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CAT24C128ZI-GT3 датащи(PDF) 7 Page - ON Semiconductor

номер детали CAT24C128ZI-GT3
подробное описание детали  128 kb I2C CMOS Serial
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производитель  ONSEMI [ON Semiconductor]
домашняя страница  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CAT24C128ZI-GT3 датащи(HTML) 7 Page - ON Semiconductor

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CAT24C128
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7
Write Operations
Byte Write
Upon receiving a Slave address with the R/W bit set to ‘0’,
the CAT24C128 will interpret the next two bytes as address
bytes. These bytes are used to initialize the internal address
counter; the 2 most significant bits are ‘don’t care’, the next
8 point to one of 256 available pages and the last 6 point to
a location within a 64 byte page. A byte following the
address bytes will be interpreted as data. The data will be
loaded into the Page Write Buffer and will eventually be
written to memory at the address specified by the 14 active
address bits provided earlier. The CAT24C128 will
acknowledge the Slave address, address bytes and data byte.
The Master then starts the internal Write cycle by issuing a
STOP condition (Figure 6). During the internal Write cycle
(tWR), the SDA output will be tri−stated and additional Read
or Write requests will be ignored (Figure 7).
Page Write
By continuing to load data into the Page Write Buffer after
the 1st data byte and before issuing the STOP condition, up
to 64 bytes can be written simultaneously during one
internal Write cycle (Figure 8). If more data bytes are loaded
than locations available to the end of page, then loading will
continue from the beginning of page, i.e. the page address is
latched and the address count automatically increments to
and then wraps−around at the page boundary. Previously
loaded data can thus be overwritten by new data. What is
eventually written to memory reflects the latest Page Write
Buffer contents. Only data loaded within the most recent
Page Write sequence will be written to memory.
Acknowledge Polling
The ready/busy status of the CAT24C128 can be
ascertained by sending Read or Write requests immediately
following the STOP condition that initiated the internal
Write cycle. As long as internal Write is in progress, the
CAT24C128 will not acknowledge the Slave address.
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 operation of
the CAT24C128. The state of the WP pin is strobed on the
last falling edge of SCL immediately preceding the first data
byte (Figure 9). If the WP pin is HIGH during the strobe
interval, the CAT24C128 will not acknowledge the data byte
and the Write request will be rejected.
Delivery State
The CAT24C128 is shipped erased, i.e., all bytes are FFh.
SLAVE
ADDRESS
S
A
C
K
A
C
K
A
C
K
S
T
O
P
P
BUS ACTIVITY:
MASTER
SLAVE
S
T
A
R
T
ADDRESS
BYTE
ADDRESS
BYTE
DATA
BYTE
A
C
K
* = Don’t Care Bit
Figure 6. Byte Write Sequence
**
a13−a8
a7−a0
STOP
CONDITION
START
CONDITION
ADDRESS
ACK
8th Bit
Byte n
SCL
SDA
Figure 7. Write Cycle Timing
tWR


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