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CAT24C0A1UETE13 データシート(PDF) 5 Page - Catalyst Semiconductor

部品番号 CAT24C0A1UETE13
部品情報  1K-Bit Serial EEPROM
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メーカー  CATALYST [Catalyst Semiconductor]
ホームページ  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT24C0A1UETE13 データシート(HTML) 5 Page - Catalyst Semiconductor

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Discontinued
Part
CAT24C01B
5
Doc. No. 1081, Rev. E
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
START Condition
The START Condition precedes all commands to the
device, and is defined as a HIGH to LOW transition of
SDA when SCL is HIGH. The CAT24C01B monitors the
SDA and SCL lines and will not respond until this
condition is met.
STOP Condition
A LOW to HIGH transition of SDA when SCL is HIGH
determines the STOP condition. All operations must end
with a STOP condition.
Acknowledge
After a successful data transfer, each receiving device is
required to generate an acknowledge. The Acknowledg-
ing device pulls down the SDA line during the ninth clock
cycle, signaling that it received the 8 bits of data.
The CAT24C01B responds with an acknowledge after
receiving a START condition and its slave address. If the
device has been selected along with a write operation,
it responds with an acknowledge after receiving each 8-
bit byte.
When the CAT24C01B is in a READ mode it transmits
8 bits of data, releases the SDA line, and monitors the
line for an acknowledge. Once it receives this acknowl-
edge, the CAT24C01B will continue to transmit data. If
no acknowledge is sent by the Master, the device
terminates data transmission and waits for a STOP
condition.
WRITE OPERATIONS
Byte Write
In the Byte Write mode, the Master device sends the
START condition and the slave address information
(with the R/
W bit set to zero) to the Slave device. After the
Slave generates an acknowledge, the Master sends the
byte address that is to be written into the address pointer
of the CAT24C01B. After receiving another acknowl-
edge from the Slave, the Master device transmits the
data byte to be written into the addressed memory
location. The CAT24C01B acknowledge once more and
the Master generates the STOP condition, at which time
the device begins its internal programming cycle to
nonvolatile memory. While this internal cycle is in
progress, the device will not respond to any request from
the Master device.
Page Write
The CAT24C01B writes up to 4 bytes of data in a single
write cycle, using the Page Write operation. The Page
Write operation is initiated in the same manner as the
Byte Write operation, however instead of terminating
after the initial word is transmitted, the Master is allowed
to send up to 3 additional bytes. After each byte has been
transmitted the CAT24C01B will respond with an ac-
knowledge, and internally increment the low order ad-
dress bits by one. The high order bits remain un-
changed.
If the Master transmits more than 4 bytes prior to sending
the STOP condition, the address counter ‘wraps around,’
and previously transmitted data will be overwritten.
Once all 4 bytes are received and the STOP condition
has been sent by the Master, the internal programming
cycle begins. At this point all received data is written to
the CAT24C01B in a single write cycle.
Note: Catalyst Semiconductor does program all "1" data
into the entire memory array prior to shipping our
EEPROM products.
Figure 4. Acknowledge Timing
5020 FHD F06
ACKNOWLEDGE
1
START
SCL FROM
MASTER
89
DATA OUTPUT
FROM TRANSMITTER
DATA OUTPUT
FROM RECEIVER


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