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CAT24AA16TDI-T10 데이터시트(PDF) 5 Page - ON Semiconductor

부품명 CAT24AA16TDI-T10
상세설명  16-Kb I2C CMOS Serial EEPROM
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제조업체  ONSEMI [ON Semiconductor]
홈페이지  http://www.onsemi.com
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CAT24AA16TDI-T10 데이터시트(HTML) 5 Page - ON Semiconductor

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CAT24AA16
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5
18
9
START
SCL FROM
MASTER
BUS RELEASE DELAY (TRANSMITTER)
BUS RELEASE DELAY
(RECEIVER)
DATA OUTPUT
FROM TRANSMITTER
DATA OUTPUT
FROM RECEIVER
ACK DELAY (v tAA)
ACK SETUP (w tSU:DAT)
Figure 4. Acknowledge Timing
tHIGH
SCL
SDA IN
SDA OUT
tLOW
tF
tLOW
tR
tBUF
tSU:STO
tSU:DAT
tHD:DAT
tHD:STA
tSU:STA
tAA
tDH
Figure 5. Bus Timing
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 CAT24AA16 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 CAT24AA16 is still busy
with the write operation, NoACK will be returned. If the
CAT24AA16 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 CAT24AA16 is shipped erased, i.e., all bytes are FFh.


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