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CAT24WC08 Scheda tecnica(PDF) 7 Page - Catalyst Semiconductor

Il numero della parte CAT24WC08
Spiegazioni elettronici  1K/2K/4K/8K/16K-Bit Serial EEPROM
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Produttore elettronici  CATALYST [Catalyst Semiconductor]
Homepage  http://www.catalyst-semiconductor.com
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CAT24WC01/02/04/08/16
7
Doc. No. 1022, Rev. N
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
24WCXX F09
Figure 7. Page Write Timing
5020 FHD F08
Figure 6. Byte Write Timing
*
P=7 for CAT24WC01 and P=15 for CAT24WC02/04/08/16
* = Don't care for CAT24WC01
BUS ACTIVITY:
MASTER
SDA LINE
DATA n+P
BYTE
ADDRESS (n)
A
C
K
A
C
K
DATA n
A
C
K
S
T
O
P
S
A
C
K
DATA n+1
A
C
K
S
T
A
R
T
P
SLAVE
ADDRESS
NOTE: IN THIS EXAMPLE n = XXXX 0000(B); X = 1 or 0
*
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 entire memory array is
protected and becomes read only. The CAT24WC01/
02/04/08/16 will accept both slave and byte addresses,
but the memory location accessed is protected from
programming by the device’s failure to send an
acknowledge after the first byte of data is received.
READ OPERATIONS
The READ operation for the CAT24WC01/02/04/08/16
is initiated in the same manner as the write operation
with the one exception that the R/
W bit is set to a one.
Three different READ operations are possible: Immediate
Address READ, Selective READ and Sequential READ.
Immediate Address Read
The CAT24WC01/02/04/08/16’s address counter
contains the address of the last byte accessed,
incremented by one. In other words, if the last READ or
WRITE access was to address N, the READ immediately
following would access data from address N+1. If N=E
(where E = 255 for 24WC02, 511 for 24WC04, 1023 for
24WC08, and 2047 for 24WC16), then the counter will
'wrap around' to address 0 and continue to clock out
data. If N = E (where E = 127 for the CAT24WC01) the
counter will not 'wrap around'.
BYTE
ADDRESS
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
the Master is allowed to send up to fifteen additional
bytes. After each byte has been transmitted the
CAT24WC01/02/04/08/16 will respond with an
acknowledge, and internally increment the low order
address bits by one. The high order bits remain
unchanged.
If the Master transmits more than sixteen bytes prior to
sending the STOP condition, the address counter ‘wraps
around’, 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
programming cycle begins. At this point all received data
is written to the CAT24WC01/02/04/08/16 in a single
write cycle.
Acknowledge Polling
The 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,
the CAT24WC01/02/04/08/16 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 the CAT24WC01/02/04/
08/16 is still busy with the write operation, no ACK will be
returned. If the CAT24WC01/02/04/08/16 has completed
the write operation, an ACK will be returned and the host
can then proceed with the next read or write operation.


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