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CAT24C03VP2I-T 数据表(PDF) 6 Page - Catalyst Semiconductor

部件名 CAT24C03VP2I-T
功能描述  2-Kb and 4-Kb I2C Serial EEPROM with Partial Array Write Protection
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制造商  CATALYST [Catalyst Semiconductor]
网页  http://www.catalyst-semiconductor.com
标志 CATALYST - Catalyst Semiconductor

CAT24C03VP2I-T 数据表(HTML) 6 Page - Catalyst Semiconductor

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CAT24C03/05
6
Doc. No. 1116, Rev. B
© 2006 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
WRITE OPERATIONS
Byte Write
In Byte Write mode, the Master sends the START condi-
tion and the Slave address with the R/W bit set to zero
to the Slave. After the Slave generates an acknowledge,
the Master sends the byte address that is to be written
into the address pointer of the CAT24C03/05. After re-
ceiving another acknowledge from the Slave, the Master
transmits the data byte to be written into the addressed
memory location.The CAT24C03/05 device will acknowl-
edge the data byte and the Master generates the STOP
condition, at which time the device begins its internal
Write cycle to nonvolatile memory (Figure 5). While this
internal cycle is in progress (tWR), the SDA output will be
tri-stated and the CAT24C03/05 will not respond to any
request from the Master device (Figure 6).
Page Write
The CAT24C03/05 writes up to 16 bytes of data in a
single write cycle, using the Page Write operation (Fig-
ure 7). The Page Write operation is initiated in the same
manner as the Byte Write operation, however instead of
terminating after the data byte is transmitted, the Master
is allowed to send up to fifteen additional bytes. After
each byte has been transmitted the CAT24C03/05 will
respond with an acknowledge and internally increments
the four low order address bits. The high order bits that
define the page address remain unchanged. If the Master
transmits more than sixteen bytes prior to sending the
STOP condition, the address counter ‘wraps around’ to
the beginning of page and previously transmitted data
will be overwritten. Once all sixteen bytes are received
and the STOP condition has been sent by the Master, the
internal Write cycle begins. At this point all received data
is written to the CAT24C03/05 in a single write cycle.
Acknowledge Polling
The acknowledge (ACK) polling routine 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, the CAT24C03/05 initiates the
internal write cycle. The ACK polling can be initiated
immediately. This involves issuing the start condition
followed by the slave address for a write operation.
If the CAT24C03/05 is still busy with the write opera-
tion, NoACK will be returned. If the CAT24C03/05 has
completed the internal write operation, an ACK will be
returned and the host can then proceed with the next
read or write operation.
Hardware Write Protection
With the WP pin held HIGH, the upper half of memory
is protected against Write operations. If the WP pin is
left floating or is grounded, it has no impact on the op-
eration of the CAT24C03/05. The state of the WP pin
is strobed on the last falling edge of SCL immediately
preceding the first data byte (Figure 8). If the WP pin is
HIGH during the strobe interval, the CAT24C03/05 will
not acknowledge the data byte and the Write request
will be rejected.
Delivery State
The CAT24C03/05 is shipped erased, i.e., all bytes are
FFh.


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