-Kb and 8-Kb I2C CMOS Serial EEPROM
Download  10 Pages
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Fabricant  ONSEMI [ON Semiconductor]
Site Internet  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CAT24AA08TDI-GT10 Fiches technique(HTML) 5 Page - ON Semiconductor

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CAT24AA04, CAT24AA08
http://onsemi.com
5
Figure 4. Acknowledge Timing
18
9
START
SCL FROM
MASTER
BUS RELEASE DELAY (TRANSMITTER)
BUS RELEASE DELAY (RECEIVER)
DATA OUTPUT
FROM TRANSMITTER
DATA OUTPUT
FROM RECEIVER
ACK SETUP (≥ tSU:DAT)
ACK DELAY (≤ tAA)
Figure 5. Bus Timing
SCL
SDA IN
SDA OUT
tBUF
tSU:STO
tSU:DAT
tR
tAA
tDH
tLOW
tHIGH
tLOW
tSU:STA
tHD:STA
tHD:DAT
tF
WRITE OPERATIONS
Byte Write
To write data to memory, the Master creates a START
condition on the bus and then broadcasts a Slave address
with the R/W bit set to ‘0’. The Master then sends an address
byte and a data byte and concludes the session by creating
a STOP condition on the bus. The Slave responds with ACK
after every byte sent by the Master (Figure 6). The STOP
starts the internal Write cycle, and while this operation is in
progress (tWR), the SDA output is tri−stated and the Slave
does not acknowledge the Master (Figure 7).
Page Write
The Byte Write operation can be expanded to Page Write,
by sending more than one data byte to the Slave before
issuing the STOP condition (Figure 8). Up to 16 distinct data
bytes can be loaded into the internal Page Write Buffer
starting at the address provided by the Master. The page
address is latched, and as long as the Master keeps sending
data, the internal byte address is incremented up to the end
of page, where it then wraps around (within the page). New
data can therefore replace data loaded earlier. Following the
STOP, data loaded during the Page Write session will be
written to memory in a single internal Write cycle (tWR).
Acknowledge Polling
The acknowledge (ACK) polling routine can be used to
take advantage of the typical write cycle time. Once the stop
condition is issued to indicate the end of the host’s write
operation, the CAT24AA04/08 initiates the internal write
cycle. The ACK polling can be initiated immediately. This
involves issuing the start condition followed by the slave
address for a write operation. If the CAT24AA04/08 is still
busy with the write operation, NoACK will be returned. If
the CAT24AA04/08 device has completed the internal write
operation, an ACK will be returned and the host can then
proceed with the next read or write operation.
Hardware Write Protection
With the WP pin held HIGH, the entire memory is
protected against Write operations. If the WP pin is left
floating or is grounded, it has no impact on the Write
operation. The state of the WP pin is strobed on the last
falling edge of SCL immediately preceding the 1st data byte
(Figure 9). If the WP pin is HIGH during the strobe interval,
the Slave will not acknowledge the data byte and the Write
request will be rejected.
Delivery State
The CAT24AA04/08 is shipped erased, i.e., all bytes are FFh.


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