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CAT24WC66XE-TE13 датащи(PDF) 6 Page - Catalyst Semiconductor

номер детали CAT24WC66XE-TE13
подробное описание детали  64K-Bit I2C Serial CMOS EEPROM
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производитель  CATALYST [Catalyst Semiconductor]
домашняя страница  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT24WC66XE-TE13 датащи(HTML) 6 Page - Catalyst Semiconductor

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CAT24WC66
6
Doc. No. 1037, Rev. H
A15–A8
SLAVE
ADDRESS
S
A
C
K
A
C
K
A
C
K
BUS ACTIVITY:
MASTER
SDA LINE
S
T
A
R
T
A7–A0
BYTE ADDRESS
DATA n+31
DATA
A
C
K
S
T
O
P
A
C
K
DATA n
A
C
K
P
A
C
K
*
X
XX
A15–A8
SLAVE
ADDRESS
S
A
C
K
A
C
K
DATA
A
C
K
S
T
O
P
P
BUS ACTIVITY:
MASTER
SDA LINE
S
T
A
R
T
A7–A0
BYTE ADDRESS
A
C
K
*
X
XX
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
two 8-bit address words that are to be written into the
address pointers of the CAT24WC66. After receiving
another acknowledge from the Slave, the Master device
transmits the data to be written into the addressed
memory location. The CAT24WC66 acknowledges once
more and the Master generates the STOP condition. At
this time, the device begins an internal programming
cycle to nonvolatile memory. While the cycle is in
progress, the device will not respond to any request from
the Master device.
Page Write
The CAT24WC66 writes up to 32 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 byte is transmitted, the Master is allowed
to send up to 31 additional bytes. After each byte has
been transmitted, CAT24WC66 will respond with an
acknowledge, and internally increment the five low order
address bits by one. The high order bits remain
unchanged.
If the Master transmits more than 32 bytes before sending
the STOP condition, the address counter ‘wraps around’,
and previously transmitted data will be overwritten.
When all 32 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 CAT24WC66 in a single write cycle.
Acknowledge Polling
Disabling of the inputs 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,
CAT24WC66 initiates the internal write cycle. ACK
polling can be initiated immediately. This involves issuing
the start condition followed by the slave address for a
write operation. If CAT24WC66 is still busy with the write
operation,
no
ACK
will
be
returned.
If
CAT24WC66 has completed the write operation, an
ACK will be returned and the host can then proceed with
the next read or write operation.
WRITE PROTECTION
The Write Protection feature allows the user to protect
against inadvertent programming of the memory array.
If the WP pin is tied to VCC, the top 1/4 of the memory
array (locations 1800H to 1FFF) is protected and
Figure 7. Page Write Timing
Figure 6. Byte Write Timing
* = Don't care bit for 24WC33
X= Don't care bit


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