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CAT24FC66UE-1.8TE13 Fiches technique(PDF) 5 Page - Catalyst Semiconductor

No de pièce CAT24FC66UE-1.8TE13
Description  64K-Bit I2C Serial CMOS EEPROM with Partial Array Write Protection
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Fabricant  CATALYST [Catalyst Semiconductor]
Site Internet  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT24FC66UE-1.8TE13 Fiches technique(HTML) 5 Page - Catalyst Semiconductor

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CAT24FC65/66
5
Doc No. 1047, Rev. H
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
The features of the I2C bus protocol are defined as
follows:
(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 CAT24FC65/66 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.
DEVICE ADDRESSING
The bus Master begins a transmission by sending a
START condition. The Master 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 (Fig. 5). The CAT24FC65/66 uses the next three
bits as address bits. The address bits A2, A1 and A0
Figure 4. Acknowledge Timing
Figure 5. Slave Address Bits
ACKNOWLEDGE
1
START
SCL FROM
MASTER
89
DATA OUTPUT
FROM TRANSMITTER
DATA OUTPUT
FROM RECEIVER
allow as many as eight devices on the same bus. These
bits must compare to their hardwired input pins. 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 CAT24FC65/66 monitors the bus and
responds with an acknowledge (on the SDA line) when
its address matches the transmitted slave address. The
CAT24FC65/66 then performs a Read or 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
Acknowledging device pulls down the SDA line during
the ninth clock cycle, signaling that it received the 8 bits
of data.
The CAT24FC65/66 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 CAT24FC65/66 begins a READ mode it
transmits 8 bits of data, releases the SDA line, and
monitors the line for an acknowledge. Once it receives
this acknowledge, the CAT24FC65/66 will continue to
I2C BUS PROTOCOL
1
0
1
0
A2
A1
A0
R/W


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