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CAT24FC17UETE13REV-F 데이터시트(PDF) 5 Page - Catalyst Semiconductor

부품명 CAT24FC17UETE13REV-F
상세설명  16-kb I2C Serial EEPROM
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제조업체  CATALYST [Catalyst Semiconductor]
홈페이지  http://www.catalyst-semiconductor.com
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CAT24FC17
5
Doc No. 1077, Rev. F
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
I2C BUS PROTOCOL
The following defines the features of the I2C bus proto-
col:
(1) Data transfer may be initiated only when the bus is
not busy.
(2) During a data transfer, the data line must remain
stable whenever the clock line is high. Any changes
in the data line while the clock line is high will be
interpreted as a START or STOP condition.
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 CAT24FC17 monitor 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.
DEVICE ADDRESSING
The Master begins a transmission by sending a START
condition. The Master then sends the address of the
particular slave device it is requesting. The four most
significant bits of the 8-bit slave address are fixed as
1010 for the CAT24FC17 (see Fig. 5). The next three
significant bits (A10, A9, A8) are the memory array
address bits. The last bit of the slave address specifies
whether a Read or Write operation is to be performed.
When this bit is set to 1, a Read operation is selected,
and when set to 0, a Write operation is selected.
After the Master sends a START condition and the slave
address byte, the CAT24FC17 monitors the bus and
responds with an acknowledge (on the SDA line) when
its address matches the transmitted slave address. The
CAT24FC17 then performs a Read or a Write operation
depending on the state of the R/
W bit.
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 CAT24FC17 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
byte.
When the CAT24FC17 begins a READ mode, it trans-
mits 8 bits of data, releases the SDA line, and monitors
the line for an acknowledge. Once it receives this ac-
knowledge, the CAT24FC17 will continue to transmit
data. If no acknowledge is sent by the Master, the device
terminates data transmission and waits for a STOP
condition.
Figure 4. Acknowledge Timing
Figure 5. Slave Address Bits
ACKNOWLEDGE
1
START
SCL FROM
MASTER
89
DATA OUTPUT
FROM TRANSMITTER
DATA OUTPUT
FROM RECEIVER
1
DEVICE ADDRESS
0
1
0
A10
A9
A8
R/W
Normal Read and Write


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